Paleogeomorphology and shale distribution of Late Ordovician-Early Silurian Yangtze platform, South China: Implication for shale mineralogy and TOC content
The distribution and mineral composition of the Wufeng-Longmaxi shale on the Yangtze platform are directly influenced by the geomorphology of the Late Ordovician-Early Silurian period. This research aimed to clarify the geomorphology of the Yangtze platform during this time period and its implicatio...
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| Format: | Article |
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KeAi Communications Co., Ltd.
2023-08-01
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| Series: | Journal of Natural Gas Geoscience |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2468256X23000378 |
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| author | Zhensheng Shi Yuan Yuan Qun Zhao Shasha Sun Tianqi Zhou Feng Cheng |
| author_facet | Zhensheng Shi Yuan Yuan Qun Zhao Shasha Sun Tianqi Zhou Feng Cheng |
| author_sort | Zhensheng Shi |
| collection | DOAJ |
| description | The distribution and mineral composition of the Wufeng-Longmaxi shale on the Yangtze platform are directly influenced by the geomorphology of the Late Ordovician-Early Silurian period. This research aimed to clarify the geomorphology of the Yangtze platform during this time period and its implication on the Wufeng-Longmaxi shale. Geophysical interpretation, chronostratigraphic division, and correlation, isometric map compilation, and mineral composition analysis were utilized to achieve this objective. The results of the study showed the following findings: (1) The Wufeng-Longmaxi shale was deposited on the southeastern slope of the Leshan-Longnüsi paleo-uplift on the Yangtze platform; (2) The southeastern slope exhibited three significant slope breaks, which allowed for the division of the slope into four geomorphology units: subaqueous high, subaqueous slope, subaqueous plain, and subaqueous sag; (3) The overlying Wufeng–Longmaxi shale was fully developed in the subaqueous plain and subaqueous sag, but lacked graptolite zones LM1-4 in the subaqueous high and subaqueous slope, with the shale onlapping the southeastern slope from southeast to northwest; (4) The southeastern slope significantly affects the grain size, mineral composition, and TOC content of the overlying shale. Specifically, as the slope transitioned from the subaqueous high to the subaqueous sag, the grain size becomes finer, the contents of TOC and silica increased, and the contents of carbonate and clay minerals decreased. |
| first_indexed | 2024-03-12T13:51:25Z |
| format | Article |
| id | doaj.art-dd19f81214164e018105829f1461d3d7 |
| institution | Directory Open Access Journal |
| issn | 2468-256X |
| language | English |
| last_indexed | 2024-03-12T13:51:25Z |
| publishDate | 2023-08-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Journal of Natural Gas Geoscience |
| spelling | doaj.art-dd19f81214164e018105829f1461d3d72023-08-23T04:33:45ZengKeAi Communications Co., Ltd.Journal of Natural Gas Geoscience2468-256X2023-08-0184245262Paleogeomorphology and shale distribution of Late Ordovician-Early Silurian Yangtze platform, South China: Implication for shale mineralogy and TOC contentZhensheng Shi0Yuan Yuan1Qun Zhao2Shasha Sun3Tianqi Zhou4Feng Cheng5PetroChina Research Institute of Petroleum Exploration and Development, Beijing, 100083, China; Corresponding author.PetroChina Zhejiang Oilfield Company, Hangzhou, 310023, ChinaPetroChina Research Institute of Petroleum Exploration and Development, Beijing, 100083, ChinaPetroChina Research Institute of Petroleum Exploration and Development, Beijing, 100083, ChinaPetroChina Research Institute of Petroleum Exploration and Development, Beijing, 100083, ChinaPetroChina Research Institute of Petroleum Exploration and Development, Beijing, 100083, ChinaThe distribution and mineral composition of the Wufeng-Longmaxi shale on the Yangtze platform are directly influenced by the geomorphology of the Late Ordovician-Early Silurian period. This research aimed to clarify the geomorphology of the Yangtze platform during this time period and its implication on the Wufeng-Longmaxi shale. Geophysical interpretation, chronostratigraphic division, and correlation, isometric map compilation, and mineral composition analysis were utilized to achieve this objective. The results of the study showed the following findings: (1) The Wufeng-Longmaxi shale was deposited on the southeastern slope of the Leshan-Longnüsi paleo-uplift on the Yangtze platform; (2) The southeastern slope exhibited three significant slope breaks, which allowed for the division of the slope into four geomorphology units: subaqueous high, subaqueous slope, subaqueous plain, and subaqueous sag; (3) The overlying Wufeng–Longmaxi shale was fully developed in the subaqueous plain and subaqueous sag, but lacked graptolite zones LM1-4 in the subaqueous high and subaqueous slope, with the shale onlapping the southeastern slope from southeast to northwest; (4) The southeastern slope significantly affects the grain size, mineral composition, and TOC content of the overlying shale. Specifically, as the slope transitioned from the subaqueous high to the subaqueous sag, the grain size becomes finer, the contents of TOC and silica increased, and the contents of carbonate and clay minerals decreased.http://www.sciencedirect.com/science/article/pii/S2468256X23000378PaleogeomorphologyLeshan-longnüsi paleo-upliftShaleYangtze platformWufeng FormationLongmaxi Formation |
| spellingShingle | Zhensheng Shi Yuan Yuan Qun Zhao Shasha Sun Tianqi Zhou Feng Cheng Paleogeomorphology and shale distribution of Late Ordovician-Early Silurian Yangtze platform, South China: Implication for shale mineralogy and TOC content Journal of Natural Gas Geoscience Paleogeomorphology Leshan-longnüsi paleo-uplift Shale Yangtze platform Wufeng Formation Longmaxi Formation |
| title | Paleogeomorphology and shale distribution of Late Ordovician-Early Silurian Yangtze platform, South China: Implication for shale mineralogy and TOC content |
| title_full | Paleogeomorphology and shale distribution of Late Ordovician-Early Silurian Yangtze platform, South China: Implication for shale mineralogy and TOC content |
| title_fullStr | Paleogeomorphology and shale distribution of Late Ordovician-Early Silurian Yangtze platform, South China: Implication for shale mineralogy and TOC content |
| title_full_unstemmed | Paleogeomorphology and shale distribution of Late Ordovician-Early Silurian Yangtze platform, South China: Implication for shale mineralogy and TOC content |
| title_short | Paleogeomorphology and shale distribution of Late Ordovician-Early Silurian Yangtze platform, South China: Implication for shale mineralogy and TOC content |
| title_sort | paleogeomorphology and shale distribution of late ordovician early silurian yangtze platform south china implication for shale mineralogy and toc content |
| topic | Paleogeomorphology Leshan-longnüsi paleo-uplift Shale Yangtze platform Wufeng Formation Longmaxi Formation |
| url | http://www.sciencedirect.com/science/article/pii/S2468256X23000378 |
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