河南内乡县板厂铜多金属矿辉钼矿Re-Os年代学及硫、铅同位素地球化学特征
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摘要
板厂铜多金属矿床是东秦岭造山带近年来找矿取得重大突破的一处以铜为主的多金属矿床,其上部发育脉状铜铅锌银矿化,下部发育铜钼矿化.通过对矿石中辉钼矿开展Re-Os同位素定年、对花岗岩进行锆石U-Pb定年,结合硫化物的硫、铅同位素特征,讨论了矿床的成矿时代、矿床成因及成矿动力学背景.6件辉钼矿Re-Os模式年龄为149.8±2.4 Ma～151.5±2.3Ma,加权平均年龄为150.7±1.9Ma,等时线年龄为151.0±4.6 Ma,显示成矿作用发生于晚侏罗世.矿区南部纸坊沟花岗斑岩体的锆石U-Pb年龄为148±1 Ma,说明区域上存在成矿期的花岗岩浆活动.11件硫化物硫同位素δ34 SV-CDT值介于-1.2‰～1.2‰,显示深源岩浆硫的特征,206Pb/204Pb值为17.178～17.709,207 Pb/204 Pb值为15.430～15.528,208 Pb/204 Pb值为37.476～37.847,与北秦岭燕山期花岗岩和南秦岭地壳基底具一致的铅同位素组成,明显不同于北秦岭地层的铅同位素,成矿物质来源于燕山期岩浆岩.结合矿床地质特征,研究表明板厂铜多金属矿床为与燕山期岩浆有关的类矽卡岩型-热液脉型铜多金属矿床,属岩浆热液成矿系统,形成于岩石圈减薄的构造背景.
A great breakthrough has been achieved in prospecting in Banchang copper polymetallic deposit,East Qinling orogenic belt in recent years,which is characterized by obvious mineralization zoning in the mining area.The Cu,Pb,Zn and Ag mineralizations are developed in the upper part,and the Cu and Mo mineralizations are located in the lower part of the mining area.With Re-Os isotopic dating of molybdenite,LA-ICP-MS zircon U-Pb dating of granite rocks,sulfur and lead isotopic tracing of metal sulfide,the metallogenic time,ore genesis and metallogenic dynamic setting of the deposit are discussed in this study.Re-Os model ages of six molybdenite samples are 149.8±2.4Ma to 151.5±2.3Ma,with the weighted average age of 150.7±1.9Ma and isochron age of 151.0±4.6 Ma,indicating that the metallogenic epoch was Late Jurassic.The zircon U-Pb age of Zhifanggou granite porphyry which is located to the south of Banchang deposit is 148±1Ma,indicating that magmatic activities occurred during the metallogenic period.Elevenδ34SV-CDTvalues for sulfides range from-1.2‰to+1.2‰,and the values are interpreted to reflect a deep magmatic source of the sulfur.In addition,the results show that 206Pb/204 Pb values range from17.178 to 17.709,207Pb/204 Pb values range from 15.430 to 15.528 and 208Pb/204 Pb values range from 37.476 to 37.847,which are similar to lead isotope values of Yanshan Period granites in North Qinling and the crustal basement of South Qinling but very different from lead isotope values of the North Qinling strata.It is concluded that Banchang copper polymetallic deposit belongs to skarn-like type-hydrothermal vein type deposit which is related to Yanshannian magmatic activity,and it formed in the lithospheric thinning setting of East Qinling.
A great breakthrough has been achieved in prospecting in Banchang copper polymetallic deposit,East Qinling orogenic belt in recent years,which is characterized by obvious mineralization zoning in the mining area.The Cu,Pb,Zn and Ag mineralizations are developed in the upper part,and the Cu and Mo mineralizations are located in the lower part of the mining area.With Re-Os isotopic dating of molybdenite,LA-ICP-MS zircon U-Pb dating of granite rocks,sulfur and lead isotopic tracing of metal sulfide,the metallogenic time,ore genesis and metallogenic dynamic setting of the deposit are discussed in this study.Re-Os model ages of six molybdenite samples are 149.8±2.4Ma to 151.5±2.3Ma,with the weighted average age of 150.7±1.9Ma and isochron age of 151.0±4.6 Ma,indicating that the metallogenic epoch was Late Jurassic.The zircon U-Pb age of Zhifanggou granite porphyry which is located to the south of Banchang deposit is 148±1Ma,indicating that magmatic activities occurred during the metallogenic period.Elevenδ34SV-CDTvalues for sulfides range from-1.2‰to+1.2‰,and the values are interpreted to reflect a deep magmatic source of the sulfur.In addition,the results show that 206Pb/204 Pb values range from17.178 to 17.709,207Pb/204 Pb values range from 15.430 to 15.528 and 208Pb/204 Pb values range from 37.476 to 37.847,which are similar to lead isotope values of Yanshan Period granites in North Qinling and the crustal basement of South Qinling but very different from lead isotope values of the North Qinling strata.It is concluded that Banchang copper polymetallic deposit belongs to skarn-like type-hydrothermal vein type deposit which is related to Yanshannian magmatic activity,and it formed in the lithospheric thinning setting of East Qinling.
引文
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Hou,H.X.,Zhang,D.H.,Zhang,R.Z.,2016.The Chronology,Geochemical Characteristics and Geological Significance of the Mesozoic Shiyaogou Hidden Granite at the East Qinling.Earth Science,41(10):1665-1682(in Chinese with English abstract).https://doi.org/10.3799/dqkx.2016.122
Gilder,S.,Courtillot,V.,1997.Timing of the North-South China Collision from New Middle to Late Mesozoic Paleomagnetic Data from the North China Block.Journal of Geophysical Research:Solid Earth,102(B8):17713-17727.https://doi.org/10.1029/97jb01201
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Lu,F.X.,Wang,C.Y.,Hu,B.Q.,et al.,2003.Structure of the Lower Crust and Detachment and Subduction of the Lithosphere of the South Qinling.Geology in China,30(2):113-119(in Chinese with English abstract).
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