Petrologic origin of exsolution textures in mantle minerals: evidence in pyroxenitic xenoliths from Yakutia kimberlites
Exsolution lamellae in pyroxene and garnet porphyroblasts in pyroxenite xenoliths from the Mir, Udachnaya, and Obnazhennaya kimberlites (Siberian Craton) reveal a diverse suite of exsolved phases, including oxides (spinels, ilmenite, rutile, and chromite), pyroxene, and garnet. Textural characterist...
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ftuglasgow:oai:eprints.gla.ac.uk:167122 2023-05-15T18:45:05+02:00 Petrologic origin of exsolution textures in mantle minerals: evidence in pyroxenitic xenoliths from Yakutia kimberlites Alifirova, Taisia Aleksandrovna Pokhilenko, Lyudmila Nikolaevna Ovchinnikov, Yuriy Ivanovich Donnelly, Cara Lyhn Riches, Amy J.V. Taylor, Lawrence August 2012 http://eprints.gla.ac.uk/167122/ unknown Taylor & Francis Alifirova, T. A., Pokhilenko, L. N., Ovchinnikov, Y. I., Donnelly, C. L., Riches, A. J.V. <http://eprints.gla.ac.uk/view/author/47144.html> and Taylor, L. A. (2012) Petrologic origin of exsolution textures in mantle minerals: evidence in pyroxenitic xenoliths from Yakutia kimberlites. International Geology Review <http://eprints.gla.ac.uk/view/journal_volume/International_Geology_Review.html>, 54(9), pp. 1071-1092. (doi:10.1080/00206814.2011.623011 <http://dx.doi.org/10.1080/00206814.2011.623011>) Articles PeerReviewed 2012 ftuglasgow https://doi.org/10.1080/00206814.2011.623011 2020-01-10T01:42:51Z Exsolution lamellae in pyroxene and garnet porphyroblasts in pyroxenite xenoliths from the Mir, Udachnaya, and Obnazhennaya kimberlites (Siberian Craton) reveal a diverse suite of exsolved phases, including oxides (spinels, ilmenite, rutile, and chromite), pyroxene, and garnet. Textural characteristics suggest that exsolved phases progressively increased in volumetric proportions, and in some cases, the bulk xenoliths transformed from a lithology dominated by coarse grains (i.e. > 2 cm; megacrystalline) to a significantly finer-grained texture (i.e. < 1 cm). These exsolved lamellae are the result of a complex and protracted sub solidus history following magmatic crystallization. Equilibrium pressure–temperature estimates place these xenoliths at low-to-moderate pressure–temperature conditions (690–910°C and 2.0–4.5 GPa) in the lithospheric mantle at the time of entrainment in the kimberlite. However, reconstructed compositions of initial pyroxene and garnet crystals suggest that this suite of pyroxenites formed at considerably higher temperatures and pressures that, in some instances, may have approached the majorite stability field. Pyroxenites that do not contain primary garnet may have been derived from shallower depths. Progressive exsolution in these pyroxenites is of importance inasmuch as such processes can permit localized changes in rheological properties and may also accommodate strain within portions of lithospheric mantle. Because most xenolith studies focus on peridotites and eclogites, the pyroxenite sample suite studied in this work represents an important contribution towards a greater understanding of the Siberian lithospheric mantle. Article in Journal/Newspaper Yakutia University of Glasgow: Enlighten - Publications International Geology Review 54 9 1071 1092 |
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University of Glasgow: Enlighten - Publications |
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ftuglasgow |
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Exsolution lamellae in pyroxene and garnet porphyroblasts in pyroxenite xenoliths from the Mir, Udachnaya, and Obnazhennaya kimberlites (Siberian Craton) reveal a diverse suite of exsolved phases, including oxides (spinels, ilmenite, rutile, and chromite), pyroxene, and garnet. Textural characteristics suggest that exsolved phases progressively increased in volumetric proportions, and in some cases, the bulk xenoliths transformed from a lithology dominated by coarse grains (i.e. > 2 cm; megacrystalline) to a significantly finer-grained texture (i.e. < 1 cm). These exsolved lamellae are the result of a complex and protracted sub solidus history following magmatic crystallization. Equilibrium pressure–temperature estimates place these xenoliths at low-to-moderate pressure–temperature conditions (690–910°C and 2.0–4.5 GPa) in the lithospheric mantle at the time of entrainment in the kimberlite. However, reconstructed compositions of initial pyroxene and garnet crystals suggest that this suite of pyroxenites formed at considerably higher temperatures and pressures that, in some instances, may have approached the majorite stability field. Pyroxenites that do not contain primary garnet may have been derived from shallower depths. Progressive exsolution in these pyroxenites is of importance inasmuch as such processes can permit localized changes in rheological properties and may also accommodate strain within portions of lithospheric mantle. Because most xenolith studies focus on peridotites and eclogites, the pyroxenite sample suite studied in this work represents an important contribution towards a greater understanding of the Siberian lithospheric mantle. |
format |
Article in Journal/Newspaper |
author |
Alifirova, Taisia Aleksandrovna Pokhilenko, Lyudmila Nikolaevna Ovchinnikov, Yuriy Ivanovich Donnelly, Cara Lyhn Riches, Amy J.V. Taylor, Lawrence August |
spellingShingle |
Alifirova, Taisia Aleksandrovna Pokhilenko, Lyudmila Nikolaevna Ovchinnikov, Yuriy Ivanovich Donnelly, Cara Lyhn Riches, Amy J.V. Taylor, Lawrence August Petrologic origin of exsolution textures in mantle minerals: evidence in pyroxenitic xenoliths from Yakutia kimberlites |
author_facet |
Alifirova, Taisia Aleksandrovna Pokhilenko, Lyudmila Nikolaevna Ovchinnikov, Yuriy Ivanovich Donnelly, Cara Lyhn Riches, Amy J.V. Taylor, Lawrence August |
author_sort |
Alifirova, Taisia Aleksandrovna |
title |
Petrologic origin of exsolution textures in mantle minerals: evidence in pyroxenitic xenoliths from Yakutia kimberlites |
title_short |
Petrologic origin of exsolution textures in mantle minerals: evidence in pyroxenitic xenoliths from Yakutia kimberlites |
title_full |
Petrologic origin of exsolution textures in mantle minerals: evidence in pyroxenitic xenoliths from Yakutia kimberlites |
title_fullStr |
Petrologic origin of exsolution textures in mantle minerals: evidence in pyroxenitic xenoliths from Yakutia kimberlites |
title_full_unstemmed |
Petrologic origin of exsolution textures in mantle minerals: evidence in pyroxenitic xenoliths from Yakutia kimberlites |
title_sort |
petrologic origin of exsolution textures in mantle minerals: evidence in pyroxenitic xenoliths from yakutia kimberlites |
publisher |
Taylor & Francis |
publishDate |
2012 |
url |
http://eprints.gla.ac.uk/167122/ |
genre |
Yakutia |
genre_facet |
Yakutia |
op_relation |
Alifirova, T. A., Pokhilenko, L. N., Ovchinnikov, Y. I., Donnelly, C. L., Riches, A. J.V. <http://eprints.gla.ac.uk/view/author/47144.html> and Taylor, L. A. (2012) Petrologic origin of exsolution textures in mantle minerals: evidence in pyroxenitic xenoliths from Yakutia kimberlites. International Geology Review <http://eprints.gla.ac.uk/view/journal_volume/International_Geology_Review.html>, 54(9), pp. 1071-1092. (doi:10.1080/00206814.2011.623011 <http://dx.doi.org/10.1080/00206814.2011.623011>) |
op_doi |
https://doi.org/10.1080/00206814.2011.623011 |
container_title |
International Geology Review |
container_volume |
54 |
container_issue |
9 |
container_start_page |
1071 |
op_container_end_page |
1092 |
_version_ |
1766236043080630272 |