Modeling of the crossection layering and internal mantel structures beneath the regions of the kimberlite magmatism with the monomineral thermobarometry for five phases .

I.V. Ashchepkov (1), S.S. Kuligin (1), N.V. Vladykin (1), V.P. Afanasiev A.P. (1), Smelov (2), T. Ntaflos (3), M.I. Lelyukh (4), S.I. Kostrovitsky (5), N.S. Tychkov (1), A.M. Agashev (1), Yu.I. Ovchinnikov (1), E.N. Nigmatulina (1), and O.S. Khmelnikova (1)Institute of Geology and Mineralogy SD RAS, Novosibirsk, Russia; (1) institute of Diamond and Noble metals , Yakutsk (2); University of Vienna (3); Institute of Geochemistry SD RAS, Irkutsk, Russia; (4) ALROSA Company, Mirny, Russia (5)

The transect through the subcratonic lithospheric mantle (SCLM) in major kimberlitic fields of Siberian cratons using methods of the monomineral thermobarometry for: Upper Devonian, Early Triassic and Upper Jurassic. Most of the terranes of central part of Siberian craton in upper Devonian time reveal a sharp layering of 6 major units, which are fairly well better defined determined for mantle sequence for in the large pipes of like Udachanaya pipe and Mir pipe. The best transect was obtained in Daldyn field in Udachnaya - Zarnitsa line. Transects obtained using different minerals show s similar inclination to the east. The merged Fe# for all minerals produces smoother and complete transects. The mantle layering in Alakit field determined in Krasnopresnenskaya – Sytykanskaya transect show moderate inclination from the N to S. The inflection near the Yubileinaya – Aykhal was also supported by high peridotite depletion at this line and difference in the geochemical features of mantle minerals showing the Zr dips in southern part. This line probably served for the fluid enriched melt migration in Archean time and was responsible for the generation of the diamonds. This flexure as well as those in line Udachnaya – Zarnitsa probably were the melt transfer not only in Archean but also in Upper Devonian time and was responsible for high concentration of the kimberlite pipes. The Upper Muna mantle section based on kimberlite concentrates and garnets from sands in Muna river tributaries show the flat mantle section. It can not be result of the garnets garnet transport by river. The presence of the depleted horizon near 30 km istypical features of Upper MunaSCLM In the Malo Botuobinsky field sharply layered section starts from 55 kbar revealing stair –like P-Fe#Ol path. Deeper part was originally highly depleted but regenerated by protokimberlites. The mantle layering is similar beneath XXIII Siezda, Dachnaya and Mir pipes. The mantle peridotites beneath Internationalnaya were regenerated by the Ca, Al, Cr, Na- rich hybrid melt from base to 40 kbar. In Upper Devonian the separate terranes show different history and geodynamic settings in the mantle level. The mantle layering in Daldyn, Alakite and Malo- Botuobinsky fields was mostly created by the merging of the highly inclined layers from the margins while Upper Muna seems to be produced by the low angle subduction. The Lower Jurassic Kimberlite from the Kharamai – Kuoika field show the waved basement of the SCLM slightly inclined from the west to east which is . Known diamondiferous pipes locate at the peripheral parts of the Anabar shield. Ilm - Phl metasomatized dunites are common from 75 to 40 kbar in SCLM. In Upper Jurasic SCLM sequences starts mainly from 130 km.. The garnet series demonstrate straight line trend due to interaction with superplume melts. The highly enriched upper part of mantle section starts from the pyroxenite. lens at 40kbar. RBRF grant 11-05-00060.

01 02 03 04 05 06 07 08 09 01 0 0

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An

nu

mp

alle

Bra

hman

palle

Kal

yand

urg

Ura

vako

nda

Waj

raka

rur

WK

-7

India Ca -Garnet (Griffin ea 2009)

1 02 03 04 05 06 07 08 09 01 0 0

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Fe#-garnetCa-garnet

Arkhangelsk

P

2

1200

C2+3

C2+3

C2+3

C2+3

C2+3

C2+3

C2+3

C2+3

V2 mz V2 pd

P

V2 mz

V2 up

V2 mz

IV__V2 mz

PP

P

P

P

VI__

C

III__

I__ II__

V__

C2+3

P

5 0 15 km

PC2+3V2

I

* *

*

***

*****

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***

_

_

__I

III__

1.

2.

3.

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7.

*2.

1.

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1.

_

__

PervomaiskayaKol'tsovskayaLomonosovPomorskayaPionerskayaKarpinsky-2Karpinsky-1Arkhangel’skayaSnegurozka

Griba

* Pobeda

* Chidvijskaya

Scheme of Archangelsk diamond province

Разрез мантии под Dharwar craton Индиии по (W Griffin et al , 2009)A translithospheric suture in the vanished 1-Ga lithospheric root of South India: Evidence from contrasting lithosphere sections in the Dharwar Craton: Evidence from contrasting lithosphere

sections in the Dharwar Craton. Lithos, 112s. 2009

Mantle section

beneath Archangelsk

region

Alakite field

Baika

l lak

e

Norilsk

- 1

- 3

- 2

Laptev sea

- 4

- 6

- 5

1.

4.3.

2.

7.

35.

16.17.15.

23.

9.

6.

Anabar shield

8.

5.

11.24.

27.

29.

31.

32.

30.

28.

10.

12.

13.

14.18.

19.11.20. 11.

22.

Aldan shield26.

28.

33.

34.

Yakutsk

Irkutsk

Ana

bar

- 7

36.

- 8

Transect from Anabar to Malo- Botuobinsky field

Nak

yn

Ala

kite

Da

ldy

n

Up

per

Mu

na

Ku

ran

akh

Ary

-Ma

sta

kh

80

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40

30

20

10

0

MA

lo -

Bo

tuo

bin

sky

1.522.533.544.555.566.577.588.510121314202530354045

Fe#All Minerals with IlmeniteCrust

0 200 400 600 800 1000Distance km

Sta

ray

a R

ec

hk

a

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Ma

lo B

otu

ob

ins

ky

Ala

kite

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dyn

Up

per

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na

Nak

yn

Fe#All Minerals with IlmeniteCrust

0 50 100 150 200 250 300 350 400 450 500 550 600 650 700Distance km

Fe#All Minerals with IlmeniteCrust

Ku

oyk

a

Ku

ran

akh

Ary

-Mas

takh

Dyu

ken

Sta

raya

rec

hka

Kar

ny

tuff

s

Kh

aram

ai

Transect West - East through Anabar and surroudings Transect Malo – Botuobinsky Upper Muna

0 5 10 15 20 25 30 35Distance km

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Ud

ach

nay

a

Aer

om

agn

itn

aya

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tiva

lnay

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kovi

nsk

aya

Go

rnya

tska

ya

Zar

nit

sa

Po

lyar

nay

a

Let

nya

yaZ

imn

yay

Ose

nn

yaya

Fe#Cpx

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Ca#Gar

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Fer#ChrCa#Gar

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Fe#Ilm

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ach

nay

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tiva

lnay

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Bu

kovi

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aya

Go

rnya

tska

ya

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nit

sa

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lyar

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nya

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imn

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nn

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0 5 10 15 20 25 30 35Distance km

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Na#GarFe#Gar

ZarnitsaLetnyayaAerogeologicheskaya

Festivalnaya

Polyarnaya

Osennyaya

BukovinskayaGornyatskaya

Udachnaya

AykhalZarya

Sytykanskaya

Krasnopresnenskaya

Yubileinaya KomsomolskayaOzernaya

LeningradskayaDolgozhdannaya

Ukrainskaya

DalnyayaZagadochnaya

ZarnitsaLetnyayaAerogeologicheskaya

Udachnaya FestivalnayaPolyarnaya

1. 2. 3.

Irelyakhskaya

Osennyaya

BukovinskayaGornyatskaya

3

2

1

2

1.522.533.544.555.566.577.588.510121314202530354045

80

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rny

atsk

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imn

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sen

ny

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1.522.533.544.555.566.577.588.510121314202530354045

Fe#All Minerals

Fe#All SiicatesCrust

Crust

0 5 10 15 20 25 30 35Distance km

0 5 10 15 20 25 30 35Distance km

1.522.533.544.555.566.577.588.510121314202530354045

0 10 20 30 40 50 60 70Distance km

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orn

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tnya

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ny

ay

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ьн

яя

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ing

rad

skay

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fis

ich

esk

aya

До

лго

жд

анн

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lyak

hs

kay

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ado

ch

na

ya

Crust

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Fe#All Minerals

Fe#All SilikateCrust

Daldyn SCLMT Udachnaya -

Zagadochnaya

Daldyn, transect Udachnaya -

Zarnitsa

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Fe#All Minerals with IlmeniteCrust

1.522.533.544.555.566.577.588.510121314202530354045

0 20 40 60 80 100 120 140 160Distance km

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Fe#All silcatesCrust

1.522.533.544.555.566.577.588.510121314202530354045

Ud

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ko

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orn

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lyar

nay

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y O

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ny

aya

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lnya

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ing

rad

skay

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fisi

ches

kaya

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lgo

zdan

nay

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Irel

yakh

skay

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ado

chn

aya

Ayk

hal

Zyr

ya

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sno

pre

snen

skay

a

Ko

mso

mo

lska

ya

Syt

ykan

skay

a

An

om

aln

aya

Yu

bile

ynay

a

Oze

rnay

a

0 5 10 15 20 25 30 35 40Distance km

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Fe#All MineralsCrust

1.522.533.544.555.566.577.588.510121314202530354045

1.522.533.544.555.566.577.588.510121314202530354045

0 5 10 15 20 25 30 35 40Distance km

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Fe#All Silcate Minerals Crust

Ayk

hal

Zy

rya

Kra

sno

pre

snen

skay

a

Ko

mso

mo

lska

ya

Syt

ykan

skay

a

An

om

aln

aya

Yu

bile

ynay

aO

zern

aya

Alakite SCLMT Sytykanskaya -

Krasnopresnenskaya

Transect Udachnaya - Krasnopresnenskaya

CaO in garnetsCrustCrust Fe# All Min with Ilmenites

8

7

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Nakyn

May

skay

a

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tuo

bin

skay

a

Nyu

rbin

skay

a

May

skay

a

Bo

tuo

bin

skay

a

Nyu

rbin

skay

a

1 2 3 4 5 6

km1 2 3 4 5 6

km

1.522.533.544.555.566.577.588.510121314202530354045

80

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60

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20

10

0

0 10 20 30 40Distance km

Dja

ng

a

Mu

za

Ob

naz

hen

nay

a

Sly

ud

yan

ka

Mer

y

All m ineralsCrust

80

70

60

50

40

30

20

10

0

0 5 10 15 20

Dac

hn

aya

Inte

rnat

ion

aln

aya

Am

akin

skay

a

Tae

zhn

aya

Mir

Crust

Dac

hn

aya

Inte

rnat

ion

aln

aya

Am

akin

skay

a

Tae

zhn

aya

Mir

Sp

utn

ik

XX

III S

iezd

a

Crust

80

70

60

50

40

30

20

10

0

0 5 10 15 20

Fe# All silicate Min

1.522.533.544.555.566.577.588.510121314202530354045

XX

III S

iezd

a

Fe# All Min with Ilmenites

Sp

utn

ik

1.522.533.544.555.566.577.588.510121314202530354045

80

70

60

50

40

30

20

10

0

1.5

2

2.5

3

3.5

4

4.5

5

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6

6.5

7

7.5

8

8.5

10

12

13

14

15

102030405060708090100

1.5

2

2.5

3

3.5

4

4.5

5

5.5

6

6.5

7

7.5

8

8.5

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12

13

14

15

80

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Fe# Garnet CaO Garnet

Malo Botuobinsky, Transsect Mir - Taezhnaya

203040506070809010

20

30

40

50

60

70

10

20

30

40

50

60

70

Pio

ner

skay

a

Lom

onos

ovsk

aya

Pom

orsk

aya

Kar

pin

skog

oA

rkha

ngel

skay

a

Pob

eda

Car

bon

ifer

ous

san

dsto

nes

V.G

rib

pipe

Ch

idvi

nn

skay

a

4

5

6

7

8

9

10

11

12

13

14

15

Fe#Ol

Nakyn, Transsect Nyurbinskaya Mayskaya

Kuoyka field transsect Mery - Muza