دورية أكاديمية
Rocks of the Ary-Bulak Ongonite Massif: Relationship between Geochemical Features, Mineral-Phase Assemblages, and Formation Processes.
العنوان: | Rocks of the Ary-Bulak Ongonite Massif: Relationship between Geochemical Features, Mineral-Phase Assemblages, and Formation Processes. |
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المؤلفون: | Peretyazhko, I. S., Savina, E. A., Dmitrieva, A. S. |
المصدر: | Petrology; Jun2024, Vol. 32 Issue 3, p359-385, 27p |
مصطلحات موضوعية: | RUBIDIUM, ROCK-forming minerals, CASSITERITE, GEOCHEMISTRY, MINERALS, TRACE elements |
مستخلص: | The paper reports the study of geochemistry, mineral-phase assemblages of rocks of the Ary-Bulak ongonite massif, compositions of major, minor and accessory minerals (quartz, feldspars, topaz, zinnwaldite, prosopite, rare Ca–Al-fluorides, W-ixiolite, columbite, zircon, cassiterite, and fluocerite), fluoride–calcium (F–Ca) phase, and fluorite formed from it. The rock-forming minerals of porphyritic ongonites are quartz, albite and sanidine, and minor minerals are topaz and zinnwaldite. The ongonitic matrix is composed of a quartz–sanidine–albite assemblage with micron-sized needle-shaped topaz crystals. In transitional porphyritic rocks and in the endocontact aphyric zone, the interstices between matrix minerals are filled with a F–Ca phase formed from a F–Ca (fluoritic) stoichiometric melt. Fluoride–silicate liquid immiscibility in ongonitic magma and fluid-magmatic processes led to the redistribution of REE, Y, and many trace elements between melts, fluids, minerals and a contrasting change in mineral-phase assemblages in the rocks. This is associated with the appearance of M-type (T |
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قاعدة البيانات: | Complementary Index |
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