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Reconstruction of mantle sections beneath Yakutian kimberlite pipes using monomineral thermobarometry

By
I. V. Ashchepkov
I. V. Ashchepkov
Institute of Geology and Mineralogy SD RAS, Koptyug ave 3, Novosibirsk, Russia (e-mail: Igor.Ashchepkov@uiggm.nsc.ru)
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N. P. Pokhilenko
N. P. Pokhilenko
Institute of Geology and Mineralogy SD RAS, Koptyug ave 3, Novosibirsk, Russia (e-mail: Igor.Ashchepkov@uiggm.nsc.ru)
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N. V. Vladykin
N. V. Vladykin
Institute of Geochemistry SD RAS, Favorsky Str. 1a, Irkutsk, 664033, Russia
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A. Y. Rotman
A. Y. Rotman
Central Science and Research Geology and Prospecting Institute of the Stock Company ‘ALROSA’, Chernyshevsky Str, 7, Mirny, 678170Russia
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V. P. Afanasiev
V. P. Afanasiev
Institute of Geology and Mineralogy SD RAS, Koptyug ave 3, Novosibirsk, Russia (e-mail: Igor.Ashchepkov@uiggm.nsc.ru)
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A. M. Logvinova
A. M. Logvinova
Institute of Geology and Mineralogy SD RAS, Koptyug ave 3, Novosibirsk, Russia (e-mail: Igor.Ashchepkov@uiggm.nsc.ru)
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S. I. Kostrovitsky
S. I. Kostrovitsky
Institute of Geochemistry SD RAS, Favorsky Str. 1a, Irkutsk, 664033, Russia
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L. N. Pokhilenko
L. N. Pokhilenko
Institute of Geology and Mineralogy SD RAS, Koptyug ave 3, Novosibirsk, Russia (e-mail: Igor.Ashchepkov@uiggm.nsc.ru)
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M. A. Karpenko
M. A. Karpenko
Aykhal Mining Enterprise of Stock Company ‘ALROSA’, Almazny Str., 3-26, Aykhal, 678170Russia
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S. S. Kuligin
S. S. Kuligin
Institute of Geology and Mineralogy SD RAS, Koptyug ave 3, Novosibirsk, Russia (e-mail: Igor.Ashchepkov@uiggm.nsc.ru)
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E. V. Malygina
E. V. Malygina
Institute of Geology and Mineralogy SD RAS, Koptyug ave 3, Novosibirsk, Russia (e-mail: Igor.Ashchepkov@uiggm.nsc.ru)
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Y. B. Stegnitsky
Y. B. Stegnitsky
Central Science and Research Geology and Prospecting Institute of the Stock Company ‘ALROSA’, Chernyshevsky Str, 7, Mirny, 678170Russia
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N. A. Alymova
N. A. Alymova
Institute of Geochemistry SD RAS, Favorsky Str. 1a, Irkutsk, 664033, Russia
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O. S. Khmelnikova
O. S. Khmelnikova
Institute of Geology and Mineralogy SD RAS, Koptyug ave 3, Novosibirsk, Russia (e-mail: Igor.Ashchepkov@uiggm.nsc.ru)
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Published:
January 01, 2008

Abstract

Four original monomineral methods for mantle peridotite associations are used to reconstruct PT conditions beneath the kimberlite pipes of Yakutia. The clinopyroxene Jd–Di method gives the closest coincidence with Opx barometry in accord with all physico-chemical boundaries. Garnet thermometers calibrated using Opx, Gar–Cpx and Ni-garnet thermometers and two variants of barometers were developed separately for pyroxenites and peridotites. A Cr–Sp thermobarometer uses the monomineralic version of the Ol–Sp thermometer and a newly calibrated Cr–Sp barometer. A picroilmenite method uses the Ol–Sp thermometer and a pressure-calibration of the geikielite component. Each mantle column is divided into two (upper and lower) sections by a pyroxenite layer located near 40 kbar. Below the pyroxenite layer, the lower section comprises 3–4 lithologically distinct horizons, with a thermally perturbed layer at the base. Above the pyroxenite layer are 3–5 lithologically distinct horizons, which are more fertile than the lower sections. Splitting of the geotherms characterizes most PT diagrams and is ascribed to multistage melt percolation processes typical for the mantle beneath kimberlite pipes. The largest pipes are diamond-bearing and have a highly depleted peridotite lens above the asthenospheric layer.

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Contents

Geological Society, London, Special Publications

Metasomatism in Oceanic and Continental Lithospheric Mantle

M. Coltorti
M. Coltorti
Università degli Studi di Ferrara, Italy
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M. Grégoire
M. Grégoire
Université Toulouse III, France
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Geological Society of London
Volume
293
ISBN electronic:
9781862395411
Publication date:
January 01, 2008

GeoRef

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