Piaoac Granites Related W-Sn Mineralization, Northern Vietnam: Evidences from Geochemistry, Zircon Geochronology and Hf Isotopes
Piaoac Granites Related W-Sn Mineralization, Northern Vietnam: Evidences from Geochemistry, Zircon Geochronology and Hf Isotopes
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越南北部 Piaoac 花岗岩相关 W-Sn 矿化：来自地球化学、锆石地质年代学和 Hf 同位素的证据
DOI：
10.1007/s12583-018-0865-6
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发表时间：
2019-02
影响因子：
3.3
通讯作者：
Lee Insung
中科院分区：
文献类型：
--
作者：
Tuan Anh Nguyen;Yang Xiaoyong;Hien Vu Thi;Liu Lei;Lee Insung
越南北方曹邦地区出露的Piaoac花岗岩为S型花岗岩，与W-Sn-Mo-Be-F矿化有关。本文详细地研究了皮亚奥阿克地区含钨锡花岗岩的锆石U-Pb年龄、主量元素和微量元素、矿物化学和Hf同位素组成。锆石LA-ICP-MS U-Pb年龄分别为82.5± 2.3Ma和82± 1.8Ma，代表晚白垩世岩浆事件。这些花岗岩的特征是高过铝质，并具有典型的S型地球化学特征，具有高SiO2（72.37 wt.%- 73.07重量%），高A/CNK值（1.61-1.65）和1.12 - 1.33（14.4wt%-1.5wt%）15重量%）。富Rb、U、K、Th、Ta、Pb，具有明显的Ba、Sr、Nb、Ti、Eu负异常（Eu/Eu*=0.19-0.24）。高结晶度的特征在于低的Rb、Sr、Ba和Eu浓度以及高的La/Sm和Eu/Eu* 比。锆石的εHf（t）值为-9.69 ~-0.9，对应的TDm 2值为1.2 ~ 1.7Ga，表明这些花岗岩可能来源于元古宙基底岩石，少量幔源岩浆的侵入。黑云母中Fe ~（3+）、Fe ~（2+）的计算结果表明，该矿床处于低氧逸度条件下（10 ~（-17）~ 10 ~（-18）bar，低于MH），有利于钨锡成矿。钨和锡在花岗质岩浆中通过分馏作用富集，低氧逸度条件促进了热液中钨锡的富集和迁移，导致矿物相的沉积。地球化学资料表明，赣中花岗岩形成于与晚白垩世华南陆块岩石圈大规模拉张作用有关的拉张环境。
Piaoac granites exposed in the Cao Bang region, northern Vietnam, are S-type granite, which are associated with W-Sn-Mo-Be-F mineralization. Zircon U-Pb ages, major and trace elements, mineral chemical and Hf isotopic compositions of the W-Sn-bearing granites from the Piaoac District have been investigated in detail. LA-ICP-MS U-Pb dating of zircon grains from these granites yielded ages of 82.5±2.3 and 82±1.8 Ma, representing an episode of Late Cretaceous magmatic event. These granites are characterized by high peraluminous and have typical S-type geochemical signatures with high SiO2(72.37 wt.%-73.07 wt.%), high A/CNK values (1.61-1.65) and Аl2О3(14.4 wt.%-15 wt.%). They are enriched in Rb, U, K, Th, Ta and Pb and display pronounced negative Ba, Sr, Nb, Ti and Eu (Eu/Eu*=0.19-0.24) anomalies. The high degree of fractional crystallization is characterized by low Rb, Sr, Ba and Eu concentrations with high ratios of La/Sm and Eu/Eu*. Zircon grains showεHf(t) values from -9.69 to -0.9 and the correspondingTDm2range from 1.2 to 1.7 Ga, indicating that these granites could be derived from the Proterozoic basement rocks with minor input from mantle-derived magmas. The calculation of Fe3+and Fe2+of biotites indicates a low oxygen fugacity condition (logranging from 10-17to 10-18bars, below MH), which is favorable for the W-Sn mineralization. Tungsten and tin have been enriched in granitic magmas through fractionation, and low oxygen fugacity conditions have promoted the accumulation and transportation of W-Sn in the hydrothermal fluids, leading to deposition of mineral phases. The geochemical data suggest that Piaoac granites formed in an extensional setting related with the Late Cretaceous magmatism occurring large-scale lithospheric extensional in South China Block.
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影响因子：
1.8
作者：
Y. Liu;Zheng‐Xiang Li;H. Li;L. Guo;W. Xu;L. Ye;C. Li;D. Pi
通讯作者：
Y. Liu;Zheng‐Xiang Li;H. Li;L. Guo;W. Xu;L. Ye;C. Li;D. Pi
影响因子：
5
作者：
J. A. Philpotts;C. Schnetzler
通讯作者：
J. A. Philpotts;C. Schnetzler
DOI：
10.2113/0120061
发表时间：
2003
期刊：
Exploration and Mining Geology
影响因子：
--
作者：
J. Richards;T. Dang;S. Dudka;Marke Wong
通讯作者：
J. Richards;T. Dang;S. Dudka;Marke Wong
DOI：
10.1016/0743-9547(93)90039-r
发表时间：
1993
期刊：
Journal of Southeast Asian Earth Sciences
影响因子：
--
作者：
Trinh Xuan Ben;Nguyen Van Hoai;Yu.E. Visnepskaya
通讯作者：
Trinh Xuan Ben;Nguyen Van Hoai;Yu.E. Visnepskaya
影响因子：
3
作者：
F. Roger;H. Maluski;C. Lepvrier;Tich Vu Van;J. Paquette
通讯作者：
F. Roger;H. Maluski;C. Lepvrier;Tich Vu Van;J. Paquette