Results 171 to 180 of about 898,195 (216)

Hydrothermal alteration in the "porphyry copper" deposits

Economic Geology, 1947
The hydrothermal alteration, which was accompanied by the introduction of copper sulphides in the disseminated copper deposits, is considerably more complex than is generally recognized.Detailed microscopic study of selected porphyry specimens from the important deposits in the United States, together with a review of published data, leads to the ...
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The tops and bottoms of porphyry copper deposits

Economic Geology, 1973
Although it is now widely accepted that porphyry copper deposits consist of zonally arranged shells of alteration and mineralization centered on high-level, calc-alkaline stocks, the nature of their uneconomic upward and downward extensions remains undocumented.
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Separation of Molybdenum and Copper in Porphyry Deposits

2012
The giant Bingham Canyon porphyry Cu-Mo-Au deposit (Utah) is associated with Eocene subvolcanic intrusions. It shows a distinct metal zonation above a barren core, with dominantly shallow Cu-Au mineralization (Cu stage) following the early quartz monzonite porphyry (QMP) intrusion, and spatially deeper Mo mineralization (Mo stage) occurring in a ...
Seo, Jung Hun, Guillong, Marcel, Heinrich, Christoph A.   +2 more
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Rhenium in porphyry copper deposits of the urals

Geology of Ore Deposits, 2013
The overwhelming majority of porphyry Mo-Au-Cu deposits in the Urals are related to the low-K quartz diorite minor intrusions of the island-arc type, which were formed from Silurian Middle-Late Carboniferous. In the South Urals, the Cu/Mo ratio of ore decreases eastward along with enrichment in Re.
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Malanjkhand Copper Deposit, India: Is it not a Porphyry Type?

Journal of the Geological Society of India, 2002
Abstract: The classification of the Malanjkhand as a porphyry type copper deposit is still being debated by some, despite the documentation of all the classic characteristics of the porphyry type deposit. A careful analyses and review of the available data, from many papers, unpublished theses and our own work on Malanjkhand, clearly ...
D. B. Sikka, C. E. Nehru
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Lithospheric Controls on the Distribution of Porphyry Copper Deposits

2023
Lithospheric structure in subduction settings controls the distribution of thermal, compositional and rheological interfaces.  It therefore plays a key role in the generation, fractionation and transport of subduction-related melts that are a vital ingredient of the formation of porphyry copper deposits.  Renewed efforts to understand
Simon Stephenson, Mark Hoggard, Marcus Haynes, Karol Czarnota, Krystian Czado   +4 more
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Marcopper porphyry copper deposit, Philippines

Economic Geology, 1976
Marcopper porphyry copper deposit is located in the Philippines near the center of the island of Marinduque, 180 km south of Manila. The island9s tectonic history is dominated by northwesterly trending elements of the Philippine mobile belt. Mineralization is related to differentiated intermediate intrusives which occupy the core of a northwesterly ...
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Mapping porphyry copper deposits in the Philippines with IP

Geophysics, 1976
Abstract The induced polarization (IP) method has played a very important role in the recent discovery of several new Philippine porphyry copper deposits. It was found, however, that the electrical response measured over different deposits can be extremely variable, even in a limited geographical area.Four main classes of response ...
W. H. Pelton, P. K. Smith
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Metasomatic Zoning of Copper Porphyry Deposits in Kyrgyzstan

Proceedings, 2012
Крупнейшие в Кыргызстане месторождения золото-медно-порфирового типа находятся в Киргизском хребте в Северном Тянь-Шане (рис.1). На западе развиты медно-порфировые с золотом месторождения, формирование которых связано с ордовикскими островодужными обстановками (Андаш, Талды-Булак, Узунбулак, Каракол, Булакаши и др.).
N. Pak, E. Ivleva
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Chapter 5 Porphyry Copper Deposits in China

2019
Abstract Porphyry Cu deposits in China contain a total resource of ~47 million tonnes (Mt) Cu at average grades ranging mostly from 0.2 to 0.7% Cu (most <0.5% Cu), accounting for 42% of China’s Cu reserves. In terms of contained Cu, 14 Cu-rich porphyry deposits are classified as giant (≥2.0 Mt Cu), and 38 are classified as ...
Zhiming Yang, David R. Cooke
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