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Robust dating of Pb-Zn skarn systems by LA-ICP-MS garnet U-Pb geochronology

文献类型：期刊论文

作者Li, Jiadai2; Xu, Jing3; Wu, Shitou4; Cook, Nigel J.5; Ciobanu, Cristiana L.5; Gilbert, Sarah1; Wang, Liyuan3
刊名ORE GEOLOGY REVIEWS
出版日期2023-08-01
卷号159页码:16
关键词LA-ICP-MS U-Pb geochronology Garnet Pb-Zn skarn Nyainqe ntanglha metallogenic belt Tibet
ISSN号0169-1368
DOI10.1016/j.oregeorev.2023.105565
英文摘要Lawu and Yaguila are two Pb-Zn skarn deposits in the eastern Nyainqentanglha metallogenic belt, central Lhasa subterrane, Tibet. The genesis of Pb-Zn deposits in this belt and the crustal processes leading to their formation remain ill-constrained, mostly because of the lack of precise mineralization ages. We integrate textural information, geochemistry, and in-situ garnet U-Pb geochronology to constrain the timing and genesis of Pb-Zn mineralization. Garnets from the two deposits display oscillatory compositional zoning (And14Gr86 to And100) and contain variable U contents (0.07-5.3 ppm). Aluminum-rich garnet displays a chondrite-normalized rare earth element (REE) fractionation pattern in which LREEs are depleted relative to flattish HREE segments. In contrast, Fe-rich garnet shows LREE-enriched, relatively HREE-poor patterns with positive Eu-anomalies. Uranium concentration is correlated with total REE and Fe components in garnets, implying that U incorporation is largely controlled by coupled substitution mechanisms. The same garnets also contain measurable contents of other metals (up to hundreds of ppm), such as Sn, W, and In. The distribution and fractionation of major and trace elements in zoned garnets record periodic fluid pluses with different compositions during hydraulic fracturing. The new garnet U-Pb data show that the Yaguila deposit formed between 68.5 & PLUSMN; 3.4 and 65.0 & PLUSMN; 4.7 Ma, and the Lawu deposit formed at 54.6 & PLUSMN; 2.9 Ma. Within the geochronological framework of igneous rocks and Pb-Zn mineralization in the Nyainqentanglha metallogenic belt, the new garnet ages suggest a magmatichydrothermal origin for related mineralization, with the causative magma likely derived from partial melting of ancient continental material due to rollback and subsequent breakoff of the Neo-Tethys oceanic slab during India-Asia continental collision. This study highlights the opportunities offered by garnet U-Pb dating for elucidating the formation age and ore genesis of base metal skarn systems.
WOS关键词NW CHINA CONSTRAINTS ; CENTRAL LHASA TERRANE ; EASTERN TIANSHAN ; GANGDESE BELT ; DEPOSIT ; GENESIS ; DISTRICT ; TIBET ; GEOCHEMISTRY ; ANDRADITE
资助项目National Natural Science Foundation of China[41802098] ; National Natural Science Foundation of China[42230807]
WOS研究方向Geology ; Mineralogy ; Mining & Mineral Processing
语种英语
WOS记录号WOS:001047944300001
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/111435]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Xu, Jing; Wu, Shitou
作者单位1.Univ Adelaide, Adelaide Microscopy, Adelaide, SA 5005, Australia
2.Chengdu Univ, Sch Tourism & Culture Ind, Chengdu 610106, Peoples R China
3.Fuzhou Univ, Zijin Sch Geol & Min, Fuzhou 350108, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
5.Univ Adelaide, Sch Chem Engn, Adelaide, SA 5005, Australia
推荐引用方式
GB/T 7714		 Li, Jiadai,Xu, Jing,Wu, Shitou,et al. Robust dating of Pb-Zn skarn systems by LA-ICP-MS garnet U-Pb geochronology[J]. ORE GEOLOGY REVIEWS,2023,159:16.
APA Li, Jiadai.,Xu, Jing.,Wu, Shitou.,Cook, Nigel J..,Ciobanu, Cristiana L..,...&Wang, Liyuan.(2023).Robust dating of Pb-Zn skarn systems by LA-ICP-MS garnet U-Pb geochronology.ORE GEOLOGY REVIEWS,159,16.
MLA Li, Jiadai,et al."Robust dating of Pb-Zn skarn systems by LA-ICP-MS garnet U-Pb geochronology".ORE GEOLOGY REVIEWS 159(2023):16.

入库方式： OAI收割

来源：地质与地球物理研究所

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