Lithospheric structure in the Cathaysia block (South China) and its implication for the Late Mesozoic magmatism

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.

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Supplemental Material: Late Neoproterozoic–early Paleozoic basin evolution in the Cathaysia Block, South China: Implications of spatio-temporal provenance changes on the paleogeographic reconstructions in supercontinent cycles

10.1130/gsab.s.12613640 ◽

2020 ◽

Author(s):

Er-Kun Xue ◽

Wei Wang, ◽

et al.

Keyword(s):

South China ◽

Basin Evolution ◽

Early Paleozoic ◽

Cathaysia Block ◽

Spatio Temporal ◽

Late Neoproterozoic

Supplemental Materials, including Table S1–S7, exhibit data obtained in this study and collected from previously published work.

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Supplemental Material: Identification of ca. 520 Ma mid-ocean-ridge–type ophiolite suite in the inner Cathaysia block, South China: Evidence from shearing-type oceanic plagiogranite

10.1130/gsab.s.16548087 ◽

2021 ◽

Author(s):

Longming Li

Keyword(s):

South China ◽

Nd Isotope ◽

Icp Ms ◽

Mid Ocean Ridge ◽

Ophiolite Suite ◽

Cathaysia Block ◽

Ocean Ridge ◽

Oceanic Plagiogranite ◽

Felsic Rocks ◽

Os Isotope

Table S1: Zircon SIMS U-Pb data and d18O values for the meta-felsic rocks from Shitun area, Cathaysia block, South China; Table S2: LA-ICP-MS analysis of trace elements in zircon from the meta-felsic rocks, Shitun area, Cathaysia block, South China; Table S3: Zircon Hf isotope compositions of the meta-felsic rocks from Shitun area, Cathaysia block, South China; Table S4: Major- and trace-element compositions of the serpentinites, meta-ultramafic rocks, and meta-felsic rocks from Shitun area, Cathaysia block, South China; Table S5: Whole-rock Re-Os isotope compositions of the serpentinites from Shitun area, Cathaysia block, South China; and Table S6: Sr-Nd isotope compositions of the meta-ultramafic and meta-felsic rocks from Shitun area, Cathaysia block, South China.

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