新疆西准噶尔汗吉尕地区火山岩型铀矿成矿特征

Characteristics of Volcanic Type Uranium Mineralization in Hanjiga Area of West Jungaer in Xinjiang

西准噶尔汗吉尕地区位于天山-塔里木古板块赛里木地块与准噶尔阿拉套早古生代外岛弧带碰撞区,由于板块俯冲挤压,外岛弧带超壳深大断裂的复活,晚古生代裂陷槽边缘发育了一组东西走向、以中心式喷发为主的串珠状早二叠世火山岩带。该火山岩带及火山机构控制了区内热液铀矿床的产出。本文试图在阐述早二叠世火山岩带及火山机构地质特征的基础上,以两个铀矿点为例,分析西准噶尔汗吉尕地区火山岩型铀矿成矿作用与二叠纪安山玢岩、石英斑岩、流纹斑岩的相关性,探讨铀矿的产出特征,为西准噶尔地区进一步寻找火山岩型铀矿提供参考。

The Hanjiga area of west Jungaer is located in collosion belt between the Sailimu block of Tianshan-Tarim plate and the Jungaer-Alataw outer island arc of Early Paleozoic. The subduction and compression by the plate revivified the super-deep fault-belt in the outside of the island arc, a east-west extending beadlike volcanic belt of central eruption was developed in Permian to the margin of Later Pale- ozoic Aulacogen, volcanic and structure in the belt had control on the occurrences of uranium mineraliza- tion. This article tries to expound the geological characteristics of the Permian volcanic belt at first and then analyzed the correlation of rock types such as andesite-porphyrite, quartz porphyry and Rhyolite porphyry to uranium mineralization in the Hanjiga of west Jungaer with two cases of uranium occurrences so as to provide some refenreces for further uranium prospecting in west Jungaer.