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地质力学学报:2019,25(S1):84-89
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伊犁盆地南缘构造活动及对砂岩型铀矿的制约:来自磷灰石裂变径与U-Pb定年的证据
(1.中核集团铀资源勘查与评价重点实验室, 北京 100029;2.核工业北京地质研究院, 北京 100029;3.核工业二一六大队, 新疆 乌鲁木齐, 830011)
THE TECTONIC ACTIVITY IN THE SOUTHERN MARGIN OF THE ILI BASIN AND ITS CONSTRAINT ON SANDSTONE-TYPE URANIUM DEPOSITS: EVIDENCE FROM APATITE FISSION TRACK AND U-PB DATING
(1.CNNC Key Laboratory of Uranium Resources Exploration and Evaluation Techniques, Beijing 100029,China;2.Beijing Research Institute of Uranium Geology, Beijing 100029, China;3.Geological Party No.216, CNNC, Urumqi, Xinjiang 830011, China)
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中文摘要: 为了探讨伊犁盆地南缘构造活动与铀成矿关系,通过采取砂岩型铀矿含矿层砂岩样品,利用磷灰石裂变径迹热年代学与U-Pb等时线定年的方法,对伊犁盆地南缘构造活动与砂岩型铀矿成矿年龄进行了研究。研究结果表明:①伊犁盆地南缘自中生代以来经历了三期强烈的隆升—剥蚀事件,三叠纪末—中侏罗世、晚侏罗世—早白垩世、中新世—现今,对应印支末期、燕山期与喜马拉雅期三期构造活动;②盆地南缘中—西段砂岩型铀矿成矿年龄可分为158~153 Ma、108~60.5 Ma、55~15 Ma,12~0.3 Ma四期,盆地东段铀成矿年龄比较新,为7.8~5.5 Ma之间;③盆地南缘构造活动时间与铀成矿年龄具有非常好的对应性,将伊犁盆地南缘铀成矿作用过程划分为三个阶段,物源区快速抬升—含矿建造形成期及铀的预富集阶段、主成矿阶段、后生叠加改造阶段。
Abstract:In order to explore the relationship between the tectonic activity and uranium mineralization in the southern margin of Ili basin, the method of apatite fission track and U-Pb dating was used to ascertain the tectonic activity and metallogenic age of sandstone-type uranium deposits by adopting the sandstone sample of the ore bearing layer. The above research can draw some conclusions. Firstly, the southern margin of Ili basin experienced three periods of intense uplift and denudation, which were the late Indosinian tectonic activity from late Triassic to middle Jurassic, Yanshanian tectonic activity from late Jurassic to early Cretaceous and Himalayan period tectonic activity from Miocene to present respectively. Secondly, the metallogenic age of sandstone-type uranium deposits in the middle-west section of the southern margin of the basin can be divided into four stages: 158~153 Ma, 108~60.5 Ma, 55~15 Ma and 12~0.3 Ma, while the metallogenic age of sandstone-type uranium deposits in the east section was relatively new, ranging from 7.8 to 5.5 Ma. Thirdly, the tectonic activity and the metallogenic age of sandstone-type uranium deposits in the southern margin of the basin have a good correspondence. The process of uranium mineralization can be divided into three stages: rapid uplift of the source area-the formation stage of ore-bearing construction and the pre-enrichment stage of uranium, pre-enrichment, the primary mineralization and post-superimposition reconstruction stage.
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基金项目:国家科技部973计划项目(2015CB453004);中核集团集中研发项目"伊犁盆地南缘东段砂岩型铀矿定位预测与靶区优选(地LTD1612-4);国防预研项目(3210402)
引用文本:
丁波,刘红旭,李平,等,2019.伊犁盆地南缘构造活动及对砂岩型铀矿的制约:来自磷灰石裂变径与U-Pb定年的证据[J].地质力学学报,25(S1):84-89.DOI:10.12090/j.issn.1006-6616.2019.25.S1.015
DING Bo,LIU Hongxu,LI Ping,et al,2019.THE TECTONIC ACTIVITY IN THE SOUTHERN MARGIN OF THE ILI BASIN AND ITS CONSTRAINT ON SANDSTONE-TYPE URANIUM DEPOSITS: EVIDENCE FROM APATITE FISSION TRACK AND U-PB DATING[J].Journal of Geomechanics,25(S1):84-89.DOI:10.12090/j.issn.1006-6616.2019.25.S1.015

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