Ar^(39)/Ar^(40) dating of three typical gold deposits in southern Qinling and its implication  

作　　者：汪东波 邵世才 冯建忠 王学明 

机构地区：[1]Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100027, China, Beijing Institute of Geology for Mineral Resources,Beijing 100012, China [2]Beijing Institute of Geology for Mineral Resources,Beijing 100012, China

出　　处：《中国有色金属学会会刊：英文版》2002年第3期498-503,共6页Transactions of Nonferrous Metals Society of China

基　　金：Project(G19990 43 2 13 )supportedbytheNationalKeyFoundamentalResearchandDevelopmentProgram ;project (96-914-0 1-0 4)supportedbytheStateScienceandTechnologyProgramofChina

摘　　要：Three types of gold deposits,which are the disseminated ore,auriferous quartz vein,and ore hosted in ductile shear zone have been identified in southern Qinling. The dating of the Baguamiao gold deposit in Fengxian, Xiaogouli gold deposit in Chengxian and Shangjiagou gold deposit in Kangxian gave rise to plateau ages (131.91±0.89)Ma, (197.45±1.13)Ma and (161.59±0.56)Ma respectively, consistent with the isochron ages. It is indicated that the metallization occurred in late Indosinian and early Yanshannian. The Ar 39 /Ar 40 dating affirms their metallogenic ages ranging from (131.91±0.89)Ma to (197.45±1.13)Ma which couple with the epoch in which the continent continent collision and intracontinent orogene took place. Consequently, it is suggested that the collision orogene, magmatic intrusion and location of gold deposits constitute an organic successive process. In line with the tectonic event, the large scale metallization symbolizes the different representation of the same continental dynamics in the evolution of regional tectonics.Three types of gold deposits,which are the disseminated ore,auriferous quartz vein,and ore hosted in ductile shear zone have been identified in southern Qinling. The dating of the Baguamiao gold deposit in Fengxian, Xiaogouli gold deposit in Chengxian and Shangjiagou gold deposit in Kangxian gave rise to plateau ages (131.91±0.89)Ma, (197.45±1.13)Ma and (161.59±0.56)Ma respectively, consistent with the isochron ages. It is indicated that the metallization occurred in late Indosinian and early Yanshannian. The Ar 39 /Ar 40 dating affirms their metallogenic ages ranging from (131.91±0.89)Ma to (197.45±1.13)Ma which couple with the epoch in which the continent continent collision and intracontinent orogene took place. Consequently, it is suggested that the collision orogene, magmatic intrusion and location of gold deposits constitute an organic successive process. In line with the tectonic event, the large scale metallization symbolizes the different representation of the same continental dynamics in the evolution of regional tectonics.

关 键 词：金矿床 等时线年龄 地球化学 南秦岭地区 氩同位素 

分 类 号：P618.51[天文地球—矿床学]