Metal source and wolframite precipitation process at the Xihuashan tungsten deposit, South China: Insights from mineralogy, fluid inclusion and stable isotope
Metal source and wolframite precipitation process at the Xihuashan tungsten deposit, South China: Insights from mineralogy, fluid inclusion and stable isotope
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华南西华山钨矿床金属来源和黑钨矿沉淀过程：矿物学、流体包裹体和稳定同位素的见解
DOI：
10.1016/j.oregeorev.2019.102965
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发表时间：
2019-06
影响因子：
3.3
通讯作者：
Leng Cheng Biao
中科院分区：
文献类型：
--
作者：
Yang Jie Hua;Zhanga Zhi;Peng Jian Tang;Liu Liang;Leng Cheng Biao
西华山钨矿赋存于南岭山脉晚侏罗世花岗质岩体中，WO3总资源量约8.13万吨，平均矿石品位为1.08%。主要成矿阶段以黑钨矿为主，与石英共生。黑钨矿成矿流体的δD值为- 82‰~ - 64‰，δ18O值为7.4‰~ 8.8‰。石英中的岩浆流体δD值（−72‰~−58‰）和δ18O值（6.8‰~ 8.0‰）相似，表明岩浆流体同时被石英和黑钨矿捕获。单个包裹体的LA-ICP-MS分析表明，矿化流体中Li、Rb、Cs、K、Na、Ti、Cu、Zn、As和W的含量可测（1 ~ 125 ppm，平均19 ppm），而Fe和Mn的含量则缺失。西华山钨矿黑钨矿中FeO（10.9 ~ 17.7 wt%）和MnO（5.9 ~ 12.7 wt%）含量较高，Fe/（Fe + Mn）原子比为0.46 ~ 0.75，需要外部Fe和Mn的可用性。结果表明，灰岩云母的铁、锰含量明显低于花岗岩原生云母。在灰岩中发现了一些岩浆云母，它们受到热液蚀变的影响。与地核相比，这些云母的边缘缺乏铁、锰、铁和钠。菱铁矿和辉闪石沿蚀变岩浆云母解理面形成，这是花岗岩蚀变过程中铁、锰释放所致。因此，我们定量地证明了西华山岩浆流体提供了W溶液，而花岗岩蚀变则提供了Fe和Mn沉淀黑钨矿。黑钨矿的微量元素和稀土元素特征与花岗岩相似，部分特征与灰岩相似。因此，成矿流体中既有来自最后高度演化的残余花岗岩熔体的成分，也有通过含矿花岗岩蚀变释放的成分。流体-岩石相互作用对黑钨矿的沉淀起主要控制作用。基于矿物学、流体包裹体和稳定同位素，提出了钨矿化与花岗岩成因联系的三阶段过程。
The Xihuashan tungsten deposit, hosted in the late Jurassic granitic pluton in the Nanling Range of South China, has a total resource of about 81,300 tonnes of WO3with an average ore grade of 1.08% WO3. Wolframite is the dominant ore mineral and intergrown with quartz in the main mineralization stage. Ore-forming fluids trapped in wolframite have δD and δ18O values from −82‰ to −64‰ and 7.4‰ to 8.8‰, respectively. Those in quartz have similar δD (−72‰ to −58‰) and δ18O (6.8‰ to 8.0‰) values, indicative of a magmatic fluids simultaneously trapped by quartz and wolframite. LA-ICP-MS analyses for individual fluid inclusion show that this mineralizing fluid contains measurable Li, Rb, Cs, K, Na, Ti, Cu, Zn, As and W (1–125 ppm with average of 19 ppm) while depleted in Fe and Mn. The wolframite from the Xihuashan tungsten deposit contains high FeO (10.9–17.7 wt%) and MnO (5.9–12.7 wt%) contents with Fe/(Fe + Mn) atomic ratio of 0.46 to 0.75, thus requires the availability of external Fe and Mn. We detect that the Fe and Mn contents in mica from the greisen are remarkably lower than primary mica from granite. Some magmatic micas were observed in greisen and were subjected to hydrothermal alteration. Compared to the core, the rim of these micas depleted in Fe, Mn, F, and Na. The siderite and pyrophanite are formed along cleavage planes of altered magmatic mica that are evidence to be due to Fe and Mn release during granite alteration. Thus, we demonstrate quantitatively that magmatic fluids at Xihuashan provide W in solution, whereas the hosted granite alteration contributes Fe and Mn to precipitate wolframite. It is also supported by wolframites have trace and rare earth elements characteristics similar to those of granite and some characteristics similar to the greisen. Therefore, the ore-forming fluids has components derived from the last highly evolved residual granitic melt and components acquired by releasing through the hosted granite alteration. Fluid-rock interaction exert a principle control on wolframite precipitation. Based on mineralogy, fluid inclusion and stable isotope, we proposed three-stage process to illustrate the genetic link between tungsten mineralization and granite.
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影响因子：
3.5
作者：
Wei-dong Sun;Xiaoyong Yang;W. Fan;Fu-Yuan Wu
通讯作者：
Wei-dong Sun;Xiaoyong Yang;W. Fan;Fu-Yuan Wu
影响因子：
4.8
作者：
Wen-Feng Wei;R. Hu;X. Bi;Jian‐tang Peng;W. Su;Shengqiong Song;Shaohua Shi
通讯作者：
Wen-Feng Wei;R. Hu;X. Bi;Jian‐tang Peng;W. Su;Shengqiong Song;Shaohua Shi
影响因子：
5.8
作者：
Shunda Yuan;A. Williams-Jones;J. Mao;Pan Zhao;Chen Yan;Dongliang Zhang
通讯作者：
Shunda Yuan;A. Williams-Jones;J. Mao;Pan Zhao;Chen Yan;Dongliang Zhang
影响因子：
1.7
作者：
Matthieu Harlaux;J. Mercadier;W. Bonzi;Valentin Kremer;C. Marignac;M. Cuney
通讯作者：
Matthieu Harlaux;J. Mercadier;W. Bonzi;Valentin Kremer;C. Marignac;M. Cuney
影响因子：
0.9
作者：
Ru Cheng Wang;F. Fontan;Xiaoming Chen;Huan Hu;C. Liu;Shijin Xu;P. Parseval
通讯作者：
Ru Cheng Wang;F. Fontan;Xiaoming Chen;Huan Hu;C. Liu;Shijin Xu;P. Parseval