Geochemical characteristics of gold mineralization of the Huai Kham On deposit, Sukhothai Fold Belt, Northern Thailand

IF 1.1 4区 地球科学 Q3 GEOLOGY Resource Geology Pub Date : 2020-09-29 DOI:10.1111/rge.12246
L. Tangwattananukul, D. Ishiyama, P. Charusiri
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引用次数: 1

Abstract

The Huai Kham On gold deposit is located in the central part of the Sukhothai Fold Belt, northern Thailand. The Sukhothai Fold Belt represents an accretionary complex formed by subduction and collision between the Indochina and Sibumasu Terranes. There are many small gold deposits in the Sukhothai Fold Belt; however, the styles and formation environments of those gold deposits are not clear. The geology of the Huai Kham On deposit consists of volcanic and volcanosedimentary rocks, limestone, and low‐grade metamorphic rocks of Carboniferous to Triassic age. Gold‐bearing quartz veins are hosted by volcanic and volcanosedimentary rocks. The quartz veins can be divided into four stages. The mineral assemblage of the gold‐bearing quartz veins of Stages I and II comprises quartz, calcite, illite, pyrite, native gold, galena, chalcopyrite, and sphalerite. Quartz veins of Stage III consist of microcrystalline quartz, dolomite, calcite, pyrite, native gold, and chalcopyrite. Veins of Stage IV consist of calcite, dolomite, chlorite, and quartz. Fluid inclusions in quartz veins are classified into liquid‐rich two‐phase (Types IA and IB), carbonic‐aqueous (Type II), and carbonic (Type III) fluid inclusions. The homogenization temperatures of Types IA and II fluid inclusions that are related to the gold‐bearing quartz veins from Stages I to III ranged from 240° to 280°C. The δ18O values of quartz veins of Stages I to III range from +12.9 to +13.4‰, suggesting the presence of a homogeneous hydrothermal solution without temperature variation such as a decrease of temperature during the formation of gold‐bearing quartz veins from Stages I to III in the Huai Kham On gold deposit. Based on the calculated formation temperature of 280°C, the δ18O values of the hydrothermal solution that formed the gold‐bearing quartz veins range from +3.2 to +3.7‰, which falls into the range of metamorphic waters. The gold‐bearing quartz veins of the Huai Kham On deposit are interpreted to be the products of metamorphic water.
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泰国北部素可泰褶皱带淮坎安金矿化地球化学特征
淮康安金矿位于泰国北部素可泰褶皱带的中部。素可泰褶皱带有许多小型金矿床;然而,这些金矿床的样式和形成环境尚不清楚。淮康安矿床地质主要由石炭-三叠纪火山岩、火山沉积岩、灰岩和低品位变质岩组成。含金石英脉赋存于火山岩和火山沉积岩中。石英脉可分为四个阶段。第一阶段和第二阶段含金石英脉的矿物组合包括石英、方解石、伊利石、黄铁矿、原生金、方铅矿、黄铜矿和闪锌矿。第三阶段石英脉由微晶石英、白云石、方解石、黄铁矿、原生金和黄铜矿组成。第四阶段的矿脉由方解石、白云石、绿泥石和石英组成。石英脉中的流体包裹体分为富液两相(IA型和IB型)、碳水(II型)和碳水(III型)流体包裹体。ⅰ~ⅲ期与含金石英脉相关的IA型和II型流体包裹体均一温度范围为240 ~ 280℃。ⅰ~ⅲ期石英脉的δ18O值在+12.9 ~ +13.4‰之间,表明淮康安金矿ⅰ~ⅲ期含金石英脉形成过程中存在均匀热液,没有温度降低等温度变化。根据280℃的地层温度计算,形成含金石英脉的热液的δ18O值为+3.2 ~ +3.7‰,属于变质水的范畴。淮康安金矿床含金石英脉被解释为变质水的产物。
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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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