甘肃北山拾金坡—南金滩地区水系沉积物地球化学特征及找矿远景

依据甘肃北山拾金坡—南金滩地区1∶5万水系沉积物测量成果,研究了区内元素分布、单元素异常及异常元素组合特征,共圈出11处综合地球化学异常,结合异常所处的地质特征,划分为4类11处成矿远景区。第一类综合异常处于中酸性侵入岩区,与断裂构造密切相关,以Au为主成矿元素,是寻找蚀变岩型和石英脉型金矿的有利地区;第二类综合异常处于蓟县系平头山组地层区,是寻找喷流沉积型铅锌矿、铁矿及矽卡岩型多金属矿的有利地区;第三类综合异常处于敦煌群地层出露区,是寻找变质热液型金矿的有利地区;第四类综合异常与基性—超基性杂岩体有关,是寻找铜镍矿的有利地区。

Geochemical characteristics of stream sediments and prospecting direction in the Shijinpo-Nanjintan area of Beishan, Gansu Province

Based on the result of the stream sediment survey in Shijinpo-Nanjintan area of Gansu Province, the authors studied the characteristics of the elements distribution, the single element anomaly and the element assemblage. According to the distribution of element anomalies, the types of assemblages and theanomaly controlling factors, thestudy area is subdivided into 11 anomalous zones. The eleven anomalous zones can be further divided into four types: the first kind of anomalies is related to the intermediate acid intrusive rocks and the fracture structures, and Au is the main metallogenic element. The anomalous zones are the potential areas of quartz vein type and broken belt type gold deposits. The second type of the anomalies is related to the formation of the Jixian system, and these anomalous zones are the important potential areas of Pb, Zn, Fe and polymetallic deposits. The third type of the anomalous zones is related to the Dunhuang system, and the anomalous zones are potential areas of metamorphic hydrothermal type gold deposits. The fourth type of the anomalous zones is related to the intrusion of basic-ultrabasic complex, and the anomalous zones are the potential areas of magmatic liquation Cu-Ni sulfide deposits.