摘要
基于小秦岭—熊耳山地区多金属矿床辉钼矿Re-Os模式年龄、矿物40Ar-39Ar年龄、高精度矿物和岩石Rb-Sr等时线测年数据,以及与成矿相关花岗岩的SHRIMP测年数据的分析和研究,认为小秦岭—熊耳山地区燕山期大规模成矿作用主要出现在140 Ma和120 Ma两个时期,其中钼钨铅锌矿系列主要形成于早成矿期,金矿形成于晚成矿期。根据与这两个成矿期所对应的岩浆热事件,说明是两期岩浆活动的结果,其所对应的地球动力学背景分别为构造体制大转换和岩石圈大规模拆沉作用下的伸展环境。
Based on the research and analysis of molybdenite Re-Os model age of the polymetal ore deposits in Xiaoqinling Xiong＇ershan Area, and mica, potash feldspar, quartz 40Ar-39Ar age, rock Rb-Sr isochrone age data, along with SHRIMP U-Pb data of Yanshanian ore deposits-related granites a conclusion is made that large scale mineralization was mainly concentrated at about 140 Ma and 120 Ma, the two periods during Yanshan Epoch in the area. The Mo-W-Pb-Zn mineralization series mainly occurred in the early period, whereas gold mineralization series in the later one. Thus the two mineralization series belong to different magma thermal events that correspond to the extensional geodynamic settings of the tectonic regime changing and lithosphere thinning process respectively.
出处
《地质找矿论丛》
CAS
CSCD
2008年第4期281-286,共6页
Contributions to Geology and Mineral Resources Research
基金
河南省矿产资源潜力评价项目(资[2007]038-01-15)资助
