Formation Sequence of Different Spinel Species in Megacrystalline Peridotites of the Udachnaya-East Kimberlite Pipe (Yakutia): Evidence for the Metasomatism of Depleted Mantle
The large compositional variations in spinels from extremely depleted, megacrystalline harzburgite−dunites in the Udachnaya-East kimberlite pipe, Yakutia, apparently reflect multistage metasomatism. Changes in the redox regime are reflected in the compositions of different parts of mineral grains. F...
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ftdoajarticles:oai:doaj.org/article:8224d6cd692b4642bdb6df5225bda843 2023-05-15T18:44:54+02:00 Formation Sequence of Different Spinel Species in Megacrystalline Peridotites of the Udachnaya-East Kimberlite Pipe (Yakutia): Evidence for the Metasomatism of Depleted Mantle Lyudmila Pokhilenko 2019-10-01T00:00:00Z https://doi.org/10.3390/min9100607 https://doaj.org/article/8224d6cd692b4642bdb6df5225bda843 EN eng MDPI AG https://www.mdpi.com/2075-163X/9/10/607 https://doaj.org/toc/2075-163X 2075-163X doi:10.3390/min9100607 https://doaj.org/article/8224d6cd692b4642bdb6df5225bda843 Minerals, Vol 9, Iss 10, p 607 (2019) spinel megacrystalline harzburgite–dunite kimberlite mantle metasomatism kelyphitic rim Mineralogy QE351-399.2 article 2019 ftdoajarticles https://doi.org/10.3390/min9100607 2022-12-31T15:39:29Z The large compositional variations in spinels from extremely depleted, megacrystalline harzburgite−dunites in the Udachnaya-East kimberlite pipe, Yakutia, apparently reflect multistage metasomatism. Changes in the redox regime are reflected in the compositions of different parts of mineral grains. From most reduced to most oxidized, spinel compositions divide into: (1) primary (rock-forming) Cr-spinel and spinel from the central parts of sulfide grains, (2) spinel from microcracks in olivine, (3) spinel in kelyphitic rim around garnet between garnet and olivine (Rim1 and Rim2 spinel), and (4) spinel in transformed kelyphitic rim around garnet between garnet and kimberlite (Rim3 spinel). P-T conditions for the vast majority of samples, calculated using the composition of primary Cr-spinel, fall in the diamond stability field. A change in the composition of spinels of different generations occurs along the sides of the classical triangle of spinel compositions Al−Cr−Fe 3+ : (1) Rim2 to Rim1 spinel—Al−Cr trend, (2) primary Cr-spinel to magnetite rim in the edge—Cr−Fe 3+ (kimberlite) trend, (3) replacing Rim1 to Rim3—Al−Fe 3+ trend. Article in Journal/Newspaper Yakutia Directory of Open Access Journals: DOAJ Articles Minerals 9 10 607 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
spinel megacrystalline harzburgite–dunite kimberlite mantle metasomatism kelyphitic rim Mineralogy QE351-399.2 |
spellingShingle |
spinel megacrystalline harzburgite–dunite kimberlite mantle metasomatism kelyphitic rim Mineralogy QE351-399.2 Lyudmila Pokhilenko Formation Sequence of Different Spinel Species in Megacrystalline Peridotites of the Udachnaya-East Kimberlite Pipe (Yakutia): Evidence for the Metasomatism of Depleted Mantle |
topic_facet |
spinel megacrystalline harzburgite–dunite kimberlite mantle metasomatism kelyphitic rim Mineralogy QE351-399.2 |
description |
The large compositional variations in spinels from extremely depleted, megacrystalline harzburgite−dunites in the Udachnaya-East kimberlite pipe, Yakutia, apparently reflect multistage metasomatism. Changes in the redox regime are reflected in the compositions of different parts of mineral grains. From most reduced to most oxidized, spinel compositions divide into: (1) primary (rock-forming) Cr-spinel and spinel from the central parts of sulfide grains, (2) spinel from microcracks in olivine, (3) spinel in kelyphitic rim around garnet between garnet and olivine (Rim1 and Rim2 spinel), and (4) spinel in transformed kelyphitic rim around garnet between garnet and kimberlite (Rim3 spinel). P-T conditions for the vast majority of samples, calculated using the composition of primary Cr-spinel, fall in the diamond stability field. A change in the composition of spinels of different generations occurs along the sides of the classical triangle of spinel compositions Al−Cr−Fe 3+ : (1) Rim2 to Rim1 spinel—Al−Cr trend, (2) primary Cr-spinel to magnetite rim in the edge—Cr−Fe 3+ (kimberlite) trend, (3) replacing Rim1 to Rim3—Al−Fe 3+ trend. |
format |
Article in Journal/Newspaper |
author |
Lyudmila Pokhilenko |
author_facet |
Lyudmila Pokhilenko |
author_sort |
Lyudmila Pokhilenko |
title |
Formation Sequence of Different Spinel Species in Megacrystalline Peridotites of the Udachnaya-East Kimberlite Pipe (Yakutia): Evidence for the Metasomatism of Depleted Mantle |
title_short |
Formation Sequence of Different Spinel Species in Megacrystalline Peridotites of the Udachnaya-East Kimberlite Pipe (Yakutia): Evidence for the Metasomatism of Depleted Mantle |
title_full |
Formation Sequence of Different Spinel Species in Megacrystalline Peridotites of the Udachnaya-East Kimberlite Pipe (Yakutia): Evidence for the Metasomatism of Depleted Mantle |
title_fullStr |
Formation Sequence of Different Spinel Species in Megacrystalline Peridotites of the Udachnaya-East Kimberlite Pipe (Yakutia): Evidence for the Metasomatism of Depleted Mantle |
title_full_unstemmed |
Formation Sequence of Different Spinel Species in Megacrystalline Peridotites of the Udachnaya-East Kimberlite Pipe (Yakutia): Evidence for the Metasomatism of Depleted Mantle |
title_sort |
formation sequence of different spinel species in megacrystalline peridotites of the udachnaya-east kimberlite pipe (yakutia): evidence for the metasomatism of depleted mantle |
publisher |
MDPI AG |
publishDate |
2019 |
url |
https://doi.org/10.3390/min9100607 https://doaj.org/article/8224d6cd692b4642bdb6df5225bda843 |
genre |
Yakutia |
genre_facet |
Yakutia |
op_source |
Minerals, Vol 9, Iss 10, p 607 (2019) |
op_relation |
https://www.mdpi.com/2075-163X/9/10/607 https://doaj.org/toc/2075-163X 2075-163X doi:10.3390/min9100607 https://doaj.org/article/8224d6cd692b4642bdb6df5225bda843 |
op_doi |
https://doi.org/10.3390/min9100607 |
container_title |
Minerals |
container_volume |
9 |
container_issue |
10 |
container_start_page |
607 |
_version_ |
1766235744875053056 |