CAJ | 학술논문

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.
동천산동단-북산지구삼첩기목성광작용엄범이강렬,신탐명대중형광상4처:화흑탄목광상、백산목광상、소호리산목광상、동과벽목광상.저사목광상균분포재고생대판괴봉합대부근,여조산후개감성화강암성인련계밀절,성광작용고봉기재235~220Ma.광석중휘목광래함량표명,성광물질중유불동정도만원조빈적공헌.조산후신전배경하,암석권탁침、연류권지만상용저침,도치하지각부분용융,저시성암-성광작용중요동역학조건,야위성광작용대래봉부열능、류체급성광물질.구역성심대단렬시심부암장혹류체상침적유리통도화성광유리부위.
@@@@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 ma-terials derived from mixed crustal and mantle sources.The post-orogenic lithospheric extension and mantle-derived mag-mas underplating were important geodynamic controls on the Mo mineralization in the Beishan area,and provided abnor-mal 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.