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《Acta Geologica Sinica》 2009-05
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Geological Characteristics and Genesis of the Saishitang Copper Deposit in Qinghai Province

LI Dongsheng1,2), KUI Mingjuan1), GU Fengbao1), WANG Jianjun1),BAI Hongxi1),ZHAN Fayu1),WANG Faming1),MA Yanqing1)1) Qinghai Geological Survey, Xining, 810012; 2) Chian university of Geosciences; Beijing, 100083  
Based on data of Saishitang copper mining area, it proved that there have ore-bearing porphyries and peripheral dike swarm. The ore-bearing porphyries are Calc-alkaline-high-K Calc-alkaline-Shoshonitie, coexistence with adakite-like rocks, the ISr (0.7060~0.7086) is similar to the basic rocks and enclaves of later Ttriassic in east Kunlun area, 143Nd/144Nd(0.512226~0.512350) is closed to the adakite-like rocks which formed by basaltic lower crustal melting. The porphyries have a relative with the mantle-derived magma from the enrichment mantle II,and the metallogenic background is related to the magmatic underplating at later Triassic in east Kunlun area. The shallow-seated phase of ore-bearing intermediate-acid stock are living high level with the dike swarm and subvolcanic rock. There have classical porphyritic mineralized alteration with centered ore-bearing porphyries. The mineralization has several stages and ore-bearing mainly of porphyries, meanwhile including of skarns, vein rocks, apophysis and breccia. Although we have found few porphyries currently, and can not completely know their characteristics, yet the thick and big porphyry is an important characteristics which can not be ignored. Porphyry-type is symbiosis with skarn-type and hydrothermal-type, which have the characteristics of porphyry metallogenic series. Compared with the porphyry copper ore deposit in the world, it believed that the gensis of Saishitang copper deposit is a porphyry superposition compound ore deposit.
【Fund】: "青海省东昆仑斑岩及其成矿性探索研究"项目(青国土资矿[2005]24号);; 重点项目(编号01);; "十一五"国家科技支撑计划课题(2006BAB01A06)资助的成果。
【CateGory Index】: P618.41
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