摘要
东天山东段-北山地区三叠纪钼成矿作用广泛而强烈,新探明大中型矿床4处:花黑滩钼矿床、白山钼矿床、小狐狸山钼矿床、东戈壁钼矿床。这些钼矿床均分布在古生代板块缝合带附近,与造山后钙碱性花岗岩成因联系密切,成矿作用高峰期在235-220Ma。矿石中辉钼矿铼含量表明,成矿物质中有不同程度幔源组份的贡献。造山后伸展背景下,岩石圈拆沉、软流圈地幔上涌底侵,导致下地壳部分熔融,这是成岩-成矿作用重要动力学条件,也为成矿作用带来丰富热能、流体及成矿物质。区域性深大断裂是深部岩浆或流体上侵的有利通道和成矿有利部位。
Intensive magmatic activities and related Mo mineralization occurred throughout in the east part of Eastern Tianshan and the Beishan area,such as the newly explored Huaheitan,Baishan,Xiaohulishan,and Donggobi molybdenum deposits.Previous U-Pb and Re-Os dating suggested these Mo deposits formed during the 235-220 Ma interval.The Re content in the molybdenite,together with Sr-Nd-Hf isotopic composition of the granite,suggested that the ore-forming materials derived from mixed crustal and mantle sources.The post-orogenic lithospheric extension and mantle-derived magmas underplating were important geodynamic controls on the Mo mineralization in the Beishan area,and provided abnormal heat flow,voluminous fluids of multiple sources and ore metals.It is significant to pay more attention to evaluation of the ore-forming potentiality in the Triassic granites in Beishan belt.
出处
《新疆地质》
CAS
CSCD
北大核心
2013年第1期21-28,共8页
Xinjiang Geology
基金
国家305项目(2011BAB06B04-05)资助
关键词
东天山
北山
钼矿床
三叠纪
Eastern Tianshan Beishan area Molybdenum deposits Triassic
