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本文报道了在下庄矿田花岗岩体接触带附近的剪切构造糜棱岩带中,存在受深色蚀变岩制约的气热高温型铀成矿,它是下庄矿田发生于晚侏罗世的一次重要铀成矿作用。文中指出了韧性剪切带及气热交代蚀变岩是铀成矿的共同控制因素,同时划分了4种气热高温矿石组合类型,对各组合电子探针分析的化学成分作了较详细介绍。文章还披露了作者所测的3个矿石晶质铀矿U-Pb同位素年龄(为165—146Ma),表明属晚侏罗世成矿。此外,对以往所划分的成矿期次提出了修改的商榷意见。
This paper reports the presence of gas-hot and high-temperature uranium mineralization controlled by dark-colored altered rocks in the shear-mylonite belt near the contact zone of the granite body in the Xiazhuang ore field. This is the result of the occurrence of Xiazhuang orefield in the Late Jurassic An important uranium mineralization. It is pointed out that the ductile shear zone and gas-heat replacement alteration rocks are the common controlling factors of uranium metallogenesis. At the same time, the four types of gas-heat and high-temperature ore assemblages are divided and the chemical compositions of each combination electron probe analysis are introduced in detail . The article also discloses the U-Pb isotopic age of the three ore-derived uraninite (165-146 Ma) measured by the authors, indicating that it belongs to the Late Jurassic mineralization. In addition, the previous division of the metallogenic period proposed amendments to the discussion.