Geochemical characteristics of gold mineralization of the Huai Kham On deposit, Sukhothai Fold Belt, Northern Thailand
Geochemical characteristics of gold mineralization of the Huai Kham On deposit, Sukhothai Fold Belt, Northern Thailand
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泰国北部素可泰褶皱带Huai Kham On矿床金矿化地球化学特征
DOI：
10.1111/rge.12246
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发表时间：
2020
期刊：
影响因子：
1.4
通讯作者：
Punya Charusiri
中科院分区：
文献类型：
--
作者：
Ladda Tangwattananukul;Daizo Ishiyama;Punya Charusiri
Huai Kham On金矿存款位于泰国北方素可泰褶皱带的中部。素可泰褶皱带是由印支地体和锡布马苏地体俯冲碰撞形成的增生杂岩。素可泰褶皱带内有许多小型金矿床，但其矿床类型和形成环境尚不清楚。Huai Kham On存款的地质由石炭纪至三叠纪的火山岩和火山沉积岩、石灰岩和低级变质岩组成。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、自然金、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、自然金和黄铜矿组成。第IV阶段的矿脉由方解石、白云石、方解石和石英组成。石英脉中的流体包裹体分为富液两相（IA和IB型）、碳水（II型）和碳（III型）流体包裹体。与I ~ III期含金石英脉有关的IA型和II型流体包裹体均一温度为240° ~ 280°C。第一至第三阶段石英脉的δ 18 O值范围为+12.9至+13.4‰，表明存在均匀的热液，没有温度变化，例如在怀康安金存款第一至第三阶段含金石英脉形成期间温度降低。根据280°C的形成温度计算，形成含金石英脉的热液δ 18 O值为+3.2 ‰ ~+3.7‰，福尔斯属于变质沃茨。怀康昂存款矿床的含金石英脉被解释为变质水的产物。
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 IAand IB), carbonic‐aqueous (Type II), and carbonic (Type III) fluid inclusions. The homogenization temperatures of Types IAand 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.