甘肃宕昌县下坪头一带锑矿地质特征及找矿标志

摘要

甘肃宕昌县下坪头锑矿床位于甘肃省宕昌县，处甘肃厂坝原代家庄铅锌金银成矿带中部。该成矿带内已发现有著名的代家庄铅锌矿、厂坝铅锌矿、崖湾锑矿等蚀变岩型铅锌锑矿，是一中低温热液破碎带蚀变岩型锑矿床。矿体赋存于泥盆系鱼池坝组泥灰岩夹灰岩及粉砂质灰质板岩中，北西原南东向逆断裂控制了矿体的产出，印支期酸性岩浆活动及华力西期小儿山超基性岩与成矿关系密切。本文通过对该区地质特征及矿床特征分析，提出了控矿因素及找矿标志。%Xiapingtou antimony ore bed is located in Dangchang County, Gansu Province, it is in the central Gansu Changba-Daijiazhuang lead and zinc silver and gold metallogenic belt. This metallogenic belt has famous Daijiazhuang lead-zinc mine, Changba lead-zinc mine, Yawan antimony and other altered rock lead-zinc-and antimony ore. It is a kind of medium and low temperature hydrothermal fracture zone altered rock antimony deposit. Orebodies occur in Nipen pond Yuchi dam marl clip limestone and aleuritic texture lime slate, the northwest - southeast overthrust fault belt control the output of the ore bodies, the activity of Indo-Chinese epoch acidic magmatic and variscan mountain ultrabasic rocks closely associate with mineralization. In this article, through analyzing the geological features and ore deposit, ore controlling factors and prospecting marks are put forward.