辽宁东岔铜钼矿床地质特征及找矿方向

Geological characteristics and prospecting direction of Dongcha copper-molybdenum deposit in Liaoning

基于该区地质调查,并采用土壤测量、高精度磁法测量、激电中梯测量等方法,总结矿床地质特征,初步探讨了东岔铜钼矿床控矿构造及找矿方向。东岔铜钼矿床受控于近东西向和北西向断裂夹持的花岗闪长岩体,矿体主要呈分枝扁豆状、脉状和透镜状产出,赋矿围岩为早白垩世花岗闪长岩。矿石矿物主要有辉钼矿、黄铜矿、黄铁矿、磁铁矿,围岩蚀变分带明显。矿床成因类型属于严格受断裂构造控制,与中酸性斑状杂岩体有关的斑岩型铜钼矿床。矿区外围西岔地区存在中酸性侵入杂岩体,断裂构造发育,蚀变类型较多,物化探异常套合良好,浓集中心明显,是寻找斑岩型铜钼矿床的重要地段。

Based on the geological investigation in this area, the author studied the geological characteristics of the deposit, also preliminarily discussed the ore-controlling structure and prospecting direction of the Dongcha copper-molybdenum deposit by means of soil survey high precision magnetic survey and intermediate gradient survey. The Dongcha deposit occurred in early Cretaceous grano- diorite, which was controlled by nearly EW and NW trending faults. The ore bodies types were mainly branched, veined and lenticular. The metallic minerals mainly consisted of molybdenum, chalcopyrite, pyrite and magnetite, and the surrounding rock alteration zone was obvious. The genetic type belonged to the porphyry copper-molybdenum deposits, which was closely controlled by the fracture structure, and related to the middle-acid porphyritic intrusive rocks. The Xicha area, outsideof the deposit, periphery existed middle- acid intrusive complex rocks. The faults and alteration were developed. As the same time, it had a coincidence between geophysical a- nomalies with geochemical anomalies as well as a strong focus. So, the Xicha area is an important place for looking for porphyry copper -molybdenum deposit.