海南宝伦金矿床成因地质与包裹体研究

IF 1.1 4区 地球科学 Q3 GEOLOGY
Resource Geology Pub Date : 2020-07-16 DOI:10.1111/rge.12243
Liangliang Yu, Deru Xu, Weixin Chen, Boyou Zhang, L. Tian, Q. Shan
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引用次数: 1

摘要

晚三叠世宝伦金矿床为志留系千层岩赋存物,是海南岛的一个大型高品位金矿床。矿石可分为石英脉为主型和少蚀变岩型。根据矿物组合划分出3个成矿阶段。早期是最重要的成矿阶段,以石英-原生金组合为特征。白云母-石英-黄铁矿-金矿组合与中成矿阶段有关。在成矿晚期,原生金矿物与含铋矿物为共生矿物。显微测温分析表明,成矿早期主要有两类流体包裹体,即富CO2包裹体(C型)和含水包裹体(W型)。C型包裹体在276-335℃均匀化,平均值为306℃,盐度为1.0-10.0 wt% NaCl当量(平均值为4.9 wt% NaCl当量)。W型包裹体在252-301°C(平均值278°C)下均匀化,盐度为4.0-9.7 wt% NaCl当量(平均值7.4 wt% NaCl当量)。在中矿化阶段,C型和W型包裹体在228 ~ 320℃(平均值283℃)和174 ~ 296℃(平均值241℃)均匀化,盐度分别为2.4 ~ 9.9 wt% NaCl当量(平均值6.5 wt% NaCl当量)和3.7 ~ 11.7 wt% NaCl当量(平均值7.7 wt% NaCl当量)。未发现石英、方解石等适合成矿晚期流体包裹体研究的矿物。相比之下,仅在矿后无矿脉中发现了含水包裹体,其均质温度较低,范围为168-241°C(平均值为195°C),盐度相似(2.6-12.6 wt% NaCl当量,平均值为7.2 wt% NaCl当量)。各成矿阶段均质温度不同,C型和W型矿化度相近,表明成矿过程中存在流体不混溶和沸腾现象。宝伦金矿床由含CO2的中温流体沉积而成,形成于古特提斯闭合后的同步碰撞环境。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Geology and inclusion studies on the genesis of the Baolun gold deposit in Hainan Province, South China
The late Triassic Baolun gold deposit hosted by Silurian phyllites is a large‐scale high‐grade gold deposit in Hainan Island, South China. The ores can be classified into quartz‐vein dominated type and less altered rock type. Three mineralization stages were recognized by mineral assemblages. The early stage, as the most important mineralization stage, is characterized by a quartz–native gold assemblage. The muscovite−quartz−pyrite−native gold assemblage is related to the intermedium mineralization stage. In late mineralization stage, native gold and Bi‐bearing minerals are paragenetic minerals. Microthermometry analyses show that the early mineralization stage is characterized by two types of fluid inclusions, including CO2‐rich inclusions (C‐type) and aqueous inclusions (W‐type). C‐type inclusions homogenize at 276–335°C with an averaged value of 306°C and have salinities of 1.0–10.0 wt% NaCl equivalent (mean value of 4.9 wt% NaCl equivalent). W‐type inclusions homogenize at 252–301°C (mean value of 278°C) with salinity of 4.0–9.7 wt% NaCl equivalent (mean value of 7.4 wt% NaCl equivalent). In intermedium mineralization stage, C‐type and W‐type inclusions homogenize at 228–320°C (mean value of 283°C) and 178–296°C (mean value of 241°C), with salinities of 2.4–9.9 wt% NaCl equivalent (mean value of 6.5 wt% NaCl equivalent) and 3.7–11.7 wt% NaCl equivalent (mean value of 7.7 wt% NaCl equivalent), respectively. No suitable mineral, such as quartz or calcite, was found for fluid inclusion study from late mineralization stage. In contrast, only aqueous inclusions were found from post‐ore barren veins, which yielded lower homogenization temperatures ranging from 168–241°C (mean value of 195°C) and similar salinities (2.6–12.6 wt% NaCl equivalent with averaged value of 7.2 wt% NaCl equivalent). The different homogenization temperatures and similar salinities of C‐type and W‐type from each mineralization stage indicate that fluid immiscibility and boiling occurred. The Baolun gold deposit was precipitated from a CO2‐bearing mesothermal fluid, and formed at a syn‐collision environment following the closure of the Paleo‐Tethys.
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来源期刊
Resource Geology
Resource Geology 地学-地质学
CiteScore
2.30
自引率
14.30%
发文量
18
审稿时长
12 months
期刊介绍: Resource Geology is an international journal focusing on economic geology, geochemistry and environmental geology. Its purpose is to contribute to the promotion of earth sciences related to metallic and non-metallic mineral deposits mainly in Asia, Oceania and the Circum-Pacific region, although other parts of the world are also considered. Launched in 1998 by the Society for Resource Geology, the journal is published quarterly in English, making it more accessible to the international geological community. The journal publishes high quality papers of interest to those engaged in research and exploration of mineral deposits.
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