The Characteristics of Lithofacies and Depositional Model of Fine-Grained Sedimentary Rocks in the Ordos Basin, China
In order to clarify the characteristics of fine-grained sedimentary lithofacies and the depositional models in lacustrine environments of the Chang 7 Member of the Upper Triassic Yanchang Formation in the Ordos Basin, we focus on the lacustrine lithofacies classification and controlling factors. Bas...
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MDPI AG
2023-03-01
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| author | Zhenhong Chen Xincheng Li Hao Chen Zhennan Duan Zhen Qiu Xiaoqian Zhou Yuguang Hou |
| author_facet | Zhenhong Chen Xincheng Li Hao Chen Zhennan Duan Zhen Qiu Xiaoqian Zhou Yuguang Hou |
| author_sort | Zhenhong Chen |
| collection | DOAJ |
| description | In order to clarify the characteristics of fine-grained sedimentary lithofacies and the depositional models in lacustrine environments of the Chang 7 Member of the Upper Triassic Yanchang Formation in the Ordos Basin, we focus on the lacustrine lithofacies classification and controlling factors. Based on the typical field sections of the southern Ordos Basin, combined with the methods of organic geochemical analysis, polarizing microscopic observation, XRD and elemental geochemistry, we summarize the main controlling factors of the lithofacies under different sedimentary environments and establish the sedimentary model under different sedimentary backgrounds. Results show that the Chang 7 Member of the Ordos Basin includes six major lithofacies types, i.e., quasi-laminated clayey shale facies, blocky silty mudstone facies, quasi-laminated silty shale facies, laminated silty shale facies, blocky mixed mudstone facies, and laminated argillaceous siltstone facies. Al<sub>2</sub>O<sub>3</sub>, MgO, CaO, Na<sub>2</sub>O, K<sub>2</sub>O, and SiO<sub>2</sub> are relatively depleted, while TiO<sub>2</sub>, TFe<sub>2</sub>O<sub>3</sub>, and P<sub>2</sub>O<sub>5</sub> are relatively enriched in the Chang 7<sub>2+3</sub>. Meanwhile, the trace elements are relatively enriched in Cd, Cu, Mo, U, and V. The fine-grained sedimentary facies were influenced by various sedimentary environments, such as paleoclimate, redox conditions, productivity and terrigenous input. According to lithofacies types and genetic mechanisms of the Chang 7 Member in the study area, two types of lithofacies assemblages are identified. The rapid rise in lake level during the deposition of the Chang 7<sub>2+3</sub> resulted in an anoxic water column, high productivity, and low terrigenous input under a humid climate and weak-to-moderate weathering conditions. Therefore, clayey shale lithofacies assemblage is developed in the lower Chang 7 Member. |
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| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-11T07:25:55Z |
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| spelling | doaj.art-d97062fd875f4f9fbdd25d9e8515a4c42023-11-17T07:37:59ZengMDPI AGEnergies1996-10732023-03-01165239010.3390/en16052390The Characteristics of Lithofacies and Depositional Model of Fine-Grained Sedimentary Rocks in the Ordos Basin, ChinaZhenhong Chen0Xincheng Li1Hao Chen2Zhennan Duan3Zhen Qiu4Xiaoqian Zhou5Yuguang Hou6PetroChina Exploration and Development Research Institute, Beijing 100083, ChinaKey Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, ChinaPetroChina Exploration and Development Research Institute, Beijing 100083, ChinaSINOPEC Gudong Geological Research Institute, Dongying 257000, ChinaPetroChina Exploration and Development Research Institute, Beijing 100083, ChinaKey Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, ChinaKey Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, ChinaIn order to clarify the characteristics of fine-grained sedimentary lithofacies and the depositional models in lacustrine environments of the Chang 7 Member of the Upper Triassic Yanchang Formation in the Ordos Basin, we focus on the lacustrine lithofacies classification and controlling factors. Based on the typical field sections of the southern Ordos Basin, combined with the methods of organic geochemical analysis, polarizing microscopic observation, XRD and elemental geochemistry, we summarize the main controlling factors of the lithofacies under different sedimentary environments and establish the sedimentary model under different sedimentary backgrounds. Results show that the Chang 7 Member of the Ordos Basin includes six major lithofacies types, i.e., quasi-laminated clayey shale facies, blocky silty mudstone facies, quasi-laminated silty shale facies, laminated silty shale facies, blocky mixed mudstone facies, and laminated argillaceous siltstone facies. Al<sub>2</sub>O<sub>3</sub>, MgO, CaO, Na<sub>2</sub>O, K<sub>2</sub>O, and SiO<sub>2</sub> are relatively depleted, while TiO<sub>2</sub>, TFe<sub>2</sub>O<sub>3</sub>, and P<sub>2</sub>O<sub>5</sub> are relatively enriched in the Chang 7<sub>2+3</sub>. Meanwhile, the trace elements are relatively enriched in Cd, Cu, Mo, U, and V. The fine-grained sedimentary facies were influenced by various sedimentary environments, such as paleoclimate, redox conditions, productivity and terrigenous input. According to lithofacies types and genetic mechanisms of the Chang 7 Member in the study area, two types of lithofacies assemblages are identified. The rapid rise in lake level during the deposition of the Chang 7<sub>2+3</sub> resulted in an anoxic water column, high productivity, and low terrigenous input under a humid climate and weak-to-moderate weathering conditions. Therefore, clayey shale lithofacies assemblage is developed in the lower Chang 7 Member.https://www.mdpi.com/1996-1073/16/5/2390lithofaciessedimentary modelelemental geochemistryYanchang FormationOrdos Basin |
| spellingShingle | Zhenhong Chen Xincheng Li Hao Chen Zhennan Duan Zhen Qiu Xiaoqian Zhou Yuguang Hou The Characteristics of Lithofacies and Depositional Model of Fine-Grained Sedimentary Rocks in the Ordos Basin, China Energies lithofacies sedimentary model elemental geochemistry Yanchang Formation Ordos Basin |
| title | The Characteristics of Lithofacies and Depositional Model of Fine-Grained Sedimentary Rocks in the Ordos Basin, China |
| title_full | The Characteristics of Lithofacies and Depositional Model of Fine-Grained Sedimentary Rocks in the Ordos Basin, China |
| title_fullStr | The Characteristics of Lithofacies and Depositional Model of Fine-Grained Sedimentary Rocks in the Ordos Basin, China |
| title_full_unstemmed | The Characteristics of Lithofacies and Depositional Model of Fine-Grained Sedimentary Rocks in the Ordos Basin, China |
| title_short | The Characteristics of Lithofacies and Depositional Model of Fine-Grained Sedimentary Rocks in the Ordos Basin, China |
| title_sort | characteristics of lithofacies and depositional model of fine grained sedimentary rocks in the ordos basin china |
| topic | lithofacies sedimentary model elemental geochemistry Yanchang Formation Ordos Basin |
| url | https://www.mdpi.com/1996-1073/16/5/2390 |
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