伊犁盆地南缘含矿砂体特征与铀成矿关系研究
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摘要
含矿砂体物质成分、厚度、沉积特征与渗透性,是层间氧化带砂岩型铀矿成矿不可或缺的因素。通过对伊犁盆地南缘中西段含矿砂体的厚度变化、沉积微相特征的系统分析。认为不同沉积条件下,含矿砂体特征、砂体泥质与粘土矿物含量及砂体中透镜体泥质隔挡层的数量、厚度不同,导致含矿主岩的还原能力、吸附能力的不同。地下水渗流模式的多样性,使得伊犁盆地南缘的成矿模式具有多样性。对砂体厚度研究发现,工业铀矿体大都发育在砂体厚度变化的转折部位,垂向上岩性由粗转细的界面(氧化-还原界面)是工业铀矿体易于富集的场所。
Material composition, thickness, sedimentary features and permeability of ore-bearing sandbody are indispensable factors for interlayer oxidized zone sandstone type uranium mineralization. Through systematic analysis of ore-bearing sandbody thickness variation and sedimentary microfacies features at mid-west sector south margin of Ili Basin, considered that under different sedimentary conditions, different ore-bearing sandbody features, sandbody pastes, clay mineral contents, and amount, thickness of lenticular argillaceous barrier in sandbody caused different ore-bearing host rock reducing capacity and adsorptivity. Diversity of groundwater seepage models has caused diversity of mineralization models at south margin of Ili Basin. Study on sandbody thickness has found the pay grade uranium orebodies are mostly developed at sandbody thickness turning position, vertically lithological interface turning from coarse to fine(redox interface).
Material composition, thickness, sedimentary features and permeability of ore-bearing sandbody are indispensable factors for interlayer oxidized zone sandstone type uranium mineralization. Through systematic analysis of ore-bearing sandbody thickness variation and sedimentary microfacies features at mid-west sector south margin of Ili Basin, considered that under different sedimentary conditions, different ore-bearing sandbody features, sandbody pastes, clay mineral contents, and amount, thickness of lenticular argillaceous barrier in sandbody caused different ore-bearing host rock reducing capacity and adsorptivity. Diversity of groundwater seepage models has caused diversity of mineralization models at south margin of Ili Basin. Study on sandbody thickness has found the pay grade uranium orebodies are mostly developed at sandbody thickness turning position, vertically lithological interface turning from coarse to fine(redox interface).
引文
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[2]焦养泉,吴立群,杨生科.铀储层沉积学-砂岩型铀矿勘查与开发的基础[M].北京:原子能出版社.
[3]张虎军、聂逢君、饶明辉.伊犁盆地蒙其古尔地区水西沟群砂岩型铀矿目的层岩石学特征及意义[J].地质与勘探,2012(1).
[4]刘铭艳,张占峰.伊犁盆地南缘水西沟群粘土矿物特征研究及其意义[J].铀矿地质,2007,23(5):275—282.
[5]秦明宽.新疆伊犁盆地南缘可地浸层间氧化带砂岩铀矿床成因及定位模式[D].博士论文.1997.
[6]张占峰,蒋宏,李家金,等.新疆察布查尔县蒙其古尔铀矿床P31-P55线详查地质报告[R].乌鲁木齐:核工业二一六大队,2009.
[7]晋香兰,张慧.鄂尔多斯盆地东北部侏罗系含铀矿主岩的沉积环境分析[J].西北地质,2013,46(2):153-158.
[8]张成勇,聂逢君,刘庆成.二连盆地巴彦乌拉地区砂岩型铀矿目的层点测井曲线响应分析[J].铀矿地质,2010,26(2):101-107.
[9]叶柏庄.中亚砂岩型铀矿成矿特征及其在我国的找矿思路[J].世界核地质科学,2005,22(4):192-197.
[10]康勇,王冰.伊犁盆地南缘蒙其古尔铀矿床越流补给成矿作用[J].新疆地质,2010,28(3):317—318.
[11]师志龙,王新华,段新生.新疆察布查尔县扎吉斯坦-洪海沟地段铀矿预查报告[R].乌鲁木齐:核工业二一六大队,2006.