鄂尔多斯盆地塔然高勒地区直罗组上、下段的岩性-岩相特征及对铀成矿的差异性控制作用
投稿时间:2018-07-19  修订日期:2018-08-25  点此下载全文
引用本文:
DOI:
摘要点击次数: 25
全文下载次数: 
作者单位E-mail
朱强 中国地质调查局天津地质调查中心 zhuq1987@163.com 
李建国 中国地质调查局天津地质调查中心  
俞礽安 中国地质调查局天津地质调查中心  
司马献章 中国地质调查局天津地质调查中心  
文思博 中国地质调查局天津地质调查中心  
李光耀 中国地质调查局天津地质调查中心  
司庆红 中国地质调查局天津地质调查中心  
基金项目:国家重点基础研究发展计划(973计划,项目编号:2015CB453000)和中国地质调查局地质调查项目(DD20160127)联合资助。
中文摘要:为查明鄂尔多斯盆地塔然高勒地区直罗组上段、下段的岩性-岩相特征以及参与蚀变作用的流体强度差异,开展了系统的岩心观察、剖面对比,并结合粘土矿物、碳氧同位素和U、Th元素等手段进行分析。结果表明,研究区南部直罗组上段主要由灰绿色、红色泥岩夹透镜状红色、黄色、灰绿色砂岩组成,北部主要由红色泥岩与灰绿色砂岩构成,南北部下段均由灰白色、灰绿色砂岩或砂砾岩夹薄层泥岩组成。直罗组红色砂岩为原生沉积,灰绿色砂岩为后生改造类型;上段受含氧含铀水和深部还原性流体作用强度较下段变弱,且由北向南作用程度降低,北部还原蚀变岩石与原生岩石共存,南部基本保留原生岩石;下段则受流体改造更为充分,主体为后生蚀变岩石。直罗组不同类型砂体的展布兼受沉积相和后期流体双重作用,但强弱差异性明显,限制了铀矿化产出在直罗组下段砂体中的定位,因此,上、下段应作为不同的成矿体系讨论。
中文关键词:岩性特征  沉积环境  砂岩型铀矿  差异性控矿  直罗组上段  直罗组下段  塔然高勒
 
Lithologic-lithographic Characteristics of the Upper and Lower Parts for the Zhiluo Formation and Their Differential Control of Uranium Mineralization in the Tarangaole Area, Ordos Basin
Abstract:In order to find out the lithologic-lithographic characteristics and the differences in fluid strengths involved in alteration about the upper and lower parts of the Zhiluo Formation in Tarangaole area, using a series of methods and tests including Core observation, section comparison, clay minerals, carbon and oxygen isotopes, U and Th elements analysis.It has been shown that,the upper part of the Zhiluo formation in southern part of the study area is mainly composed of gray-green and red mudstones with lenticular red, yellow and gray-green sandstones,in northern part is mainly composed of red mudstone and gray-green sandstone, Both of the lower parts are composed of gray-white, gray-green sandstone or glutenite with thin layer of mudstone. The red sandstone is a primary sedimentary type and the gray-green sandstone is a type of post-regeneration; The interaction between oxygen containing uranium water and reducing fluid is weaker in upper part than lower part, besides, its degree of action from north to south is reduced, the northern restored altered rock coexists with primary rock, and the primary rock remains in the south; The lower part of the Zhiluo Formation is more fully modified by the fluid, and the main body is posterior altered rock. This distribution of different types of sand bodies in the Zhiluo Formation is dually affected by sedimentary facies and diagenesis, but the difference between degree is obvious, which limits the positioning of uranium mineralization enriched in lower part of the Zhiluo Formation. Therefore, the upper and lower parts should be discussed as different metallogenic systems.
keywords:lithological characteristics  sedimentary environment  sandstone type uranium  Differential Control of Uranium Mineralization  upper part of Zhiluo formation  lower part of Zhiluo formation  Tarangaole area
  查看/发表评论  下载PDF阅读器
版权所有 《地球学报》编辑部 Copyright©2008 All Rights Reserved
主管单位:中华人民共和国自然资源部 主办单位:中国地质科学院
地址: 北京市西城区百万庄大街26号,中国地质科学院东楼317室 邮编:100037 电话:010-68327396 E-mail: diqiuxb@126.com
技术支持:北京勤云科技发展有限公司
京ICP备05029128号-6

京公网安备 11010202007616号