期刊
TECTONOPHYSICS
卷 599, 期 -, 页码 170-196出版社
ELSEVIER
DOI: 10.1016/j.tecto.2013.04.015
关键词
Crustal structure of Central Mozambique continental margin; Continent-ocean-boundary in the Mozambique Channel; Africa-Antarctica Corridor; Wide-angle seismic data; High-velocity-body; Gondwana breakup
资金
- BGR
- French polar institute (IPEV)
- IFREMER
- GRICES
- IDL
- AWI
- CGE
The continental margin of Mozambique formed during the initial dispersal of Gondwana about 180 Ma. Due to the lack of deep seismic and dense potential field data, many details of the timing and geometry of the early breakup in this region remained unknown to date. To close this gap, a research project (MoBaMaSis (Mozambique Basin Marine Seismic Survey) with the French research vessel RN Marion Dufresne II was conducted in 2007. This paper presents the results of P-wave, magnetic and 2D-gravity modelling along two parallel seismic refraction profiles between 37 degrees and 41 degrees E, crossing the Mozambique rifted margin. The crust shows the characteristics of normal to slightly thickened oceanic crust. A lower crustal highvelocity-body with P-wave-velocities of 7.0-7.5 km/s is observed along both profiles. Its origin is discussed in the context of upper mantle convection and thermal properties. The existing magnetic anomaly identifications have been extended to older ages. We postulate that the oldest oceanic crust near the Central Mozambique continental margin has been formed around M41n (166 Ma). Closer to the coast a pronounced negative magnetic anomaly exists that we interpret to coincide with the continent-ocean-transition. This implies that the position of the continent-ocean-transition is located significantly closer to the shoreline than proposed before. (C) 2013 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据