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Neoproterozoic tungsten mineralization: Geology, chronology, and genesis of the Huashandong W deposit in northwestern Jiangxi, South China
Mineralium Deposita ( IF 4.4 ) Pub Date : 2022-12-22 , DOI: 10.1007/s00126-022-01157-5
Xu-Dong Huang , Di Huang , Jian-Jun Lu , Rong-Qing Zhang , Dong-Sheng Ma , Yao-Hui Jiang , Hao-Wen Chen , Jin-Xian Liu

The Huashandong W deposit (7.7 Mt @ 0.26% WO3) is a newly discovered Neoproterozoic scheelite-dominated deposit in the world-class Jiangnan tungsten belt, South China. It occurs largely in metasedimentary rocks near the western margin of the Neoproterozoic Jiuling batholith and mainly consists of W-bearing exogreisen, hydrothermal breccias, and quartz veins. Two episodes of Neoproterozoic granite magmatism are identified with zircon U-Pb ages of ca. 830–823 and 807–804 Ma, respectively. According to cross-cutting relationships and mineral assemblages, two periods of hydrothermal alteration and W mineralization, corresponding to the two episodes of granite magmatism, are recognized in the Huashandong deposit. The early period is dominated by greisenization and associated scheelite mineralization whereas the late period is characterized by sericitization, hydrothermal brecciation, quartz veining, and associated scheelite and minor wolframite mineralization. Molybdenite Re-Os dating indicates that the early- and late-period W mineralization took place at ca. 828 and 800 Ma, respectively. Zircon trace element characteristics suggest that the Jiuling granite crystallized from reduced granitic magmas and has the potential for W mineralization. The petrologic and geochemical features of the Jiuling granite, coupled with the zircon U-Pb ages and Hf isotopic signatures and molybdenite Re-Os ages, imply that the Huashandong W deposit is genetically related to two phases of evolved granodiorites in the Jiuling batholith. The magmatic-hydrothermal nature of both metallogenic events is confirmed by H-O isotopes on hydrothermal quartz.



中文翻译:

新元古代钨矿化:江西西北部华山东钨矿床的地质学、年代学和成因

华山东 W 矿床 (7.7 Mt @ 0.26% WO 3)是华南世界级江南钨带新发现的新元古代白钨矿床。主要产于新元古代九岭岩基西缘附近的变质沉积岩中,主要由含钨外长灰岩、热液角砾岩和石英脉组成。新元古代花岗岩岩浆作用的两个事件被确定为 ca 的锆石 U-Pb 年龄。分别为 830–823 和 807–804 Ma。根据横切关系和矿物组合,华山东矿床可识别出与两次花岗岩岩浆作用相对应的两期热液蚀变和钨矿化。早期以云英岩化和伴生白钨矿化为主,晚期以绢云母化、热液角砾化、石英脉,以及相关的白钨矿和次要黑钨矿化。辉钼矿 Re-Os 测年表明早期和晚期 W 矿化发生在大约 分别为 828 和 800 Ma。锆石微量元素特征表明,九岭花岗岩由还原的花岗岩岩浆结晶而成,具有W矿化潜力。九岭花岗岩的岩石学和地球化学特征,加上锆石 U-Pb 年龄和 Hf 同位素特征以及辉钼矿 Re-Os 年龄,表明华山东 W 矿床与九岭岩基中演化的两期花岗闪长岩在成因上有关。热液石英上的 H2O 同位素证实了这两种成矿事件的岩浆-热液性质。辉钼矿 Re-Os 测年表明早期和晚期 W 矿化发生在大约 分别为 828 和 800 Ma。锆石微量元素特征表明,九岭花岗岩由还原的花岗岩岩浆结晶而成,具有W矿化潜力。九岭花岗岩的岩石学和地球化学特征,加上锆石 U-Pb 年龄和 Hf 同位素特征以及辉钼矿 Re-Os 年龄,表明华山东 W 矿床与九岭岩基中演化的两期花岗闪长岩在成因上有关。热液石英上的 H2O 同位素证实了这两种成矿事件的岩浆-热液性质。辉钼矿 Re-Os 测年表明早期和晚期 W 矿化发生在大约 分别为 828 和 800 Ma。锆石微量元素特征表明,九岭花岗岩由还原的花岗岩岩浆结晶而成,具有W矿化潜力。九岭花岗岩的岩石学和地球化学特征,加上锆石 U-Pb 年龄和 Hf 同位素特征以及辉钼矿 Re-Os 年龄,表明华山东 W 矿床与九岭岩基中演化的两期花岗闪长岩在成因上有关。热液石英上的 H2O 同位素证实了这两种成矿事件的岩浆-热液性质。锆石微量元素特征表明,九岭花岗岩由还原的花岗岩岩浆结晶而成,具有W矿化潜力。九岭花岗岩的岩石学和地球化学特征,加上锆石 U-Pb 年龄和 Hf 同位素特征以及辉钼矿 Re-Os 年龄,表明华山东 W 矿床与九岭岩基中演化的两期花岗闪长岩在成因上有关。热液石英上的 H2O 同位素证实了这两种成矿事件的岩浆-热液性质。锆石微量元素特征表明,九岭花岗岩由还原的花岗岩岩浆结晶而成,具有W矿化潜力。九岭花岗岩的岩石学和地球化学特征,加上锆石 U-Pb 年龄和 Hf 同位素特征以及辉钼矿 Re-Os 年龄,表明华山东 W 矿床与九岭岩基中演化的两期花岗闪长岩在成因上有关。热液石英上的 H2O 同位素证实了这两种成矿事件的岩浆-热液性质。暗示华山东W矿床与九岭岩基中两期演化的花岗闪长岩存在成因关系。热液石英上的 H2O 同位素证实了这两种成矿事件的岩浆-热液性质。暗示华山东W矿床与九岭岩基中两期演化的花岗闪长岩存在成因关系。热液石英上的 H2O 同位素证实了这两种成矿事件的岩浆-热液性质。

更新日期:2022-12-24
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