Инд. авторы: | Bazhan I.S., Litasov K.D., Badyukov D.D. |
Заглавие: | High-Pressure Phases in the Dhofar 922 L6 Chondrite: Crystallization of Olivine-Ringwoodite Aggregates and Jadeite from Melt |
Библ. ссылка: | Bazhan I.S., Litasov K.D., Badyukov D.D. High-Pressure Phases in the Dhofar 922 L6 Chondrite: Crystallization of Olivine-Ringwoodite Aggregates and Jadeite from Melt // Russian Geology and Geophysics. - 2020. - Vol.61. - Iss. 3. - P.241-249. - ISSN 1068-7971. - EISSN 1878-030X. |
Внешние системы: | DOI: 10.15372/RGG2019072; SCOPUS: 2-s2.0-85089019780; WoS: 000521567400001; |
Реферат: | eng: 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 similar to 600 and similar to 700 degrees C, respectively. The P-T conditions of the formation of shock-melt veins are estimated at >19 GPa and >2150-2300 degrees C.
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Ключевые слова: | POLYMORPHS; MECHANISMS; TRANSFORMATIONS; VEINS; MINERALS; MODIFIED SPINEL; CALORIMETRIC MEASUREMENTS; STABILITY; shock metamorphism; maskelynite; jadeite; majorite; ringwoodite; chondrite; meteorite; SYSTEM MG2SIO4-FE2SIO4; HOLLANDITE; |
Издано: | 2020 |
Физ. характеристика: | с.241-249 |