The Salu Bulo prospect is one of the gold prospects in the Awak Mas project in the central part of the western province, Sulawesi, Indonesia. The gold mineralization is hosted by the meta‐sedimentary rocks intercalated with the meta‐volcanic and volcaniclastic rocks of the Latimojong Metamorphic Complex. The ores are approximately three meters thick, consisting of veins, stockwork, and breccias. The veins can be classified into three stages, namely, early, main, and late stages, and gold mineralization is related to the main stage. The mineral assemblage of the matrix of breccia and the veins are both composed of quartz, carbonate (mainly ankerite), and albite. High‐grade gold ores in the Salu Bulo prospect are accompanied by intense alteration, such as carbonatization, albitization, silicification, and sulfidation along the main stage veins and breccia. Alteration mineral assemblage includes ankerite ± calcite, quartz, albite, and pyrite along with minor sericite. Pyrite is the most abundant sulfide mineral that is spatially related to native gold and electrum (<2–42 μm in size). It is more abundant as dissemination in the altered host rocks than those in veins. This suggests that water–rock interaction played a role to precipitate pyrite and Au in the Salu Bulo prospect. The Au contents of intensely altered host rocks and ores have positive correlations with Ag, Ni, Mo, and Na. Fluid inclusions in the veins of the main stage and the matrix of breccia are mainly two‐phase liquid‐rich inclusions with minor two‐phase, vapor‐rich, and single‐phase liquid or vapor inclusions. CO₂ and N₂ gases are detected in the fluid inclusions by Laser Raman microspectrometry. Fluid boiling probably occurred when the fluid was trapped at approximately 120–190 m below the paleo water table. δ¹⁸O_SMOW values of fluid, +5.8 and +7.6‰, calculated from δ¹⁸O_SMOW of quartz from the main stage vein indicate oxygen isotopic exchange with wall rocks during deep circulation. δ³⁴S_CDT of pyrite narrowly ranges from −2.0 to +3.4‰, suggesting a single source of sulfur. Gold mineralization in the Salu Bulo prospect occurred in an epithermal condition, after the metamorphism of the host rocks. It formed at a relatively shallow depth from fluids with low to moderate salinity (3.0–8.5 wt% NaCl equiv.). The temperature and pressure of ore formation range from 190 to 210°C and 1.2 to 1.9 MPa, respectively.

中文翻译：

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印度尼西亚苏拉威西岛Salu Bulo矿床金矿化的地质和地球化学特征

Salu Bulo勘探区是印尼西部苏拉威西省中部地区Awak Mas项目的黄金勘探区之一。金矿化是由沉积在拉提莫容变质复合体的中火山岩和火山碎屑岩中的。矿石大约三米厚，由脉，储层和角砾岩组成。脉可分为三个阶段，即早期，主要和晚期，金矿化与主要阶段有关。角砾岩基质和脉脉的矿物组合均由石英，碳酸盐（主要是铁矾石）和钠长石组成。萨卢布洛（Salu Bulo）勘探区的高档金矿石伴随着剧烈的变化，例如碳化，阿尔比特化，硅化，和硫化沿主要阶段的静脉和角砾岩。蚀变矿物组合包括铁矿石±方解石，石英，钠长石和黄铁矿以及次要绢云母。黄铁矿是最丰富的硫化物矿物，与天然金和电子在空间上相关（尺寸小于2–42μm）。它在改变后的宿主岩石中的分布比在脉中的丰富。这表明在Salu Bulo矿床中水-岩相互作用起到了沉淀黄铁矿和Au的作用。强烈变化的基质岩石和矿石中的Au含量与Ag，Ni，Mo和Na具有正相关。主阶段静脉和角砾岩基质中的流体包裹体主要为两相富液包裹体，少量为两相，富蒸气性和单相液态或蒸气包裹体。一氧化碳 石英，钠长石和黄铁矿以及次要绢云母。黄铁矿是最丰富的硫化物矿物，与天然金和电子在空间上相关（尺寸小于2–42μm）。它在改变后的宿主岩石中的分布比在脉中的丰富。这表明在Salu Bulo矿床中水-岩相互作用起到了沉淀黄铁矿和Au的作用。强烈变化的基质岩石和矿石中的Au含量与Ag，Ni，Mo和Na具有正相关。主阶段静脉和角砾岩基质中的流体包裹体主要为两相富液包裹体，少量为两相，富蒸气性和单相液态或蒸气包裹体。一氧化碳 石英，钠长石和黄铁矿以及次要绢云母。黄铁矿是最丰富的硫化物矿物，与天然金和电子在空间上相关（尺寸小于2–42μm）。它在改变后的宿主岩石中的分布比在脉中的丰富。这表明在Salu Bulo矿床中水-岩相互作用起到了沉淀黄铁矿和Au的作用。强烈变化的基质岩石和矿石中的Au含量与Ag，Ni，Mo和Na具有正相关。主阶段静脉和角砾岩基质中的流体包裹体主要为两相富液包裹体，少量为两相，富蒸气性和单相液态或蒸气包裹体。一氧化碳 它在蚀变后的岩石中的扩散比在脉中的丰富。这表明在Salu Bulo矿床中水-岩相互作用起到了沉淀黄铁矿和Au的作用。强烈变化的基质岩石和矿石中的Au含量与Ag，Ni，Mo和Na具有正相关。主阶段静脉和角砾岩基质中的流体包裹体主要为两相富液包裹体，少量为两相，富蒸气性和单相液态或蒸气包裹体。一氧化碳 它在改变后的宿主岩石中的分布比在脉中的丰富。这表明在Salu Bulo矿床中水与岩石的相互作用起到了沉淀黄铁矿和Au的作用。强烈变化的基质岩石和矿石中的Au含量与Ag，Ni，Mo和Na具有正相关。主阶段静脉和角砾岩基质中的流体包裹体主要为两相富液包裹体，少量为两相，富蒸气性和单相液态或蒸气包裹体。一氧化碳 主阶段静脉和角砾岩基质中的流体包裹体主要为两相富液包裹体，少量为两相，富蒸气性和单相液态或蒸气包裹体。一氧化碳 主要阶段的静脉和角砾岩基质中的流体包裹体主要为两相富液包裹体，少量为两相，富蒸气性和单相液态或蒸气包裹体。一氧化碳通过激光拉曼光谱法在流体夹杂物中检测到₂和N ₂气体。当流体被困在古地下水位以下约120–190 m时，可能发生流体沸腾。δ ^18个ø _SMOW的流体，值5.8和7.6 +‰，从计算出的δ ¹⁸ ö _SMOW从主级石英的静脉表明氧同位素与围岩深循环期间交换。δ ³⁴小号_CDT黄铁矿的含量范围从-2.0到+ 3.4‰，表明存在单一的硫源。Salu Bulo矿床中的金矿化是在超热条件下发生的，发生于宿主岩石的变质作用之后。它是由盐度较低至中等（3.0-8.5 wt％NaCl当量）的流体在相对浅的深度形成的。成矿的温度和压力分别为190至210℃和1.2至1.9 MPa。