李玲　党燕俐

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-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-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。

Abstract： 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.

關键词：地质；西秦岭造山带；锑矿；地质特征

Key words： geology；West Qinling orogenic belt；antimony ore；geologic feature

中图分类号：P618.66 文献标识码：A 文章编号：1006-4311（2016）07-0196-02

0 引言

甘肃宕昌县下坪头锑矿床位于秦岭造山带中秦岭华力西褶皱带，地处厂坝-页水河华力西、印支期铅锌金银成矿带上。该区1：5万水系沉积物测量显示As、Au、Hg、Cu元素异常显著。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，表明该区找矿前景较好。

1 区域地质背景

研究区大地构造位置处于西秦岭造山带中部，分跨南、北秦岭两大构造单元。同时位于代家庄-厂坝华力西、印支期铅锌金银成矿带与夏河-崖湾印支、燕山期金锑汞成矿带的结合部位，成矿条件优越。

区内出露地层有泥盆系、二叠系、三叠系、白垩系、第四系。大面积出露地层为泥盆系、三叠系。泥盆系区域上出露的主要为一套滨海-浅海-次深海相沉积的一套类复理石建造。二叠系为一套夹持于夏河-岷县区域大断裂之中，宽度仅100-500m的一套复理石建造。……