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排序方式： 共有54条查询结果，搜索用时 15 毫秒
1.
G. S. Ripp I. A. Izbrodin E. I. Lastochkin A. G. Doroshkevich M. O. Rampilov V. F. Posokhov 《Geochemistry International》2016,54(9):748-764
Isotope-geochemical study of the Ermakovskoe fluorine–beryllium deposit was carried out to estimate the ore sources and role of host carbonate rocks in its formation. We analyzed oxygen and carbon isotope compositions in marbles, skarn carbonates, ore and post-ore parageneses; oxygen isotope compositions in oxides, silicates, apatite; and sulfur isotope composition in sulfides and sulfates. Sources of fluids participating in the rock and ore formation were determined using hydrogen and oxygen isotope compositions in hydroxyl-bearing minerals: phlogopite from marbles, vesuvian from skarns, eudidymite and bertrandite from ore parageneses, and bavenite of the post-ore stage. Isotopic studies suggest crustal source of sulfur, oxygen, and carbon dioxide, while oxygen and hydrogen isotope compositions in the hydroxyl-bearing minerals points to the contribution of meteoric waters in the formation of the fluorine-beryllium ores. 相似文献
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G. S. Ripp A. G. Doroshkevich M. V. Badmatsyrenov N. S. Karmanov 《Geochemistry International》2007,45(6):538-545
The composition and nature of high-Cr minerals in lithic clasts from the carbonatites of the Veseloe occurrence, northern Transbaikalia, were considered. In order to determine their source, the Cr-bearing phases were compared with chromite, magnetite, and rutile from ultrabasic rocks, mantle xenoliths, and eclogites. It was suggested that the xenoclasts studied were formed at great depths, whereas the carbonatites were directly derived from the mantle rather than formed by the crustal differentiation of a silicate-carbonate melt. 相似文献
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Astronomy Reports - A comparison of the virial parameters of galaxies and galaxy clusters (radius, density, and entropy function) in a wide range of masses, $${{10}^{6}} \leqslant... 相似文献
8.
D. I. Novikov A. G. Doroshkevich I. D. Novikov A. A. Shatskii 《Astronomy Reports》2009,53(12):1079-1085
Physical processes arising when an impermeable wormhole is irradiated by self-gravitating, exotic radiation are considered.
It is shown that, in this case, the conditions required for the passage of signals fromanother universe into our own arise
only in our Universe, whereas signals cannot pass through the wormhole in the opposite direction. Such wormholes are called
semi-permeable. The stability of a static wormhole filled with radial magnetic field and exotic dust with a negative energy
density is also considered. 相似文献
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A U-Pb (SHRIMP-II) geochronological study of rocks from the Sayzhenski, Snezhny and Nizhne-Burulzayski massifs, incorporated
into the Vitim alkali province (Sayzhenski Complex) has been made. The acquired data indicate that the rocks formed in the
interval of 520-486 Ma. The proximity of their age to accretionary-collision processes in the Central Asian fold belt, accompanied
by intràplate magmatism, has been noted. Two independent stages in the evolution of Vitim Province magmatism are suggested:
Early Paleozoic (520-485 Ma) and Late Paleozoic (350-290 Ma). 相似文献
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