江南过渡带东至查册桥金矿床~(40)Ar-~(39)Ar年代学及成矿条件研究
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  • 英文篇名:~(40)Ar-~(39)Ar Geochronology and its Geological Significance of Zhaceqiao Gold Deposit in Dongzhi, Jiangnan Transition Zone
  • 作者:聂张星 ; 石磊 ; 古黄玲 ; 钱祥 ; 沈欢喜 ; 杨晓勇
  • 英文作者:NIE Zhangxing;SHI Lei;GU Huangling;QIAN Xiang;SHEN Huanxi;YANG Xiaoyong;No.311 Geological Team,Anhui Bureau of Geology and Mineral Resources Exploration;School of Earth and Space Sciences,University of Science and Technology of China;
  • 关键词:~(40)Ar-~(39)Ar年龄 ; 成矿时代 ; 叠加成矿作用 ; 类卡林型金 ; 江南过渡带 ; 东至查册桥
  • 英文关键词:~(40)Ar-~(39)Ar dating;;metallogenic epoch;;superimposed mineralization;;Carlin-like type gold deposit;;Jiangnan Transition Zone;;Zhaceqiao in Dongzhi
  • 中文刊名:DGYK
  • 英文刊名:Geotectonica et Metallogenia
  • 机构:安徽省地质矿产勘查局311地质队;中国科学技术大学地球和空间科学学院;
  • 出版日期:2017-06-15
  • 出版单位:大地构造与成矿学
  • 年:2017
  • 期:v.41;No.158
  • 基金:安徽省国土资源厅科技项目(2012-1-28、2016-k-1);; 国家自然科学基金(41173057、41372087)联合资助
  • 语种:中文;
  • 页:DGYK201703008
  • 页数:14
  • CN:03
  • ISSN:44-1595/P
  • 分类号:72-85
摘要
查册桥金矿是近年来在江南过渡带发现的一个金多金属矿床,本文对该矿床与矿化有关的蚀变花岗闪长斑岩中绢云母进行了~(40)Ar-~(39)Ar年龄测试,获得蚀变岩金矿石绢云母坪年龄156.9±1.6 Ma,等时线年龄152±28 Ma和矿化强蚀变花岗闪长斑岩绢云母坪年龄142.1±1.3 Ma,等时线年龄137±13 Ma。程檀矿段与牛头高家矿段流体包裹体均一温度为160℃左右,氢氧同位素特征显示成矿热液以岩浆热液为主。结合本区及邻近矿区相关研究成果,本区金矿主要为浅成、低温型,成矿物质和热液具有多来源特征,原生金矿以微细粒浸染型为主,具类卡林型金矿矿化特征,其年龄值分别对应于燕山期不同阶段构造活动和成岩成矿作用时代,其成矿过程经历了中侏罗世韧-脆性挤压构造变形和蚀变、矿化,晚侏罗世-早白垩世早期与岩体侵入相关的金多金属矿化,以及早白垩世中、晚期浅成低温热液成矿作用。
        The Zhaceqiao gold-polymetal deposit was discovered recently in the Jiangnan Transitional Zone. In order to obtain the ore-forming age, sericite was separated from the altered granite porphyry which hosts the gold deposit. ~(40)Ar-~(39) Ar analyses of sericite in gold ore yield spectrum age of 156.9±1.6 Ma with the isochron age of 152±28 Ma. The spectrum age of sericite in altered granodiorite porphyry is 142.1±1.3 Ma with the isochron age of 137±13 Ma. The homogenization temperature of fluid inclusions in quartz from the Niutougaojia and Chengtan ore sections is c.a. 160 ℃. The H-O isotopic compositions indicate that the ore-forming fluids mainly come from magmatic hydrothermal sources. Integrating with regional studies, the Zhaceqiao gold deposit is predominantly characterized by shallow, low temperature and epithermal, similar to Carlin-like type gold deposit. The Zhaceqiao gold deposit was formed in Yanshanian through multi-stage superimposition. The gold mineralization was related to the ductile-brittle compressional tectonic deformation and alteration in middle Jurassic to gold, while the polymetallic mineralization was related to the Late Jurassic-Early Cretaceous igneous activity, and the epithermal mineralization in the middle and late stage of the Early Cretaceous.
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