应用地球化学块体法评价厄立特里亚金矿资源潜力

以厄立特里亚1：100万水系沉积物化探数据为基础，应用地球化学块体法，选择厄立特里亚优势矿产资源Au为研究对象，结合厄立特里亚地区成矿地质背景，对厄立特里亚金矿资源潜力进行了研究。化探数据结果显示：Au元素的异常下限值为1.41 ng/g。在此基础之上，以1.41、1.78、2.23、2.81、3.54、4.46 ng/g作为分级间隔，共圈定出地球化学块体 4 个，区域异常 7 个。根据已知金矿床资源量，计算得到Au的成矿率。以 1000m 岩块厚度计算了该区Au的总供应量289801t，并预测厄立特里亚境内Au的资源量为371.7t。其中3号、4号地球化学块体应作为下步的重点找矿区域。

The application of Geochemical Blocks Methods to Gold Resources Assessment in Eritrea

Based on geochemical data obtained from 1:1,000,000 stream sediment geochemical survey in Eritrea and its metallogenic geological background, this study investigated the regional gold potential by using geochemical block method Our results indicate that the value of geochemical anomaly threshold is 1.41×10-9. Four geochemical blocks and seven regional anomalies were delineated by using 1.41×10-9, 1.78 ×10-9, 2.23×10-9, 2.81×10-9, 3.54×10-9 and 4.46 ×10-9 as the grading intervals. The calculated mineralization coefficient was based on the measured resources of the known gold deposit in Eritrea. This study shows that the total gold tonnage in these blocks is 289801t, Au resources in Eritrea (given a 1,000m thickness of every rock mass) is 371.7 t, and the geochemical blocks No.3 and No.4 should be the next key prospecting area.