Origin of the ore-forming matter from the Liwu copper orefield in Jiulong, Sichuan
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摘要: 本文通过氢氧同位素、硫同位素及微量元素的测试分析,结合矿田地质背景对成矿物质来源进行了分析,认为里伍铜矿田成矿物质主要与燕山期"S"型花岗岩的侵入作用有关。在岩浆侵入过程中,由于热作用的驱动,岩浆热液携带部分成矿物质,沿一定的通道上升或运移,并不断与围岩发生物质的带出和带入,成矿流体是以岩浆热液为主的多组份的热液体系。Abstract: The Liwu copper orefield in Jiulong, Sichuan tectonically lies in the Jianglang metamorphic core complexes. The detailed examination has been made for the origins of the ore-forming matter from the Liwu copper orefield on the basis of hydrogen, oxygen and sulfur isotopes, trace elements and geological background. The origins of the ore-forming matter are believed to be associated with the intrusion of the Yanshanian "S"-type granites. The magmatic hydrothermal fluids with the ore-forming matter migrated upwards along the pathways due to the thermal effect during the magmatic intrusion. Meanwhile, the repeated reaction between the magmatic hydrothermal fluids and wall rocks once occurred and resulted in the formation of the multicomponent hydrothermal systems.
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