甘肃大桥金矿地球化学异常特征对比

GEOCHEMICAL ANOMALY CHARACTERISTICS OF DAQIAO GOLD DEPOSIT IN GANSU PROVINCE

通过对大桥金矿成矿地质特征研究的基础上,对矿区1∶20万区域化探异常特征、1∶5万水系沉积物测量异常特征及1∶1万土壤测量异常特征进行了分析和对比,认为该区化探工作随着比例尺的增大,异常元素增多,异常强度增强,异常浓集中心更加明显,显示出主成矿元素异常和相关伴生元素的继承性和多样性。异常元素组合显示,矿区中、大比例尺化探工作圈定的异常中,金、汞、砷、锑、银等中、低温元素异常发育,成为大桥金矿重要的找矿指示元素和直接找矿指标。原生晕特征标明,金及伴生元素异常展布与矿体产状基本一致,而异常强度在顶、底板明显减弱,说明赋矿层位和岩性对矿体的分布控制作用明显。本文旨在探讨该矿床不同介质系列化探异常特征,为西秦岭区化探找金工作提供新的范例。

Based on analysis and contrast of 1：200000 regional geochemical anomaly characteristics, 1：50000 stream sediment geochemical anomaly characteristics and 1：10000 soil geochemical anomaly characteristics, that with the increased scale geochemical exploration work, appeared more and stronger geochemical anomaly elements, more obviously anomaly focusing area. It shows that the inheritance of main ore-forming anomaly elements and the diversity of relevant associated anomaly elements. According to the medium and large scale geochemical exploration work in Daqiao area, gold, mercury, arsenic, antimony, silver and other medium and low temperature element development. That become important prospecting indicators in Daqiao area. The primary halo characteristics indicate that the abnormal distribution of gold and associated elements is basically consistent with the occurrence of the ore bodies, and the abnormal intensity is obviously weakened at roof and floor. This shows that the distribution of the ore body is controlled by the ore bearing strata and the lithology. On the basis of previous studies, the prospecting marks were summarized.