Hydraulic Fracturing Leads to Wolframite Deposition at Magmatic‐hydrothermal transition
Hydraulic Fracturing Leads to Wolframite Deposition at Magmatic‐hydrothermal transition
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DOI：
10.1111/1755-6724.13562
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发表时间：
2018-04
期刊：
影响因子：
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通讯作者：
Xiangchong Liu;H. Xing;Dehui Zhang
中科院分区：
文献类型：
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作者：
Xiangchong Liu;H. Xing;Dehui Zhang
中国南部的南岭是世界级的钨大省。黑钨矿作为本区钨矿床的主要矿石矿物，是如何沉淀成矿的，一直存在争议。黑钨矿的溶解度仅微弱地依赖于压力(Wood和Samson，2000)。因此，压力变化不能改变黑钨矿的溶解度。然而，流体包裹体记录了触发这些矿床中含脉裂缝的启动和扩展的高压流体。水力压裂后流体压力的降低是否会导致黑钨矿从热液中析出，这是一个谜。我们首先通过基于有限元的数值实验证明，水力压裂后的流体压降可以显著降低CO2的溶解度，提高pH，并促进岩浆-热液转变过程中黑钨矿的析出。
The Nanling Range in southern China is a world-class tungsten province. It is disputed how wolframite as the main ore mineral in the tungsten deposits in this area is precipitated. Wolframite solubility is only weakly dependent on pressure (Wood and Samson, 2000). Therefore, a pressure change cannot alter wolframite solubility. However, fluid inclusions record high-pressure fluids that trigger the initiation and propagation of veinbearing fractures in these deposits. It is enigmatic whether a decrease in fluid pressure after hydraulic fracturing causes wolframite precipitation from hydrothermal solutions. We first demonstrate that fluid pressure drop after hydraulic fracturing could cause a significant decrease in CO2 solubility, increase pH, and facilitate wolframite precipitation at magmatic-hydrothermal transition using finite element-based numerical experiments.