排序方式： 共有34条查询结果，搜索用时 15 毫秒
1.
2.
A. F. Morozov B. N. Khakhaev O. V. Petrov V. I. Gorbachev G. V. Tarkhanov L. D. Tsvetkov Yu. M. Erinchek A. M. Akhmedov V. A. Krupenik K. Yu. Sveshnikova 《Doklady Earth Sciences》2010,435(1):1483-1486
A thick (200 m) rock salt mass covering Late Archean granitoids was exposed for the first time in the Early Proterozoic volcanogenic-sedimentary
formations in the Onega trough of the east Baltic Shield by the Onega parametric well. The mineral composition of salts, their
geochemical features, and the isotopic composition of carbonate carbon and oxygen have been studied. After fluid inclusions
present in salts, their metamorphism temperature and isotopic composition of helium and argon were determined. The obtained
results give evidence of the fact that rock salts and magnesites associated with them were formed in an evaporate basin with
participation of deep crustal processes. The age of the underlying granitoids (2.716 ± 9 Ma) is determined using the Pb—Pb
method. 相似文献
3.
N. S. Gorbachev T. P. Dadze G. A. Kashirtseva A. F. Kunts 《Geology of Ore Deposits》2010,52(3):215-233
To estimate the behavior of Au, Pd, REE, and Y in magmatic and postmagmatic processes, a series of experimental studies on
the solubility of noble metals and REE in magma, magmatic fluid, and hydrothermal solutions has been performed in wide temperature
and pressure ranges (300–400°C, 860–1350°C; 1–14 kbar). The coefficients of Au and Pd partitioning (D
F/L) between fluid and tholeiitic melt have been determined. Depending on P, T, and the composition of the system, they vary from 1 to 11 for Au and 0.02 to 1 for Pd. The phase solubility technique was
used to determine Au and Pd solubility in hydrothermal fluid. The effects of temperature, composition, and fluid acidity on
Au and Pd solubility have been estimated. The high solubility of these metals in aqueous chloride solutions has been established
for both Au (28–803 mg/kg at T = 300°C, 305–1123 mg/kg at T = 350°C, and 330–1400 mg/kg at T = 400°C) and Pd (40–126 mg/kg at T = 300°C, 62–152 mg/kg at T = 350°C, and 20–210 mg/kg at T = 400°C). The coefficients of REE and Y partitioning (D
F/L) between fluid and tholeiitic or alkaline melts have been determined. They vary from 0.00n to 2 depending on P, T, and fluid composition. The experimental data on Au and Pd solubility in solutions and magmatic fluids and the wide variation
of REE D
F/L between fluid and melt show that magmatic and hydrothermal fluids are efficient agents of Au, Pd, and REE transfer and fractionation.
The obtained experimental data were used for elucidating sources of fluids and their role in the genesis of Au-Pd-REE occurrences
in the Subpolar Urals. 相似文献
4.
Gorbachev N. S. Kostyuk A. V. Shapovalov Yu. B. Gorbachev P. N. Nekrasov A. N. Soultanov D. M. 《Doklady Earth Sciences》2019,489(2):1421-1425
Doklady Earth Sciences - The phase relations upon eclogitization of basalt and melting of H2O-bearing eclogite were studied experimentally for basalt–H2O in the range of P = 3.7–4.0 GPa... 相似文献
5.
Gorbachev N. S. Kostyuk A. V. Shapovalov Yu. B. Gorbachev P. N. Nekrasov A. N. Soultanov D. M. 《Doklady Earth Sciences》2019,488(2):1240-1244
Doklady Earth Sciences - Phase relations in the phlogopite–carbonate system were studied at P = 3.8 GPa and T = 1200–1300°C. The interaction of phlogopite with the carbonate melt... 相似文献
6.
Experimental study of gabbro–norite eclogitization and melting at P = 4 GPa has made it possible to reveal the effective influence of fluid and temperature on the phase relationships. The melt composition varies from andesite–dacite in “dry conditions” to phonolite and carbonate in the presence of a fluid. The Grt-containing melting curve is replaced by the Cpx-containing liquidus as the temperature changes or a fluid is added. Hence, the possible presence of “garnetitite” and “clinopyroxenite” in the upper mantle was proved experimentally. The ultimate pressure of the spinel facies at the depth of the eclogite upper mantle is controlled by the stability of Cht ≤ 4 GPa. The revealed similarity of the spectra of REE-adakite, tonalite–trondhjemite–granodiorite (TTG), and melts formed under the partial melting of eclogitized gabbro–norite does not contradict the existing ideas of the eclogite source of the TTG rocks. Wide variations in the interphase microelement distribution factors D (Grt, Cpx)/L are indicative of effective fractionation of the microelements in the course of eclogite melting and differentiation. 相似文献
7.
B. F. Gorbachev T. Z. Lygina T. M. Argynbaev Z. V. Stafeeva 《Lithology and Mineral Resources》2012,47(1):36-47
The Zhuravlinyi Log deposit is located 12 km southeast of Plast City. The deposit was initially prospected in 1951 and 1952
under the supervision of V.G. Lyulicheva. The prospecting revealed the presence of kaolin of quality surpassing the raw material
in the Eleninsk and Kyshtym deposits. Although a positive assessment was given, new prospecting and appraisal works were carried
out under the supervision of V.I. Kakorin in the vicinity of the previously discovered deposit in 1985 taking into consideration
recommendations given by the VNIIgeolnerud (renamed TsNIIgeolnerud) Federal State Unitary Enterprise. The results revealed
several separate white and pale kaolin deposits. Exploitation of the deposit was started even before its exploration. Construction
of the Plast-Rifey dressing plant was completed during the exploitation of the central ore body. Follow-up exploration of
the deposit completed in 2006 confirmed that the dry kaolin equivalent reserves of categories B + C1 according to the Russian classification (approximately corresponding to the measured + indicated reserve in the western classification)
and category C2 (approximately corresponding to the inferred reserve) are estimated at 11.05 and 5.55 Mt, respectively. The Zhuravlinyi Log
deposit is a major supplier of kaolin products fitting the standards of paper, fine ceramics, fiberglass, chemical reagents,
and others. The present paper based on the exploration data attempts to show specific features of the geological setting of
this deposit, as well as the mineral composition and properties of kaolin therein. 相似文献
8.
Secondary alterations of Cretaceous, Jurassic, and Triassic terrigenous complexes recovered by borehole SG-7 were studied
from the depth of 3620 m to 6920 m (roof of basalts). Down to the depth of ∼6770 m, the section shows a gradual intensification
of catagenetic alterations of sandy rocks: the formation of pressure dissolution textures and regeneration of clastic quartz.
Intensification of the transformation of clay minerals is not observed in this mineral. Variations in the contents of illite,
hydromicas, mixed-layer minerals, smectite, chlorite, and kaolinite at different depths of the recovered section are related
to changes in the provenance during the accumulation of sedimentary complexes. The Middle Triassic coarse-grained sandy rocks
(suprabasalt sequence) are more intensely transformed: they are marked by microstylolitic textures of pressure dissolution,
recrystallization blastesis of clastic quartz grains, and newly formed zoisite. The composition of clay minerals is also characterized
by variation: micas are represented by sericite with ΔD = 0; Fe-chlorite and kaolinite are noted. These features suggest the
absence of linear positive correlation of T and P with the subsidence depth of sedimentary complexes. Intense heating (up to 200–300°C) of the Middle Triassic suprabasalt
rocks is likely caused by trap activity (intense effusion of basalt lavas). Investigation of secondary minerals in basalts
recovered by borehole SG-7 revealed that the grade of their transformation matches the medium-temperature subfacies of the
greenschist facies. 相似文献
9.
10.
P. C. Lightfoot A. J. Naldrett N. S. Gorbachev W. Doherty V. A. Fedorenko 《Contributions to Mineralogy and Petrology》1990,104(6):631-644
The sequence investigated of the Siberian Trap at Noril'sk, USSR, consists of at least 45 flows that have been divided into six lava suites. The lower three suites consist of alkalic to subalkalic basalts (the Ivakinsky suite), overlain by nonporphyritic basalts (the Syverminsky suite), and porphyritic and picritic basalts (the Gudchikhinsky suite). The upper three suites are tholeiitic. The uppermost 750 m of dominantly non-porphyritic basalt belong to the Mokulaevsky suite and are characterized by a nearly constant Mg number (0.54–0.56), SiO2 (48.2–49.1 wt%), Ce (12–18 ppm), and Ce/Yb (5–8). The underlying 1100 m of dominantly porphyritic basalt belong to the Morongovsky and Nadezhdinsky suites. There is a continuous increase in SiO2 (48.1–55.2 wt%), Ce (12–41 ppm), and Ce/Yb (5–18) from the top of the Mokulaevsky to the base of the Nadezhdinsky with little change in the Mg number (0.53–0.59). Mokulaevsky magmas have trace element signatures similar to slightly contaminated transitional type mid-ocean ridge basalts. The change in major and trace element geochemistry in the upper three suites is consistent with a decline in the degree of anatexis and assimilation of tonalitic upper crust by Mokulaevsky magma. The Nadezhdinsky and underlaying lavas thicken within and thus appear to be related to an elongate basin centred on the Noril'sk-Talnakh mining camp. The Mokulaevsky and Morongovsky lavas thicken to the east and appear to be related to a basin centred more than 100 km to the east of the Noril'sk region; these magmas may have risen up out of a different conduit system. 相似文献