五台地区太白维山大型银矿床水系沉积物综合异常信息的提取

EXTRACTION OF COMPOSITE ANOMALOUS INFORMATION FROM DATA OF STREAM SEDIMENT OF TAIBAIWEISHAN LARGE SIZED SILVER DEPOSIT, WUTAI DISTRICT

太白维山大型银矿床为典型的中低温火山潜火山隐爆角砾岩型银矿床。其水系沉积物异常强度高、面积大、元素套合好，Ａｇ、Ｐｂ、Ｚｎ、Ｍｎ等单元素异常中心与矿床的产出部位一致。利用１∶２０万水系沉积物资料，在各单元素异常成图的基础上筛选出主成矿因子得分图、相似距离评价法、以及ＡｇＣｕＰｂＺｎＣｄ／（Ｃｕ＋Ｚｎ＋Ｐｂ）、ＡｇＰｂＺｎＣｄ／（ＡｕＣｕＣｏＮｉ）等异常综合指标，应用到其他银多金属矿化区。

Taibaiweishan large sized silver deposit is a typical cryptoexplosive breccia type deposit of low to moderate temperature volcanics subvolcanics. The characteristic of its stream sediment anomaly is high anomaly intensity, large area and good identity of concentration centres for elements. The concentration centres of Ag, Pb, Zn and Mn etc. are identical to the occurrence of the deposit in space. On the basis of graphing diagrams of element anomalies by using data of 1∶200000 stream sediment measurement in the area, the score map of main metallogenic factor, evaluation method of correlation distance, AgCuPbZnCd/(Cu+Pb+Zn) and AgPbZnCd/(AuCuCoNi) synthetic indexes of anomaly etc. are chosen as composite anomalous indicatrices. Furthermore, these indicatrices are ultilized in other areas and some good results are obtained.