Results 221 to 230 of about 16,003 (268)

Formation of the Gold Ore Mineralization in Rodingite

Proceedings, 2008
Обсуждается формирование золоторудной минерализации на контакте комплекса параллельных даек с серпентинизованными ультрабазитами в офиолитовой ассоциации Северного Сахалина. Золоторудная минерализация приурочена к слою натролитов и связана с контактово-инфильтрационными биметасоматическими процессами в результате подъёма офиолитового диапира в зоне ...
R.M. Yurkova, B.I. Voronin
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Gold ore provinces and formations

International Geology Review, 1967
Granitic magmas result from refusion of sedimentary rocks. Metals associated in gold ore formations are mobilized by magmatic and etamorphic activity from volcanic and sedimentary rocks of a geosynclinal series. The comportment of metals during the processes of mobilization, transfer, and deposition is ruled by their atomic structure and ...
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Geology and Formation of the Ore Deposit

2012
The surroundings of the Idria ore deposit is composed of four SW-verging nappes, with the mercury mineralization being emplaced in the lower part of the Trnovo nappe, in the Idria inner-thrust sheet. The geologic structure of the Idria-Cerkno mountain range was described by CAR (2010).
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Copper-Zeolite Ore Formation

1988
Abstract The first evidence of native copper in the volcanic rocks in the northern part of the Siberian platform was published in the classic work of V.I. Vernadsky “An Opus on Descriptive Mineralogy”. In 1945, G.G. Moor, while analyzing scarce data on native copper in the lava fields of the area of the Siberian traps concluded that ...
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Deposition of magnetite ores, magmatic stage, in the magnesioskarnal ore-bearing formation

International Geology Review, 1971
Deposition of magnetite ores, magmatic stage, in magnesial skarns of the Sheregesh ore deposit (Montane Shoriya) is characterized, and it is shown that clarification of possibilities of finding similar ores is essential for correct evaluation of perspectives for skam-iron ore fields.
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Some aspects of ore formation in ultramafics

Mineralium Deposita, 1979
The relationship between petrogenesis and ore formation during the development of ultrabasics is discussed. It is emphasized that it is different for deep-seated pyrope peridotite and shallower spinel-enstatite peridotite facies. The influence of depth (pressure) on the composition of fluids which accompany ultrabasic magmatism is considered.
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Formation of ore deposits by water of compaction

Economic Geology, 1964
Time and stratigraphic relationships do not support Noble9s (Econ. Geol., v. 58, no. 7, p. 1145-1156) thesis as applied to Wisconsin-Illinois zinc-lead district.
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The Witwatersrand deposit and the problem of the ore formation

Russian Journal of Pacific Geology, 2007
The problem of the origin of the Witwatersrand gold-uranium deposit is considered. The fluvial and explosion hydrothermal origin of pyrite spheroids and Au-bearing pseudoconglomerate is denied. Evidence for the primary character of spheroids and the autochthonous crystallization of pyrite under endogenic conditions is furnished. The association of gold
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Evolution of the ore formation in the history of the earth

Physics and Chemistry of the Earth, 1979
Abstract The formation of the earth's crust proceeded unevenly, mainly during the first 2 milliards of years of the earth (4.6-2.6 mld.). This has led to the inclusion into the early protocrust of the first undifferentiated blocks of the oceanic crust containing effusives of ultrabasic composition of the type of comatiites, which were attended by ...
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Microbiology and the formation of ore deposits

2019
Peer ...
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