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文章从广龙坡铅锌矿地质特征出发,对广龙坡铅锌矿及其所在的湘黔铅锌矿带上铅锌矿的成矿机理进行了分析。成矿经历了沉积和改造两个阶段,沉积发生在早寒武世的浅水潮下斜坡相环境,主要形成硫源层;改造主要发生在早奥陶世和早志留世,中低温区域热液流体主要提供铅、锌物源。还原硫对铅、锌物源具有捕获功能而成矿,故铅锌矿仅赋存在藻礁灰岩之中,因其上缺乏盖层,故矿石品位总体偏低。区域内地层中铅、锌元素背景值偏高。矿床成因为沉积改造型中—低温热液矿床,为典型的MVT型矿床。
Based on the geological characteristics of the Guanglongpo Pb-Zn deposit, the paper analyzes the ore-forming mechanism of Pb-Zn deposits in the Guanglongpo lead-zinc mine and the Xiangqian Pb-Zn ore belt where it is located. The metallogenesis experienced two stages of sedimentation and alteration. Sediments occurred in the Shaoxing-Lower environment during the Early Cambrian and mainly formed the sulfur source. The alteration mainly took place in the areas of the Early Ordovician and Early Silurian, Fluid mainly provide lead, zinc source. Reducing sulfur has the function of trapping lead and zinc and mineralizing. Therefore, lead and zinc deposits only exist in algae reef limestone. Because of the lack of caprock on it, ore grade is generally low. The lead and zinc elements in the strata have high background values. The genesis of the deposit is the sedimentary remodeling medium-low temperature hydrothermal deposit, which is a typical MVT deposit.