| 吉林六批叶沟金矿床绢云母40Ar-39Ar 快中子活化法定年研究 |
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| 引用本文：.2004.40Ar-39Ar Fast Neutron Activation Dating Method for Sericite fro m Liupiyegou Gold Deposit, Jilin Province[J].Mineral Deposits,23(4):502~508 |
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| 基金项目:国家矿产资源勘查项目(2001_882) |
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| 中文摘要:在六批叶沟金矿石中，精选出与金矿物同期生成的绢云母作为样品， 采用40Ar-39Ar 快中子活化法测年，获得8个一致相连的平坦型绢云母年龄谱， tp=(190.28±0.30) Ma，氩同位素计算得等时线年龄为(189.98±0.58) Ma，两 者完全吻合。等时线截距为(296.9±10.0) Ma，与大气氩的该值(295.5 Ma)相比较，两者完 全吻合，表明该样品出自未受明显后期热力作用影响的非扰动体系。锁定六批叶沟金矿床主要成矿年龄为190 Ma左右，属早侏罗世的燕山早期。 |
| 中文关键词:地球化学 绢云母 40Ar-39Ar 快中子活化 法定年研究 六批叶沟金矿床 吉林 |
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| 40Ar-39Ar Fast Neutron Activation Dating Method for Sericite fro m Liupiyegou Gold Deposit, Jilin Province |
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| Abstract:Sericites formed at the same stage as ores in the Liupiyegou gold deposit were u sed as samples. Using the 40Ar-39Ar fast neutron activation dating method, the authors got 8 concave and middle_high temperature age charts 〔tp=(190.28±0.30) Ma〕, which are connected, consistent and in accord wi th the Ar isotope isochron age (189.98±0.58) Ma. The intercept of the isochron is (296.9±10.00) Ma, which is well consistent with the data of atmospheric Ar (295.5 Ma). It is shown that the samples were collected from a system which had n ot been subjected obviously to the influence of later thermodynamic action.The m etallogenic age is 190 Ma, thus belonging to Jurassic. |
| keywords:geochemistry, sericite, 40Ar-39Ar fast neuron activation dating, dating method, Liupiyegou gold deposit, Jilin |
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