| 湘东南铜山岭铅锌多金属矿床成矿时代与成矿物质来源——Sm-Nd等时线年龄和Pb同位素证据 |
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| 引用本文： | 王云峰,杨红梅,张利国,卢山松,杨泽飞,邱啸飞,刘重芃.湘东南铜山岭铅锌多金属矿床成矿时代与成矿物质来源——Sm-Nd等时线年龄和Pb同位素证据[J].地质通报,2017,36(5):875-884. |
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| 作者姓名： | 王云峰 杨红梅 张利国 卢山松 杨泽飞 邱啸飞 刘重芃 |
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| 作者单位： | 1. 中国地质大学 (北京), 北京 100083;2. 中国地质科学院, 北京 100037;3. 中国地质调查局武汉地质调查中心同位素地球化学实验室, 湖北 武汉 430205;4. 中国地质调查局花岗岩成岩成矿研究中心, 湖北 武汉 430205 |
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| 基金项目： | 中国地质调查局项目《扬子周缘典型铅锌矿床同位素年代学研究》（编号：12120114005701）和《扬子工程湘西-鄂西成矿带神农架—花垣地区地质矿产调查》（编号：DD20160029） |
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| 摘 要： | 铜山岭铅锌多金属矿床位于扬子地块湘南-桂东北坳陷与华夏地块粤北坳陷的拼贴部位,是中国南岭多金属成矿区代表性矿床之一。为确定矿床成矿时代,挑选铜山岭铅锌多金属矿床中含矿矽卡岩的石榴子石进行Sm-Nd同位素定年,获得的等时线年龄为173±3Ma,指示成矿作用发生于燕山早期。对金属硫化物矿物进行了Pb同位素分析,其~(206)Pb/~(204)Pb、~(207)Pb/~(204)Pb、~(208)Pb/~(204)Pb平均值分别为18.602、15.701、38.729,表明成矿物质来源于相对富集铀铅、略微亏损钍铅的上地壳源区。从(~(207)Pb/~(204)Pb)i-(~(206)Pb/~(204)Pb)i铅同位素演化模式图可知,寄主花岗闪长岩是铜山岭铅锌多金属矿床的重要物质来源,且成矿物质中可能含有寄存在花岗闪长岩中的地幔组分。
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| 关 键 词： | 铜山岭铅锌多金属矿床 成矿时代 成矿物质来源 Sm-Nd等时线年龄 Pb同位素 |
| 收稿时间： | 2016/4/3 0:00:00 |
| 修稿时间： | 2016/8/12 0:00:00 |
Metallogenic epoch and ore-forming material source of the Tongshanling Pb-Zn polymetallic deposit in southeastern Hu'nan Province:Evidence from Sm-Nd isochron age and Pb isotope |
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| WANG Yunfeng,YANG Hongmei,ZHANG Liguo,LU Shansong,YANG Zefei,QIU Xiaofei and LIU Zhongpeng.Metallogenic epoch and ore-forming material source of the Tongshanling Pb-Zn polymetallic deposit in southeastern Hu''nan Province:Evidence from Sm-Nd isochron age and Pb isotope[J].Geologcal Bulletin OF China,2017,36(5):875-884. |
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| Authors: | WANG Yunfeng YANG Hongmei ZHANG Liguo LU Shansong YANG Zefei QIU Xiaofei and LIU Zhongpeng |
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| Institution: | 1. China University of Geosciences, Beijing 100083, China;2. Chinese Academy of Geological Sciences, Beijing 100037, China;3. Isotope Geochemistry Lab, Wuhan Center of Geological Survey, CGS, Wuhan 430205, Hubei, China;4. Research Center of Petrogenesis and Mineralization of Granitoid Rock, CGS, Wuhan 430205, Hubei, China |
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| Abstract: | The Tongshanling Pb-Zn polymetallic deposit is located in the collage part between the southern Hu''nan-northeastern Guangxi depression in the Yangtze Block and the northern Guangdong depression in the Cathaysia Block.It is one of the representa-tive deposits in the Nanling metallogenic province.In order to determine the metallogenic epoch of the Tongshanling Pb-Zn polymetallic deposit,the authors analyzed garnets in mineralized skarn from the deposit using Sm-Nd isotopic system and obtained an isochron age of 173±3Ma which corresponds to early Yanshanian.The metal sulfides were analyzed using Pb isotope compositions and their average ratios of 206Pb/204Pb,207Pb/204Pb,208Pb/204Pb are 18.602,15.701 and 38.729,respectively,indicating that they were mainly derived from relatively uranium lead-enriched and slightly thorium lead-defected upper crust.According to analyzing the dia-gram of (207Pb/204Pb)i-(206Pb/204Pb)i,the hosted granodiorite seems to have been an important material source for the Tongshanling PbZn polymetallic deposit.In addition,ore-forming material probably contained mantle components hosted in the granodiorite of the Tongshanling Pb-Zn polymetallic deposit. |
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| Keywords: | Tongshanling Pb-Zn polymetallic deposit metallogenic epoch ore-forming material source Sm-Nd isochron Pb iso-tope composition |
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