江苏溧水观山高硫型铜铅金矿床40Ar/39Ar 定年及其地质意义

J4 ›› 2010, Vol. 16 ›› Issue (2): 143-148.

• 矿床岩石地球化学及年代学专栏 • 上一篇下一篇

江苏溧水观山高硫型铜铅金矿床⁴⁰Ar/³⁹Ar 定年及其地质意义

梁业恒, 孙晓明, 翟伟, 马春, 吴志强, 丁存根, 王堂喜

1. 中山大学海洋学院，广州 510275；2. 广东省海洋资源与近岸工程重点实验室，广州 510275；
3. 中山大学地球科学系，广州 510275；4. 华东有色地质矿产勘查开发院, 南京 210007

收稿日期:2009-09-14 修回日期:2010-02-11 出版日期:2010-06-20 发布日期:2010-06-20
基金资助:
江苏省有色金属华东地质勘查局委托研究项目与中央高校基本科研业务费专项基金

⁴⁰Ar/³⁹Ar Dating of the Guanshan High Sulphidation Type Cu-Pb-Au Depositin Jiangsu Province and Its Geological Significance

LIANG Ye-Heng, SUN Xiao-Ming, ZHAI Wei, MA Chun, WU Zhi-Qiang, DING Cun-Gen, WANG Tang-Xi　

1. School of Marine Sciences, Sun Yat-sen University, Guangzhou 510275, China; 2. Guangdong Provincial Key Laboratory of Marine Resources and Coastal Engineering, Guangzhou 510275, China; 3. Department of Earth Sciences, Sun Yat-sen University, Guangzhou 510275, China; 4. Eastern China Geological & Mining Organization for Non-ferrous Metals, Nanjing 210007, China

Received:2009-09-14 Revised:2010-02-11 Online:2010-06-20 Published:2010-06-20

摘要/Abstract

摘要：

位于江苏溧水盆地的观山铜铅金矿是典型的高硫型浅成低温热液矿床，但一直缺少精确的成矿年龄数据。对观山矿床近矿围岩绢云母化粗安斑岩中的2件绢云母样品进行40Ar/39Ar定年，得到的年龄分别为（120.8±1.0） Ma和（116.0 ± 1.3） Ma，显示观山铜铅金矿形成于中国东部中生代大规模成矿作用时期。距今125 Ma~115 Ma，整个中国东部地区处于伸展背景下, 发生了大规模的岩浆活动，并形成了包括溧水火山盆地在内的一系列的断陷盆地。溧水盆地在构造运动的强烈影响下，深部岩浆上涌, 形成浅部岩浆房。在热动力的驱动下，富含成矿物质的岩浆水不断与大气降水混合，在近地表形成与粗安斑岩次火山岩有关的浅成低温热液铜多金属矿床。

关键词: ⁴⁰Ar/³⁹Ar定年；浅成低温热液矿床；观山铜铅金矿；中国东部中生代大规模成矿

Abstract:

Guanshan Cu-Pb-Au deposit in Lishui basin of Jiangsu Province is a high sulphidation type epithermal deposit hosted in Late Mesozoic subvolcanic rocks. 40Ar/39Ar dating was performed on two sericite samples collected from sericitized subvolcanic wallrocks of Guanshan deposit. The results yield plateau ages of（120.8±1.0）Ma and（116.0±1.3）Ma，respectively, suggesting that the major mineralization of Guanshan belongs to the large-scale Mesozoic metallogenic event occurred in eastern China. During 125 Ma to 115 Ma, most part of eastern China was affected by extensional tectonic stress, resulting in large-scale magmatism and formed a series of fault-depressed basins, including the Lishui volcanic basin. In this basin, upwelling of deep-seated magma provided magmatic heat, triggered circulation of meteoric water, which mixed with magmatic fluid, and finally deposited the ore minerals in brittle fractures in the trachyte-porphyry wallrocks.

Key words: 40Ar/39Ar dating, high sulphidation type epithermal deposit, Guanshan Cu-Pb-Au deposit, large-scale Mesozoic metallogeny in eastern China

中图分类号:

梁业恒, 孙晓明, 翟伟, 马春, 吴志强, 丁存根, 王堂喜　. 江苏溧水观山高硫型铜铅金矿床⁴⁰Ar/³⁹Ar 定年及其地质意义[J]. J4, 2010, 16(2): 143-148.

LIANG Ye-Heng, SUN Xiao-Ming, ZHAI Wei, MA Chun, WU Zhi-Qiang, DING Cun-Gen, WANG Tang-Xi　. ⁴⁰Ar/³⁹Ar Dating of the Guanshan High Sulphidation Type Cu-Pb-Au Depositin Jiangsu Province and Its Geological Significance[J]. J4, 2010, 16(2): 143-148.

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江苏溧水观山高硫型铜铅金矿床⁴⁰Ar/³⁹Ar 定年及其地质意义

⁴⁰Ar/³⁹Ar Dating of the Guanshan High Sulphidation Type Cu-Pb-Au Depositin Jiangsu Province and Its Geological Significance

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