| 鄂尔多斯盆地中—晚侏罗世构造事件的沉积响应 |
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| 关键词:Ordos basin sedimentary record Middle–Late Jurassic Qm-F-Lt diagram micritic carbonat |
| 基金项目:国家自然科学基金项目(编号: 41372122); 国家专项“深部探测技术与实验研究”(编号: SinoProbe-08-01); 中国地质调查局地质调查项目(编号: 1212011121095) |
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| Sedimentary Response to Middle–Late Jurassic Tectonic Events in the Ordos Basin |
| The Jurassic era was an important period of tectonic evolution in the East Asia continent. The boundary structural belts around the Ordos Basin have recorded multi-directional compressions during the Middle to Late Jurassic period, which was dynamically associated with distant field effects that resulted from synchronous convergences of different plates (Siberia, Paleo-Pacific and Tethys) toward the East Asia continent. The generation and development of Middle–Late Jurassic tectonic events were recorded by the Jurassic sedimentation in the Ordos Basin: (1) The Jurassic sedimentary sequence from the Lower Jurassic Fuxian Formation to the Upper Jurassic Fenfanghe Formation represents a complete sedimentary cycle from the lacustrine transgression to the lacustrine regression, and the sedimentary facies include fluvial facies (Fuxian Formation), lacustrine-swampy facies (Yanan Formation), fluvial-deltaic facies (Zhiluo Formation and Anding Formation) and alluvial fan (Fengfanghe Formation). Among these facies, the Middle Jurassic Zhiluo Formation basal conglomerates mark the key period of transition from the lacustrine transgression to the lacustrine regression; (2) In the Qm-F-Lt diagram, the sandstone projection points of Yan’an Formation and Zhiluo Formation fall into the stable craton interior and quartzose recycle, respectively, which indicates that the tectonic activity increased quickly during Zhiluo Formation; (3) A set of regional contrast stable micritic carbonates was developed in the middle Jurassic Anding Formation, the stratigraphic color near the micritic carbonate changes from grayish green into purple, and the paleosalinity increases suddenly, which indicates that the ancient climate changed suddenly and the tectonic activity was enhanced quickly. (4) The Middle–Late Jurassic tectonic events initially occurred at about 168 Ma and their intensive activities took place at about 161 Ma, as evidenced by the tectonic thermal events developed in the basin and detrital zircon age spectrum obtained in the neighboring areas. |
| LI Zhen-hong,DONG Shu-wen,FENG Sheng-bin,QU Hong-jie.2015.Sedimentary Response to Middle–Late Jurassic Tectonic Events in the Ordos Basin[J].Acta Geoscientica Sinica,36(1):22-30. |
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