粤北大宝山铜多金属矿床中层状铜矿体的成矿时代及其成因意义
Metallogenic chronology of the stratiform Cu orebody in the Dabaoshan Cu polymetallic deposit, northern Guangdong Province and its geological significance
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摘要: 在空间上，与斑岩-矽卡岩型矿体密切相关的层状矿体的成因一直是我国矿床学研究的一个焦点问题。长期以来有海底喷流成因和斑岩-矽卡岩型成因的两种主要分歧。此次工作发现在粤北大宝山层状铜矿体中存在辉钼矿和蚀变形成的绢云母，本文通过辉钼矿Re-Os等时线测年以及绢云母Ar-Ar测年对该矿床中层状铜矿体的成矿时代进行限定，获得大宝山层状铜矿体9件辉钼矿样品Re-Os等时线年龄为166.0±3.0Ma、模式年龄为165.7±2.3Ma~163.4±2.4Ma（2σ）、加权平均值为164.8±0.8Ma，2件绢云母样品的Ar-Ar坪年龄分别为166.6±1.6Ma和171.7±2.0Ma，反等时线年龄分别为167.0±2.0Ma和161.7±1.7Ma，由于Ar过剩，出现一个过高值（171.7±2.0Ma），其他年龄值在误差范围内与辉钼矿Re-Os等时线年龄基本一致。这些结果可以厘定大宝山层状铜矿体的年龄，表明斑岩-矽卡岩与层状铜矿体为同一成矿系统，成因上与侏罗纪花岗质岩浆岩侵位密切相关。结合前人的研究成果，认为位于钦杭带边缘的粤北大宝山铜多金属矿床与古太平洋板块俯冲具有成因联系。
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关键词:
- 辉钼矿Re-Os年龄 /
- 绢云母Ar-Ar年龄 /
- 成矿作用 /
- 大宝山铜多金属矿床 /
- 华南地区
Abstract: The genesis of the stratiform copper orebody in the Dabaoshan copper polymetallic deposits has long been a hot topic with two major models, namely, the submarine volcanic hydrothermal sedimentation model and the porphyry-skarn model. This study takes the Dabaoshan copper polymetallic deposit in northern Guangdong as an example to analyze its metallogenic ages using molybdenite Re-Os dating and sericite Ar-Ar dating methods. In this study we obtain molybdenite Re-Os model ages ranging from 165.7±2.3Ma to 163.4±2.4Ma (2σ, n=9), isochron age of 141.1±1.4Ma and weighted mean age of 164.8±0.8Ma. Meanwhile, we obtain sericite Ar-Ar ages of 166.6±1.6Ma (DB011) and 171.7±2.0Ma (DB020), with the corresponding reverse isochron ages of 167.0±2.0Ma and 161.7±1.7Ma. Due to excess argon, the age of 171.7±2.0Ma is a little bit higher but all the other Ar-Ar ages are the same as the Re-Os isochron age. Combining with previous studies, the mineralization age of the Dabaoshan Cu ore deposit is coeval with the large scale lithosphere extension stage and mineralization in South China, indicating that the Dabaoshan Cu ore deposit was formed as a result of lithosphere extension and thinning events of the same period. -
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