Citation: | Yong Huang, Ming-hua Ren, Wei Liang, Guang-ming Li, Kelly Heilbronn, Zuo-wen Dai, Yi-yun Wang, Li Zhang, 2020. Origin of the Oligocene Tuolangla porphyry-skarn Cu-W-Mo deposit in Lhasa terrane, southern Tibet, China Geology, 3, 369-384. doi: 10.31035/cg2020047 |
Although some porphyry-skarn deposits occur in post-collisional extensional settings, the post-collisional deposits remain poorly understood. Here the authors describe the igneous geology, and mineralization history of Tuolangla, a newly-discovered porphyry-skarn Cu-W-Mo deposit in southern Tibet that belongs to the post-collisional class. The deposit is associated with Lower Cretaceous Bima Formation. It was intruded by granodiorite porphyry intrusions at about 23.1 Ma. Field investigation indicated that mineralization is spatially and temporally associated with granodiorite porphyry. Molybdenite yielded a Re-Os weighted mean age of 23.5 ± 0.3 Ma and is considered to represent the age of skarn mineralization at the deposit. The δ34S values of sulfides, concentrated in a range between 0.6‰ to 3.4‰, show that the sulfur has a homogeneous source with characteristics of magmatic sulfur. The Pb isotopic compositions of sulfides indicate that ore-forming metal materials were derived from the mantle and ancient crust. The granodiorite porphyry displays high SiO2 (68.78%–69.75%) and K2O (3.40%–3.56%) contents, and relatively lower Cr (2.4×10-6–4.09×10-6), Ni (2.79×10-6–3.58×10-6) contents, and positive εHf(t) values (7.7–12.9) indicating that the mineralization porphyry was derived from the partial melting of juvenile lower crust. The Tuolangla deposit is located in the central part of Zedang terrane. This terrane was once considered an ancient terrane. This terrane is in tectonic contact with Cretaceous ophiolitic rocks to its south and Mesozoic continental margin arc volcanics and intrusions of the Gangdese batholith of the Lhasa terrane to its north. Thus, the authors proposed that the Oligocene porphyry skarn Cu-W-Mo mineralization is probably associated with the Zedang terrane. This finding may clarify why the Oligocene (about 23 Ma) deposits are found only in the Zedang area and why mineralization types of the Oligocene mineralization are considerably different from those of the Miocene (17–14 Ma) mineralization.
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a–Map of regional geology (modified from Yin A and Harrison TM, 2000); b–distribution of ore deposits in the Shannan area, southeastern Gangdese (modified from Chung et al., 2009; Jiang ZQ et al., 2011); c–geologic sketch map of the Tuolangla Cu-W-Mo deposit.
Photographs and micrographs of intrusive rocks in Tuolangla deposit.
Hand specimen of drill-core samples showing different vein types.
Microphotographs of drill-core samples showing the mineralization paragenetic relationship at the Tuolangla deposit.
Zircon U–Pb concordia diagrams ages of intrusive rocks.
Geochemistry plot diagram of granodiorite porphyry.
Primitive mantle normalized multi-element patterns (a) and chondrite-normalized rare earth element (REE) patterns (b) of Tuolangla intrusive rocks.
Molybdenite Re-Os age of the Tuolangla deposit (a) and Re content of porphyry deposits in Gangdese belt (b).
Plumbotectonic diagrams of the ore sulphides in the Tuolangla deposit (after Stacey JS and Kramers JD, 1975; Zartman RE and Doe BR, 1981). Data of Nuri and Chenba from Wang LQ et al. (2014). Lhasa block and Gangdese batholith data from Gariépy C et al. (1985) and are also plotted in the diagram for comparison.
Frequency distribution diagram of δ34S values.
Result of zircon Hf isotope concentrations for granodiorite porphyry from Tuolangla. Published zircon Hf isotope data also plotted on the diagram for reference.
Cartoon model for Oligocene evolution of southern Tibet. Part melting of juvenile lower curst involved of ancient materials (about 23 Ma).