Alakit and Daldyn kimberlite fields, Siberia, Russia: Two types of mantle sub-terranes beneath central Yakutia?
Mineral data from Yakutian kimberlites allow reconstruction of the history of lithospheric mantle. Differences occur in compositions of mantle pyropes and clinopyroxenes from large kimberlite pipes in the Alakit and Daldyn fields. In the Alakit field, Cr-diopsides are alkaline, and Stykanskaya and s...
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ftbirkbeckcoll:oai:eprints.bbk.ac.uk.oai2:18171 2023-05-15T18:45:10+02:00 Alakit and Daldyn kimberlite fields, Siberia, Russia: Two types of mantle sub-terranes beneath central Yakutia? Ashchepkov, I.V. Logvinova, A.M. Ntaflos, T. Vladykin, N.V. Kostrovitsky, S.I. Spetsius, Z. Mityukhin, S.I. Prokopyev, S.A. Medvedev, N.S. Downes, Hilary 2017-07 text https://eprints.bbk.ac.uk/id/eprint/18171/ https://eprints.bbk.ac.uk/id/eprint/18171/1/18171.pdf https://doi.org/10.1016/j.gsf.2016.08.004 en eng Elsevier https://eprints.bbk.ac.uk/id/eprint/18171/1/18171.pdf Ashchepkov, I.V. and Logvinova, A.M. and Ntaflos, T. and Vladykin, N.V. and Kostrovitsky, S.I. and Spetsius, Z. and Mityukhin, S.I. and Prokopyev, S.A. and Medvedev, N.S. and Downes, Hilary (2017) Alakit and Daldyn kimberlite fields, Siberia, Russia: Two types of mantle sub-terranes beneath central Yakutia? Geoscience Frontiers 8 (4), pp. 671-692. ISSN 1674-9871. cc_by_4 CC-BY Earth and Planetary Sciences Article PeerReviewed 2017 ftbirkbeckcoll https://doi.org/10.1016/j.gsf.2016.08.004 2022-01-09T09:00:05Z Mineral data from Yakutian kimberlites allow reconstruction of the history of lithospheric mantle. Differences occur in compositions of mantle pyropes and clinopyroxenes from large kimberlite pipes in the Alakit and Daldyn fields. In the Alakit field, Cr-diopsides are alkaline, and Stykanskaya and some other pipes contain more sub-calcic pyropes and dunitic-type diamond inclusions, while in the Daldyn field harzburgitic pyropes are frequent. The eclogitic diamond inclusions in the Alakit field are sharply divided in types and conditions, while in the Daldyn field they show varying compositions and often continuous Pressure–Temperature (P–T) ranges with increasing Fe# with decreasing pressures. In Alakit, Cr-pargasites to richterites were found in all pipes, while in Daldyn, pargasites are rare Dalnyaya and Zarnitsa pipes. Cr-diopsides from the Alakit region show higher levels of light Rare Earth Elements (LREE) and stronger REE-slopes, and enrichment in light Rare Earth Elements (LREE), sometimes Th-U, and small troughs in Nb-Ta-Zr. In the Daldyn field, the High Field Strength Elements HFSE troughs are more common in clinopyroxenes with low REE abundances, while those from sheared and refertilized peridotites have smooth patterns. Garnets from Alakit show HREE minima, but those from Daldyn often have a trough at Y and high U and Pb. PTXfO2 diagrams from both regions show similarities, suggesting similar layering and structures. The degree of metasomatism is often higher for pipes which show dispersion in P–Fe# trends for garnets. In the mantle beneath Udachnaya and Aykhal, pipes show 6–7 linear arrays of P–Fe# in the lower part of the mantle section at 7.5–3.0 GPa, probably reflecting primary subduction horizons. Beneath the Sytykanskaya pipe, there are several horizons with opposite inclinations which reflect metasomatic processes. The high dispersion of the P–Fe# trend indicating widespread metasomatism is associated with decreased diamond grades. Possible explanation of the differences in mineralogy and geochemistry of the mantle sections may relate to their tectonic positions during growth of the lithospheric keel. Enrichment in volatiles and alkalis possibly corresponds to interaction with subduction-related fluids and melts in the craton margins. Incorporation of island arc peridotites from an eroded arc is a possible scenario. Article in Journal/Newspaper Yakutia Siberia BIROn - Birkbeck Institutional Research Online (Birkbeck University of London) Alakit ENVELOPE(110.633,110.633,66.133,66.133) Aykhal ENVELOPE(111.483,111.483,65.934,65.934) Geoscience Frontiers 8 4 671 692 |
institution |
Open Polar |
collection |
BIROn - Birkbeck Institutional Research Online (Birkbeck University of London) |
op_collection_id |
ftbirkbeckcoll |
language |
English |
topic |
Earth and Planetary Sciences |
spellingShingle |
Earth and Planetary Sciences Ashchepkov, I.V. Logvinova, A.M. Ntaflos, T. Vladykin, N.V. Kostrovitsky, S.I. Spetsius, Z. Mityukhin, S.I. Prokopyev, S.A. Medvedev, N.S. Downes, Hilary Alakit and Daldyn kimberlite fields, Siberia, Russia: Two types of mantle sub-terranes beneath central Yakutia? |
topic_facet |
Earth and Planetary Sciences |
description |
Mineral data from Yakutian kimberlites allow reconstruction of the history of lithospheric mantle. Differences occur in compositions of mantle pyropes and clinopyroxenes from large kimberlite pipes in the Alakit and Daldyn fields. In the Alakit field, Cr-diopsides are alkaline, and Stykanskaya and some other pipes contain more sub-calcic pyropes and dunitic-type diamond inclusions, while in the Daldyn field harzburgitic pyropes are frequent. The eclogitic diamond inclusions in the Alakit field are sharply divided in types and conditions, while in the Daldyn field they show varying compositions and often continuous Pressure–Temperature (P–T) ranges with increasing Fe# with decreasing pressures. In Alakit, Cr-pargasites to richterites were found in all pipes, while in Daldyn, pargasites are rare Dalnyaya and Zarnitsa pipes. Cr-diopsides from the Alakit region show higher levels of light Rare Earth Elements (LREE) and stronger REE-slopes, and enrichment in light Rare Earth Elements (LREE), sometimes Th-U, and small troughs in Nb-Ta-Zr. In the Daldyn field, the High Field Strength Elements HFSE troughs are more common in clinopyroxenes with low REE abundances, while those from sheared and refertilized peridotites have smooth patterns. Garnets from Alakit show HREE minima, but those from Daldyn often have a trough at Y and high U and Pb. PTXfO2 diagrams from both regions show similarities, suggesting similar layering and structures. The degree of metasomatism is often higher for pipes which show dispersion in P–Fe# trends for garnets. In the mantle beneath Udachnaya and Aykhal, pipes show 6–7 linear arrays of P–Fe# in the lower part of the mantle section at 7.5–3.0 GPa, probably reflecting primary subduction horizons. Beneath the Sytykanskaya pipe, there are several horizons with opposite inclinations which reflect metasomatic processes. The high dispersion of the P–Fe# trend indicating widespread metasomatism is associated with decreased diamond grades. Possible explanation of the differences in mineralogy and geochemistry of the mantle sections may relate to their tectonic positions during growth of the lithospheric keel. Enrichment in volatiles and alkalis possibly corresponds to interaction with subduction-related fluids and melts in the craton margins. Incorporation of island arc peridotites from an eroded arc is a possible scenario. |
format |
Article in Journal/Newspaper |
author |
Ashchepkov, I.V. Logvinova, A.M. Ntaflos, T. Vladykin, N.V. Kostrovitsky, S.I. Spetsius, Z. Mityukhin, S.I. Prokopyev, S.A. Medvedev, N.S. Downes, Hilary |
author_facet |
Ashchepkov, I.V. Logvinova, A.M. Ntaflos, T. Vladykin, N.V. Kostrovitsky, S.I. Spetsius, Z. Mityukhin, S.I. Prokopyev, S.A. Medvedev, N.S. Downes, Hilary |
author_sort |
Ashchepkov, I.V. |
title |
Alakit and Daldyn kimberlite fields, Siberia, Russia: Two types of mantle sub-terranes beneath central Yakutia? |
title_short |
Alakit and Daldyn kimberlite fields, Siberia, Russia: Two types of mantle sub-terranes beneath central Yakutia? |
title_full |
Alakit and Daldyn kimberlite fields, Siberia, Russia: Two types of mantle sub-terranes beneath central Yakutia? |
title_fullStr |
Alakit and Daldyn kimberlite fields, Siberia, Russia: Two types of mantle sub-terranes beneath central Yakutia? |
title_full_unstemmed |
Alakit and Daldyn kimberlite fields, Siberia, Russia: Two types of mantle sub-terranes beneath central Yakutia? |
title_sort |
alakit and daldyn kimberlite fields, siberia, russia: two types of mantle sub-terranes beneath central yakutia? |
publisher |
Elsevier |
publishDate |
2017 |
url |
https://eprints.bbk.ac.uk/id/eprint/18171/ https://eprints.bbk.ac.uk/id/eprint/18171/1/18171.pdf https://doi.org/10.1016/j.gsf.2016.08.004 |
long_lat |
ENVELOPE(110.633,110.633,66.133,66.133) ENVELOPE(111.483,111.483,65.934,65.934) |
geographic |
Alakit Aykhal |
geographic_facet |
Alakit Aykhal |
genre |
Yakutia Siberia |
genre_facet |
Yakutia Siberia |
op_relation |
https://eprints.bbk.ac.uk/id/eprint/18171/1/18171.pdf Ashchepkov, I.V. and Logvinova, A.M. and Ntaflos, T. and Vladykin, N.V. and Kostrovitsky, S.I. and Spetsius, Z. and Mityukhin, S.I. and Prokopyev, S.A. and Medvedev, N.S. and Downes, Hilary (2017) Alakit and Daldyn kimberlite fields, Siberia, Russia: Two types of mantle sub-terranes beneath central Yakutia? Geoscience Frontiers 8 (4), pp. 671-692. ISSN 1674-9871. |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1016/j.gsf.2016.08.004 |
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