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Сlinopyroxen in the eclogite-blueschist complexes: structural signs of the conditions of its formationстатья
- Авторы: Fedkin V.V., Sipaina L.V.
- Журнал: Experiment in GeoSciences
- Том: 26
- Номер: 1
- Год издания: 2020
- Первая страница: 54
- Последняя страница: 58
- Аннотация: Abstract. Nuclear gamma resonance (NGR) and X-raypowder diffractometry (XRD) methods have been used tostudy the fine structural organization of omphacite, one ofthe main indicators of metamorphism conditions. A detailedstudy of clinopyroxenes from eclogites of the Atbashy(South Tien Shan) and Maksyutov (South Urals)complexes, contrasting in depth, allows comparing thefeatures of local fields in the mineral structure and relatingthem to the physicochemical conditions of the complexesformation. In the At-47 omphacite from the eclogite of theAtbashy complex, along with the M1 doublet, known forhedenbergite, the configurations typical for diopside (M1adoublet) are more noticeable, and the Maksyutov eclogitesample Mks-110 is characterized by the M1b jadeitedoublet. The presence in the spectrum of the lastomphacite of a significant fraction of M1 polyhedra (M1bdoublet) with parameters characteristic of the highpressurenon-preserved structure of clinoferrosilite andjadeite can be a sign of the high-pressure origin of thestudied omphacites. The data obtained confirm thepresence of a mutual ordering effect at the M1 and M2positions of cations with a contrasting size and differentcharge, which is expected for omphacite. Direct evidenceof the preference for local configurations of M3 + (M1) -M1 + (M2) clarifies the physical motives of the cationordering during pyroxene transformations associated witha change in their local electronic structure. An analysis ofthe results for the first time reveals the important role ofthe boundaries of the topological stability of pyroxenestructures in their transformations at high pressures andmakes it promising to use the identified features to assessthe depth of formation of the eclogite-blueschistcomplexes.
- Добавил в систему: Федькин Валентин Васильевич
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | Fedkin_Sipavina_Khit-20en.doc | 109,0 КБ | 27 октября 2020 [Fedkin] | |
| 2. | Полный текст | Fed-Sip_Khit-20.pdf | 3,2 МБ | 9 декабря 2020 [Fedkin] |