Implications of aplite dykes for mineralization in the Late Cretaceous vein-type Xiuwacu W-Mo deposit in the southern Yidun Terrane, SE Tibetan Plateau

Zhang, Xiangfei; Li, Wenchang; Yang, Zhen; Xue, Gang; Zhu, Jun; Liu, Weidong

doi:10.1016/j.jseaes.2020.104555

Cited by 7 publications

(2 citation statements)

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“…In the Early Cretaceous, the Jiaodong Peninsula underwent lithospheric extension and thinning, which led to strong magmatic activity [42]. During the process of granitic magma invading along the structure, the crystallization differentiation of the magmatic system itself probably resulted in the late-stage magmatic hydrothermal fluid being rich in Be-Li-Nb-Ta-Sn-Bi-W-Mo-Cu-Zn-U-Au [25][26][27][28]. With regard to the late stage of granitic magmatic crystallization, the fluid is dominantly sourced from magma degassing and fluid exsolution, which is represented by both high salinity and temperature.…”

Section: Gold Precipitation Mechanismmentioning

confidence: 99%

“…More interestingly, it is noted that the deposit developed in the late Early Cretaceous as fine-grained granite. Fine-grained granite is considered to be the late-stage product of granitic magmatic crystallization and is usually rich in Be-Li-Nb-Ta-Sn-Bi-W-Mo-Cu-Zn-U elements [25][26][27][28], which has resulted in the close spatial and temporal relationship between fine-grained granites and orebodies in many deposits [29], such as the W-Mo deposit [28,30,31], copper deposit [32], uranium deposit [25,33,34], and Pb-Zn deposit [35]. However, little information on the gold mineralization associated with fine-grained granite has been reported to date.…”

Section: Introductionmentioning

confidence: 99%

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Fluid Inclusions and Stable Isotope Geochemistry of Gold Mineralization Associated with Fine-Grained Granite: A Case Study of the Xiawolong Gold Deposit, Jiaodong Peninsula, China

Wang

Ding

et al. 2022

Applied Sciences

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The Xiawolong gold deposit, located in the Muping–Rushan gold metallogenic belt (eastern Jiaodong Peninsula), is a newly discovered deposit that developed in the late Early Cretaceous as fine-grained granite. Gold mineralization, which mainly occurs in the middle of fresh fine-grained granite dikes, consists of stockwork-style and disseminated ores. They are characterized by middle-high-temperature mineral assemblages, such as molybdenite and magnetite, associated with gold-bearing pyrite. Four types of primary fluid inclusions, contained within the quartz grains from the gold-bearing disseminated and stockwork-style fine-grained granitic ores, were identified based on microthermometry and Raman spectroscopy. The types identified were type 1 aqueous inclusions with middle-high temperature (201 to 480 °C) and middle-low salinity of 0.18 to 17.00 wt.% NaCl equiv.; type 2 H2O–CO2 inclusions, which show middle-high temperatures (218 to 385 °C), middle-low salinities (1.23 to 13.26 wt.% equiv. NaCl), and variable XCO2 (0.031 to 0.044); type 3 daughter mineral-bearing inclusions with high temperature (416 to 446 °C) and relatively constant and high salinity (28.59 to 32.87 wt.% NaCl equiv.); and type 4 CO2 fluid inclusions, which possess a bulk density of 0.405 to 0.758 g/cm3 and a constant XCO2 (0.952 to 0.990) (according to the decreasing abundance of fluid inclusions). The δ18Owater range is between 3.4 and 5.9‰, and the range of the δD is from −97.1 to −77.4‰, which indicates that the ore-forming process is of a magmatic water origin. The δ34S values possess a narrow range between 4.5 and 9.3‰, indicating the source of the Mesozoic Kunyushan granitoids. The Pb isotopic compositions of pyrite show that the Mesozoic Kunyushan granitoids are the main lead source for pyrites. Types 1, 2, and 3 fluid inclusions coexist in the same view field of the quartz grain, which are suggested to occur as the result of fluid immiscibility because of the boiling of a single homogeneous NaCl-CaCl2-KCl-CO2-H2O system. The fluid immiscibility, rather the fluid mixing and wall-rock sulfidation, is the mechanism of gold precipitation in the Xiawolong deposit. Compared with both the “Linglong-type” and “Jiaojia-type” gold deposits in the Jiaodong Peninsula in terms of geological–petrographic evidence and all of the available geochemical data, it can be concluded the Xiawolong gold deposit is of magmatic hydrothermal origin, having a genetic relation to the fine-grained granite.

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Section: Gold Precipitation Mechanismmentioning

confidence: 99%