Phlogopite in mantle xenoliths and kimberlite from the Grib pipe, Arkhangelsk province, Russia: Evidence for multi-stage mantle metasomatism and origin of phlogopite in kimberlite
We present petrography and mineral chemistry for both phlogopite, from mantle-derived xenoliths (garnet peridotite, eclogite and clinopyroxene–phlogopite rocks) and for megacryst, macrocryst and groundmass flakes from the Grib kimberlite in the Arkhangelsk diamond province of Russia to provide new i...
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ftdoajarticles:oai:doaj.org/article:bb571ee6ec624d859dfd8f727e394dbd 2023-08-27T04:08:21+02:00 Phlogopite in mantle xenoliths and kimberlite from the Grib pipe, Arkhangelsk province, Russia: Evidence for multi-stage mantle metasomatism and origin of phlogopite in kimberlite A.V. Kargin L.V. Sazonova A.A. Nosova N.M. Lebedeva Yu.A. Kostitsyn E.V. Kovalchuk V.V. Tretyachenko Ya.S. Tikhomirova 2019-09-01T00:00:00Z https://doi.org/10.1016/j.gsf.2018.12.006 https://doaj.org/article/bb571ee6ec624d859dfd8f727e394dbd EN eng Elsevier http://www.sciencedirect.com/science/article/pii/S167498711930026X https://doaj.org/toc/1674-9871 1674-9871 doi:10.1016/j.gsf.2018.12.006 https://doaj.org/article/bb571ee6ec624d859dfd8f727e394dbd Geoscience Frontiers, Vol 10, Iss 5, Pp 1941-1959 (2019) Geology QE1-996.5 article 2019 ftdoajarticles https://doi.org/10.1016/j.gsf.2018.12.006 2023-08-06T00:45:13Z We present petrography and mineral chemistry for both phlogopite, from mantle-derived xenoliths (garnet peridotite, eclogite and clinopyroxene–phlogopite rocks) and for megacryst, macrocryst and groundmass flakes from the Grib kimberlite in the Arkhangelsk diamond province of Russia to provide new insights into multi-stage metasomatism in the subcratonic lithospheric mantle (SCLM) and the origin of phlogopite in kimberlite. Based on the analysed xenoliths, phlogopite is characterized by several generations. The first generation (Phl1) occurs as coarse, discrete grains within garnet peridotite and eclogite xenoliths and as a rock-forming mineral within clinopyroxene–phlogopite xenoliths. The second phlogopite generation (Phl2) occurs as rims and outer zones that surround the Phl1 grains and as fine flakes within kimberlite-related veinlets filled with carbonate, serpentine, chlorite and spinel. In garnet peridotite xenoliths, phlogopite occurs as overgrowths surrounding garnet porphyroblasts, within which phlogopite is associated with Cr-spinel and minor carbonate. In eclogite xenoliths, phlogopite occasionally associates with carbonate bearing veinlet networks. Phlogopite, from the kimberlite, occurs as megacrysts, macrocrysts, microcrysts and fine flakes in the groundmass and matrix of kimberlitic pyroclasts. Most phlogopite grains within the kimberlite are characterised by signs of deformation and form partly fragmented grains, which indicates that they are the disintegrated fragments of previously larger grains.Phl1, within the garnet peridotite and clinopyroxene–phlogopite xenoliths, is characterised by low Ti and Cr contents (TiO2 < 1 wt.%, Cr2O3 < 1 wt.% and Mg# = 100 × Mg/(Mg + Fe) > 92) typical of primary peridotite phlogopite in mantle peridotite xenoliths from global kimberlite occurrences. They formed during SCLM metasomatism that led to a transformation from garnet peridotite to clinopyroxene–phlogopite rocks and the crystallisation of phlogopite and high-Cr clinopyroxene megacrysts before ... Article in Journal/Newspaper Arkhangelsk Directory of Open Access Journals: DOAJ Articles Geoscience Frontiers 10 5 1941 1959 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geology QE1-996.5 |
spellingShingle |
Geology QE1-996.5 A.V. Kargin L.V. Sazonova A.A. Nosova N.M. Lebedeva Yu.A. Kostitsyn E.V. Kovalchuk V.V. Tretyachenko Ya.S. Tikhomirova Phlogopite in mantle xenoliths and kimberlite from the Grib pipe, Arkhangelsk province, Russia: Evidence for multi-stage mantle metasomatism and origin of phlogopite in kimberlite |
topic_facet |
Geology QE1-996.5 |
description |
We present petrography and mineral chemistry for both phlogopite, from mantle-derived xenoliths (garnet peridotite, eclogite and clinopyroxene–phlogopite rocks) and for megacryst, macrocryst and groundmass flakes from the Grib kimberlite in the Arkhangelsk diamond province of Russia to provide new insights into multi-stage metasomatism in the subcratonic lithospheric mantle (SCLM) and the origin of phlogopite in kimberlite. Based on the analysed xenoliths, phlogopite is characterized by several generations. The first generation (Phl1) occurs as coarse, discrete grains within garnet peridotite and eclogite xenoliths and as a rock-forming mineral within clinopyroxene–phlogopite xenoliths. The second phlogopite generation (Phl2) occurs as rims and outer zones that surround the Phl1 grains and as fine flakes within kimberlite-related veinlets filled with carbonate, serpentine, chlorite and spinel. In garnet peridotite xenoliths, phlogopite occurs as overgrowths surrounding garnet porphyroblasts, within which phlogopite is associated with Cr-spinel and minor carbonate. In eclogite xenoliths, phlogopite occasionally associates with carbonate bearing veinlet networks. Phlogopite, from the kimberlite, occurs as megacrysts, macrocrysts, microcrysts and fine flakes in the groundmass and matrix of kimberlitic pyroclasts. Most phlogopite grains within the kimberlite are characterised by signs of deformation and form partly fragmented grains, which indicates that they are the disintegrated fragments of previously larger grains.Phl1, within the garnet peridotite and clinopyroxene–phlogopite xenoliths, is characterised by low Ti and Cr contents (TiO2 < 1 wt.%, Cr2O3 < 1 wt.% and Mg# = 100 × Mg/(Mg + Fe) > 92) typical of primary peridotite phlogopite in mantle peridotite xenoliths from global kimberlite occurrences. They formed during SCLM metasomatism that led to a transformation from garnet peridotite to clinopyroxene–phlogopite rocks and the crystallisation of phlogopite and high-Cr clinopyroxene megacrysts before ... |
format |
Article in Journal/Newspaper |
author |
A.V. Kargin L.V. Sazonova A.A. Nosova N.M. Lebedeva Yu.A. Kostitsyn E.V. Kovalchuk V.V. Tretyachenko Ya.S. Tikhomirova |
author_facet |
A.V. Kargin L.V. Sazonova A.A. Nosova N.M. Lebedeva Yu.A. Kostitsyn E.V. Kovalchuk V.V. Tretyachenko Ya.S. Tikhomirova |
author_sort |
A.V. Kargin |
title |
Phlogopite in mantle xenoliths and kimberlite from the Grib pipe, Arkhangelsk province, Russia: Evidence for multi-stage mantle metasomatism and origin of phlogopite in kimberlite |
title_short |
Phlogopite in mantle xenoliths and kimberlite from the Grib pipe, Arkhangelsk province, Russia: Evidence for multi-stage mantle metasomatism and origin of phlogopite in kimberlite |
title_full |
Phlogopite in mantle xenoliths and kimberlite from the Grib pipe, Arkhangelsk province, Russia: Evidence for multi-stage mantle metasomatism and origin of phlogopite in kimberlite |
title_fullStr |
Phlogopite in mantle xenoliths and kimberlite from the Grib pipe, Arkhangelsk province, Russia: Evidence for multi-stage mantle metasomatism and origin of phlogopite in kimberlite |
title_full_unstemmed |
Phlogopite in mantle xenoliths and kimberlite from the Grib pipe, Arkhangelsk province, Russia: Evidence for multi-stage mantle metasomatism and origin of phlogopite in kimberlite |
title_sort |
phlogopite in mantle xenoliths and kimberlite from the grib pipe, arkhangelsk province, russia: evidence for multi-stage mantle metasomatism and origin of phlogopite in kimberlite |
publisher |
Elsevier |
publishDate |
2019 |
url |
https://doi.org/10.1016/j.gsf.2018.12.006 https://doaj.org/article/bb571ee6ec624d859dfd8f727e394dbd |
genre |
Arkhangelsk |
genre_facet |
Arkhangelsk |
op_source |
Geoscience Frontiers, Vol 10, Iss 5, Pp 1941-1959 (2019) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S167498711930026X https://doaj.org/toc/1674-9871 1674-9871 doi:10.1016/j.gsf.2018.12.006 https://doaj.org/article/bb571ee6ec624d859dfd8f727e394dbd |
op_doi |
https://doi.org/10.1016/j.gsf.2018.12.006 |
container_title |
Geoscience Frontiers |
container_volume |
10 |
container_issue |
5 |
container_start_page |
1941 |
op_container_end_page |
1959 |
_version_ |
1775349055845564416 |