| 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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| 关键词:eastern margin of Ordos Basin Jinxi flexure fold belt Ordovician Majiagou Formation marine potash structural forming of potassium depression in ancient and upheaval in present |
| 基金项目:国家重点研发计划课题“重点含钾盆地富钾规律、战略选区与深部探测技术示范”(编号: 2017YFC0602806);国家自然科学基金“鄂尔多斯盆地东缘奥陶纪构造特征及其对成钾凹陷的控制”(编号: 41702214);中国地质调查局地质调查二级项目“陕东-晋西地区气钾兼探战略调查”(编号: DD20179624);“西部地区钾盐矿产远景调查评价”(编号: DD20160054) |
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| 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 |
| 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. |
| GUI Baoling,ZHANG Yongsheng,XING Enyuan,PENG Yuan,CHEN Tianyu,MAO Yahui,ZHANG Wenjun,ZHAO Haitong,JIANG Suyang.2024.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[J].Acta Geoscientica Sinica,45(5):678-690. |
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