甘肃省东虎沟金矿地质特征及找矿方向

Geological Characteristics and Prospecting Direction of the Donghugou Gold Deposit in Gansu Province

东虎沟金矿位于甘肃省北山多金属成矿带的南侧,矿脉受褶皱、断裂构造控制呈脉状、透镜状产出。矿石以糜棱岩型、糜棱岩夹石英细脉型为主,金主要呈片状、粒状赋存在石英中、石英–硫化物的裂隙或硫化物颗粒的边缘。华力西期岩浆岩侵入具多期性,而斜长花岗岩亦为有利的含矿岩性。剪切带相互交接、复合的蚀变破碎带中彭大变宽、局部断面弧形弯曲及分枝复合部位是找矿的有利地段。

Donghugou gold deposit is located at the southern margin of Beishan polymetallic metallogenic belt, Gansu province. Controlled by folds and fults, orebodies occur as veins and lenticles. The deposit consists of disseminated ores and subordinate auriferious quartz veins. Platy and granulous native gold occurs mainly as inclusions in quartz, or as veinlets filling microfractures of quartz and sulfides, or attaches to sulfides. Variscan magmatism has multiple episodes and plagiogranite is the favorable ore-bearing geological unit. The joints of shear zone, jogs and bends, bifurcations and splays are favorable parts for ores.