粤北大宝山矿区船肚钼矿床辉钼矿Re-Os年龄及其地质意义
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摘要
船肚钼矿床是近期在大宝山矿区内发现的大型矽卡岩型钼矿床,对辉钼矿样品进行了Re-Os同位素分析,获得辉钼矿Re-Os同位素模式年龄范围为(163.3±2.5)Ma~(165.2±2.3)Ma,等时线年龄为(165.8±9.2)Ma(MSWD=0.80),表明其形成于中侏罗世,与大宝山石英脉型辉钼矿年龄相一致,同属华南中生代大规模成矿作用的第一成矿阶段(170~150 Ma),是华南中生代大规模岩石圈伸展—减薄背景下的产物。
Chuangdu Mo deposit is a large-scale skarn type deposit discovered recently in the Dabaoshan mining area.Re-Os isotopic composition is analyzed for the molybdenite samples.The Re-Os isotopic model age of molybdenite is in the range of(163.3±2.5)Ma to(165.2±2.3)Ma,and the isochron age is(165.8±9.2)Ma(MSWDU 0.80),which indicates that the molybdenite was formed in the Middle Jurassic,which is consistent with the age of the Dabaoshan molybdenite deposit of quartz vein type.They both belonged to the first stage(170-150 Ma)of large-scale Yanshanian molybdenum metallogenic period in Mesozoic Era.The dynamic background is related to the Mesozoic lithosphere extension-thinning events in South China.
Chuangdu Mo deposit is a large-scale skarn type deposit discovered recently in the Dabaoshan mining area.Re-Os isotopic composition is analyzed for the molybdenite samples.The Re-Os isotopic model age of molybdenite is in the range of(163.3±2.5)Ma to(165.2±2.3)Ma,and the isochron age is(165.8±9.2)Ma(MSWDU 0.80),which indicates that the molybdenite was formed in the Middle Jurassic,which is consistent with the age of the Dabaoshan molybdenite deposit of quartz vein type.They both belonged to the first stage(170-150 Ma)of large-scale Yanshanian molybdenum metallogenic period in Mesozoic Era.The dynamic background is related to the Mesozoic lithosphere extension-thinning events in South China.
引文
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[2]王磊.粤北大宝山钼多金属矿床成矿模式与找矿前景研究[D].武汉:中国地质大学,2010:1-119.
[3]杜安道,何红蓼,殷宁万,等.辉钼矿的铼-锇同位素地质年龄测定方法研究[J].地质学报,1994,68(4):339-347.
[4]杜安道,屈文俊,李超,等.铼-锇同位素定年方法及分析测试技术的进展[J].岩矿测试,2009,28(3):288-304.
[5]杜安道,屈文俊,王登红,等.辉钼矿亚晶粒范围内Re和187 Os的失耦现象[J].矿床地质,2007,26(5):572-580.
[6]杜安道,赵敦敏,王淑贤,等.Carius管溶样-负离子热表面电离质谱准确测定辉钼矿铼-锇同位素地质年龄[J].岩矿测试,2001,20(4):247-252.
[7]屈文俊,杜安道,李超.金川铜镍硫化物样品中锇同位素比值的高精度分析[J].岩矿测试,2009,28(2):219-222.
[8]屈文俊,杜安道.高温密闭溶样电感耦合等离子体质谱准确测定辉钼矿铼-锇地质年龄[J].岩矿测试,2003,22(4):254-262.
[9]屈文俊,杜安道.电感耦合等离子体质谱法测定辉钼矿中Re、Os含量时的质量分馏效应的校正[J].质谱学报,2004,25(增刊1):181-182.
[10]SHIREY S B,WALKER R J.Carius tube digestion for lowblank rhenium-osmium analysis[J].Analytical Chemistry,1995,67(13):2136-2141.
[11]毛景文,谢桂青,李晓峰,等.华南地区中生代大规模成矿作用与岩石圈多阶段伸展[J].地学前缘,2004,11(1):45-55.
[12]毛景文,谢桂青,郭春丽,等.南岭地区大规模钨锡多金属成矿作用:成矿时限及地球动力学背景[J].岩石学报,2007,23(10):2329-2338.
[13]毛景文,谢桂青,郭春丽,等.华南地区中生代主要金属矿床时空分布规律和成矿环境[J].高校地质学报,2008,14(4):510-526.
[14]丘广礼,汤吉方,孙旭荣,等.湘桂地区铜铅锌隐伏矿床研究[M].北京:地质出版社,1994:11-35.
[15]杜国民,梅玉萍,蔡红,等.粤北大宝山钼钨多金属矿床年代学研究及其意义[J].华南地质与矿产,2012,28(3):227-231.