西藏冈底斯成矿带某盆地铀矿化地质特征与找矿方向

Geological Features and Range of Reconnaissance for Uranium Mineralization in a Basin,Gangdisê Metallogenic Belt,Tibet

该盆地位于青藏高原冈底斯山脉东缘,是一个经历多期次火山作用及碰撞、挤压、抬升形成的新生代山间断陷盆地。近年来,四川省核工业地质调查院在该盆地北缘上新统嘎扎村组和宗当村组相继发现大量铀异常。铀矿化主要产于凝灰岩、砂岩、砂砾岩和中基性火山岩及石英(斑)岩之中,且矿化类型多样,铀异常点分布广,具有良好的找矿前景。通过对该盆地地质特征及铀矿化特征的初步研究,拟探讨西藏冈底斯成矿带新生代盆地铀矿找矿方向和线索。

The studied basin lies in the eastern margin of the Gangdisê Mts.and is a Cenozoic intermountain basin which underwent multiphase volcanism and tectonism.Many uranium geochemical anomalies occur in the Pliocene Gazhacun Formation and Zhongdangcun Formation on the northern margin of the basin.The uranium mineralization is confined to tuff,sandstone,granulite,intermediate and basic volcanic rock as well as quartz porphyry.This paper makes an approach to geological features of uranium in the basin and range of reconnaissance for the uranium mineralization in the Gangdisê metallogenic belt.