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通过对3110矿床不同成矿阶段石英流体包裹体成分的研究,阐述了该矿床成矿的物理化学环境。该矿床成矿流体来源于改造围岩的构造热液和大气降水混合。成矿流体中铀的迁移形式,矿前期为UO2(CO3)4-3(77.4%)和UO2(CO3)2-2(22.5%);成矿期为UO2(CO3)2-2(99.9%);矿后期UO2(CO3)4-3(54.4%)和UO2(CO3)2-2(42.0%)。矿化是在混合热液运移至向斜层间破碎带时,随着T,pH值,fO2,fS2逐步降低和Eh值的升高,以及围岩有机质的吸附、还原而形成的。区域构造的活动有多阶段性。早期的压剪作用和晚期的伸展与成矿有密切关系。构造为铀等成矿物质活化转移提供了主要力源,而且制约着成矿环境和条件的变化。提出该矿床为构控+层控的多因复成型铀矿床。
Through the study of the composition of quartz fluid inclusions in different mineralization stages of 3110 deposit, the physico-chemical environment of ore-forming in this deposit is expounded. The ore-forming fluid of this deposit comes from the mixture of tectonic hydrothermal and atmospheric precipitation that remolded the surrounding rock. In the ore-forming fluid, UO2 (CO3) 4-3 (77.4%) and UO2 (CO3) 2-2 (22.5% 2 (99.9%); UO2 (CO3) 4-3 (54.4%) and UO2 (CO3) 2-2 (42.0%) at the late stage of ore deposit. Mineralization is formed when the mixed hydrothermal migrate to the interlaminar crustal zone with the gradual decrease of T, pH, fO2 and fS2 and the increase of Eh, as well as the adsorption and reduction of organic matter in the surrounding rock. The multi-stage activity of regional structure. Early pressure-shear effect and late extension are closely related to metallogenesis. The structure provides the main force source for the activation and transfer of ore-forming materials such as uranium, and also restricts the changes of metallogenic environment and conditions. It is proposed that the deposit is a multi-factor complex type uranium deposit with structure control and layer control.