青海省大场地区造山型铜钼矿床的潜力分析

Potential analysis of orogenic-type copper-molybdenum deposits in Dachang area,Qinghai Province

造山过程中会引起金、银、铜、铅锌、钼等成矿元素发生一定程度的活化、迁移和富集矿化。形成造山型矿床—以金矿床在表层,银、铜、铅锌、钼等矿床在深部或金与银、铜、铅锌、钼等成矿元素伴生的金多金属矿床。大场地区的大场、加给陇洼等金矿床均属于造山型金矿床,但未发现银、铜、铅锌、钼矿床的伴生,该区地球化学特征显示:元素组合以金砷锑为主;说明该区剥蚀作用较弱,研究该区各成矿元素地球化学图发现,铜钼两种元素在该区呈高背景,为造山作用引起。通过降低铜钼的异常下限,圈出一些铜钼异常,根据这些异常结合已有成矿事实、地质构造,圈定出两处隐伏矿预测区,预测区内发现弱化探异常与弱物探异常套合较好,在预测区内寻找造山型铜钼矿床的潜力较大。

During the orogenic process, gold, silver, copper, lead and zinc, molybdenum and other ore-forming elements have been activated, migrated and enriched to a certain extent. Formation of orogenic-type Deposits-gold deposits in the surface layer of silver, copper, lead and zinc, molybdenum and other deposits in the deep or gold and silver, copper, lead and zinc, molybdenum and other metallogenic elements associated with gold polymetallic deposits.Dachang area, in addition to the long depression of Dachang gold deposit belong to orogenic-type gold deposits, but no silver, copper, lead and zinc, molybdenum deposit, according to the elements for gold and arsenic antimony; it shows that the weaker denudation, the area of each metallogenic element geochemical map, two elements of copper Mo was high background in the area, due to orogenesis. The abnormal lower limit of copper and molybdenum, copper and molybdenum circle some abnormal, according to these anomalies with existing metallogenic facts, geological structure delineated two area prediction of concealed ore prediction area found weakening geochemical anomaly and weak geophysical anomaly fit better, in predicting area for orogenic-type copper molybdenum ore bed potential.