摘要
东沟构造蚀变岩—石英脉型金矿床,位于关子镇—元家坪和娘娘坝—舒家坝两条韧性剪切带与天子山和磨扇沟花岗岩体的夹持区,金矿化严格受其次级近EW向断裂控制,后期断裂构造对矿体具一定破坏作用。矿石类型地表以构造蚀变岩型为主,向深部过渡为石英脉型,褐铁矿、黄铁矿、毒砂是主要载金矿物。围岩蚀变以硅化、褐铁矿化、黄铁矿化、绢云母化为特征。中基性火山岩、韧脆性断裂构造、中酸性岩浆侵入"三位一体"是控制矿床形成的基本条件,近EW向断裂蚀变带及延伸部位是找矿有利地段。
Donggou gold deposit is belonged to quartz vein type and tectonic altered rock type, situated in the area between 2 ductile shear zones of Guanzizhen-Yuanjiaping and Niangniangba-Sujiaba, and Tianzishan and Moshangou granitic intrusion. The mineralization of gold is strictly controlled by ssubsidiary fracture striking EW, destroyed slightly by the following fracture structure. The most of ore is tectonic altered rock on the surface type, and transited as quartz vein type towards depth. The minerals of gold-bearing are limonite, pyrite and arsenopyrite mostly. The alteration of wall rock is characterized by silicification, limonitization, pyritization, and sericitization. The triple conditions of intermediate and basic volcanic rocks, ductile fracture and intermediate- acid magmatic intrusion are the key factors controlling the formation of deposit, and the altered zone of fracture and its＇ extension are the favorable place for prospecting.
出处
《甘肃地质》
2008年第4期45-50,共6页
Gansu Geology
关键词
金矿
地质特征
找矿方向
甘肃东沟
gold deposit
geological characteristics
prospecting direction
Donggou
Gansu
