| 西藏蒙亚啊矽卡岩铅锌矿床的成因探讨 |
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| 引用本文： | 程顺波,庞迎春,曹亮.西藏蒙亚啊矽卡岩铅锌矿床的成因探讨[J].华南地质与矿产,2008(3):50-56. |
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| 作者姓名： | 程顺波 庞迎春 曹亮 |
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| 作者单位： | 中国地质大学研究生院,武汉,430074 |
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| 基金项目： | 资源学院陆建培老师为本文的矿石镜下鉴定提供硬件设施,西藏华夏矿业公司的张世东高级工程师,严军、康亦明工程师提供了很多野外帮助,在此一并表示感谢! |
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| 摘 要： | 蒙亚啊铅锌矿床是西藏巨型冈底斯成矿带东段境内一个重要的铅锌（银）矿床。矿床地质-同位素地球化学综合研究表明，矿区中新世晚期花岗斑岩对矿床的形成起到决定性的作用，矿质主要来源于岩浆热液，矿床属岩浆热液交代成因类型。矿石硫δ^14S=-3．24-＋0．71‰，呈塔式分布，峰值为0‰；矿石铅同位素组成位于花岗斑岩铅和来菇组地层铅之间，但矿石铅更靠近花岗斑岩铅。矿区花岗斑岩的锆石激光电感耦合等离子质谱（LA—ICP—MS）年龄为13．9±0．27Ma。表明蒙亚啊矿床形成于中新世晚期。
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| 关 键 词： | 蒙亚啊 铅锌矿床 矿床成因 西藏 |
The Genesis of Mengya'a Skarn-Type Lead-Zinc Deposit, Tibet |
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| CHENG Shun-bo,PANG Ying-chun,CAO Liang.The Genesis of Mengya'a Skarn-Type Lead-Zinc Deposit, Tibet[J].Geology and Mineral Resources of South China,2008(3):50-56. |
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| Authors: | CHENG Shun-bo PANG Ying-chun CAO Liang |
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| Institution: | (Postgraduate School, China University of Geosciences; Wuhan 430074, Hubei, China) |
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| Abstract: | Mengya＇a lead - zinc deposit is a typical skarn - type deposit, located in eastern of the giant Gangdise metallogenic belt. Synthesis of deposit geology and isotopic geochemistry show that late Oligocenic granitic porphyry in ore district controls the ore - forming process, this deposit belonging to magmatic hydro- thermal matesomatic type and mineralizing elements coming from magmatic hydrothermal system. Ore sulfur has a composition of δ34S = -3.24 - ＋ 0.71‰, which close to zero and exhibit a tower- shaped distribution. The lead isotopes of ores line between Laigu Formation and granitic porphyry, but close to the later. LA ICP MS zircon age of granitic porphyry is 13.9 ±0.27Ma, which shows that Mengya＇a deposit is formed in. |
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| Keywords: | Mengya＇a lead - zinc deposit origin Tibet |
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