ENCE MAP 2006-4 uTrP Geology of the Mahatta Creek Area...
Transcript of ENCE MAP 2006-4 uTrP Geology of the Mahatta Creek Area...
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Scale 1:50 000kilometres
MAP SYMBOLSGeological contact, defined
Geological contact, approximate
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Geoscienc
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USACanada
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Pacific Ocean
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Port Alice
Port Hardy Mahatta Creek Area92L/5
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2006-2
2006-1
Base Map Information
Base map produced from digital TRIM (Terrain Resource Inventory Management) 1:20 000-scale topographic database, British Columbia Ministry of Environment, Lands and Parks.
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y basaltic to andesitic volcanic breccia of epiclastic and pyroclastic origin, and bly reworked lithic-crystal tuff; locally includes fine-grained sedimentary interbeds
y basaltic to andesitic pillow breccias and hyaloclastite with minor intercalatedastic deposits; locally includes minor pillow lava
y sedimentary strata including impure limestone, calcareous to non-calcareousstone, shale, siltstone, sandstone and tuffaceous equivalents; may includer intercalated volcaniclastic breccia
oclase-megacrystic basaltic to andesitic lava flows; locally intercalated withnitic and plagioclase-phyric flows
bedded volcaniclastic and sedimentary strata; includes lithic and crystal-lithic tuff and reworked equivalents, pyroclastic and epiclastic volcanic breccia,
stone, siltstone, mudstone, impure limestone, and minor debris-flow and atomagmatic deposits; may include minor lava flows
d volcaniclastic and lesser sedimentary strata (predominantly submarine): -green, thin to very thickly bedded, calcareous to non-calcareous, volcanic ic and feldspathic wacke, siltstone and limestone, locally coralline; lithic-crystal
uff and reworked equivalents; and minor vitric tuff, pebbly sandstone, siltstone,clastic debris-flow deposits; organic-rich facies include carbonaceous shale,siltstone and limestone, locally coralline
ey to black, laminated to medium bedded impure limestone, calcareousareous mudstone, siltstone, and shale, locally intercalated with minor lithic wacke, feldspathic wacke, lithic, crystal and vitric tuff and reworked
d l i l ti b i d bbl d t l t d
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Bedding, facing known, inclined, vertical
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Plutonic flow lamination, inclined, vertical
Lineation, inclined (slickenfibres on fault plane)
Lineation, horizontal (slickenfibres on fault plane)
Thin (<40m) sliver of Quatsino limestone adjacent to fault
Reverse fault, inferred (teeth on upper plate)
Unconformity, approximate
Unconformity, inferred
Unconformity, defined
Reverse fault, defined (teeth on upper plate)
Radiolarian locality (age code as below)
Minor fold with dip of axial plane
Macrofossil locality (age code as below)
GSC Conodont locality (age code as below)
Conodont locality (age code as below)
TlC(W)GSC Macrofossil locality (age code as below)
Dike, inclined, vertical
Volcanic lamination/welding, inclined
Limit of mapping
Minor fold with plunge
at base of Parson Bay FormationThin (<40m) unit of Quatsino limestone
B
Steeply dipping fault, inferred
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40 ann
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MullGeo
Mulland VanCan
Magnetic Declination
NNM
proximate mean magnetic eclination 2005 for centre of map area: 19 degrees
minutes east, decreasing nually 12 minutes per year
Selected References
etsky, J. A. (1976): Mesozoic and ?Tertiary Rocks of Quatsino nd, Vancouver Island, British Columbia; Geological Survey of ada, Bulletin 242, 243 pages
er, J. E. and Roddick, J. A. (1983): Alert Bay - Cape Scott; ological Survey of Canada, Map 1552A, scale 1:250 000.
er, J. E., Northcote, K. E. and Carlisle, D. (1974): Geology mineral deposits of Alert Bay - Cape Scott map area, couver Island, British Columbia; Geological Survey of ada, Paper 74-8, 77 pages
North American Datum 1983 (NAD83). Universal Transverse Mercator Projection (Zone 9). Elevation in metres above mean sea level. Contour interval 100m.
128° 00'
70 72 73 7471 575000
68
71
72
5570
000N
66
67
69
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Rock
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800
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88 89 90 91 928584 86 87
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127° 36'
9997 98 600 0193 9694 95
1000
400
600
800
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66
67
69
71
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Aphanitic tocommonly asuccession;
Medium to plimestone; mlayers and a
equivalents debris-flow dcontains abu
Volcaplagioof phrlocally
Carnian (possibly KARMUTSEN FOR
Carnian to Early NQUATSINO FORM
VANCOUVER GROUPPER TRIASSIC
uTrQ
uTrPv
uTrKfo plagioclase-phyric and locally plagioclase-megacrystic basaltic lava flows, amygdaloidal; predominantly subaerial flows in the upper part of the may include minor pillow lava, pillow breccia and hyaloclastite
pale grey, thinly bedded to massive micritic limestone and locally bioclastic minor silica replacements and chert nodules; rare laminated interbeds, ooliticalgal structures; locally fossiliferous; unit is very thin (<40m) on the West Coast
and volcaniclastic breccia, and rare pebbly sandstone, conglomerate and deposits; calcareous facies locally contain colonial coral horizons; shale locallyundant bivalves
anic lithotypes within the Parson Bay Formation: mainly aphanitic to clinopyroxene-oclase-phyric, basaltic waterlain breccia and tuff; includes lithic tuff and tuff-brecciareatomagmatic origin; minor pillow lava and hyaloclastite; and rare subaerial flows;y interbedded with lithic wacke and typical Parson Bay sedimentary rock types
latest Middle Triassic at the base)RMATION
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.........................
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Plagioclase-megacrystic basalt/andesite, LeMare Lake Volcanic Succession
intercalated with basalt near the top of the successionThin (<10m) lens of grey intra-Karmutsen limestone
Ar/ Ar date (Ma, 2 sigma error); Bi, biotite
Road (dirt)
MINFILE Locality
Outcrop Examined
Outcrop too small to show at map scale
U-Pb zircon date (Ma, 2 sigma error)
Plagioclase-megacrystic Karmutsen basalt
Fossil age designation
(R) Rutherfordi; (C) Cordilleranus; (S) Suessi
S Sinemurian; P Pliensbachian
H Hauterivian; B Barremian
(Di) Dilleri; (W) Welleri; (K) Kerri;
T Late Triassic; J Jurassic; K Cretaceouse early; m middle; l late
C Carnian; N Norian; R RhaetianLate Triassic:Jurassic:Cretaceous:Ammonoid Zones:
.........................
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G. T
Nixon, G. T., HamFriedman, R. M.Tozer, T. and CoNorthern VancoResources, Geo
Digital Cartography
G. T. Nixon and R. D. M. Rayner
T. Nixon, M. C. Kelman, K. A. Johnston and R. D. M. Rayner
Data Compilation
Recommended Citation
mmack, J. L., Hamilton, J. V., Jennings, H., Larocque, J. P.,, Archibald, D. A., Orchard, M. J., Haggart, J. W., Tipper, H. W.,
ordey, F. (2009): Geology of the Mahatta Creek Area,uver Island; B.C. Ministry of Energy, Mines and Petroleum
oscience Map 2006-4.