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Syn-collisional magmatism at the Longgen Pb-Zn deposit, western Nyainqentanglha belt, Tibet: Petrogenesis and implications for regional polymetallic metallogeny

文献类型：期刊论文

作者Gao, Shunbao5; Chen, Xin4; Cheng, Shanshan3; Zhang, Yongchao5; Zheng, Youye4,5; Jiang, Junsheng1,2; Wu, Song4; Jiang, Xiaojia4
刊名ORE GEOLOGY REVIEWS
出版日期2020-11-01
卷号126页码:15
ISSN号0169-1368
关键词Syn-collisional magmatism Pb-Zn deposit Rb-Sr isotopic dating Sr-Nd-Pb-Hf isotopes Longgen Tibet
DOI10.1016/j.oregeorev.2020.103730
英文摘要Syn-collisional orogeny generally lacks adequate fluids and has a low potential to form magmatic hydrothermal ore deposits. However, some syn-collisional Pb-Zn deposits have been recognized in the Nyainqentanglha polymetallic belt (NPB), central Lhasa subterrane and ore-related magma petrogenesis and the metallogenic geodynamic setting is limited. In this study, detailed petrology, geochemical and geochronological data of ore -related syn-collisional granite porphyries are evaluated to constrain the timing of mineralization and discuss the genesis and evolution of ore-related magma using the Longgen skarn Pb-Zn deposit as a case study. Zircon U-Pb dating of ore-related porphyries provides a weighted mean age of 61.2 +/- 0.8 Ma, which is slightly earlier than the sphalerite Rb-Sr age of 59.1 +/- 3.0 Ma, indicating that a Paleocene Pb-Zn mineralization event occurred during syn-collisional orogeny. The porphyries have high SiO2, K2O + Na2O, and are enriched in Rb, Th, U, Pb, LREEs, and A/CNK (0.94-1.15), but have low P2O5 and are depleted in Nb, Ta, and Ti. This suggests that the Longgen granite porphyries are metaluminous to weakly peraluminous high-K calc-alkaline "arc-like" granites. These porphyries have highly radiogenic isotopic compositions with (Sr-87/Sr-86)(i) 0.709513-0.713587, (Pb-207/ Pb-204)(i) 15.657-15.713, and (Pb-208/Pb-204)(i) 38.964-39.163, but low eNd(t) values from - 6.7 to - 6.0, as well as negative zircon eHf(t) values from - 5.1 to - 3.2, corresponding to TDM2(Nd) ages of 1.37 to 1.42 Ga and zircon Hf TDMc ages of 1.30 to 1.42 Ga. This demonstrates that the Longgen granite porphyries may have been generated by the partial melting of Mesoproterozoic basement continental crust materials with significant amounts (30-50%) of mantle-derived melt input. Paleocene-Eocene (65-45 Ma) magmatic rocks associated with Pb-Zn and Fe-Cu deposits are compiled in the NPB. The Pb-Zn ore-related granitoids have relatively lower whole-rock eNd(t) and zircon eHf(t) values, higher (Sr-87/Sr-86)i values, and older TDMC ages than the coeval granitoids associated with Fe-Cu mineralization. This indicates that mantle material is more critical for the development of Fe-Cu ore-related granitoids than granitoids associated with Pb-Zn mineralization. The final results show that different sources of Paleocene-Eocene syn-collisional magma in the NPB are beneficial for different mineralization events during the syn-collisional orogeny of the Indian and Asian plates.
WOS关键词A-TYPE GRANITES ; MANTLE SOURCE CHARACTERISTICS ; CONTINENTAL-CRUST GROWTH ; CENTRAL LHASA TERRANE ; PORPHYRY CU DEPOSITS ; LACHLAN FOLD BELT ; IN-SITU ANALYSIS ; S-TYPE GRANITES ; HF-O ISOTOPES ; SOUTHERN TIBET
资助项目Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan)[2019132] ; China Geological Survey[DD20190159-33] ; National Key Research and Development Program of China[2016YFC0600300]
WOS研究方向Geology ; Mineralogy ; Mining & Mineral Processing
语种英语
出版者ELSEVIER
WOS记录号WOS:000589207000003
资助机构Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) ; China Geological Survey ; China Geological Survey ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) ; China Geological Survey ; China Geological Survey ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) ; China Geological Survey ; China Geological Survey ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) ; Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) ; China Geological Survey ; China Geological Survey ; National Key Research and Development Program of China ; National Key Research and Development Program of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/98718]  
专题中国科学院地质与地球物理研究所
通讯作者Chen, Xin
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
2.Wuhan Surveying Geotech Res Inst Co LTD MCC, Wuhan 430080, Peoples R China
3.Sichuan Inst Geol Engn Invest Grp Co LTD, Chengdu 610000, Peoples R China
4.China Univ Geosci, Sch Earth Resources, Wuhan 430074, Peoples R China
5.China Univ Geosci, Inst Geol Survey, Wuhan 430074, Peoples R China
推荐引用方式
GB/T 7714		 Gao, Shunbao,Chen, Xin,Cheng, Shanshan,et al. Syn-collisional magmatism at the Longgen Pb-Zn deposit, western Nyainqentanglha belt, Tibet: Petrogenesis and implications for regional polymetallic metallogeny[J]. ORE GEOLOGY REVIEWS,2020,126:15.
APA Gao, Shunbao.,Chen, Xin.,Cheng, Shanshan.,Zhang, Yongchao.,Zheng, Youye.,...&Jiang, Xiaojia.(2020).Syn-collisional magmatism at the Longgen Pb-Zn deposit, western Nyainqentanglha belt, Tibet: Petrogenesis and implications for regional polymetallic metallogeny.ORE GEOLOGY REVIEWS,126,15.
MLA Gao, Shunbao,et al."Syn-collisional magmatism at the Longgen Pb-Zn deposit, western Nyainqentanglha belt, Tibet: Petrogenesis and implications for regional polymetallic metallogeny".ORE GEOLOGY REVIEWS 126(2020):15.

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来源：地质与地球物理研究所

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