鄂尔多斯盆地东缘奥陶纪马家沟期边界断层的新认识及其对成钾凹陷的控制

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中文摘要：鄂尔多斯盆地陕北盐盆奥陶系马家沟组具备良好的成钾潜力,然而,当前仅勘探到薄钾石盐矿层和厚层钾石盐矿化段,大规模钾盐矿尚未发现.通过分析鄂尔多斯盆地东缘地震剖面的构造特征,认为盆地东缘晋西挠褶带西部马五6亚段沉积期存在活动边界正断层.在该断层作用下,形成东断西超的活动同沉积凹陷,富钾卤水大量汇聚于此.在持续干旱的强蒸发环境下,卤水持续浓缩,成钾窗口出现,钾石盐大规模析出,进而形成整装海相优质固体钾石盐矿床.侏罗纪末期,挤压应力导致成钾凹陷抬升,形成古凹今隆的格局,钾盐层抬升至较浅部位,有利于水溶法经济开采.

外文标题：New Understanding of Boundary Fault Control of Potassium Sag Formation in the Majiagou Period of the Ordovician in the Eastern Margin of the Ordos Basin

外文摘要：The Ordovician Majiagou Formation in the northern Shaanxi salt basin has good potential for potassium mineral formation,but only thin potassium beds and thick beds of potassium mineralization,rather than large-scale potash,have been found.As a result of performing a structure analysis of seismic profiles in the eastern margin of the Ordos Basin,we believe that there was a boudary normal fault in the period of deposition of the sixth submember of the Majiagou Formation in the Jinxi flexure fold belt.The boudary normal fault formed a syndepositional depression,and a large amount of brine rich in potassium accumulated within the sag.With continuing drought,strong evaporation,and continuous enrichment,a brine potassium window appeared,and large-scale sylvine separated out,forming a monoblock of high-quality,marine,solid potassium salt deposits.During the Mesozoic Era,compressional stress caused the potassium sag to rise,forming a pattern of ancient depression and subsequent uplift.The potassium salt beds were uplifted to the shallow part of the basin,which is convenient for economic exploitation by the water solution method.

外文关键词：

eastern margin of Ordos BasinJinxi flexure fold beltOrdovician Majiagou Formationmarine potashstructural forming of potassiumdepression in ancient and upheaval in present

作者：

桂宝玲、张永生、邢恩袁、彭渊、陈天宇、毛亚辉、张文君、赵海彤、蒋苏扬

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作者单位：

中国地质科学院矿产资源研究所自然资源部盐湖资源与环境重点实验室,北京 100037

中国地质科学院矿产资源研究所自然资源部成矿作用与资源评价重点实验室,北京 100037

中国地质科学院自然资源部深地科学与探测技术实验室,北京 100037

中国石油长庆油田分公司第二采气厂,陕西榆林 719000

中国石油长庆油田分公司油气工艺研究院,陕西西安 710018

中国石油华北油田分公司勘探开发研究院,河北任丘 062552

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关键词：

鄂尔多斯盆地东缘晋西挠褶带奥陶系马家沟组海相钾盐构造成钾古凹今隆

基金：

国家重点研发计划课题国家自然科学基金中国地质调查局地质调查二级项目&&

项目编号：

2017YFC060280641702214DD20179624DD20160054

出版年：

2024

DOI：

10.3975/cagsb.2024.080801

地球学报

中国地质科学院

地球学报

CSTPCD北大核心

影响因子：1.797

ISSN：1006-3021

年,卷(期)：2024.45(5)