The “Bleaching of Sandstone” Characteristics and Its Implications of the Kangxi Lead-Zinc Deposit in Wuqia County, Xinjiang
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摘要: 新疆乌恰县康西铅锌矿位于西南天山造山带与西昆仑造山带接合部，塔里木盆地西北侧，是近年来在西南天山乌拉根铅锌成矿带找矿取得较大进展的一个矿床。铅锌矿体赋存于下白垩统克孜勒苏群（K1kz）砂砾岩之中，赋矿砂砾岩在区域上颜色一般为红色、紫红色，但含矿地段变化为灰白色、灰色，显示出“砂岩漂白”特征。“砂岩漂白”是油气发生大规模逸散的标志之一。矿区岩矿石的有机碳、总硫、Fe2+/Fe3+、有机地球化学测试表明，油气是氧化还原作用中的还原剂，油气活动参与了康西铅锌矿床的成矿过程。结合区域地质演化认为，印度-亚洲板块碰撞导致帕米尔前缘断裂在本区内与南天山造山带对接，区域活动断裂造成了盆地内古油气藏的破坏，油气在运移过程中促进了铅锌元素活化、迁移、沉淀乃至成矿。Abstract: Situated the binding site between Southwest Tianshan and West Kunlun orogenic belts,the Kangxi lead-zinc deposit is located in the northwest edge of TarimBasin,which isa prospecting deposit in the Wulagen lead-zinc metallogenic belt of Southwest Tianshan in recent years.The lead-zincore-bodies were occurred in the glutenite of Lower Cretaceous Kzlesu Formation (K1kz), the colors of ore-bearing rocks generally are red and purple on the region, but ore-containing area changes into hoary and gray color, showing the "bleaching of sandstone" characteristics. The bleached sandstone is one of the symbols of a massive oil and gas from escaping. Organic carbon, total sulfur, Fe2+/Fe3+ organic geochemical tests show that the oil and gas serve as the reducing agents of oxidation reduction effect, and that the oil and gas activities were involved in the metallogenic process of Kangxilead-zinc deposit.In combination with regional geological evolution, it's believed that India-Asia plate collision led to Pamir frontal fracture in this area and the Southwest Tianshan orogenic belt and docking, the regional active faults caused basin ancient reservoir, the oil and gas in the process of migration promoted the activation, migration, precipitation and mineralization of lead and zinc element.
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