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- W2353296612 abstract "Medium-and large-scaled skarn Cu-Au±Mo deposits, e.g. Kelu, Liebu, Chongmuda and Chenba etc., are distributed in Shannan area of the Gangdese Cu-Au metallogenic belt. Intrusions-related skarn copper mineralization belongs to high K and calc-alkalic rock series, located in late collision volcano-magmatic arc and formed between 20 to 30Ma. Copper mineralization occurs at exocontact zone of the lower Cretaceous Bima Group carbonate and other calcareous-bearing sedimentary rocks with intrusions. At present, three main mineralization types are identified, including skarn type, hydrothermal vein type, and porphyry type. Mineralizing associations are Cu-Mo, Cu-Au, and Cu. In ore districts, those mineralization types form an entire porphyry-skarn Cu-Au±Mo ore forming system. Alterations of the exocontact are mainly skarnization and hornfielsization, while the alterations of the endocontact are mainly sericitization, silification and chloritization of intrusion. In the study area, the endoskarn is not well developed. Copper mineralization occurs mainly in the exocontact in the form of stratoid, lenticular and pockety ore body. Veined mineralization can be seen in marblized and hornfelsed siltstone, being away from the contact zone. In the endocontact, the mineralization is mainly veinlet-like and disseminated. In the study area, skarnization can be divided into early skarnization stage and late water-bearing silicate stage. The early skarnization stage is featured by mainly andradite and grossular skarn, containing minor diopside, hedenbergite, magnetite and some copper minerals; and the late water-bearing silicate stage is of replacement of garnet skarn by chlorite, epidote, quartz, calcite and together sulfides precipitation. The latter is the main stage of copper mineralization. Bornite is the dominant ore mineral associated with minor chalcopyrite and pyrite; and gold as well as silver are distributed in bornite and wittichenite etc. The Cu-Au skarn deposits in the Kelu-Liebu-Chongmuda belt are interpreted as the shallow level skarn related deposits in an uniform porphyry-skarn ore forming system. Appearance of porphyry copper mineralization in some skarn deposits implies that skarn copper mineralization of the study area resemble to those in northern sub-metallogenic belt, having uniform porphyry-skarn ore forming system. Therefore, it is presumed there should be potential to find deep level porphyry-type Cu-Au mineralization targets." @default.
- W2353296612 created "2016-06-24" @default.
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- W2353296612 date "2006-01-01" @default.
- W2353296612 modified "2023-09-25" @default.
- W2353296612 title "Geology and Mineral Assemblage of Tertiary Skarn Cu-Au±Mo Deposits in the Southeastern Gangdese Arc:Implications for Deep Exploration" @default.
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