New Insights Into the Rift-To-Drift Process of the Northern South China Sea Margin Constrained by a Three-Dimensional Wide-Angle Seismic Velocity Model
21 pages, 10 figures, supporting information https://doi.org/10.1029/2022JB026171.-- Data Availability Statement: The raw data used for P-wave travel-time tomographic inversion in this study is available at Science Data Bank via https://www.scidb.cn/anonymous/ckVyTVpm with CC0 (Zhang J., Zhao, M., & Qiu X., 2022)
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American Geophysical Union
2023-04
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dig-icm-es-10261-3305182023-07-05T10:28:36Z New Insights Into the Rift-To-Drift Process of the Northern South China Sea Margin Constrained by a Three-Dimensional Wide-Angle Seismic Velocity Model Zhang, Jiazheng Zhao, Minghui Ding, Weiwei Ranero, César R. Sallarès, Valentí Gao, Jinwei Zhang, Cuimei Qiu, Xuelin National Natural Science Foundation of China Agencia Estatal de Investigación (España) 21 pages, 10 figures, supporting information https://doi.org/10.1029/2022JB026171.-- Data Availability Statement: The raw data used for P-wave travel-time tomographic inversion in this study is available at Science Data Bank via https://www.scidb.cn/anonymous/ckVyTVpm with CC0 (Zhang J., Zhao, M., & Qiu X., 2022) A three-dimensional (3D) P-wave seismic velocity (Vp) model of the crust in the northern South China Sea margin drilled by IODP Expeditions 367/368/368X has been obtained with first-arrival travel-time tomography using wide-angle seismic data from a network of 49 OBSs and 11 air-gun shot lines. The 3D Vp distribution constrains the extent, structure and nature of the continental, continent to ocean transition (COT), and oceanic domains. Continental crust laterally ranges in thickness from ∼8 to 20 km, a ∼20 km-width COT contains no evidence of exhumed mantle, and crust with clear oceanic seismic structure ranges in thickness from ∼4.5 to 9 km. A high-velocity (7.0–7.5 km/s) lower crust (HVLC) ranges in thickness from ∼1 to 9 km across the continental and COT domains, which is interpreted as a proxy of syn-rift and syn-breakup magma associated to underplating and/or intrusions. Continental crust thinning style is abrupter in the NE segment and gradual in the SW segment. Abrupter continental thinning exhibits thicker HVLC at stretching factor (β) < ∼3, whereas gentler thinning associates to thinner HVLC at β > ∼4. Opening of the NE segment thus occurred by comparatively increased magmatism, whereas tectonic extension was more important in the SW segment. The Vp distribution shows the changes in deformation and magmatism are abrupt along the strike of the margin, with the segments possibly bounded by a transfer fault system. No conventional model explains the structure and segmentation of tectonic and magmatic processes. Local inherited lithospheric heterogeneities during rifting may have modulated the contrasting opening styles This work was financially supported by National Natural Science Foundation of China (Grants 41730532, 91958212, and U20A20100) With the institutional support of the ‘Severo Ochoa Centre of Excellence’ accreditation (CEX2019-000928-S) Peer reviewed 2023-07-05T10:28:36Z 2023-07-05T10:28:36Z 2023-04 artículo Journal of Geophysical Research - Part B - Solid Earth 128(4): e2022JB026171 (2023) 2169-9356 CEX2019-000928-S http://hdl.handle.net/10261/330518 10.1029/2022JB026171 2169-9313 en Publisher's version https://doi.org/10.1029/2022JB026171 Sí open American Geophysical Union |
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21 pages, 10 figures, supporting information https://doi.org/10.1029/2022JB026171.-- Data Availability Statement: The raw data used for P-wave travel-time tomographic inversion in this study is available at Science Data Bank via https://www.scidb.cn/anonymous/ckVyTVpm with CC0 (Zhang J., Zhao, M., & Qiu X., 2022) |
| author2 |
National Natural Science Foundation of China |
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National Natural Science Foundation of China Zhang, Jiazheng Zhao, Minghui Ding, Weiwei Ranero, César R. Sallarès, Valentí Gao, Jinwei Zhang, Cuimei Qiu, Xuelin |
| format |
artículo |
| author |
Zhang, Jiazheng Zhao, Minghui Ding, Weiwei Ranero, César R. Sallarès, Valentí Gao, Jinwei Zhang, Cuimei Qiu, Xuelin |
| spellingShingle |
Zhang, Jiazheng Zhao, Minghui Ding, Weiwei Ranero, César R. Sallarès, Valentí Gao, Jinwei Zhang, Cuimei Qiu, Xuelin New Insights Into the Rift-To-Drift Process of the Northern South China Sea Margin Constrained by a Three-Dimensional Wide-Angle Seismic Velocity Model |
| author_sort |
Zhang, Jiazheng |
| title |
New Insights Into the Rift-To-Drift Process of the Northern South China Sea Margin Constrained by a Three-Dimensional Wide-Angle Seismic Velocity Model |
| title_short |
New Insights Into the Rift-To-Drift Process of the Northern South China Sea Margin Constrained by a Three-Dimensional Wide-Angle Seismic Velocity Model |
| title_full |
New Insights Into the Rift-To-Drift Process of the Northern South China Sea Margin Constrained by a Three-Dimensional Wide-Angle Seismic Velocity Model |
| title_fullStr |
New Insights Into the Rift-To-Drift Process of the Northern South China Sea Margin Constrained by a Three-Dimensional Wide-Angle Seismic Velocity Model |
| title_full_unstemmed |
New Insights Into the Rift-To-Drift Process of the Northern South China Sea Margin Constrained by a Three-Dimensional Wide-Angle Seismic Velocity Model |
| title_sort |
new insights into the rift-to-drift process of the northern south china sea margin constrained by a three-dimensional wide-angle seismic velocity model |
| publisher |
American Geophysical Union |
| publishDate |
2023-04 |
| url |
http://hdl.handle.net/10261/330518 |
| work_keys_str_mv |
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