| 陕西旬阳泗人沟铅锌矿床地质及S、Pb同位素地球化学特征 |
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| 引用本文： | 刘天航,高永宝,魏立勇,张振,唐卫东,贾彬.陕西旬阳泗人沟铅锌矿床地质及S、Pb同位素地球化学特征[J].现代地质,2021,35(6):1597-1607. |
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| 作者姓名： | 刘天航 高永宝 魏立勇 张振 唐卫东 贾彬 |
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| 作者单位： | 中国地质调查局 西安矿产资源调查中心,陕西 西安 710000 |
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| 基金项目： | 中国地质调查局地质调查项目“陕西旬阳-镇坪地区铅锌矿产地质调查”(DD20208009);中国地质调查局地质调查项目“北山地区月牙山-合黎山萤石铜钼矿调查评价”(DD20211552) |
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| 摘 要： | 陕西旬阳泗人沟铅锌矿床位于南秦岭褶皱系之大羊山复向斜南翼,赋存在上志留统水洞沟组第二岩性段的粉砂质千枚岩中。矿体受控于层间破碎带和劈理带,呈层状、似层状、透镜状产出。矿石矿物以闪锌矿、方铅矿、黄铁矿、磁黄铁矿和黄铜矿为主;矿石结构主要为它形-半自形粒状集合体结构、交代结构和固溶体分离结构;矿石构造主要为块状、条带状、浸染状和细脉状。激光剥蚀多接收等离子体质谱原位S同位素组成分析结果显示,矿石硫化物的硫同位素组成比较稳定,样品的δ34S值主要介于0.17‰~2.03‰之间,具有塔式分布特征,反映硫主要源于地幔和深部地壳,也有少量地层硫参与。9件矿石硫化物样品的206Pb/204Pb值为17.198~18.213,平均17.845;207Pb/204Pb值为15.564~15.627,平均15.610; 208Pb/204Pb值为37.982~38.471,平均38.206;反映铅同位素总体较稳定,变化范围较小,铅同位素主要源于上地壳,也有少量地幔铅参与。综合矿床地质、地球化学特征,认为泗人沟铅锌矿床成因类型属于后生热液充填交代型。
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| 关 键 词： | 地质特征 S、Pb同位素 矿床成因 泗人沟铅锌矿 秦岭造山带 |
| 收稿时间： | 2021-05-10 |
| 修稿时间： | 2021-10-10 |
Geological Characteristics and S-Pb Isotope Geochemistry of the Sirengou Pb-Zn Deposit in Xunyang,Shaanxi Province |
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| LIU Tianhang,GAO Yongbao,WEI Liyong,ZHANG Zhen,TANG Weidong,JIA Bin.Geological Characteristics and S-Pb Isotope Geochemistry of the Sirengou Pb-Zn Deposit in Xunyang,Shaanxi Province[J].Geoscience——Journal of Graduate School,China University of Geosciences,2021,35(6):1597-1607. |
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| Authors: | LIU Tianhang GAO Yongbao WEI Liyong ZHANG Zhen TANG Weidong JIA Bin |
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| Institution: | Xi'an Center of Mineral Resources Survey, China Geological Survey, Xi'an, Shaanxi 710000, China |
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| Abstract: | The Sirengou Pb-Zn deposit, located in the southern limb of the Dayangshan syncline of the Southern Qinling Fold System, is hosted in the silty phyllite of the Upper Silurian Shuidonggou Formation (2nd member).The orebodies are layered, stratoid or lenticular in the interlayer fracture zones.Metallic minerals mainly include sphalerite, galena, pyrite, pyrrhotite, and chalcopyrite.The ores are massive, band, disseminated or veined, and the ore minerals are euhedral-subhedral granular, aggregate, or have replacement or solid solution texture.LA-MC-ICP-MS in-situ sulfur isotope analyses show that the ore sulfides have relatively stable isotopic compositions, with the δ 34S values of samples (0.17‰-2.03‰) showing normal distribution in the δ34S histogram, which indicates that the sulfur was sourced from the mantle and/or deep crust with minor wallrock input.Nine sulfide samples yielded 206Pb/204Pb=17.198-18.213 (avg.17.845), 207Pb/204Pb=15.564-15.627 (avg.15.610) and 208Pb/204Pb=37.982-38.471 (avg.38.206).Lead isotope compositions of the ores are also similar (narrow-range), indicating that the lead was derived from the upper crust with minor mantle input.Combined with the geological and geochemical characteristics, we suggest that the Sirengou deposit belongs to epigenetic hydrothermal filling-metasomatic-type. |
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| Keywords: | geological characteristic sulfur and lead isotope ore genesis Sirengou Pb-Zn deposit Qinling orogen |
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