【摘要】 东天山白山铼钼矿区的成岩成矿时代尚存在海西期和印支期之争。最新的同位素年代学研究表明,矿区南部斜长花岗斑岩的锆石U-Pb年龄为235～245Ma,矿区东部黑云母斜长花岗岩的锆石SHRIMPU-Pb年龄为239Ma±8Ma,矿石中辉钼矿的Re-Os等时线年龄为229Ma±2Ma。结合笔者已报道的燕山期岩浆侵位与成矿的年代学证据,首次提出白山铼钼矿区具有印支期和燕山期2期成岩成矿作用,早期成岩成矿作用发生于中三叠世,晚期成岩成矿作用发生于早侏罗世。更多还原

【Abstract】 The age of mineralization and host rocks in the Baishan rhenium-molybdenum district, East Tianshan, Xinjiang, is in dispute. Some advocate a Hercynian age, while others suggest an Indosinian age. Recent isotopic chronological study shows that: the zircon U-Pb age of plagiogranite porphyry in the southern part of the ore district is 235-245 Ma, the zircon SHRIMP U-Pb age of biotite plagiogranite in the eastern part of the ore district is 239±8 Ma;and the Re-Os isochron age of molybdenite from ores is 229±2 Ma. Based on these age data, combined with the chronological evidence of Yanshanian magmatic emplacement and mineralization reported by the authors before,the authors for the first time propose the idea that in the Baishan rhenium-molybdenum district there occurred two phases of rock- and ore-forming processes: the early-phase (Indosinian) rock- and ore-forming processes occurred in the Middle Triassic, while the late phase (Yanshanian) in the Early Jurassic.更多还原