气候变化领域集成服务门户(CCPortal): Deep Structure of the North Natal Valley (Mozambique) Using Combined Wide-Angle and Reflection Seismic Data

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DOI	10.1029/2020JB021171
	Deep Structure of the North Natal Valley (Mozambique) Using Combined Wide-Angle and Reflection Seismic Data
	Leprêtre A.; Schnürle P.; Evain M.; Verrier F.; Moorcroft D.; de Clarens P.; Corela C.; Afilhado A.; Loureiro A.; Leroy S.; d'Acremont E.; Thompson J.; Aslanian D.; Moulin M.
发表日期	2021
ISSN	21699313
卷号	126 期号:4
英文摘要	The North Natal Valley (NNV) and the Mozambique Coastal Plain (MCP) are key areas for the understanding of the SW Indian Ocean history since the Gondwana break-up. Nevertheless, the deep structures and the nature of the NNV and MCP remain discussed in the absence of deep geophysical data. In 2016, the NNV, MCP and Limpopo margin (LM) have been investigated along seven wide-angle and MCS profiles. The combined wide-angle and reflection seismic interpretation along the N-S MZ7 profile reveals an upper sedimentary sequence characterized by low velocities generally not exceeding 3 km/s, with thicknesses varying from 0.150 km in the central part to ∼2.8 km in the south. The underlying sequence is formed of a 2.53.0 km thick volcano-sedimentary sequence which presents important lateral and with depth changes and presence of high velocity lenses, indicating inter-bedded volcanic sills and recurrent magmatic episodes. The south of the NNV including the Naude Ridge (NR) presents a disturbed sedimentary cover with structural highs and southward-dipping reflectors and sub-basins. The crust, reaching 35–40 km onshore below the MCP, gently thins below the continental shelf to a regular thickness of ∼29 km below the NNV. Crustal velocities reveal low velocity gradients, with atypical high velocities. South the ND, the crust thins to 15 km. We interpret the velocity architecture combined with the evidences of volcanism at shallower depths as indicating an intensively intruded continental crust. Contrary to what is proposed in most geodynamic models, the Mozambique Coastal plain and the Natal Valley are both of continental nature, with an abrupt necking zone located south of NR. The Antarctica plate was therefore situated at the eastern limit of these two domains before the Gondwana breakup. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Continental crust; Mozambique; Natal Valley; passive margin; wide-angle seismic
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187253
作者单位	IFREMER, REM/GM/LGS, Centre de Brest, Plouzané, France; LGO, IUEM, Plouzané, France; Nelson Mandela Metropolitan University, Port Elisabeth, South Africa; TOTAL, R&D, Pau, France; IDL – Instituto Dom Luis, Lisboa, Faculdade das Ciencias da Universidade de Lisboa, Lisboa, Portugal; ISEL – Instituto Superior de Engenharia de Lisboa, Lisboa, Portugal; Sorbonne Universite, CNRS, Institut des Sciences de la Terre de Paris, Paris, France
推荐引用方式 GB/T 7714	Leprêtre A.,Schnürle P.,Evain M.,et al. Deep Structure of the North Natal Valley (Mozambique) Using Combined Wide-Angle and Reflection Seismic Data[J],2021,126(4).
APA	Leprêtre A..,Schnürle P..,Evain M..,Verrier F..,Moorcroft D..,...&Moulin M..(2021).Deep Structure of the North Natal Valley (Mozambique) Using Combined Wide-Angle and Reflection Seismic Data.Journal of Geophysical Research: Solid Earth,126(4).
MLA	Leprêtre A.,et al."Deep Structure of the North Natal Valley (Mozambique) Using Combined Wide-Angle and Reflection Seismic Data".Journal of Geophysical Research: Solid Earth 126.4(2021).