浅析江川306断裂与铀矿成矿的关系

江川306铀矿点成矿时代为燕山运动晚期（U-Pb同位素年龄值为117＋29Ma）。通过野外路线调查及深部钻探查证表明：306断裂为多期活动性断裂，早期为张性断裂，晚期为逆冲断裂。断裂带内存在热液活动中心，并非沿整个断裂带都存在热液活动。热液上升的通道位于采场附近断裂带转弯膨胀部位，从而形成“蘑菇”状构造蚀变带。铀矿化赋存于构造蚀变带内硅化砂岩、砂砾岩、砾岩、泥岩中。经讨论得出：浅部（0～150m）的张一脆性断裂构造。有助于含矿溶液的运移与沉淀，后期成矿得以保存。

Analysis Jiangchuan 306 Fanlts and the Relationship Between the Uranium Mineralization

The age of mineralogenetic epoch in Uranium deposit from jiang chuan 306 is the late period of yanshan movement （the isotope age of U-Pb is 117±29Ma）. Through the field survey and deep drilling can show us that, the 306 fracture is a active polyphasic active fault, the early period of fi＇acture is the tensile fault .the late period of fracture is thrust fault. The center of hydrothermal activity exists in the fault zone. not always in the whole fault zone exists the hydrothermal activity, the hydrotherm raise from path is located in the turning expanding position which near the stope . consequently fungiform structural alteration zone comes into being . Uranium mineralization occur in silicified sandstone, glutenite, conglomerate, mudstone which are exist in the structural alteration zone .After discussion we can know that ：shallow （0-150m）is the tension-brittle fractural structure ,is contribute to migration and sediment of the ore in the solution and the late ore deposit can be saved.