辽宁二道沟金矿区西对面沟花岗岩类地球化学特征及其意义

Petrogeochemistry and Its Significances for the Xiduimiangou Granitoid Intrusive in the Erdaogou Au Ore District, Liaoning

本文对辽宁朝阳地区二道沟金矿区内的西对面沟花岗质岩体开展了相关研究。西对面沟岩体中心相为斑状花岗闪长岩,边缘相为花岗闪长岩,其地球化学特征为富钠,高锶,重稀土亏损,无明显的负铕异常或具有微弱正铕异常。结合区域资料和前人研究成果,认为西对面沟岩体形成与造山作用有关,为造山后或陆内拉张作用的产物,并且为后期成矿提供必要条件,较为合理的解释二道沟金矿金矿化作用及金矿脉分布的原因。

The Xiduimiangou granitoid intrusive in the Erdaohou Au ore district, Chaoyang, Liaoning. It is composed of porphyritic granodiorite(center phase) and granodiorite(marginal phase). Geochemically, the granitoid intrusive is rich Na and Sr and depletion in HREE without obvious Eu anomaly. The granitoid intrusive was emplaced under intracontinental extension condition in the post-orogenesis, providing necessary conditions for the Au mineralization.