Geology and geochronology of the Jinmuguo Mo polymetallic deposit: Implications for the metallogeny of the Bangongco- Nujiang belt of Tibet
Geology and geochronology of the Jinmuguo Mo polymetallic deposit: Implications for the metallogeny of the Bangongco- Nujiang belt of Tibet
复制标题
金木果钼多金属矿床地质与年代学：对西藏班公错-怒江带成矿的启示
DOI：
10.1016/j.oregeorev.2021.104460
复制
发表时间：
2021-12
影响因子：
3.3
通讯作者：
He Liang
中科院分区：
文献类型：
--
作者：
Lin Bin;Zhang Xiangguo;Tang Pan;Wang Liqiang;Santosh M.;Xi Zha;Zhang Xiaoxu;Qi Jing;He Liang
班公湖-怒江成矿带位于青藏高原中部，其成因与班公湖-怒江洋的构造演化密切相关。虽然西部和中部的BNMB的成矿作用是很好的理解，这个带的东部还没有得到太多的关注。金木果存款矿床是新近发现的斑岩型钼多金属存款矿床。本文介绍了该存款矿床的地质、年代学和同位素特征。与成矿有关的花岗斑岩的锆石U-Pb年龄为118.6 ± 0.7Ma（n = 20），辉橄榄岩的Re-Os年龄为117.9 ± 2.4Ma（n = 4）。这些新的年龄数据表明，岩浆活动和成矿作用在早白垩世是同期的。此外，金木果存款硫化物矿物的硫同位素值变化范围较窄，为2‰ ~ 4‰，为岩浆硫源。硫化物的铅同位素特征表明铅的来源是不均一的。而H-O同位素组成（δD值为−84.8‰ ~ −69.1‰，δ 18 OH 2 O值为4.2‰ ~ 4.7‰）则与岩浆热液为主的热液相一致。金木果存款矿床是与早白垩世长英质岩浆活动有关的斑岩型钼多金属存款矿床。将后者与北大西洋微生物带的其他矿床进行比较表明，整个带有可能容纳各种与岩浆弧有关的矿物存款类型。
The genesis of the Bangongco-Nujiang metallogenic belt (BNMB), located in the central portion of the Qinghai-Tibet Plateau, is closely related to the tectonic evolution of the Bangongco-Nujiang Ocean. Although the metallogeny of the western and central BNMB is well understood, the eastern part of this belt has not received much attention to date. The Jinmuguo deposit, the subject of this study, is a recently discovered porphyry Mo polymetallic deposit in the eastern BNMB. Here we present the geology, geochronology and isotopic characteristics of this deposit. Zircon U-Pb dating of the ore-related granite porphyry yielded an age of 118.6 ± 0.7 Ma (n = 20) whilst Re-Os analyses of molybdenite constrain the timing of mineralization as 117.9 ± 2.4 Ma (n = 4). These new age data suggest that magmatism and mineralization were coeval during early Cretaceous. In addition, the S isotope values of sulfide minerals from the Jinmuguo deposit show a narrow range of 2‰ to 4‰, suggesting a magmatic sulfur source. The Pb isotopic character of sulfides indicates a heterogenous lead source. Whilster the H-O isotopic composition (δD values −84.8‰ to −69.1‰, δ18OH2Ovalues 4.2‰ to 4.7‰) is consistent with a dominantly magmatic hydrothermal fluid. Overall, our study of the mineralization and alteration characteristics suggests that the Jinmuguo deposit is a porphyry Mo polymetallic deposit related to early Cretaceous felsic magmatism. A comparison of the latter with the other deposits of the BNMB suggests that the entire belt has potential to host a diverse range of magmatic arc-related mineral deposit types.
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DOI：
--
发表时间：
2002
期刊：
--
影响因子：
--
作者：
Xiao Run
通讯作者：
Xiao Run
影响因子：
1.8
作者：
林彬;Lin Bin;方向;Fang Xiang;王艺云;Wang Yiyun;杨欢欢;Yang Huanhuan;贺文;Heng-Yi Wen
通讯作者：
林彬;Lin Bin;方向;Fang Xiang;王艺云;Wang Yiyun;杨欢欢;Yang Huanhuan;贺文;Heng-Yi Wen
影响因子：
2.9
作者：
R. Zartman;B. Doe
通讯作者：
R. Zartman;B. Doe
DOI：
--
发表时间：
2012
期刊：
--
影响因子：
--
作者：
Yang Yong-qiang;M. Key
通讯作者：
Yang Yong-qiang;M. Key
影响因子：
3.3
作者：
Yong Wang;Juxing Tang;Liqiang Wang;J. Huizenga;M. Santosh;Silun Zheng;Yu Hu;Teng Gao
通讯作者：
Yong Wang;Juxing Tang;Liqiang Wang;J. Huizenga;M. Santosh;Silun Zheng;Yu Hu;Teng Gao