Abstract
Abundant Jurassic-Cretaceous W-Sn ore deposits are distributed in the Nanling Range in South China. However, the exact mineralization ages, relationships between mineralization and granitic rocks, and tectonic settings of these deposits remain controversial. As a giant quartz vein-type W-Sn deposit hosted in Devonian sedimentary strata, the Shanhu orebodies are featured by located about 4 km far away from the Yantianling muscovite granite. Zircon U-Pb dating of the Yantianling granite yielded ages of 101.0 ± 1.5 Ma and 100.4 ± 1.1 Ma, consistent with cassiterite U-Pb ages of quartz vein ores (100.2 ± 1.0 Ma and 100.5 ± 1.1 Ma), indicating a close genetic relationship between the granitic magmatism and quartz vein-type W-Sn mineralization. The Yantianling muscovite granite is characterized by highly silicious (72.01–74.62 wt%), high alkali (Na2O + K2O = 5.32–7.89 wt%) and strongly peraluminous (A/CNK = 1.11–1.81). The granite is enriched in Rb, Ta, Nd and U, and depleted in Sr, Ti and P. It displays right-declining chondrite-normalized REE patterns with strongly negative Eu anomalies, and has low Nb/Ta and Zr/Hf ratios, indicating that the granite experienced strong magmatic differentiation. The Yantianling granite has low whole-rock εNd(t) values (−9.5 to −9.3), zircon εHf(t) values (−12.7 to −7.8) and Paleoproterozoic model ages. The granite belongs to S-type and was derived from partial melting of meta-sedimentary crust. The low Ce4+/Ce3+ ratios (averaging 47) of zircon from the Yantianling granite indicated low oxygen fugacity, similar to other W-bearing granites in South China. This study indicated that Cretaceous granitic magmatism in the Nanling Range also has strong W-Sn mineralization potential. Combined with previous studies on coeval magmatic rocks and tectonic activities, we propose that the Yantianling S-type granite and associated W-Sn mineralization in the Nanling Range were formed during the regional lithospheric extensional environment.
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