Auriferous Quartz Veining Due to CO2 Content Variations and Decompressional Cooling, Revealed by Quartz Solubility, SEM-CL and Fluid Inclusion Analyses (The Linglong Goldfield, Jiaodong)
Auriferous Quartz Veining Due to CO2 Content Variations and Decompressional Cooling, Revealed by Quartz Solubility, SEM-CL and Fluid Inclusion Analyses (The Linglong Goldfield, Jiaodong)
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通过石英溶解度、SEM-CL 和流体包裹体分析揭示 CO2 含量变化和减压冷却导致的含金石英脉（胶东玲珑金矿）
DOI：
10.3390/min10050417
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发表时间：
2020-05
期刊：
影响因子：
2.5
通讯作者：
Xuan Liu
中科院分区：
文献类型：
--
作者：
Qing Wei;Hongrui Fan;Jacques Pironon;Xuan Liu
石英是热液脉中最常见的脉石矿物。再加上其容纳流体包裹体和记录各种显微结构的能力，它的溶解度行为可能提供无与伦比的洞察热液过程。本研究以胶东玲珑戈德菲尔德为研究对象，对石英脉成矿过程进行了研究。扫描电子显微镜（SEM）-阴极发光（CL）成像发现了三个事件的石英沉积，干预的一个事件的石英溶解。根据新近发展的石英溶解度图解和CL辅助流体包裹体显微测温，提出最早期石英（Qz 1）的沉淀受CO2含量增加的控制，其次受减压冷却的影响，导致早期厚层贫金矿脉（V1）的形成;第二代石英（Qz 2a）是由同样的流体形成的，可能是被大气降水稀释和冷却的，导致石英的数量大大减少，黄铁矿和金的沉积;第三代石英（Qz 2b）与多金属硫化物一起沿着沉积，这可能是由于退溶区冷却和/或CO2含量降低引起的石英溶解事件之后的流体冷却所致。这项研究可能阐明金的形成过程中造山侵入有关的矿床，并指出，必要的CL为基础的原位分析，为今后的研究。
Quartz is the most common gangue mineral in hydrothermal veins. Coupled with capacities of hosting fluid inclusions and recording varieties of microtextures, its solubility behavior may provide unparalleled insights into hydrothermal processes. In this study, the Linglong goldfield in Jiaodong is targeted to investigate gold-producing quartz veining process. Scanning electron microscope (SEM)-cathodoluminescence (CL) imaging uncovered three episodes of quartz deposition, intervened by an episode of quartz dissolution. Based on newly-developed quartz solubility diagrams and CL-aided fluid inclusion microthermometry, it is proposed that precipitation of the earliest quartz (Qz1) was controlled by CO2 content increase and subordinately affected by decompressional cooling, leading to the formation of the early thick gold-barren veins (V1); the second generation of quartz (Qz2a) was formed by the same fluids that may have been diluted and cooled by meteoric water, leading to a greatly reduced quantity of quartz and the deposition of pyrite and gold; and the third generation of quartz (Qz2b) was deposited along with polymetallic sulfides, due to fluid cooling following a quartz dissolution event likely induced by cooling in retrograde solubility region and/or CO2 content decrease. This research may elucidate gold formation processes in orogenic intrusion—related deposits, and points to imperative CL-based in situ analyses for future studies.
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影响因子：
5.8
作者：
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通讯作者：
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影响因子：
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作者：
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