| 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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| 引用本文： | 聂张星,石磊,古黄玲,钱祥,沈欢喜,杨晓勇.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[J].大地构造与成矿学,2017,41(3). |
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| 作者姓名： | 聂张星 石磊 古黄玲 钱祥 沈欢喜 杨晓勇 |
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| 作者单位： | 1. 安徽省地质矿产勘查局311地质队,安徽安庆,246003;2. 中国科学技术大学地球和空间科学学院,安徽合肥,230026 |
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| 基金项目： | 安徽省国土资源厅科技项目，国家自然科学基金 |
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| 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。
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| 关 键 词： | 40Ar-39Ar年龄 成矿时代 叠加成矿作用 类卡林型金矿 江南过渡带 东至查册桥 |
40Ar-39Ar Geochronology and its Geological Significance of Zhaceqiao Gold Deposit in Dongzhi,Jiangnan Transition Zone |
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| NIE Zhangxing,SHI Lei,GU Huangling,QIAN Xiang,SHEN Huanxi,YANG Xiaoyong.40Ar-39Ar Geochronology and its Geological Significance of Zhaceqiao Gold Deposit in Dongzhi,Jiangnan Transition Zone[J].Geotectonica et Metallogenia,2017,41(3). |
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| Authors: | NIE Zhangxing SHI Lei GU Huangling QIAN Xiang SHEN Huanxi YANG Xiaoyong |
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| Abstract: | 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.40Ar-39Ar 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±l.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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| Keywords: | 40Ar-39Ar dating metallogenic epoch superimposed mineralization Carlin-like type gold deposit Jiangnan Transition Zone Zhaceqiao in Dongzhi |
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