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小秦岭东闯金矿成矿作用的40Ar-39Ar年代学研究 预览 被引量:10

~(40)Ar-~(39)Ar Ages of the Ore-forming Processes of the Dongchuang Gold Deposit in the Xiaoqinling District,China
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摘要 小秦岭地区的东闯金矿是中国的超大型金矿床之一,被认为是典型的造山带型金矿床,但其成矿时间有争议。矿床地质特征研究表明,成矿作用可分为粗粒黄铁矿—石英、细粒黄铁矿—石英、多金属硫化物、碳酸盐—石英四个阶段。笔者分别于两个实验室测定了第Ⅰ、Ⅲ和Ⅱ阶段的氩氩年龄,测定结果表明,Ⅰ阶段石英氩氩坪年龄为142.9±2.9Ma;Ⅱ阶段绢云母氩氩坪年龄为132.2±2.6Ma,等时线年龄为132.6±2.7Ma;Ⅲ阶段石英氩氩坪年龄为128.3±6.2Ma,与地质实际吻合并可相互印证。本文结果表明成矿作用发生在143~128 Ma,侏罗纪—白垩纪之交的挤压—伸展转变期,显示挤压伸展转变期的减压增温环境是造山带型矿床最为有利的成矿地球动力学背景。 The Dongchuang gold deposit, which is a typical orogenic gold deposit in the Xiaoqinling District, is one of the super-large gold deposits of China. The ore-forming age of the Dongchuang gold deposit is still in dispute. The geology of the deposit indicates that the ore-forming process can be classified into four stages: the formation of coarse grain pyrite and quartz (stage Ⅰ) , the formation of fine grain pyrite and quartz (stage Ⅱ) , the formation of polymetallic sulfide (stage Ⅲ ) , and the formation of carbonate and quartz (stage Ⅳ ). The Ar-Ar ages of stages Ⅰ,Ⅱ,and Ⅲ were determined in two different laboratories. The age results implied that the Ar-Ar plateau age of quartz in stage Ⅰ is 142. 9~2. 9Ma; the Ar-Ar plateau age of sericite in stage Ⅱ is 132. 2 ~2. 6Ma, and its isochron age is 132. 6~2.7Ma; and the Ar-Ar plateau age of quartz in stage Ⅲ is 128. 3~ 6. 2Ma. These age results, which are in accordance with the geology, indicated that the Dongchuang gold deposit was formed during 143 to 128Ma, which was also the transition period of compression to extension in the Jurassic to Cretaceous period. The environment with low pressure and high temperature of the transition period could be the most suitable ore-forming geochemical kinetic background for orogenic deposit.
作者 李强之 陈衍景 钟增球 李文良 李绍儒 郭晓东 金宝义 LI Qiangzhi~(1,2)),CHEN Yanjing~(1)),ZHONG Zengqiu~(3)),LI Wenliang~(2)),LI Shaoru~(2)),GUO Xiaodong~(2)),JIN Baoyi~(2))1) College of Earth and Space Science,Peking University,Beijing,1008712) Gold Geology Institute of the Armed Police,Langfang,Hebei,0650003) China University of Geosciences,Wuhan,Hubei,430074
出处 《地质论评》 CAS CSCD 北大核心 2002年第S1期122-126,共5页 Geological Review
关键词 东闯金矿 小秦岭 氩氩坪年龄 造山带型金矿 挤压伸展转变期 Dongchuang gold deposit Xiaoqinling Ar-Ar plateau age orogenic gold deposit transition period of compression to extension
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