URANIUM SOURCES OF THE XIANGSHAN URANIUM ORE-FIELD: GEOCHEMICAL EVIDENCE
URANIUM SOURCES OF THE XIANGSHAN URANIUM ORE-FIELD: GEOCHEMICAL EVIDENCE
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发表时间：
2004
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通讯作者：
Sun Zhan-xue
中科院分区：
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作者：
Sun Zhan-xue
象山铀矿田位于中国东南部江西省，是我国最大的火山岩型铀矿田之一。在矿场中，与铀物化有关的沥青铀矿、黄铁矿等矿石的铅同位素组成具有明显的异常铅特征，其两阶段模型年龄计算结果为140 Ma，与研究区火山碎屑熔岩年龄吻合。铅同位素证据表明，矿田中的铀来源于当地的火山岩。矿石中铀、钍、钼、磷的浓度分布规律表明铀来源于围岩。水岩相互作用模拟实验表明，成矿期在异常高地热背景条件下，象山火山岩与地下水相互作用形成了铀成矿流体。
The Xiangshan uranium ore-field, located in Jiangxi Province, SE China, is one of the largest volcanic rock-related uranium ore-fields in our country. In the ore-field, the lead isotopic compositions of ores, pitchblende and pyrite associated with uranium materialization, possess obvious anomalous lead characteristics, and the calculated two-stage model age for the source materials is 140 Ma, just in consistence with the age of pyroclastic lavas in the area studied. The lead isotopic evidence suggests that uranium in the orefield be derived from local volcanic rocks. The concentration distribution patterns of uranium, thorium, molybdenum, and phosphorus in ores imply that uranium originated from wall rocks. Simulation experiment on water-rock interaction showed that the uranium ore-forming fluid could be formed from interactions between the Xiangshan volcanic rocks and groundwater under anomalously high geothermal background conditions during the metallogenic period.