四川石棉地区碲成矿地质背景、地球化学特征及其地质意义

大水沟碲矿床作为世界唯一碲独立成矿矿床，从它的偶然发现至今，一直倍受关注，但一直缺乏相关的探寻与对类似碲矿床的地球化学理论方法研究。石棉地区主要富集与基性岩浆活动有关的亲基性场元素或氧化物，Te、Bi成矿元素的整体含量不高，发生不同程度的贫化，碲在二叠系、志留系通化岩组、奥陶系大河边组、震旦系及二叠—三叠纪侵入岩中具有较好的局部富集和成矿潜力。虽然碲矿区内各元素含量水平不高，但Te、Bi平均含量高于石棉地区平均含量，接近西南五省背景值。根据碲成矿地质背景、石棉地区与碲矿区的地球化学特征，建立碲矿的地球化学找矿模型，运用模型为石棉地区提供了最具潜力的碲找矿靶区与方向，部分靶区已发现碲矿脉或矿化。

Geological background of tellurium mineralization,geochemistry and its geological significance in Shimian region,Sichuan

Dashuigou tellurium deposit is the only known independent Te ore deposit in the world. Since accidental discovery, it has attracted much attention and research from scholars. However, there has been a lack of relevant geochemical theories and methods for exploring Te deposits similar to Dashuigou tellurium deposit. The basic field elements or oxides related to basic magmatic activity are enriched, and the overall content of Te and Bi is not high, resulting in different degrees of depletion in Shimian region. There has a good concentration and metallogenic potential of Te in Permian, Silurian Tonghua Formation, Ordovician Dahebian formation, Sinian and Permian-Triassic intrusive rocks. The content of elements in stream sediments is not high in Dashuigou Te deposit area, the average content of Te and Bi is higher than that of Shimian region, but close to the background value of five provinces in Southwest China. There has a certain metallogenic potential for Te. On the basis of the geological background of Te mineralization and the geochemical characteristics in Shimian region and Dashuigou Te deposit area, a geochemical model for Te deposits is established. Six most potential prospecting targets were identified for Te minerals by this model. Already, Te veins or mineralization have been found in some of these areas.