兰坪——思茅盆地砂页岩中铜矿床成矿物质来源研究

兰坪－思茅中，新生代盆地砂页岩中铜矿床的微量元素特征，稀土配分型式以及硫、铅、碳、氧、氢、硅等同位素等表明，成矿金属物质、硫和碳、既有来自赋矿岩石（包括火山岩），又有来自基底岩石，同时还有深部物质的参与。成矿溶液主要来自大气降水、矿化和蚀变作用是在水／岩比值较低的体系中进行的。

ORE-FORMING MATERIAL SOURCES OF THE COPPER DEPOSITS FROM SANDSTONE AND SHALE IN LANPING-SIMAO BASIN,WESTERN YUNNAN AND THEIR GENETIC IMPLICATIONS

The copper deposits, occurring in the Lanping-Simao basin of western Yunnan, are the new type of copper deposits showing many unique features. The copper deposits exist in the Mesozonic and Cenzonic clastic rock formation composed of sandstone, siltite and argillite. In the light of the results of Q-cluster analysis of rocks and ores and the rare earth element distribution patterns, it is reasonably assumed that the ore-forming substances of copper deposits have affinity mainly with red clastic formation and underlying rocks. The S,C,Si,Pb,H and O isotopic compositions show that the ore-forming materials were mainly derived from the country rocks, the underlying rocks ,and partially deeper sources and the ore-forming solution from the ancient meteoric water. The amount of the hydrothermal fluids in mineralizing and altering systems was relatively small.