黔西南赖子山背斜东南缘卡林型金矿地质地球化学特征与成矿预测

摘要

Laizishan anticline southeast carlin-type gold (mineralization) deposit in southwest of Guizhou Province is located in connection between the southwestern margin of Yangzi paralatform and Youjiang orogenic belt,is similar to famous super-large Lannigou gold mine,they are found in the same anticline that is Laizishan anticline,and becomes important exploration area in southwest Guizhou region in recent years.We can point out the prospective areas,favorable positions and confirm target regions and calculate resources by the method of superposition comprehensive geological and geochemistry information in the study.Importantly,based on the geochemistry characteristics of prospecting zone to apply in the method,we get some information:Laizishan anticline of north-east and ramp type thrust fault that distributed in limbs of anticline and parallel anticline,those structures are good for carlin-type gold mineralization;additional,the soil geochemical characteristics contain the level of differentiation of anomalous elements and how to influence gold mineralization;in the aspect of tectonic geochemistry,elementary anomalies of Au,As,Sb,Hg and structural characteristics are combined to determine location of anomalies,relationships elements and gold mineralization;REE and carbon,oxygen isotopes of calcites can compose a discriminant that can show characteristics of fault belts that relate to ore-forming;above all,we can find out that Laizishan anticline southeast carlin-type gold(mineralization)deposit has great potential by the result of calculating resources.%黔西南赖子山背斜东南缘卡林型金矿（化）区位于扬子准地台西南缘与右江造山带的衔接部位，和著名的烂泥沟超大型金矿产于同一背斜（赖子山背斜）上，是近年来黔西南重点勘查区域。本研究综合利用区域主要地质信息来优选找矿部位，确定找矿靶区，并对其资源量进行预测计算，从而起到指导找矿的作用。重点以成矿远景区地球化学特征研究为基础进行综合信息的成矿预测，结果表明，区域内 NE 向展布的赖子山背斜及分布在背斜两翼与之平行的对冲式逆冲断层对成矿极为有利。另外，利用土壤地球化学测量方法研究异常元素之间的分异程度及其与金矿化的关系，能够确定有利成矿元素特征。将 Au、As、Sb、Hg 元素异常与构造特征相结合，可确定元素异常部位及其与金矿化的强弱关系，并结合方解石稀土及 C、O 同位素拟合的判别函数可初步判定与成矿有关的断裂带特征。将以上与成矿关系密切的因素整理进行资源量计算，结果表明该区卡林型金矿有较大的开采潜力。