High-Pressure Phases in the Dhofar 922 L6 Chondrite: Crystallization of Olivine–Ringwoodite Aggregates and Jadeite from Melt-Reference-Cited by-同舟云学术

High-Pressure Phases in the Dhofar 922 L6 Chondrite: Crystallization of Olivine–Ringwoodite Aggregates and Jadeite from Melt

Published:2020-03-01 Issue:3 Volume:61 Page:241-249
ISSN:1068-7971
Container-title:Russian Geology and Geophysics
language:en
Short-container-title:

Author:

Bazhan I.S.¹,Litasov K.D.²³,Badyukov D.D.⁴

Affiliation:

1. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia

2. Vereshchagin Institute for High Pressure Physics, Russian Academy of Sciences, Kaluzhskoe shosse 14, Troitsk, Moscow, 108840, Russia

3. Fersman Mineralogical Museum, Russian Academy of Sciences, Leninsky pr. 18/2, Moscow, 119071, Russia

4. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, ul. Kosygina 19, Moscow, 119991, Russia

Abstract

Abstract —High-pressure phases (ringwoodite, maskelynite, and jadeite) present as coarse-grained fragments in the shock-melt vein of the Dhofar 922 L6 chondrite were studied by scanning electron microscopy and Raman spectroscopy. Ringwoodite and jadeite crystallized from melted plagioclase and olivine fragments, respectively, at the cooling–decompression stage. We assume that the high contents of Fe and Mg in maskelynite–jadeite aggregates are due to a miscibility gap in the hedenbergite–jadeite and diopside–jadeite joins at ~600 and ~700 ºC, respectively. The P–T conditions of the formation of shock-melt veins are estimated at >19 GPa and >2150–2300 ºC.

Publisher

GeoScienceWorld

Subject

Geology,Geophysics

Link

https://pubs.geoscienceworld.org/rgg/article-pdf/61/3/241/5148606/rgg_01_mar2020.pdf