Tectono‐Magmatic Processes of the Western Parece Vela Basin: Insights Derived From Seismic Imaging and Gravity Modeling
Abstract The western Parece Vela Basin (PVB) contains three distinct geomorphological zones aligned with the seafloor spreading direction: the west abyssal hill zone, the central Chaotic Terrain zone, and the east abyssal hill zone. However, the tectono‐magmatic processes responsible for the lateral...
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| Format: | Article |
| Language: | English |
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Wiley
2025-07-01
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| Series: | Geochemistry, Geophysics, Geosystems |
| Online Access: | https://doi.org/10.1029/2024GC012115 |
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| author | Changliang Chen Pin Yan Weidong Luo Yufang Tan Junhui Yu Yanlin Wang Xubo Zhang Zhanying Chen Wenkai Huang Jiale Chen |
| author_facet | Changliang Chen Pin Yan Weidong Luo Yufang Tan Junhui Yu Yanlin Wang Xubo Zhang Zhanying Chen Wenkai Huang Jiale Chen |
| author_sort | Changliang Chen |
| collection | DOAJ |
| description | Abstract The western Parece Vela Basin (PVB) contains three distinct geomorphological zones aligned with the seafloor spreading direction: the west abyssal hill zone, the central Chaotic Terrain zone, and the east abyssal hill zone. However, the tectono‐magmatic processes responsible for the lateral geomorphologic variations remain enigmatic. By processing and analyzing new multi‐channel seismic data and ship‐borne gravity data across three zones, we characterize the structures of the oceanic crust and elucidate the tectono‐magmatic processes involved in seafloor spreading. The west abyssal hill zone exhibits a wavy basement influenced by several normal faults with minor displacements, suggesting the presence of limited tectonic extension. The discontinuous seismic reflections from Moho are imaged in segments, with a crustal thickness of ∼5–7 km, indicating an abundant magma supply. The central Chaotic Terrain zone features three large‐scale seafloor domes. Strong reflectors at different depths within the domes are interpreted as sills, suggesting the presence of multi‐phase magmatic intrusions. Gravity modeling indicates that the crust at the apexes of the domes is roughly twice as thick as at the edges, showing that the domes were formed through variable magmatism. The east abyssal hill zone shows a flat basement devoid of faults, exhibits continuous sub‐horizontal Moho reflections, and predominantly consists of oceanic crust thicker than 6 km. This suggests an abundant magma supply without extension. The findings indicate a dynamic tectono‐magmatic process in the western PVB, characterized by an initial stable magma supply with limited tectonic extension, followed by fluctuations in magmatic activity, and ultimately a robust magma supply. |
| format | Article |
| id | doaj-art-c4e95c850f8e4c469d1b343c7add07f7 |
| institution | Kabale University |
| issn | 1525-2027 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geochemistry, Geophysics, Geosystems |
| spelling | doaj-art-c4e95c850f8e4c469d1b343c7add07f72025-08-20T03:34:53ZengWileyGeochemistry, Geophysics, Geosystems1525-20272025-07-01267n/an/a10.1029/2024GC012115Tectono‐Magmatic Processes of the Western Parece Vela Basin: Insights Derived From Seismic Imaging and Gravity ModelingChangliang Chen0Pin Yan1Weidong Luo2Yufang Tan3Junhui Yu4Yanlin Wang5Xubo Zhang6Zhanying Chen7Wenkai Huang8Jiale Chen9State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou ChinaState Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou ChinaGuangzhou Marine Geological Survey Ministry of Natural Resources Guangzhou ChinaGuangzhou Marine Geological Survey Ministry of Natural Resources Guangzhou ChinaState Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou ChinaState Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou ChinaState Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou ChinaState Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou ChinaGuangzhou Marine Geological Survey Ministry of Natural Resources Guangzhou ChinaGuangzhou Marine Geological Survey Ministry of Natural Resources Guangzhou ChinaAbstract The western Parece Vela Basin (PVB) contains three distinct geomorphological zones aligned with the seafloor spreading direction: the west abyssal hill zone, the central Chaotic Terrain zone, and the east abyssal hill zone. However, the tectono‐magmatic processes responsible for the lateral geomorphologic variations remain enigmatic. By processing and analyzing new multi‐channel seismic data and ship‐borne gravity data across three zones, we characterize the structures of the oceanic crust and elucidate the tectono‐magmatic processes involved in seafloor spreading. The west abyssal hill zone exhibits a wavy basement influenced by several normal faults with minor displacements, suggesting the presence of limited tectonic extension. The discontinuous seismic reflections from Moho are imaged in segments, with a crustal thickness of ∼5–7 km, indicating an abundant magma supply. The central Chaotic Terrain zone features three large‐scale seafloor domes. Strong reflectors at different depths within the domes are interpreted as sills, suggesting the presence of multi‐phase magmatic intrusions. Gravity modeling indicates that the crust at the apexes of the domes is roughly twice as thick as at the edges, showing that the domes were formed through variable magmatism. The east abyssal hill zone shows a flat basement devoid of faults, exhibits continuous sub‐horizontal Moho reflections, and predominantly consists of oceanic crust thicker than 6 km. This suggests an abundant magma supply without extension. The findings indicate a dynamic tectono‐magmatic process in the western PVB, characterized by an initial stable magma supply with limited tectonic extension, followed by fluctuations in magmatic activity, and ultimately a robust magma supply.https://doi.org/10.1029/2024GC012115 |
| spellingShingle | Changliang Chen Pin Yan Weidong Luo Yufang Tan Junhui Yu Yanlin Wang Xubo Zhang Zhanying Chen Wenkai Huang Jiale Chen Tectono‐Magmatic Processes of the Western Parece Vela Basin: Insights Derived From Seismic Imaging and Gravity Modeling Geochemistry, Geophysics, Geosystems |
| title | Tectono‐Magmatic Processes of the Western Parece Vela Basin: Insights Derived From Seismic Imaging and Gravity Modeling |
| title_full | Tectono‐Magmatic Processes of the Western Parece Vela Basin: Insights Derived From Seismic Imaging and Gravity Modeling |
| title_fullStr | Tectono‐Magmatic Processes of the Western Parece Vela Basin: Insights Derived From Seismic Imaging and Gravity Modeling |
| title_full_unstemmed | Tectono‐Magmatic Processes of the Western Parece Vela Basin: Insights Derived From Seismic Imaging and Gravity Modeling |
| title_short | Tectono‐Magmatic Processes of the Western Parece Vela Basin: Insights Derived From Seismic Imaging and Gravity Modeling |
| title_sort | tectono magmatic processes of the western parece vela basin insights derived from seismic imaging and gravity modeling |
| url | https://doi.org/10.1029/2024GC012115 |
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