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Spiridonov E. M. Filimonov S. V. Semikolennykh E. S. Korotaeva N. N. Krivitskaya N. N. 《Geology of Ore Deposits》2020,62(7):638-651
Geology of Ore Deposits - Chevkinite-(Се) and perrierite-(Се), which are characteristic minerals of alkaline igneous rocks and high-temperature alkaline alterations, are... 相似文献
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Vsevolod Prokofiev Ivan Baksheev Lidiya Zorin Boris Belyatsky Vladimir Ustinov Nadezhda Krivitskaya 《地学前缘(英文版)》2012,3(1):59-71
Zoned tourmaline（schorl-dravite） in the matrix of hydrothermal explosive breccia and ore veins in gold deposits,Chita region.Eastern Transbaikalia.Russia,are associated with Na- and K-rich porphyry-type subvolcanic intrusives.δ18O values of tourmaline from three gold deposits（Darasun. Talatui,Teremkinskoye） are +8.3‰,+7.6‰,and +6.0‰and calculatedδ18O values of fluids responsible for the tourmalinization are +7.3‰,+7.7‰,and +4.2‰,respectively.These data imply an igneous fluid source,except at the Teremkin deposit where mixing with meteoric water is indicated.Wide ranges of Fe3+/Fetot,and the presence of vacancies characterize the Darasun deposit tourmaline indicating wide ranges of f（O2） and pH of mineralizing fluids.Initial stage tourmalines from the gold deposits of the Darasun ore district are dravite or high mg schorl.Second stage tourmaline is characterized by oscillatory zoning but with Fe generally increasing towards crystal rims indicating decreasing temperature.Third stage tourmaline formed unzoned crystals with xMg（mole fraction of Mg） close to that of the hrst stage tourmaline,due to a close association with pyrite and arsenopyrite.From Fe3+/Fetot values,chemical composition and crystallization temperatures.logf（O2） of mineralizing fluids ranged from ca.—25 to—20. much higher than for the gold-bearing beresite—listvenite association,indicating that tourmalinization was not related to gold mineralization. 相似文献
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V. Yu. Prokofiev I. A. Kalko A. V. Volkov Yu. N. Nikolaev N. N. Krivitskaya A. A. Sidorov 《Doklady Earth Sciences》2018,479(1):310-315
The Au mineralization of Alyarmaut Rise was formed from the ore-forming fluids of two types strongly differing in pressure. The first type of fluid is similar to fluids of the orogenic Au–quartz deposits in terms of the physicochemical parameters and composition. These fluids were formed at a high pressure from heterogeneous, carbon dioxide–aqueous fluids with a low salinity at a depth of 5–7 km. The second type of fluid, which is also heterogeneous, has a shallower origin with a wide range of salinity variation and a small amount of carbon dioxide. This type of fluid is similar to the fluids of epithermal deposits. The wide range of pressure variation characterizing the mineralization of the rise indicates the vertical displacement of the block of the host rocks followed by erosion. Judging by the presence the secondary halos of Au, Ag, As, Sb, Pb, Zn, and Cu in the Upper Paleozoic carbonate–terrigenous rocks of the Alyarmaut Rise, there are prospects to reveal sites with new epithermal Au–Ag mineralization, which are essential for the area and unusual for the Anyui-Chukotka Fold System. 相似文献
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