安徽滁州琅琊山铜矿辉钼矿铼-锇同位素定年及其地质意义
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摘要
首次运用铼-锇同位素方法对滁州琅琊山铜矿床中的辉钼矿进行定年。5件辉钼矿样品的模式年龄为(128.9±1.8)Ma~(130.3±1.9)Ma,187Re-187Os等时线年龄为(128.6±2.2)Ma,其加权平均方差(MSWD)为0.45,为滁州琅琊山铜矿床提供了准确的形成时限。分析结果表明,滁州琅琊山铜矿床是早白垩纪(燕山晚期)区域构造-岩浆活动的产物。琅琊山铜矿床辉钼矿中铼含量较高,推断成矿物质主要是壳幔混源,且主要是幔源。
A precise Re-Os age is given for the Langyashan copper deposit in Chuzhou. The model age for five molybdenite samples from the deposit varies from (128.9±1.8) Ma to (130.3±1.9) Ma and the isochron age is (128.6±2.2) Ma,MSWD=0.45. The results indicate that the origin of the deposit is from regional tectno-magmatic activities during the early cretaceous period. The molybdenites from the Langyashan copper deposit have a very high Re content,which indicates that the deposit originated from the mixing of the crust and the mantle sources with the mantle as a primary source.
A precise Re-Os age is given for the Langyashan copper deposit in Chuzhou. The model age for five molybdenite samples from the deposit varies from (128.9±1.8) Ma to (130.3±1.9) Ma and the isochron age is (128.6±2.2) Ma,MSWD=0.45. The results indicate that the origin of the deposit is from regional tectno-magmatic activities during the early cretaceous period. The molybdenites from the Langyashan copper deposit have a very high Re content,which indicates that the deposit originated from the mixing of the crust and the mantle sources with the mantle as a primary source.
引文
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[3]陈毓川,王登红,朱裕生,徐志刚,任纪舜,翟裕生,常印佛,汤中立,裴荣富,滕吉文,邓晋福,胡云中,任天祥,沈保丰,王世称,肖克炎,彭润民,钱壮志,梅燕雄,杜建国,施俊法,张晓华,朱明玉,徐珏,薛春纪.中国成矿体系与区域成矿评价(上册)[M].北京:地质出版社,2007:1008.
[4]杜安道,何红蓼,殷宁万,邹晓秋,孙亚莉,孙德忠,陈少珍,屈文俊.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.
[5]杜安道,赵敦敏,王淑贤,孙德忠,刘敦一.Carius管溶样和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.
[6]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):254-257.
[7]Shirey S B,Walker R J.Carius tube digestion for low blank rhenium-osmium analysis[J].Analytical Chemistry,1995,67:2136-2141.
[8]Ludwig K R.Using isoplot/E X,Version2.0:A geochronological toolkit for Microsoft Excel[M].Berkeley:Geochronological Center(S1),1999.
[9]翟裕生,姚书振,林新多,金福全,周若,万天丰,周宗桂.长江中下游地区铁、铜等成矿规律[J].矿床地质,1992,11(1):1-12.
[10]裴荣富,梅燕雄,毛景文,李进文,傅旭杰,龚羽飞,杨德凤,胡如权.中国中生代成矿作用[M].北京:地质出版社,2008:.
[11]肖玉金.琅琊山铜矿床成矿作用动力学初探[J].西部探矿工程,2003(1):78-79.
[12]王立本,季克俭,陈东.安基山和铜山铜(钼)矿床中辉钼矿的铼-锇同位素年龄及其意义[J].岩石矿物学杂志,1997,16(2):154-158.
[13]黎彤,倪守斌.地球和地壳的化学元素丰度[M].北京:地质出版社,1990:10-25.
[14]Gilos C L,Schilling J H.Variation in rhenium content of molybdenite[C]∥Proceedings of24thInternational Geological Congress.1972,24(10):145-152.
[15]Рехарский B N.Заводска ялаборатория[M].陈寿根,译.1984,T.50,No.1:3-7.
[16]Mao J W,Zhang Z C,Zhang Z H,Du A D.Re-Os isotopic dating of molybdenites in the Xiaoliugou W(Mo)deposit in the northern Qilian mountains and its geological significance[J].Geochim Cosmochim Acta,1999,63(11-12):1815-1818.
[17]Stein H J,Markey R J,Morgan J W,Hannah J L,Scherst啨n A.The remarkable Re-Os chronometer in molybdenite:How and why it works[J].Terra Nova,2001,13(6):479-486.
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