Xu, R and Deng, MG and Li, WC and Lai, CK and Zaw, K and Gao, ZW and Chen, YH and Niu, CH and Liang, G, Origin of the giant Luziyuan Zn-Pb-Fe(-Cu) distal skarn deposit, Baoshan block, SE Tibet: Constraints from Pb-Sr isotopes, calcite C-O isotopes, trace elements and Sm-Nd dating, Journal of Asian Earth Sciences, 205 Article 104587. ISSN 1367-9120 (2021) [Refereed Article]
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Lead isotope compositions are similar among all Luziyuan ore sulfide types, and show positive correlations plotted between the regional Early Cretaceous granites and local wallrocks in both uranogenic and thorogenic diagrams, suggesting a mixed Pb source between intermediate-felsic magmatic fluids and sedimentary wallrocks. This is similar to many coeval northern Baoshan skarn deposits, e.g., Jinchanghe and Hetaoping. Initial 87Sr/86Sr ratios of the pre-ore (0.715919-0.720102), syn-ore (0.713502-0.719259) and post-ore (0.714091-0.720304) minerals lie between those of coeval granitoids and skarn deposits in the region and the average continental crust. This further supports a mixed ore-forming material source, and is suggestive of distal-skarn mineralization type. Syn-ore calcite samples yielded an Early Cretaceous Sm-Nd isochron age (130 +- 15 Ma). Regional tectonic evolution suggests that the Luziyuan mineralization was likely formed under post-collisional extension after the Lhasa-Tengchong accretion onto the Eurasian margin along Baoshan-Sibumasu. Such an extension had most likely induced crustal anatexis and the formation of the ore-causative S-type granites.
|Item Type:||Refereed Article|
|Keywords:||Zn-Pb skarn deposit; Baoshan-Sibumasu block; calcite Sm-Nd dating; Pb-Sr isotopes; post-collisional tectonics; cretaceous SW China|
|Research Division:||Earth Sciences|
|Research Field:||Resource geoscience|
|Objective Division:||Expanding Knowledge|
|Objective Group:||Expanding knowledge|
|Objective Field:||Expanding knowledge in the earth sciences|
|UTAS Author:||Zaw, K (Professor Khin Zaw)|
|Web of Science® Times Cited:||7|
|Deposited By:||Research Performance and Analysis|
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