The Lower Shire Karoo Basin architecture using 3-D gravity inversion modelling
文献类型：期刊论文
| 作者 | Manda, Brave4,5; Yan, Jianguo3,5; Dulanya, Zuze2; Chisenga, Chikondi1,5 |
| 刊名 | JOURNAL OF AFRICAN EARTH SCIENCES
 |
| 出版日期 | 2026-06-01 |
| 卷号 | 238页码:19 |
| 关键词 | 3D gravity inversion Density anomaly Gravity anomaly Density structures Magmatism |
| ISSN号 | 1464-343X |
| DOI | 10.1016/j.jafrearsci.2026.106075 |
| 通讯作者 | Yan, Jianguo(jgyan@whu.edu.cn) |
| 英文摘要 | We studied the Ngabu sub-basin to determine its three-dimensional (3-D) structure and geometry using a depthweighted gravity inversion approach. The Ngabu sub-basin is part of the Shire Graben within the Western Branch of the East African Rift System, located in southern Malawi, southeastern Africa. This region has been identified as a potential hydrocarbon exploration area due to its rifting history and tectonic evolution. The objectives of this study are to (1) develop three-dimensional density structures, (2) characterize the basin architecture and geometry, and (3) constrain the depth. The resolved 3-D density structures reveal that the Ngabu sub-basin depocenter extends to approximately 4 km in depth. It is separated from the Mwabvi sub-basin by a highdensity structure, likely linked to magmatic activity associated with the formation of the Chikwawa Basalts. The Nyamalambo and Nkombedzi faults appear near the edges of the airborne gravity data coverage, while the Mwanza and Thyolo faults are interpreted to extend to depths of similar to 4 km. These major faults significantly influence sediment distribution and the landscape within the Shire Rift Valley. Despite data limitations affecting the full resolution of the Lengwe and Mwabvi sub-basins, low-density anomalies suggest that the Lengwe and Ngabu sub-basins are the largest and trend NW-SE, while the Mwabvi sub-basin is smaller and structurally distinct. The low-density structures also suggest the presence of a possible Karoo outlier related to the Ngabu subbasin, which may have originally formed as part of a unified basin before being segmented by magmatic activity during Middle Jurassic-Cretaceous magma-rich rifting. The methodological approach utilized in this study can be applied in other sedimentary environments in the Western Branch of the East African Rift System to understand the Karoo basin architecture, sedimentary thickness, and geometry. |
| WOS关键词 | AFRICAN RIFT SYSTEM ; MALAWI RIFT ; TECTONIC EVOLUTION ; CRUSTAL STRUCTURE ; MOZAMBIQUE BELT ; SOUTHERN MALAWI ; PROVINCE ; HISTORY ; VALLEY ; SUPERGROUP |
| 资助项目 | National Scientific Foundation of China[42241116] ; National Key Research and Development Program of China[2022YFF0503202] ; Project of Xinjiang Uygur Autonomous Region of China for the Heaven Lake Talent Program and Macau University of Science and Technology[SKL-LPS (MUST)-2021-2023] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001696260300001 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 资助机构 | National Scientific Foundation of China ; National Key Research and Development Program of China ; Project of Xinjiang Uygur Autonomous Region of China for the Heaven Lake Talent Program and Macau University of Science and Technology |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/8590]  |
| 专题 | 研究单元未命名 |
| 通讯作者 | Yan, Jianguo |
| 作者单位 | 1.Malawi Univ Sci & Technol, Ndata Sch Climate & Earth Sci, Dept Earth Sci, POB 5196, Limbe, Malawi 2.Univ Malawi, Sch Nat & Appl Sci, Dept Geog Earth Sci & Environm, POB 280, Zomba, Malawi 3.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 4.Minist Energy & Min, Geol Survey Dept, POB 27, Zomba, Malawi 5.Wuhan Univ, State Key Lab Informat Engn Surveying Mapping & Re, Box 129, Luoyu Rd, Wuhan, Peoples R China |
| 推荐引用方式 GB/T 7714 | Manda, Brave,Yan, Jianguo,Dulanya, Zuze,et al. The Lower Shire Karoo Basin architecture using 3-D gravity inversion modelling[J]. JOURNAL OF AFRICAN EARTH SCIENCES,2026,238:19. |
| APA | Manda, Brave,Yan, Jianguo,Dulanya, Zuze,&Chisenga, Chikondi.(2026).The Lower Shire Karoo Basin architecture using 3-D gravity inversion modelling.JOURNAL OF AFRICAN EARTH SCIENCES,238,19. |
| MLA | Manda, Brave,et al."The Lower Shire Karoo Basin architecture using 3-D gravity inversion modelling".JOURNAL OF AFRICAN EARTH SCIENCES 238(2026):19. |
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来源：新疆天文台
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