粤西庙山铜多金属矿床硫化物微量元素LA-ICP-MS原位测定及S同位素对矿床成因的制约
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国家自然科学基金项目(面上项目,重点项目,重大项目)


Sulfide Microanalysis and S Isotope of the Miaoshan Cu Polymetallic
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    摘要:

    庙山铜多金属矿床是在粤西阳春盆地内新近发现的一处铜多金属矿床。矿体主要呈似层状和透镜状产于泥盆系的陆源碎屑岩和含泥质的碳酸盐岩中。本文以矿石矿物黄铁矿和闪锌矿为研究对象,采用LA-ICP-MS原位微区分析新技术对其微量元素特征进行研究。结果表明,庙山铜多金属矿床中黄铁矿以富Se、Te和As,贫Ni元素为特征,其Co/Ni和S/Se比值特征指示其成因与岩浆热液型矿床密切相关;闪锌矿的微量元素组成指示其主要形成于中高温环境,以富Mn、In、Se,贫Ga、Ge、Tl等元素为特征,总体与国外一些典型的矽卡岩型矿床(如Baita Bihor、Majdanpek、Ocna de Fier和Valea Seaca)相似。同时,闪锌矿的部分微量元素比值(如Zn/Cd、Ga/In等)以及相关的微量元素图解(如Ge-In, Ge-Se等)均表明庙山矿床的成因类型与矽卡岩型矿床一致。硫同位素测试结果表明,矿石的δ34S值较为集中(-0.4‰ ~ +2‰),平均0.69‰,具有较为明显的塔式分布特征,反映成矿物质具有岩浆来源的特征。以地质现象为基础,结合硫化物原位微区分析和硫同位素数据,我们认为庙山铜多金属矿床属于与岩浆热液有关的矽卡岩型矿床。

    Abstract:

    The Miaoshan is a Cu polymetallic deposit that was newly discovered from Yangchun Basin of western Guangdong Province. The ore bodies occur in Devonian terrigenous clastic rocks and argillaceous carbonate rocks in stratoid and lenticular forms. By using LA-ICP-MS new technology of situ microanalysis, the authors investigated the trace elements characteristics of pyrite and sphalerite. It shows that the trace elements of pyrite is characterized by rich Se, Te, As, while poor Ni. Its Co/Ni and S/Se ratios indicate that the pyrite is closely related to magmatic hydrothermal type deposit. The sphalerite formed on medium-high temperature condition characterized by rich Mn, In, Se, while poor Ga, Ge and Tl etc. The whole trace elements compositional features of sphalerite is the same as that of some typical foreign skarn deposits (e.g. Baita Bihor, Majdanpek, Ocna de Fier and Valea Seaca). Partial trace elements ratios (such as Zn/Cd, Ga/In etc.) and related diagrams (such as Ge-In, Ge-Se etc.) of the sphalerite indicate that the genesis of Miaoshan Cu polymetallic deposit is agreement with skarn-type deposits. S isotopic results show that δ34S value of the ores is more concentrated (-0.4‰ ~ +2‰), with an average at 0.69‰, showing tower-shaped distribution effect, which reflects that the characteristics ore-forming materials originated from magmatic origin. Base on field geological features, coupled with the data of sulfide in situ microanalysis and S isotope, we suggest that the Miaoshan Cu polymetallic deposit belongs to skarn deposits.

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邢波,郑伟,欧阳志侠,吴晓东,林玮鹏,田云.2016.粤西庙山铜多金属矿床硫化物微量元素LA-ICP-MS原位测定及S同位素对矿床成因的制约[J].地质学报,90(5):971-986.
XING Bo, ZHENG Wei, OUYANG Zhixia, WU Xiaodong, LIN Weipeng, TIAN Yun.2016. Sulfide Microanalysis and S Isotope of the Miaoshan Cu Polymetallic[J]. Acta Geologica Sinica,90(5):971-986.

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  • 收稿日期:2015-09-16
  • 最后修改日期:2016-04-15
  • 录用日期:2016-04-20
  • 在线发布日期: 2016-05-18
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