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引用本文:李胜祥1 韩效忠1 蔡煜琦1 郑恩玖2 王保群2. 伊犁盆地南缘西段中下侏罗统水西沟群沉积体系及其对铀成矿的控制作用[J]. 中国地质, 2006, 33(3): 582-590.
LI Shengxiang1, HAN Xiaozhong1, CAI Yuqi1, ZHENG Enjiu2, WANG Baoqun2. Depositional system of the Jurassic Shuixigou Group in the LowerMiddle western segment of the southern margin of the Ili basin and Its controls on uranium mineralization[J]. Geology in China, 2006, 33(3): 582-590(in Chinese with English abstract).
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伊犁盆地南缘西段中下侏罗统水西沟群沉积体系及其对铀成矿的控制作用
李胜祥1 韩效忠1 蔡煜琦1 郑恩玖2 王保群21,2
1. 核工业北京地质研究院,北京100029;2. 核工业216大队,新疆 乌鲁木齐830011
摘要:
提要:通过野外地质露头和钻孔岩心观察以及对大量钻孔岩心编录和测井解释资料的综合统计分析,笔者将伊犁盆地南缘西段中下侏罗统水西沟群划分出4个大的沉积体系:八道湾组(J1b)的冲积扇沉积体系、三工河组—西山窑组一段的辫状河三角洲沉积体系、西山窑组二段至三段的浅湖沼泽沉积体系和西山窑组四段至五段的曲流河三角洲沉积体系。文中详细讨论了伊犁盆地南缘西段水西沟群各沉积体系的沉积相特征,研究了水西沟群沉积体系及沉积相与砂岩型铀矿的成矿关系,指出辫状河三角洲沉积体系是砂岩型铀矿成矿最有利的沉积体系,三角洲前缘河口坝及席状砂亚相、三角洲平原辫状河流亚相、扇中-扇端亚相及三角洲平原分流河道亚相是砂岩型铀矿主要的控矿沉积相。
关键词:  伊犁盆地  水西沟群  沉积体系  沉积相  砂岩型铀矿
DOI:
分类号:
基金项目:国家重点基础研究发展规划项目(2001 CB409808)资助。
Depositional system of the Jurassic Shuixigou Group in the LowerMiddle western segment of the southern margin of the Ili basin and Its controls on uranium mineralization
LI Shengxiang1, HAN Xiaozhong1, CAI Yuqi1, ZHENG Enjiu2, WANG Baoqun21,2
1.Beijing Research Institute of Uranium Geology, Beijing 100029, China;2.Geological Party No. 216, China National Nuclear Corporation, Dui? R ü MQI 830011, Xinjiang, China
Abstract:
Abstract:The Jurassic Shuixigou Group in the LowerMiddle western segment of the southern margin of the Ili basin is divided into four depositional systems based on field geological observations of outcrops and borehole cores and statistic analysis of plenty of borehole core records and logging interpretation data. The four depositional systems are the alluvial fan depositi Onal system of the Lower Jurassic Badaowan Formation, braided delta depositional system of the Lower Jurassic Sangonghe Formation and Middle Jurassic Lower Xishanyao Formation, shallow lacustrine and swampy depositional system of the Middle Jurassic Middle Xishanyao Formation and meandering river depositional system of the Middle Jurassic Upper Xishanyao Formation. The sed Imentary facies characteristics of each depositional system of the Shuixigou Group in western segment of the southern margin of the Ili basin are discussed in detail and the relationship between the formation of uranium deposits and the depositional Sandstonetype system and sedimentary facies of the Shuixigou Group is studied. The braided delta depositional system is the MOS T favorable one for the formation of uranium deposits whereas Sandstonetype; the distributary mouth bar and sheet sand subfacies of the delta front facies, the braided stream subfacies and the distributary channel subfacies of the delta plain facies and the and distal fan subfacies of Midfan the alluvial fan facies are the major sedimentary facies for sandsto Orecontrolling Netype uranium deposits.
Key words:  Ili basin  Shuixigou Group  depositional system  sedimentary facies  uranium deposit Sandstonetype