Trace element study of the xenoliths study of the mantle xenoliths From Sytykanskaya pipe, Yakutia....

Trace element study of the xenoliths study of the mantle xenoliths From Sytykanskaya pipe, Yakutia.

Igor Ashchepkov (1), Theodoros Ntaflos (2), and Zdislav Spetsius (3)(1) Institute of Geology and Mineralogy, Geodynamics, Novosibirsk, Russian Federation

([email protected]), (2)University of Vienna, Austria, (3) Alrosa Stock Company, Mirny, Russia

Dalnyaya

Udachnaya

Zarnitsa

Sytykanskaya

C

D

EF

B

A

Pyropes from Breccia and Porphyric kimberlite

0 2 4 6 8 10 12

Cr2O 3%

0

4

8

12

Ca

O%

0 2 4 6 8 10 12

Cr2O3

4

8

12

16

FeO

%

0 2 4 6 8 10 12

Cr2O 3%

0

0.4

0.8

1.2

1.6

2

TiO

2%

0 2 4 6 8 10 12

Cr2O3

8

12

16

20

24

Mg

O%

0 2 4 6 8 10 12

Cr2O 3%

0

0.05

0.1

0.15

0.2

0.25

Na

2O%

0 2 4 6 8 10 12

Cr2O 3%

0

0.2

0.4

0.6

Mn

O%

0 2 4 6 8 10 12

Cr2O3

0

4

8

12

Ca

O%

0 2 4 6 8 10 12

Cr2O3

4

8

12

16

Fe

O%

0 2 4 6 8 10 12

Cr2O3

0

0.4

0.8

1.2

1.6

2

TiO

2%

0 2 4 6 8 10 12

Cr2O3

8

12

16

20

24

Mg

O%

0 2 4 6 8 10 12

Cr2O3

0

0.05

0.1

0.15

0.2

0.25

Na

2O%

0 2 4 6 8 10 12

Cr2O3

0

0.2

0.4

0.6

Mn

O%

S ytykan pyropes

BrecciaXenolithsDiam ond inclusions

Porphyric kim berliteXenoliths inalyzed by LAM ICP

CHROMITES

2 4 6FeO %

0

1

2

3

4

5

Cr 2

O3

%

2 4 6FeO %

0

0.2

0.4

0.6

0.8

1

TiO

2 %

2 4 6

2

4

6

Na

2O %

2 4 6

4

8

12

Al 2

O3

%

8 16MgO %

2

4

6

8

10

Na

2O %

ConcentrateXenolithsMetasomatites with richteriteDiamond inclusionsPyroxente and veined xenolith with ICP data

Veined xenoliths with Ilm

2 4 6FeO %

0

1

2

3

4

5

Cr 2

O3

%

2 4 6

FeO %

0

0.2

0.4

0.6

0.8

1

TiO

2 %

2 4 6

2

4

6

Na 2

O %

2 4 6

4

8

12

Al 2

O3

%

8 16MgO %

2

4

6

8

10

Na 2

O %

ConcentrateXenolithsMetasomatites with richteriteDiamond inclusions

Diamond Eclogites (Spetsius, 2008; Pernet-Fisher et al.,2014)

600 800 1000 1200 1400

600 800 1000 1200 1400

SEA

T oC

GraphiteDiam ond

D a ln y a y a

45 m w /m 2

35 m w /m 2

Sp

Gr

40 m w /m 2

8

7

6

5

4

3

2

1

0

P(G

Pa)

8

7

6

5

4

3

2

1

P(G

Pa)

AOpxG

T oC

8

7

6

5

4

3

2

1

P(G

Pa)

Z a rn itsa

8

7

6

5

4

3

2

1

P(G

Pa)

600 800 1000 1200 1400

SEA

T oC

GraphiteDiam ond

U d a ch n a y a

45 m w /m 2

35 m w /m 2

Sp

Gr

40 m w /m 2

1. OpxMc742. Cpx As103. Cpx NT004. Gar As105. Chr As106. Ilm As7. BrKo90

8

7

6

5

4

3

2

1

P(G

Pa)

8

7

6

5

4

3

2

1

P(G

Pa)

600 800 1000 1200 1400

SEA

T oC

S y ty k a n sk a y a

45 m w /m 2

35 m w /m 2

Sp

Gr

40 m w /m 2

Diam ond

Graphite

8

7

6

5

4

3

2

1

0

P(GPa) 8

7

6

5

4

3

2

1

AFG

0.10

1.00

10.00

100.00

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ple

/PM

Rb Th Nb La Pb Nd Sm Zr Gd Ho Er Lu

0.01

0.10

1.00

10.00

100.00

1000.00

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ple

/PM

Clinopyroxenes

Ilm enites from the feeders at the SCLM base

Ce Nd Sm Gd Dy Er Yb Cs Ba U Ta Ce Pr Sr Hf Eu Dy Y Yb

La Pr Eu Tb Ho Tm Lu

0.01

0.10

1.00

10.00

100.00

Sam

ple

/PM

Ce Nd Sm Gd Dy Er Yb

Ce Nd Sm Gd Dy Er Yb Rb Th Nb La Pb Nd Sm Zr Gd Ho Er Lu

0.00

0.01

0.10

1.00

10.00

100.00

1000.00

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ple

/PM

Cs Ba U Ta Ce Pr Sr Hf Eu Dy Y Yb Rb Th Nb La Pb Nd Sm Zr Gd Ho Er Lu

0.00

0.01

0.10

1.00

10.00

100.00

1000.00

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ple

/PM

Concentrate


0.10

1.00

10.00

100.00

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ple

/PM

Garnets

Ce Nd Sm Gd Dy Er Yb Cs Ba U Ta Ce Pr Sr Hf Eu Dy Y YbLa Pr Eu Tb Ho Tm Lu Ce Nd Sm Gd Dy Er Yb


0.00

0.01

0.10

1.00

10.00

100.00

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ple

/PM

Chrom ites

Ce Nd Sm Gd Dy Er Yb Cs Ba U Ta Ce Pr Sr Hf Eu Dy Y YbLa Pr Eu Tb Ho Tm Lu

0.01

0.10

1.00

10.00

100.00

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ple

/PM


0.00

0.01

0.10

1.00

10.00

100.00

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ple

/PM


0.01

0.10

1.00

10.00

100.00

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ple

/C1


0.00

0.01

0.10

1.00

10.00

100.00

1000.00

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ple

/PM

Garnets


Cs Ba U Ta Ce Pr Sr Hf Eu Dy Y Yb


0.01

0.10

1.00

10.00

100.00

Sa

mp

le/C

1


0.10

1.00

10.00

100.00

Sam

ple

/C1


0.00

0.00

0.01

0.10

1.00

10.00

100.00

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/PM


0.00

0.01

0.10

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1 . 2 . 3 . 4 . 5 .

Clinopyroxenes Sytykan Veined Peridotite xenoliths


0.01

0.10

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100.00

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/C1


0.00

0.01

0.10

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10.00

100.00

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/PM


Chrom ites

Phlogopites

0.001

0.01

0.1

1

10

100

Cs Rb Ba Th U Nb Ta La Ce Pb Pr Nd Sr Sm Hf Zr Eu Gd Dy Ho Y Er Yb Lu

Sam

ple

/PM

S15 S16

0.001

0.01

0.1

1

10

100

1000


Sam

ple

/PM

S17 S19 S20

0.001

0.01

0.1

1

10

100

1000

10000


Sam

ple

/PM

S26 S27

0.001

0.01

0.1

1

10

100


Sam

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/PM

S28 S29

0.001

0.01

0.1

1

10

100

1000

10000


Sam

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/PM

S30 S31

0.001

0.01

0.1

1

10

100


Sam

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/PM

S32 S33

0.001

0.01

0.1

1

10

100

1000

10000


Sam

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/PM

S35 S36 S37

0.001

0.01

0.1

1

10

100

1000

10000


Sam

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/PM

S35 S36 S37

0.001

0.01

0.1

1

10

100


Sam

ple

/PM

S38 S39

c

Trace Element patterns for minerals from Breccia xenocrysts and Metasomatic xenolith


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0.01

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Garnets

Ilm enites




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0.01

0.10

1.00

10.00

100.00

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0.01

0.10

1.00

10.00

100.00

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0.01

0.10

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10.00

100.00

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Clinopyroxenes

Sytykan parental melts for minerals from Veined Peridotite xenoliths

0.01

0.10

1.00

10.00

100.00

1000.00

10000.00

Sa

mp

le/P

M


0.01

0.10

1.00

10.00

100.00

1000.00

10000.00

Sam

ple

/PM

Clinopyroxenes

Ilm enites



0.01

0.10

1.00

10.00

100.00

1000.00

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ple

/PM

Ce Nd Sm Gd Dy Er Yb


0.01

0.10

1.00

10.00

100.00

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ple

/PM


Melts parental for the xenocrysts from concentrate

Garnets

Ce Nd Sm Gd Dy Er Yb Cs Ba U Ta Ce Pr Sr Hf Eu Dy Y YbLa Pr Eu Tb Ho Tm Lu

0.01

0.10

1.00

10.00

100.00

1000.00

10000.00

Sa

mp

le/P

M


0.01

0.10

1.00

10.00

100.00

1000.00

10000.00

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ple

/PM


Dal

nya

ya

Zag

ado

chn

aya

Ilm

en

ito

va

ya

Irel

yakh

skay

a

Do

lgo

zhd

ann

aya

Aka

dem

ich

eska

ya

Ud

ac

hn

ay

a

Po

lya

tna

ya

Fe

sti

va

lna

ya

Ae

rom

ag

nit

na

ya

Go

rny

ats

ka

ya

Bu

ko

vin

sk

ay

a

Zar

nit

saO

se

nn

ya

ya

Zim

ny

ay

aL

en

ny

ay

a

Ma

lyu

tka

Ne

vid

imk

a

Len

ing

rad

skay

a

Geo

ph

ysic

hes

kaya

Ya

ku

tsk

ay

a

Uk

rain

sk

ay

a

Ko

ms

om

ols

ka

ya

Sy

tyk

an

sk

ay

a

Oze

rnay

a

Kra

sn

op

res

ne

ns

ka

ya

Ay

kh

al

Za

rya

No

ya

brs

ka

ya

Fa

ins

hta

ino

vs

ka

ya

So

bo

lev

a

Ra

dio

vo

lno

va

ya

Ap

rels

ka

ya

Mo

lod

os

t

Yu

bil

ey

na

ya

8

7

6

5

4

3

2

1

0

Fe#All Silicates and ChrCrust

8

7

6

5

4

3

2

1

0

0 20 40 60 80 100 120 140 160Distance km

0 20 40 60 80 100 120 140 160Distance km

-5

-4 .6

-4 .2

-3 .8

-3 .4

-3 .2

-2 .8

-2 .4

-2

-1 .6

-1 .2

-0 .8

-0 .4

0

0.225

0.3

8

7

6

5

4

3

2

1

0

0 20 40 60 80 100 120 140 160Distance km

20025030035040045050055060065070075080085090095010001050110011501200125013001350140014501500

1.522.533.544.555.566.577.588.51012131420253035

W est Daldyn (Alakit field)East Daldyn (Daldy field)

FO2 for Silicates and ChrCrust

ToC for Silicates and Chr

Detail study of the mantle xenoliths from Sytykan pipe were performed for the Cpx- Phl- Sp -Ilm associations (>30) commonly substituting garnets and rarely containing richterites. eclogites (3), and Ilm- Gar pyroxenites as well as f or the Cr—Di bearing websterites and clinopyroxenites containing graphites (8). Most of the metasomatites and pyroxenites belong to the middle part of the mantle section and refer to the straight line rather low temperature (1000 at 6.0GPa) geotherm. Majority of the garnets in the show the semi circle patterns with the low Sr LREE and LILE but peak in Pb and U and small enrichments in some LILE. But Cpx substituting them sometimes vary in major element compositions and TRE also reveal Nb-Ta troughs and slightly lower in Zr-Hf but Rb-Ba enrichments. The Phl in such associations commonly have very low REE concentration but very high Ba, Rb ,Cs but level of the Th-U-Nb-Ta nearly close to those from the CPx. The amphiboles have th TRE patterns close t those of Cr- diopsides but enrichment in Ta- Nb but much less in Zr-Hf. He Low Cr Ilm-Gar pyroxenite show nearly flat TRE patterns for the Cpx and ilmenites and strong TRE depletion for garnets. The Cpx show enrichment in Th-U and smaller on in HFSE as well garnet reveal elevated U-Nb-Ta and all minerals shows slightly higher Rb-Cs but depletion in Ba. One of the intergranular grains from eclogites show the composition derived from protokimberlite and show 700 enrichment in LREE relative to primitive mantle and very deep Nb-Ta and Zr-Hf troughs due to Ilm precipitation but slightly elevated Ba-Th-U. The eclogites don’t show very special distributions from Cat-Cpx showing slightly lower concentrations of the incompatible elements and small peaks in U, Pb and even Rb-Cs. The Cr-diopside bearing websterites from garnet Cr-bearing pyroxenites show different enrichments in REE highly inclined and straight line patterns and deep troughs in Ba and varying enrichment in Nb-Ta-U which are lower than REE. Those with lower TRE levels reveal Zr-Hf dips. Garnets from the pyroxenites show more straight line patterns than those from common lherzolites and pyroxenites from alkali basalts They are characterized by deep troughs of Ba, Sr, and small Pb, U, small dips in Zr and Hf and quite different levels of Ta, Nb with general enrichment. Thus the metasomatic association and Cr- bearing pyroxenites probably were formed by the same probably agents enriched in LILE and U probably included the reactivated subducted related materials RBRF grants 05-05-64718, 03-05-64146; 08-05-00524; 11-05-00060; 11-05-91060-PICS and joint research projects of IGM SB RAS and ALROSA Stock company 77-2, 65-03, 02-05.

Fig.2. Photo images of the mantle xenoliths from Sytykanskaya pipe. A. Fine-grained granular garnet lherzolite. B. Coarse-grained granular garnet lherzolite. C. Deformed garnet peridotite. D. Details of garnet lherzolites: Cpx corona on garnet. E. Metasomatic microveins and coronas of Cpx and Phl on garnets. F. Sp harzburgite. G. Garnet harzburgite with disseminated idiomorphic phlogopite. H. Garnet dunite. I Garnet harzburgite with Phl . J. Serpentinized garnet-bearing harzburgite with abundant intergranular Ilmenite. K. Details of substitution of garnet grains by Cpx-Phl-Ilm aggregates. L. Phl-Cpx-Ulvospinel-Ilm veinlets in peridotites. M. Garnet harzburgite with garnet partly substituted by Phl and Cpx. N. Garnet harzburgite with disseminated Ilm and Phl. O. Deformed ilmenite peridotite.

P o rph yric k im b erlite

40 44 48 52

T iO 2 %

0.0

0.4

0.8

1.2A l2O 3 %

40 44 48 52

T iO 2 %

0

2

4

6C r2 O 3 %

30

40

50

60 T i O 2 %

0 4 8 12 16 20

M gO %

0 % F e2 O 3

20 % F e2O 3

40 % F e2O 3

40 44 48 52

T iO 2 %

20

30

40

50

60F eO %

40 44 48 52

T iO 2 %

0.0

0.1

0.2

0.3 N iO %

40 44 48 52

T iO 2 %

-0.2

0.0

0.2

0.4

0.6

0.8V 2O 5 %

40 44 48 52

T iO 2 %

0.0

0.2

0.4

0.6

0.8 M n O %

B recc ia

40 44 48 52

T iO 2 %

0.0

0.4

0.8

1.2 A l2 O 3 %

40 44 48 52

T iO 2 %

0

2

4

6C r2 O 3 %

30

40

50

60 T i O 2 %

0 4 8 12 16 20

M gO %

0 % F e2O 320 % F e2O 3

40 % F e2 O 3

40 44 48 52

T iO 2 %

20

30

40

50

60F eO %

40 44 48 52

T iO 2 %

0.0

0.1

0.2

0.3 N iO %

40 44 48 52

T iO 2 %

-0.2

0.0

0.2

0.4

0.6

0.8V 2O 5 %

40 44 48 52

T iO 2 %

0.0

0.2

0.4

0.6

0.8 M n O %

Porphyric kim berliteBrecciaXenolithsMetasom atites with richteritePyroxenites veined xenoliths and breccia xenocrysts with ICP Data

Ilmenitesfrom Breccia and Porphyric kimberlite

0 20 40 60

C r2 O 3 w t %

0

0.2

0.4

0.6

0.8

1

Mn

wt%

0 20 40 60

C r2 O 3 w t %

0

0.2

0.4

0.6

0.8

V2O

5 w

t %

0 20 40 604

8

12

16

20

24

28

MgO

wt%

0 20 40 600

10

20

30

40

50

60

FeO

wt %

0 20 40 600

10

20

30

40

50

Al 2

O3

wt%

0 20 40 60

C r2 O 3 w t %

0

4

8

12

16

TiO

2 w

t %

0 20 40 60

C r2 O 3 w t %

0

0.1

0.2

0.3

0.4

0.5

NiO

wt %

BrecciaXenolithsPorphyric kim berliteDiam ond inclusionsPyroxente and veined xenolith with ICP data

Clinopyroxenes

1. CaO in Gar2. Al2O 3 in Opx3. Cr2O3 in Cpx4. TiO 2 in Chr5. Cr2O3 in Ilm

0.05 0.10 0.15 0.20 0.25 0.30 0.35600 800 1000 1200 1400

Fe# Ol in equilibrium with Cpx, Opx, Gar, Chr, Ilm

0.0 4.0 12.0 16.0 -6.0 -4.0 -2.0 0.0

SEA

T oCS y ty k a n sk a y a X en o lith s

45 m w /m 2

35 m w /m 2

Sp

Gr

40 m w /m 2

Diam ond

Graphite

8

7

6

5

4

3

2

1

0

P(GPa) 8

7

6

5

4

3

2

1

P(GPa) 8

7

6

5

4

3

2

1

P(GPa) 8

7

6

5

4

3

2

1

0-LogFO 2

Variation of Cpx, Opx, Gar, Chr, Ilm

AFG

EM

OG

/D

0.05 0.10 0.15 0.20 0.25 0.30 0.35600 800 1000 1200 1400


0.0 4.0 12.0 16.0 -6.0 -4.0 -2.0 0.0

SEA

T oCS y ty k a n sk a y a P o rp h y r ic

k im b er lite

45 m w /m 2

35 m w /m 2

Sp

Gr

40 m w /m 2

Diamond

Graphite


8

7

6

5

4

3

2

1

0

P(GPa) 8

7

6

5

4

3

2

1

P(GPa) 8

7

6

5

4

3

2

1

P(GPa) 8

7

6

5

4

3

2

1

0-LogFO 2


AFG

1. O pxBrM c2. O pxBrM cDiIn3. CPx NT004.CpxAs5.EclCpx6.PxtCpx7.DI Cpx 8.GarOW 79As9.GarDI10.ChrAs11. ChrDiaInc 12. Ilm M eg13. Ilm Xen14. BrKo90 E

MO

G/D

0.05 0.10 0.15 0.20 0.25 0.30 0.35600 800 1000 1200 1400


0.0 4.0 12.0 16.0 -6.0 -4.0 -2.0 0.0

SEA

T oCS y ty k a n sk a y a A u to lith ic

B recc ia

45 m w /m 2

35 m w /m 2

Sp

Gr

40 m w /m 2

Diam ond

Graphite


8

7

6

5

4

3

2

1

0

P(GPa) 8

7

6

5

4

3

2

1

P(GPa) 8

7

6

5

4

3

2

1

P(GPa) 8

7

6

5

4

3

2

1

0-LogFO 2


AFG

EM

OG

/D

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10.00

100.00

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Clinopyroxenes

Ce Nd Sm Gd Dy Er Yb Cs Ba U Ta Ce Pr Sr Hf Eu Dy Y Yb Ce Nd Sm Gd Dy Er Yb

Garnets

Chromites

La Pr Eu Tb Ho Tm Lu Rb Th Nb La Pb Nd Sm Zr Gd Ho Er Lu

0.00

0.01

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1.00

10.00

100.00

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/PM

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Ce Nd Sm Gd Dy Er Yb Cs Ba U Ta Ce Pr Sr Hf Eu Dy Y Yb Ce Nd Sm Gd Dy Er Yb La Pr Eu Tb Ho Tm Lu


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Ilmenite

Ce Nd Sm Gd Dy Er Yb Cs Ba U Ta Ce Pr Sr Hf Eu Dy Y Yb Ce Nd Sm Gd Dy Er Yb

Concentrate

La Pr Eu Tb Ho Tm Lu Rb Th Nb La Pb Nd Sm Zr Gd Ho Er Lu

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Phl

Trace Element patterns for minerals from Pyroxenite xenoliths and Glimmeritic veins 6 8

Si (f.u.)

0

0.1

0.2

0.3

0.4

Cr

(f.u

.)

6 8Si (f.u.)

0

0.05

0.1

0.15

0.2

0.25

Ti

(f.u

.)

6 8

0.004

0.008

0.012

0.016

0.02

Mn

(f.

u.)

6 8

1

2

3

Al

(f.u

.)

1. Sytykan2. Yubileinaya3. Zarnitsa4. Komsom olskaya

6 8

0.6

0.8

1

1.2

1.4

1.6

1.8

Ca

(f.u

.)

0.5K2O%

0.8

1

1.2

1.4

1.6

1.8

Na

(f.u

.)

6 8FeO %

0.2

0.4

0.6

0.8

K (

f.u

.)

6 8Si

1

1.2

1.4

1.6

1.8

2

2.2

K+

Na

(f.

u.)

Pa

rga

sit

e

Pa

rga

sit

e h

orb

len

de

Ho

rble

nd

e

Ric

hte

rite

Pa

rga

sit

e

Ho

rble

nd

e

Ric

hte

rite

Pa

rga

sit

e h

orb

len

de

6 8

0.2

0.3

0.4

0.5

0.6

Fe

(f.

u.)

6 8

3.2

3.6

4

4.4

4.8

5.2

Mg

(f.

u.)

Amphiboles

2 4 6 8FeO %

0

0.5

1

1.5

2

2.5

Cr 2

O3 %

2 4 6 8

FeO %

0

2

4

6

TiO

2 %

2 4 6 8

16

20

24

28

32

Mg

O%

2 4 6 8

10

12

14

16

18

Al 2

O3 %

2 4 6 8

0.2

0.4

0.6

0.8

1

Na 2

O %

2 4 6 8FeO %

32

36

40

44

48

SiO

2 %

1. Pyroxenite xenoliths (with LAM ICP data)2. Peridotite xenoliths3. Veined Ilm peridotites

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Trace elements for minerals from metasomatic vein s(new)

Trace element study of the xenoliths study of the mantle xenoliths From Sytykanskaya pipe, Yakutia....

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