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首页> 外文期刊>Ore Geology Reviews: Journal for Comprehensive Studies of Ore Genesis and Ore Exploration >Magmatic evolution and W-Sn-U-Nb-Ta mineralization of the Mesozoic Jiulongnao granitic complex, Nanling Range, South China
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Magmatic evolution and W-Sn-U-Nb-Ta mineralization of the Mesozoic Jiulongnao granitic complex, Nanling Range, South China

机译：中生代九龙环田花岗岩复合物，南陵山脉岩土展，南岭山地展示和W-SN-U-NB-TA矿化

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South China is famous for its large-scale mineralization genetically related to widespread Mesozoic granites. The Jiulongnao complex is one of the largest intrusions in southern Jiangxi Province, and is closely associated with W-dominated polymetallic mineralization. The complex comprises four intrusive phases (I-IV). Phase I consists of medium- to coarse-grained, biotite granite, whereas medium- to coarse-grained, porphyritic, biotite granite and muscovite-bearing granite comprise Phase II. Phase III is composed of medium- to fine-grained, porphyritic, biotite granite and Phase IV consists of medium- to fine-grained, garnet- and biotite-bearing granite. These intrusive phases have LA-ICP-MS zircon U-Pb ages of 160.9 +/- 0.6 Ma, 158.6 +/- 0.7 Ma, 157.0 +/- 1.5 Ma and 154.1 +/- 1.2 Ma, respectively. All of the granites are enriched in Rb, Th, U, Ta and Pb, and significantly depleted in Eu, Ba, Nb, Sr, P and Ti. They have epsilon(Hf)(t) and epsilon(Nd)(t) values ranging from -17.9 to -8.2, and -10.7 to -9.8, respectively, with two-stage Hf model ages of 1.7-2.3 Ga. They are S-type granites derived by partial melting of Paleo-Proterozoic metasedimentary rocks. The four phases have T-zr of 746-760 degrees C, 712-802 degrees C, 798-810 degrees C, and 648-731 degrees C, respectively. Oxygen fugacities of Phases I to III display a decreasing trend but Phase IV has much higher oxygen fugacity in its early stage, which decreased in the late stage. The four phases have different accessory mineral assemblages: Phase I is characterized by an assemblage of zircon, apatite, fergusonite, thorite and uraninite, whereas Phase II is rich in thorite, uraninite, REE-bearing minerals (e.g., monazite, fergusonite and xenotime) and fluorite. Monazite is the main accessory mineral in Phase III, whereas Phase IV contains a wide range of minerals, including thorite, uraninite, Nb-Ta-bearing minerals (e.g., fergusonite and pyrochlore), cassiterite and rutile. These mineral assemblages, together with other geological and geochemical features, suggest that W mineralization was genetically related to Phases I, II and IV, whereas U mineralization was most extensive in Phase II. Sn, Nb and Ta mineralization was associated with the highly fractionated of magmas of Phase IV.
机译：南方以其与广泛的中生代花岗岩的大规模矿化而闻名。九龙环综合体是江西南部最大的入侵之一，与W标准的多金属矿化密切相关。该复合物包含四个侵入式阶段（I-IV）。 I阶段由较粗粒，生物壳花岗岩，而中粗颗粒，卟啉，生物烟石花岗岩和亚霉菌花岗岩包括II期。 III期由培养基至细粒度，卟啉，生物烟石花岗岩和相位IV组成，包括介质至细粒度，石榴石和生物菌座花岗岩。这些侵入式阶段具有160.9 +/- 0.6 mA，158.6 +/- 0.7 mA，157.0 +/- 1.5 mA和154.1 +/- 1.2 mA的LA-ICP-MS ZIRCON U-PB。所有花岗岩富含RB，Th，U，Ta和Pb，在Eu，Ba，Nb，Sr，P和Ti中显着耗尽。它们具有从-17.9至-8.2，分别为-17.9至-8.2的epsilon（hf）（t）和ε（nd）值，分别具有2阶段的HF模型年龄1.7-2.3a Ga。它们是S型花岗岩通过古端思想元岩部分熔化而得出。四相具有746-760℃，712-802℃，798-810℃和648-731摄氏度的T-Zr。阶段I至III阶段的氧气球场显示出降低趋势，但第IV期在其早期阶段具有更高的氧气功能性，在晚期下降。四个阶段具有不同的辅助矿物组合物：I阶段的特征在于锆石，磷灰石，弗格兰骨，钍系和铀矿的组合，而第II期富含钍，铀酸盐，戒华矿物质（例如，Monazite，Fergusonite和Xenotime）和萤石。 Monazite是III期的主要辅助矿物质，而第四阶段含有各种矿物质，包括钍，铀酸盐，Nb-TA矿物（例如，Fergusonite和Pyrochlore），卡斯蒂塔和金属丝石。这些矿物组合，以及其他地质和地球化学特征，表明W矿化与I，II和IV相遗传相关，而U矿化在II期最广泛。 Sn，Nb和Ta矿化与IV期岩浆的高度分馏有关。

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