Academic Journal
Syndeformation Chrome Spinels Inclusions in the Plastically Deformed Olivine Aggregates (Kraka Ophiolites, the Southern Urals)
| العنوان: | Syndeformation Chrome Spinels Inclusions in the Plastically Deformed Olivine Aggregates (Kraka Ophiolites, the Southern Urals) |
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| المؤلفون: | D. E. Saveliev, I. A. Blinov |
| المصدر: | Vestnik Permskogo Universiteta: Seriâ Geologiâ, Vol 4, Iss 29, Pp 44-69 (2015) |
| بيانات النشر: | Perm Sate National Research University, 2015. |
| سنة النشر: | 2015 |
| المجموعة: | LCC:Geology |
| مصطلحات موضوعية: | ультрамафиты, хромититы, пластическая деформация, петроструктура оливина, сегрегация, коалесценция, реоморфизм, Южный Урал, Крака, Geology, QE1-996.5 |
| الوصف: | This article presents the results of structural, petrographic, mineralogical and chemical studies of dunite veinlets in spinel peridotite from the Kraka ophiolites. It is demonstrated that plastic deformation of polycrystalline olivine, which form dunite, was accompanied by precipitation of impurities (aluminum and chrome) as newly formed chrome spinels. The thinnest acicular inclusions of 0.3-0.5 micron thick are aligned in olivine grains along [010] axis. Bigger elongated irregular chrome spinel grains usually occur along grain and sub-grain olivine boundaries, and, occasionally, inside the grains along [100] axis. Alteration from the fine xenomorphic grains of chrome spinels to the bigger idiomorphic crystals was observed. Analogically to dynamic ageing (dispersion hardening) in metals, the structural and chemical alterations in dunites are interpreted as deformation induced segregation of impurities. It is suggested that the euhedral chrome spinel grains typical for ophiolitic dunites were formed by coalescence and spheroidization. This process may be a key factor in the formation of ophiolitic chrome ore deposits. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English Russian |
| تدمد: | 1994-3601 2313-4798 |
| Relation: | http://geology-vestnik.psu.ru/index.php/geology/article/view/96; https://doaj.org/toc/1994-3601; https://doaj.org/toc/2313-4798 |
| URL الوصول: | https://doaj.org/article/33f1392c1f3e4936b68bc44917f08a4b |
| رقم الانضمام: | edsdoj.33f1392c1f3e4936b68bc44917f08a4b |
| قاعدة البيانات: | Directory of Open Access Journals |
| تدمد: | 19943601 23134798 |
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