甘肃省龙首山地区元古宙铜镍矿床成岩成矿地质背景探讨  

DISCUSSION ON GEOLOGIC BACKGROUND OF LONGSHOUSHAN AREA OF GANSU IN PROTEROZOIC EON

作　　者：陈向阳[1] 陈博[1] 焦建刚[2] 

机构地区：[1]西安地质矿产研究所,陕西西安710054 [2]长安大学地球科学与资源学院,陕西西安710054

出　　处：《甘肃地质》2008年第4期11-16,共6页Gansu Geology

基　　金：国家自然科学基金项目(40702015)资助

摘　　要：作者综述了龙首山地区元古宙的地层岩性组合、岩石地球化学、年代学等特征,证明龙首山地区在整个元古宙期间的地质构造背景为大陆裂谷环境。结合甘肃金川铜镍硫化物矿床年代学进展(单颗粒锆石U-Pb年龄约827Ma),界定了金川矿床成岩成矿的地质背景为新元古代的裂谷环境,可能与Rodinia大陆裂解有关,但不具备地幔柱成因的诸多特征。Study on stratigraphy, petrogeochemistry, chronology and so on, the authors prove Longsnou mountains is on inner-continent rifting background during Proterozoic. According to the chronology progress of Jinchuan mafic-ultramafic intrusions （Zircon U-Pb Shrimp age is 827Ma）, the metallogenic and petrogenetic process of Jinchuan Cu-Ni sulfide ore deposit possibly happened in stretch structure setting of nero-proterozoic inner-continent rifting, which maybe related with global Rodinia continent rifting, but without characteristics of mantle plume genesis.

关 键 词：裂谷 地幔柱 元古宙 金川 龙首山 

分 类 号：P618.4[天文地球—矿床学]