丹凤地区北部加里东期岩浆岩特征及其与铀矿化关系

丹凤地区北部加里东期岩浆岩的形成经历了挤压-过渡-拉伸3个阶段,分别形成了花岗岩体、花岗岩株和花岗伟晶岩脉,三者矿物组成、结构和构造差异性明显。岩浆运动方向是由北向南、由东向西斜向抬升,岩浆运移与结晶分异、成岩及成矿过程大致同步,铀矿化最终富集于拉伸阶段形成的黑云母花岗伟晶岩脉中,较好解释了目前落实的矿床、矿点和矿化点主要分布于花岗岩体南部花岗岩株接触带黑云母花岗伟晶岩脉中的现象,为今后该区铀矿找矿选区提供了依据。

Evolutionary features of Caledonian magmatic rock and its relationship to uranium mineralization in the northern Danfeng area

Caledonian magmatism in northern Danfeng area has experienced three tectonic stages as compression,transition and tension and formed granite batholith,granite stock and granitic pegmatite vein respectively.These rocks are obvious different in mineral component,texture and structure.Movement direction of magma is from north to south and from east to west with oblique uplifting.The transportation of magma is synchronous to the differential crystallization,diagenesis and ore-forming of uranium mineralization.The mineralization is located in biotitic granitic pegmatite veins which is formed in the final tension stage.This uranium forming mechanism can well explain the phenomenon that the deposit,occurrence,mineralizing occurrence found at present mainly distribute in the biotite granitic pegmatite veins between the contact zone of granite stock and southern granite batholith,and can be used as the criteria to select target for uranium prospecting in the area.