| 粤北下庄矿田新生代构造演化及其对铀成矿的影响 |
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| 引用本文： | 王军,赖中信,张辉仁,汤世凯,杨坤光.粤北下庄矿田新生代构造演化及其对铀成矿的影响[J].大地构造与成矿学,2011,35(3):355-363. |
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| 作者姓名： | 王军 赖中信 张辉仁 汤世凯 杨坤光 |
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| 作者单位： | 1. 中国地质大学(武汉)地球科学学院;湖北武汉430074;中国地质大学(武汉)构造与油气资源教育部重点实验室;湖北武汉430074
2. 广东省核工业地质局二九三大队,广东广州,510800 |
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| 基金项目： | 国家自然科学基金，广东省核工业局 |
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| 摘 要： | 粤北南岭地区是我国重要的花岗岩型铀矿产地,通过野外地质调查与构造变形研究,结合34件石英脉体电子自旋共振(ESR)测年研究,论述了粤北地区下庄矿田的新生代构造演化期次.构造变形研究与ESR年龄测定显示:新生代主要发生了三幕构造变形,第Ⅰ幕(65.5～55.0Ma)为地块的差异升降运动,断裂活动规模大；第Ⅱ幕(40.3～...
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| 关 键 词： | 新生代构造演化 ESR测年 铀矿 粤北下庄矿田 |
Cenozoic Tectonic Evolution and its Influence on Uranium Ore-forming Processes in the Xiazhuang Ore Field, Northern Guangdong Province |
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| WANG Jun,LAI Zhongxin,ZHANG Huiren,TANG Shikai,YANG Kunguang.Cenozoic Tectonic Evolution and its Influence on Uranium Ore-forming Processes in the Xiazhuang Ore Field, Northern Guangdong Province[J].Geotectonica et Metallogenia,2011,35(3):355-363. |
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| Authors: | WANG Jun LAI Zhongxin ZHANG Huiren TANG Shikai YANG Kunguang |
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| Abstract: | The Nanling area in northern Guangdong Province is important for its granitic uranium deposits.The characteristics of the structures and ESR ages of the hydrothermal quartz show that the ore field underwent three stages of structural deformation in Cenozoic:(65.5~55.0Ma) differential uplifting of land mass and colossal faults movements;Ⅱ(40.3~20.0Ma) intermittent faulting and uplifting,Ⅲ(20.0~2.2Ma) frequent small scale hydrothermal activities.ESR ages of hydrothermal quartz and U-Pb ages of pitchblender from 331,335,336 uranium deposits demonstrate that the U mineralization took place no later than 60Ma±,which is consistent with the first stage deformation.The second and third stage deformation resulted in uplifting and frequent faulting.The NNE,NEE and the EW-trending structures exhibit chess-board pattern in horizontal and graben-like pattern vertically.The structures aggravated weathering,leaching and denudation processes,and finally destroyed the pre-exist metallogenic environment.Thus,study of the Cenozoic tectonic evolution may contribute to the understanding of the tectonic controls on the uranium ore forming processes. |
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| Keywords: | Cenozoic tectonic evolution ESR dating uranium ore Xiazhuang ore field |
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