NDLI: Deep Crustal Structure of the Continental Margin off the Explora Escarpment and in the Lazarev Sea, East Antarctica

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Input of Glaciomarine Sediments along the East Antarctic Continental Margin; Depositional Processes on the Cosmonaut Sea Continental Slope and Rise and a Regional Acoustic Stratigraphic Correlation from 40° W to 80° E

Improved Seismic Stratigraphy of the Mesozoic Weddell Sea

Deep Crustal Structure of the Continental Margin off the Explora Escarpment and in the Lazarev Sea, East Antarctica

The Agulhas Ridge, South Atlantic: The Peculiar Structure of a Fracture Zone

Marine Geophysical Researches : Volume 25, Issue 1-2, March 2004

Marine Geophysical Researches : Volume 24

Marine Geophysical Researches : Volume 23

Marine Geophysical Researches : Volume 22

Marine Geophysical Researches : Volume 21

Marine Geophysical Researches : Volume 20

Marine Geophysical Researches : Volume 19

Deep Crustal Structure of the Continental Margin off the Explora Escarpment and in the Lazarev Sea, East Antarctica

Content Provider	Springer Nature Link
Author	Jokat, Wilfried Ritzmann, Oliver Reichert, Christian Hinz, Karl
Copyright Year	2005
Abstract	This study presents the results of a seismic refraction experiment that was carried out off Dronning Maud Land (East Antarctica) along the Explora Escarpment (14° W–12° W) and close to Astrid Ridge (6°E). Oceanic crust of about 10 km thickness is observed northwest of the Explora Escarpment. Stretched continental crust, observed southeast of the escarpment, is most likely intruded by volcanic material at all crustal levels. Seismic velocities of 7.0–7.4 km/s are modelled for the lower crust. The northern boundary of this high velocity body coincides approximately with the Explora Escarpment. The upper crystalline crust is overlain by a 4-km thick and 70-km wide wedge of volcanic material: the Explora Wedge. Seismic velocities for the oceanic crust north of the Explora Escarpment are in good agreement with global studies. The oceanic crust in the region of the Lazarev Sea is also up to 10-km thick. The lower crystalline crust shows seismic velocities of up to 7.4 km/s. This, together with the larger crustal thickness might point to higher mantle temperatures during the formation of the oceanic crust. The more southerly rifted continental crust is up to 25-km thick, and also has seismic velocities of 7.4 km/s in the lower crystalline crust. This section is interpreted to consist of stretched continental crust, which is heavily intruded by volcanic material up to approximately 8-km depth. Multichannel seismic data indicate that, in this region, two volcanic wedges are present. The wedges are interpreted to have evolved during different time/rift periods. The wedges have a total width of at least 180 km in the Lazarev Sea. Our results support previous findings that the continental margin off Dronning Maud Land between ≈2°E and ≈13°E had a complex and long-lived rift history. Both continental margins can be classified as rifted volcanic continental margins that were formed during break-up of Gondwana.
Starting Page	283
Ending Page	304
Page Count	22
File Format	PDF
ISSN	00253235
Journal	Marine Geophysical Researches
Volume Number	25
Issue Number	3-4
e-ISSN	15730581
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-09-24
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Rifted continent margin Weddell Sea Antarctica seismic reflection data seismic refraction data continent–ocean transition Gondwana Geosciences Geophysics/Geodesy Oceanography Offshore Engineering
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics Oceanography

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