托斯巴斯他乌金矿微量稀土元素地球化学特征及矿床成因分析

新疆青河县托斯巴斯他乌地区岩浆活动强烈,金铜元素成矿潜力突出,近年来在该区及邻区发现了多个规模不等的金、铜矿床。文章基于托斯巴斯他乌金矿为研究对象,通过对矿石的微量元素、稀土元素地球化学特征及矿床地质特征研究,简析了矿床成因、成矿物质来源。研究表明,该区矿(化)带受断裂控制明显,加马特矿化带受近EW向断裂控制,托库特拜及哈依尔很矿带受NW向断裂控制,矿化以破碎蚀变岩型为主;微量元素Th、Nd、Zr、Sm富集,Nb、Sr、Ti亏损,Ba为负异常,在蜘蛛网图中其模式曲线呈由左向右微倾斜多峰多谷形;稀土元素呈轻稀土富集,重稀土亏损,具幔壳混熔特征;托斯巴斯他乌金矿床成因应属于构造蚀变岩(热液)型。

Trace element and REE geochemistry and genesis of Tosi Bastawu Au deposit

Magmatism in Tosi Bastawu area of Qinghe county, Xinjiang Autonomous Region is strong with prospecting potential for Au, Cu ore. In recent years Au, Cu deposits in varied sizes have been discovered in the area and neighboring areas. Based on the deposits this paper deals with geochemistry of trace elements and REE of ore samples from them, their geological characteristics and discusses the genesis and ore material sources. The results show that the mineralization is dominated by the altered cataclastic rock type and the mineralization (zones) generally controlled by fault, such as Jiamate Mineralization zone by EW fault, Tuokumatebai zone and Haryierhen zone by NW fault. Trace elements show enrichment of Th, Nd, Zr and Sm, depletion of Nb, Sr and Ti, negative anomly of Ba. In the spider diagram the model curve decines slightly from left to right and is characterized by multi-peaks; REE characterized by LREE enrichment and HREE depletion and mixed melting of crustal and mantle materials. The Tosi Bastawu deposit is a hydrothermally altered cataclastic rock type Au deposit.