| 滇东北毛坪铅锌矿床的成矿时代:闪锌矿Rb-Sr定年 |
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| 引用本文： | 沈战武,金灿海,代堰锫,张玙,张海.滇东北毛坪铅锌矿床的成矿时代:闪锌矿Rb-Sr定年[J].高校地质学报,2016,22(2):213. |
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| 作者姓名： | 沈战武 金灿海 代堰锫 张玙 张海 |
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| 摘 要： | 毛坪铅锌矿床是滇东北地区代表性矿床之一,目前尚缺乏精确的成矿年代学数据。该文对选自块状铅锌矿石的4件闪锌矿单矿物样品进行了Rb-Sr同位素定年,获得等时线年龄为321.7±5.8 Ma(MSWD=1.5),表明毛坪铅锌矿床的主成矿作用发生于石炭纪。此外,闪锌矿~(87)Sr/~(86)Sr初始值为0.712166±0.000017,低于大陆地壳~(87)Sr/~(86)Sr平均值(0.719)且高于地幔Sr初始值(0.707),暗示成矿物质主要来源于大陆地壳并混有少量地幔物质。综合前人研究成果,作者认为毛坪铅锌矿属后生矿床,与晚二叠世峨眉山大火成岩省玄武岩浆活动无成因联系,类似于典型的MVT矿床,且滇东北地区可能发育多期铅锌矿化作用。
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| 关 键 词： | Rb-Sr同位素 成矿时代 物质来源 毛坪铅锌矿床 滇东北 |
Mineralization Age of the Maoping Pb-Zn Deposit in the
Northeastern Yunnan Province: Evidence from Rb-Sr
Isotopic Dating of Sphalerites |
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| SHEN Zhanwu,JIN Canhai,DAI Yanpei,ZHANG Yu,ZHANG Hai.Mineralization Age of the Maoping Pb-Zn Deposit in the
Northeastern Yunnan Province: Evidence from Rb-Sr
Isotopic Dating of Sphalerites[J].Geological Journal of China Universities,2016,22(2):213. |
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| Authors: | SHEN Zhanwu JIN Canhai DAI Yanpei ZHANG Yu ZHANG Hai |
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| Abstract: | The Maoping Pb-Zn deposit is a typical ore deposit in the northeastern Yunnan province. However, there is no precise
geochronological data to date. This research performed Rb-Sr isotopic dating on four sphalerite separated from the Maoping deposit,
which yielded isochron age of 321.7 ± 5.8 Ma (MSWD=1.5), indicating that the mineralization age of the Maoping deposit was
Carboniferous. Moreover, the 87Sr/86Sr ratio of sphalerites is determined to be 0.712166 ± 0.000017. This result is lower than that of
continental crust (0.719) and higher than mantle (0.707), implying that the ore-forming metals were derived from continental crust with
a minor amount of mantle-derived materials. Combining with the previous studies, we propose that the Maoping deposit is an epigenetic
deposit similar to the typical MVT Pb-Zn deposits and its mineralization has no link with Permian Emeishan flood basalts. Moreover,
we also suggest that multi-stage Pb-Zn mineralization most likely occurred in the northeastern Yunnan province. |
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| Keywords: | " target="_blank">northeasternYunnanprovincezz')" href="#"> Rb-Srisotopes mineralizationage sourceofore-formingmaterials MaopingPb-Znoredeposit
northeasternYunnanprovince |
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