四川盆地龙潭向斜铀矿点铁化特征及其成因探讨

Analysis on the iron-mineralization characters and formation of uranium mineralization occurrence in Longtan syncline,Sichuan basin

本文通过对四川盆地龙潭向斜铀矿(化)点附近砂岩之中铁化特征的研究,经镜下鉴定和电子探针分析发现铁质分为三类,即碎屑状磁铁矿、胶结物状赤铁矿、薄膜状褐铁矿,通过对其矿物成分及成岩环境的鉴定和判别,认为该区含铁物质并非后生蚀变而成,而是沉积形成的一种特殊结构构造。

Based on the study of iron--mineralization characteristics in sandstone near of uranium min eralization occurrence in Longtan syncline ,Sichuan basin ;the iron were analyzed by means of optical microscope and electron probe micro--analyser （EPMA）, it can be roughly classified into three kinds,as clastic magnetite, cementitious hematite, skinny limonite. By means of assaying and differentiating the mineral composition and diagenetic environment,it is concluded that the iron-mineralization substance is not secondary alteration products ,but one kind of special sedimentation structure.