广西五圩矿田成矿分带特征及其地质意义

Characteristics of Metallogenic Zoning in the Wuxu Ore Field of Guangxi Province and its Geological Implications

根据野外地质调查和元素地球化学特征及流体包裹体研究，将五圩矿田分为3个成矿带：中低温成矿带（I）、中温成矿带（Ⅱ）和中高温成矿带（Ⅲ）。中低温成矿带内金属矿物以辰砂、雄黄和雌黄等低温矿物为主，带内成矿温度在150℃～236℃之间，大多200℃以下；中温成矿带内金属矿物以闪锌矿、辉锑矿和黄铁矿等矿物为主，带内成矿温度在220℃-265％之间；中高温成矿带内金属矿物以深色闪锌矿、辉锑矿和方铅矿等矿物为主，带内成矿温度在245℃-322℃之间，大多在270℃以上。分析了构造的空间形态．比较了成矿流体物理化学性质，阐明了五圩矿田成矿分带特征及其地质意义，并解释了不同矿带上的矿床差异。综合五圩矿田成矿分带特征，推测箭猪坡矿床附近的深部存在隐伏岩体，以箭猪坡矿床为中心的深部是成矿有利部位，为五圩矿田的进一步找矿提供了依据。

This work was based on field geological investigation, geochemical features of elements and the study on fluid inclusions. We divided the Wuxu ore field into three metallogenic belts,which are the intermediate-and low-temperature belt（ I ） ,intermediate-temperature belt（Ⅱ ） and intermedi- ate-and high-temperature belt （ Ⅲ ）.In the belt I,metallic minerals are dominated by cinnabar, realgar, and orpiment,which formed at low temperatures. Their metallogenie temperatures are in 150℃ - 236℃, mostly below 200℃.The belt Ⅱ contains sphalerite, stibnite, and pyrite, which were generated at 220℃ -265℃ .The belt III is featured by dark sphalerite, stibnite, and galena, of which the metallogenic temperatures are 245℃ -322℃, mostly above 270℃. We analyzed the spatial patterns of the structure, compared the physicochemical properties of ore-forming fluids, elucidated geological characteristics of the Wuxu ore field and their geological implications, and explained the differences between different deposits of each metallogenic belt.We inferred that there are concealed rock bodies in the deep subsurface somewhere around the Jianzhupo deposit.The deep subsurface centered at Jianzhupo is the favorable place for mineralization.These results provide evidence for further prospecting in the Wuxu ore field