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It is shown that classical epithermal deposits with hydrothermal explosions, brecciated and framework–lamellar (including agate-like) structures, and well-developed bonanzas are usually pre-porphyry in origin. This inference seems to be important for development of the genetic model of a porphyry–epithermal ore-forming system as well as for exploration of gold–silver deposits and assessment of their potential. 相似文献
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Analysis of the spatial relations of gold ore occurrences and the enclosing geological environment in the Chukotka Autonomous Okrug (ChAO) has shown that Au–quartz ore occurrences in turbidites are located predominantly in areas of the Early Cretaceous granitoid magmatism with the thick collision-type continental crust. The Cu–Au porphyry deposits are located in areas with complete development of Early Cretaceous magmatism within the outer zone of the Okhotsk–Chukchi volcanoplutonic belt (OChVB). The Au–Ag epithermal deposits are located in the areas of the Late Cretaceous granitoid magmatism within the inner and outer zones of the OChVB. The prospects of island-arc complexes for searching for Kuroku-type Au-bearing ore objects are available. 相似文献
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N. V. Zubkova I. V. Pekov D. A. Ksenofontov V. O. Yapaskurt D. Yu. Pushcharovsky E. G. Sidorov 《Doklady Earth Sciences》2018,479(1):339-341
The crystal structure (R = 0.0194) of arcanite β-K2SO4 was studied on a single crystal from exhalations of the Arsenatnaya fumarole, Tolbachik Volcano (Kamchatka, Russia). The mineral crystallizes at a temperature of ≥350–430°C and associates with langbeinite, aphthitalite, hematite, tenorite, johillerite, and others. Arcanite is orthorhombic, Pnma, a = 7.4763(2) Å, b = 5.77262(16) Å, c = 10.0630(3) Å, V = 434.30(2) Å3, Z = 4. Its structure contains isolated SO4 tetrahedra, whereas K cations center ten- and nine-fold polyhedra. 相似文献
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Volkov A. V. Novikov I. A. Razumovskiy A. A. Murashov K. Yu. Sidorova N. V. Sidorov A. A. 《Doklady Earth Sciences》2018,479(1):393-396
The new geochemical data obtained of cupriferous sandstones of the Orenburg area of the Ural region show that the Permian host stratum could have served as the source of rare-earth elements and other microelements for the ore-forming fluids. They confirm the possibility of using a convection model to explain the genesis of the copper ores studied. This model indicates the likely multistage development of mineralization to significant depths, like in the Manto deposits in Chili. Consequently, the Permian cupriferous sandstones of the southwestern area of the Ural region can be considered a very promising source of raw material for the development of copper industry in the area.
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Malakhova T. V. Kanapatskiy T. A. Sidorov I. G. Rusanov I. I. Malakhova L. V. Proskurnin V. Yu. Pimenov N. V. 《Oceanology》2018,58(6):909-917
Oceanology - A seasonal study of microbial methane oxidation (MO) and sulfate reduction (SR) processes in bottom sediments was carried out at five stations in the estuarian Sevastopol coastal area,... 相似文献
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