江西省相山铀矿田成矿模式探讨

本文在阐述相山矿田区域地质背景和成矿特征的基础上, 分析了成矿物质来源、成矿溶液来源及成矿物质迁移途径, 建立了相山矿田铀成矿模式。认为相山矿田铀成矿是受区域地质背景控制的特定时空域内的客观产物, 区域富铀地层是成矿的物质基础, 成矿溶液源自岩浆水和混入的雨水, 岩浆及期后热液是铀迁移的载体。铀成矿模式强调了火山岩成岩过程是成矿物质的富集过程, 火山岩浆期后成矿热液系统演化孕育了相山火山盆地50Ma的成矿过程, 流体降温、浓缩、混合等成矿机制的耦合, 促使了铀沉淀、成矿。 

METALLOGENIC MODEL OF THE XIANGSHAN URANIUM ORE FIELD, JIANGXI PROVINCE

The authors studied the regional geological setting and metallogenic characteristics of the Xiangshan ore field and analyzed the sources of ore substances and ore fluids and channels for transport of ore substances, and on that basis, they constructed a uranium metallogenic model for the Xiangshan ore field. Uranium metallogenesis of the Xiangshan ore field took place in a specific temporal-spatial domain controlled by the regional geological setting; regional uranium-rich strata provided substances for metallogenesis; and ore fluids derived from magmatic water, mixed meteoric water, magma and postmagmatic hydrothermal fluids were carriers of uranium transport. The uranium metallogenic model emphasizes that the formation process of volcanic rocks was a process of ore substance concentration. The evolution of the volcanic postmagmatic hydrothermal ore system gave birth to ore-forming processes with a time span of 50 Ma in the Xiangshan volcanic basin. The coupling of metallogenic mechanisms such as temperature decline, concentration and mixing of fluids promoted uranium precipitation and ore formation.