河南省淅川县金家垭锑矿床地质特征及找矿前景

Geological Characteristics and Prospecting Prospective of Jinjiaya Antimony Deposit in Xichuan County,Henan Province

金家垭锑矿床位于豫陕交界的南秦岭造山带东段淅川断裂多金属成矿带上,成矿条件较好。为深入探讨矿区找矿潜力,分别采用1∶50 000水系沉积物测量、1∶10 000地质草测、1∶2 000岩石剖面测量和槽探工程控制等方法在矿区开展了地质勘查及研究工作,并对矿区地质特征、控矿因素、找矿标志及找矿前景进行了详细探讨。研究表明:(1)矿体主要赋存于寒武系水沟口组底部一套黑色硅质岩及土黄色黏土岩部位;(2)韧性-韧脆性构造是控矿和储矿的有利空间,使地层中的成矿元素发生活化迁移,随着物理化学条件改变,锑及其他有用元素在有利部位发生沉积富集,从而形成锑矿床;(3)采用1∶50 000水系沉积物测量→1:10 000地质草测→1∶2 000岩石测量→槽探揭露方法的找矿效果明显。在上述分析的基础上,圈定了2处找矿靶区,并在靶区内发现了锑矿体,表明靶区内找矿前景较好,值得进一步开展工作。

Jinjiaya Antimony Deposit is located at Xichuan fault polymetallic metallogenic belt in the eastern part of the Southern Qinling Mountains Orogenic Belt at the junction of Henan Province and Shaanxi Province,the metallogenic conditions of the mining area is good.In order to study the prospecting potential of the area,geological prospecting and study have been carried out in the mining area by means of 1∶50 000 stream sediment survey,1∶10 000 geological sketch survey,1∶2 000 rock profile survey and trench prospecting engineering control,besides that,geological characteristics,ore-controlling factors,prospecting indicators and prospecting prospective of the mining area are discussed in detail.The study results show that:(1) the orebodies are mainly hosted in a set of black siliceous rocks and yellowish clay rocks at the bottom of Shuigoukou Formation of Cambrian System;(2)the ductile-brittle structure is a favorable space for ore-controlling and storage,which activates and migrates the ore-forming elements in the stratum,with the change of physical and chemical conditions,antimony and other useful elements are deposited and enriched at favorable areas,therefore,the antimony deposit is formed;(3)the method of 1∶50 000 stream sediment survey,1∶10 000 geological survey,1∶2 000 rock survey and trench exploration and exposure has obvious prospecting effect.Based on the above discussion results,two prospecting targets areas are delineated and antimony orebodies are found in the target areas,which indicates that the prospecting prospective of the target areas is good and they are worth conducting further prospecting work.