Abstract
Jiangxi Province (South China) is one of the world’s top tungsten (W) mineral provinces. In this paper, we present a new LA-ICP-MS zircon U-Pb age and Hf isotope data on the W ore-related Xianglushan granite in northern Jiangxi Province. The magmatic zircon grains (with high Th/U values) yielded an early Cretaceous weighted mean U-Pb age of 125 ± 1 Ma (MSWD = 2.5, 2σ). Zircon εHf(t) values of the Xianglushan granite are higher (−6.9 to −4.1, avg. −5.4 ± 0.7) than those of the W ore-related Xihuanshan granite in southern Jiangxi Province (−14.9 to −11.2, avg. −12.5 ± 0.9), implying different sources between the W ore-forming magmas in the northern and southern Jiangxi Province. Compiling published zircon geochemical data, the oxygen fugacity (fO2) of the late Yanshanian granitic magmas in Jiangxi Province (the Xianglushan, Ehu, Dahutang, and Xihuashan plutons) were calculated by different interpolation methods. As opposed to the W ore-barren Ehu granitic magma, the low fO2 of the Xianglushan granitic magma may have caused W enrichment and mineralization, whilst high fO2 may have led to the coexistence of Cu and W mineralization in the Dahutang pluton. Additionally, our study suggests that the absence of late Mesozoic Cu-Mo mineralization in the Zhejiang, Jiangxi, and Anhui Provinces (Zhe-Gan-Wan region) was probably related to low fO2 magmatism in the Cretaceous.
Highlights
South China is the main tungsten (W)-producing province in China.The early-discovered W deposits are mainly distributed in southwest Jiangxi Province, such as the renowned Xihuashan, Piaotang, and Dajishan deposits [1,2,3,4,5]
As opposed to the W ore-barren Ehu granitic magma, the low f O2 of the Xianglushan granitic magma may have caused W enrichment and mineralization, whilst high f O2 may have led to the coexistence of Cu and W mineralization in the Dahutang pluton
LA-ICP-MS zircon U-Pb dating of the Xianglushan biotite granite yielded an Early Cretaceous age (125 ± 1 Ma)
Summary
South China (especially Jiangxi Province) is the main tungsten (W)-producing province in China.The early-discovered W deposits are mainly distributed in southwest Jiangxi Province, such as the renowned Xihuashan, Piaotang, and Dajishan deposits [1,2,3,4,5]. Xianglushan deposit was discovered in the 1960s in the northern Jiangxi province, a region better known for its association with world class porphyry copper (Dexing copper deposit (DCP)) and large- to medium-sized polymetallic Cu deposits [6,7,8,9,10,11,12]. The recent discovery of several super-large W deposits, such as the Zhuxi and Dahutang deposits in northern Jiangxi Province, have renewed research interest on the W metallogeny in the region and its relationship with the coeval Cu mineralization. The main W mineralization in both northern and southern Jiangxi Province was related to the Yanshanian (Jurassic-Cretaceous). Zircon U-Pb age and geochemical characteristics of granite porphyry in Zhuxi Tungsten (Copper) Deposit, Jingdezhen, and their relationship with mineralization. Rev. 2014, 60, 693–708, (In Chinese with English Abstract)
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