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(三)火山岩铜矿化火山岩铜矿的硫同位素测定,表明成矿物质来自壳下层或上地幔,与火山作用有关.火山作用表现为多期多旋回,而与铜矿化有关的则是喷发后长期活动的含矿气液对喷发物的交代.火山岩成矿作用与侵入、次火山、大陆或海底喷发-沉积作用都有联系.火山气液可与地表水、地下水、特别是海水作用而使铜质集中.与铜矿化有关的火山岩,有玄武质岩浆分异物和安山质岩浆分异物两大类.(1)“黄铁矿型”铜矿化地槽发育早期.玄武岩浆沿基底断裂喷溢成海底枕状熔岩
(Ⅲ) Sulfur Isotope determination of volcanic copper mineralized volcanic copper deposits shows that the ore-forming materials are derived from the lower or upper mantle of the crust and are related to volcanism. Volcanism is characterized by multi-period and multi-cycle volcanoes, while copper mineralization is related to eruption After long-term activity of the gas-bearing fluid on account of the eruption of volcanic mineralization and invasion, subvolcanic, continental or submarine eruption-sedimentation are linked volcanic gas and surface water, groundwater, especially the role of sea water and So that the copper concentration.Corresponding to the copper mineralization of volcanic rocks, there are basaltic magma and Andean magmatic isolates two major categories. (1) “pyrite type” copper mineralization in early trough development. Basalt Sludge overflows into rudimentary pillow lava along the basement