ADVANCED SUBSIDIARY GCE GEOLOGY F792 - ocr.org.uk · 5 The diagram below shows part of Bowen’s...
20
ADVANCED SUBSIDIARY GCE GEOLOGY F792 Rocks – Processes and Products *OCE/11038* INSTRUCTIONS TO CANDIDATES • Write your name clearly in capital letters, your Centre Number and Candidate Number in the boxes above. • Use black ink.Pencil may be used for graphs and diagrams only. • Read each question carefully and make sure that you know what you have to do before starting your answer. • Answer all the questions. • Do not write in the bar codes. • Write your answer to each question in the space provided, however additional paper may be used if necessary. INFORMATION FOR CANDIDATES • The number of marks is given in brackets [ ] at the end of each question or part question. • The total number of marks for this paper is 100. • Where you see this icon you will be awarded marks for the quality of written communication in your answer. • You may use an electronic calculator. • You are advised to show all the steps in any calculations. • This document consists of 20 pages. Any blank pages are indicated. * F 7 9 2 * OCR is an exempt Charity Turn over © OCR 2009 [H/500/8417] DC (SJF4962/DR) 11038/9 Candidates answer on the question paper OCR Supplied Materials: None Other Materials Required: • Electronic Calculator • Ruler (cm/mm) Wednesday 20 May 2009 Afternoon Duration: 1 hour 45 minutes THIS IS A NEW SPECIFICATION FOR EXAMINER’S USE Qu. Max. Mark 1 14 2 14 3 17 4 19 5 16 6 10 7 10 TOTAL 100
Transcript of ADVANCED SUBSIDIARY GCE GEOLOGY F792 - ocr.org.uk · 5 The diagram below shows part of Bowen’s...
ADVANCED SUBSIDIARY GCE
GEOLOGY F792Rocks – Processes and Products
*OCE/11038*
INSTRUCTIONS TO CANDIDATES
• Writeyournameclearlyincapitalletters,yourCentreNumberandCandidateNumberintheboxesabove.• Useblackink.Pencilmaybeusedforgraphsanddiagramsonly.• Readeachquestioncarefullyandmakesurethatyouknowwhatyouhavetodobeforestartingyouranswer.• Answerallthequestions.• Donotwriteinthebarcodes.• Writeyouranswertoeachquestioninthespaceprovided,howeveradditionalpapermaybeusedif
necessary.
INFORMATION FOR CANDIDATES
• Thenumberofmarksisgiveninbrackets[ ]attheendofeachquestionorpartquestion.
• Thetotalnumberofmarksforthispaperis100.• Where you see this icon you will be awarded marks for the
quality of written communication in your answer.• Youmayuseanelectroniccalculator.• Youareadvisedtoshowallthestepsinanycalculations.• Thisdocumentconsistsof20pages.Anyblankpagesareindicated.
* F 7 9 2 *
OCRisanexemptCharityTurn over
©OCR2009 [H/500/8417]DC(SJF4962/DR)11038/9
Candidatesansweronthequestionpaper
OCR Supplied Materials:None
Other Materials Required:• ElectronicCalculator• Ruler(cm/mm)
Wednesday 20 May 2009Afternoon
Duration:1hour45minutes
THIS IS A NEW SPECIFICATION
FOR EXAMINER’S USE
Qu. Max. Mark
1 14
2 14
3 17
4 19
5 16
6 10
7 10
TOTAL 100
2
©OCR2009
Answerallthequestions.
1 (a) CompletetheflowdiagrambelowbyenteringthenamesofthecorrectbroadrockgroupsinboxesA,B,C and D.
texture
clasticcrystalline
alignmentofminerals
yes no
yes no
A
B
C D
composedmainlyofcalciteorquartz
[3]
(b) (i) Definetheterms
clastic ................................................................................................................................
...........................................................................................................................................
crystalline ..........................................................................................................................
...................................................................................................................................... [2]
(ii) Definethetermrock.
...........................................................................................................................................
...................................................................................................................................... [1]
3
Turn over©OCR2009
(iii) Explaintheprocessesthatcausemineralstobealignedinmetamorphicrocks.
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
...................................................................................................................................... [2]
(c) Belowarethinsectiondiagramsoftworocks.
10mm 1mm
fine grainedcalcite cement
groundmass of maficminerals and plagioclase
feldspar
plagioclasefeldspar
E F
(i) Circlethebroadrockgrouptowhicheachrockbelongs.
E igneous metamorphic sedimentary
F igneous metamorphic sedimentary [2]
(ii) GivetworeasonsforyourchoiceforE.
1........................................................................................................................................
...........................................................................................................................................
2........................................................................................................................................
...................................................................................................................................... [2]
(iii) GivetworeasonsforyourchoiceforF.
1........................................................................................................................................
...........................................................................................................................................
2........................................................................................................................................
...................................................................................................................................... [2]
[Total: 14]
4
©OCR2009
2 (a) Thediagrambelowshowsdifferenttypesofsedimenttransport.
current direction
river bed
water surface
suspension
keysand grain
pebbles
(i) Definethetermsuspension.
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
...................................................................................................................................... [2]
(ii) Explainwhythesamegraincanbetransportedbysuspensionandbysaltationatdifferenttimes.
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
...................................................................................................................................... [2]
(iii) Describeandexplainonedifferencebetweengrainstransportedbyiceandbywind.
difference...........................................................................................................................
...........................................................................................................................................
reason ...............................................................................................................................
...................................................................................................................................... [2]
5
Turn over©OCR2009
(b) Thediagrambelowshowssedimentsdepositedbyameanderingriver.
0 10metres
river
mudsandgravel
2 1
N
(i) Labelonthediagramwheresedimentisbeingeroded. [1]
(ii) List two sedimentary structures that will be found in the meandering river depositsshown.
...........................................................................................................................................
...................................................................................................................................... [2]
(iii) Explainwhythesedimentat1 isolderthanthesedimentat2.
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
...................................................................................................................................... [2]
(c) Thesequenceofsedimentsshownonthediagramisa finingup sequence.Explainhowitformed.
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
.............................................................................................................................................. [3]
[Total: 14]
6
©OCR2009
3 ThegraphbelowshowsthecumulativefrequencycurveforsedimentG.ThetableshowsthegrainsizedistributionforsedimentH.
grainsize
(phiφ)
mass(%)
cumulativemass(%)
0 0
1 2
2 14
3 78
4 6
5 0
6 0
sediment H
(a) (i) Usingthedata• completethetabletoshowthecumulativemass%forsedimentH.• plotthedataonthegraph• drawthecumulativefrequencycurve. [3]
(ii) Definethetermsorting.
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
...................................................................................................................................... [2]
-3 -2 -1 0 1 2 3 4 5 60
20
40
60
80
100
grain size (phi units)
cumulativemass (%)
sediment G
7
Turn over©OCR2009
(iii) Usingthecumulativefrequencycurvesandtheinformationbelow,calculatethecoefficientofsortingforsedimentsG and H. Showyourworking.
coefficientofsorting= φ 84–φ16
2
(Whereφ 84isthegrainsizeofthecumulativemassof84%ofthesampleandφ16isthegrainsizeofthecumulativemassof16%ofthesample.)
coefficientofsortingG=...........................coefficientofsortingH=....................... [3]
coefficientofsorting description
<0.50 wellsorted
0.50–1.00 moderatelysorted
>1.00 poorlysorted
(iv) DescribethedifferenceinsortingbetweensedimentGandsedimentH.
...........................................................................................................................................
...................................................................................................................................... [1]
(v) IdentifypossibleenvironmentsinwhichsedimentsG and H wereformed.
G .......................................................................................................................................
H ................................................................................................................................... [2]
8
©OCR2009
(b) Sandstonescanbeclassifiedusingcompositionandgrainshape.Thethinsectiondiagramsbelowshowthreedifferentsandstones.
0 1mm
sandstone J sandstone K sandstone L
quartz quartz quartz
calcitecement
ironoxidecement
rockfragments
matrixfeldspar
(i) Identify sandstone J. Use the characteristics shown in the diagram to explain theenvironmentinwhichJwasdeposited.
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
...................................................................................................................................... [2]
(ii) UsethecharacteristicsshowninthediagramtoexplainwhysandstoneK wasdepositedinthesea.
...........................................................................................................................................
...................................................................................................................................... [1]
(iii) Compare the grain shape of sandstones K and L and explain how this is used todeterminethedegreeoftransport.
...........................................................................................................................................
...................................................................................................................................... [1]
(iv) Analyse the characteristics shown in the diagram to determine the environment ofdepositionofsandstoneL.
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
...................................................................................................................................... [2]
[Total: 17]
9
Turn over©OCR2009
4 Thediagrambelowshowsasequenceofprocessesthatoperateintherockcycle.
burial diagenesis
partialmelting
intrusion uplift
(a) (i) Completethesequencebyenteringthenameofthecorrectprocessineachboxabove. Choosefromthelistbelow.
crystallisationmagma accumulation
metamorphismrecrystallisation
transport [4]
(ii) Describetheprocessofcompaction.
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
...................................................................................................................................... [2]
(iii) Describetheprocessofcementation.
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
...................................................................................................................................... [2]
10
©OCR2009
(b) The diagram below shows zones of metamorphic rocks around a granite intruded intoshales.
0 500
metres
granite
edge ofmetamorphic
aureole1
23
(i) Name and describe the characteristic rocks and index minerals found in each of thethreezones.
1........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
2........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
3........................................................................................................................................
...........................................................................................................................................
...................................................................................................................................... [6]
11
Turn over©OCR2009
(ii) Drawalabelleddiagramanddescribethemetamorphicrockproducediftheparentrockwassandstone.
0 5mm
...........................................................................................................................................
...........................................................................................................................................
...................................................................................................................................... [3]
(iii) Explainthedifferencebetweenametamorphicaureoleandabakedmargin.
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
...................................................................................................................................... [2]
[Total: 19]
12
©OCR2009
5 The diagram below shows part of Bowen’s Reaction Series. The table shows some of thecharacteristicpropertiesoftherockformingminerals.
Specific gravity
Cleavage Hardness Composition Colour Name
2.7 none 7 silicondioxideglassygreyorwhite
quartz
2.6 twogood 6Krichaluminiumsilicate
pinkorwhite Kfeldspar
2.7 twogood 6NaorCarichaluminiumsilicate
whiteorgreyplagioclasefeldspar
3oneperfectsplitsintothinelasticsheets
2.5K,Mg,Ferichaluminiumsilicate
darkbrowntoblack
biotitemica
2.8oneperfectsplitsintothinelasticsheets
2.5Krichaluminiumsilicate
palesilverymuscovitemica
3.2twogoodat120°
5.5NaorCarichaluminiumsilicate
blackorgreenishblack
hornblende(amphibole)
3.4twogoodat90°
6Ca,Mg,Ferichaluminiumsilicate
blackorgreenishblack
augite(pyroxene)
3.4 none 6.5 Mg,Alsilicate green olivine
Bowen’s Reaction Series
1
2
hornblende
biotite Narichplagioclasefeldspar
Carichplagioclasefeldspar
K feldspar
3
4
13
Turn over©OCR2009
(a) (i) Drawa labelledarrowon thediagramofBowen’sReactionSeries toshow increasingtemperature. [1]
(ii) Identifytheminerals1 – 4onBowen’sReactionSeries.Writeyouranswersintheboxesonthepreviouspage. [3]
(iii) Explainhowplagioclasefeldsparformsacontinuousreactionseries.
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
...................................................................................................................................... [2]
(b) (i) Nametwoof theminerals likelytobefoundinmafic igneousrocks.Giveareasonforeachofyouranswers.
1........................................................................................................................................
...........................................................................................................................................
2........................................................................................................................................
...................................................................................................................................... [2]
(ii) Usingthedataprovidedexplainhowyouwoulddistinguishbetweenthewhitemineralsquartzandplagioclasefeldspar.
...........................................................................................................................................
...........................................................................................................................................
...........................................................................................................................................
...................................................................................................................................... [2]
14
©OCR2009
(c) (i) Thephotographbelowisofagranite.Identifyfromthephotographthecorrectmineralsfromthedescriptionsbelow.Putthecorrectletterineachbox.
• black,withperfectcleavagethatformsflakes
• pinkphenocrystsofhardness6 [2]
M
N
P
Q
0 10 20mm
(ii) Statetwoothermineralsthatarepresentinthegranite.
1……………………………………………2…………………………………………… [1] (d) Describehow fractionalcrystallisationandgravitysettlingallowan intermediate rock tobe
formedfromamaficmagma.
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
.............................................................................................................................................. [3]
[Total: 16]
15
Turn over©OCR2009
6 Describethegradesofregionalmetamorphismandtherocksproducedateachgrade.Youmayusediagramstoillustrateyouranswer.
In your answer you should make clear how the rocks are linked to metamorphic grade.
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
16
©OCR2009
......................................................................................................................................................... .
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
................................................................................................................................................... [10]
[Total: 10]
17
Turn over©OCR2009
7 Describeandexplaintheessentialfeaturesofstrato-volcanoesandshieldvolcanoes.Youshouldusediagramstoillustrateyouranswer.
In your answer you should refer to:• magma viscosity• lava type• gas content • shape and structure of the volcanoes in your answer.
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
18
©OCR2009
..........................................................................................................................................................
......................................................................................................................................................... .
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
..........................................................................................................................................................
................................................................................................................................................... [10]
[Total: 10]
END OF QUESTION PAPER
19
©OCR2009
BLANK PAGE
PLEASE DO NOT WRITE ON THIS PAGE
20
©OCR2009
PLEASE DO NOT WRITE ON THIS PAGE
Copyright Information
OCRiscommitted toseekingpermission toreproduceall third-partycontent that ituses in itsassessmentmaterials. OCRhasattempted to identifyandcontactallcopyrightholderswhosework isused in thispaper. Toavoid the issueofdisclosureofanswer-related information tocandidates,allcopyrightacknowledgementsarereproduced in theOCRCopyrightAcknowledgementsBooklet.Thisisproducedforeachseriesofexaminations,isgiventoallschoolsthatreceiveassessmentmaterialandisfreelyavailabletodownloadfromourpublicwebsite(www.ocr.org.uk)aftertheliveexaminationseries.
If OCR has unwittingly failed to correctly acknowledge or clear any third-party content in this assessment material, OCR will be happy to correct its mistake at the earliest possibleopportunity.
ForqueriesorfurtherinformationpleasecontacttheCopyrightTeam,FirstFloor,9HillsRoad,CambridgeCB21PB.
OCR is part of the Cambridge Assessment Group; Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself adepartmentoftheUniversityofCambridge.
