Abstract:The deposit in question is a porphyry copper one of veinlet impregnation type with pyrite, chalcopyrite, and, to a less amount, molybdenite, tetrahedrite, tennantite, sphalerite and galena as the major ore minerals. The orebody occurs in two types of diametrically different rocks: one is Ptoterozoic low-grade metamorphic sequence, having Rb-Sr isotopic age of 1401 m.y. and apparently with sedimentary formation of argillaceous rocks intercalated with feldspathic graywacke and graywacke mudstone as the original rocks; the other is a small granodiorite porphyry intrusive characterized by Rb-Sr isotopic age of 169 m. y. and shaped like a triangle at surface with an area of 0.7 km2.This intrusive body contains large quantities of K-feldspar in the form of porphyroblast produced as a result of metasomatism by deuteric fluids and is characterized by two sorts of mineral assemblages: one is phenocryst minerals consisting mainly of andesine, hornblende, biotite, quartz with minor amounts of apatite, the other is matrix minerals composed predominantly of K-feldspar, quartz and oligoclase. The granodiorite porphyry is a derivative formed at a certain evolution stage of magma, its parent magma seems likely to have been tonalitic magma. The evolution of magma not only proceeded through the normal migration of magma from the great to the small depths, but persisted to the deuteric fluid metasomatism and hydrothermal filling and replacement. The formation of the ore deposit was associated with the deuteric fluid transportation and hydrothermal mineralization; ore-forming materials were chiefly derived from the intrusive body, and metallogenic media were characterized by multiple sources .
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孙海田.1984.江西德兴铜厂斑岩铜矿床岩石学特征及岩浆演化与成矿的关系[J].矿床地质,3(4):34~44.1984.Petrological Characteristics Of The Tongchang Porphyry Copper Deposit At Dexing With A Discussion On The Relationship Of Magmatic Evolution To Metallogenesis[J].Mineral Deposits3(4):34~44
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