Processed seismic data of Cruise SO85 VOKSA 1993

SONNE cruise SO-85 was designed to study the variability of the oceanic crustal structure along flow-line profiles over Early Tertiary through Early Cretaceous old crust in the Cape and Argentine basins of the South Atlantic. Between 21th February and 20th April 1993 deep imaging seismic reflection data in parallel with magnetic, gravimetric and hydroacoustic measurements have been collected along a 1,405 km long flow-line traverse across the Cape basin, and along three flow-line traverses across the Argentine basin with a total length of 4,255 km. A special geophysical survey was carried out on the Argentine continental margin. Although bad weather hampered the geophysical measurements in the Argentine basin, some new and intriguing observations were made: (1) the presence of an elongated wedge of seaward dipping reflectors, often associated with the distinct magnetic anomaly 'G', was confirmed on both, the South African and Argentine continental margins; (2) the sequence of seaward-dipping reflectors consists of two wedges. The younger wedge rests partly on the older one; (3) the surface of the oceanic crust lies more deep in the Argentine basin than in the Cape basin; (4) the structure of the oceanic crust is more variable in time and space within the Argentine and Cape basins than within the Angola and Brazil basins; (5) despite this, it appears that the oceanic crust generated during the younger half of the Cretaceous magnetic quiet period up to C 33r is characterized by relative high reflectivity in lower crustal levels; (6) high-amplitude magnetic anomalies C 33 through C 34 are apparently correlatable with oceanic crustal segments characterized by common seismic features, e.g. a smooth and scarped surface of the oceanic crust; (7) an elongated, positive gravity anomaly exists at about 58°E between 43.5°E and 47°E.

Citation proposal
. Processed seismic data of Cruise SO85 VOKSA 1993. https://gdk.gdi-de.org/geonetwork/srv/api/records/90c18a47-0d6d-48ef-a3d3-10d57f2f2a11

Simple

Alternate title: SO85 VOKSA 1993

Date ( Creation ): 1993-04-20

Identifier: ecce46ec-40c9-f743-972d-56602e6c8cfc

Status: completed Completed

Point of contact

Federal Institute for Geosciences and Natural Resources

Stilleweg 2 Hannover 30655

GEMET - INSPIRE themes, version 1.0 ( Theme )

Geologie
geology

GEMET - Concepts, version 2.4 ( Theme )

geophysics
Geophysik
raw material
Rohstoff

Keywords ( Theme )

Marine geology
Meeresgeologie
Seismics
Seismik
Two-dimensional seismic reflection
zweidimensionale Reflektionsseismik

Keywords ( Place )

South Atlantik
Cape Basin
Argentine Basin
Südatlantik
Kap-Becken
Argentinisches Becken

Access constraints: Other restrictions

Use constraints: Other restrictions

Other constraints: Allgemeine Geschäftsbedingungen, siehe http://www.bgr.bund.de/AGB - General terms and conditions, see http://www.bgr.bund.de/AGB_en. Die bereitgestellten Informationen sind bei Weiterverwendung wie folgt zu zitieren: Datenquelle: SO85 VOKSA 1993, (c) BGR, Hannover, 2018

Spatial representation type: Vector

Metadata language: English

Character set: UTF8

Topic category

Geoscientific information

Distribution format

Shapefile (n/a )

Transfer size: 2

OnLine resource: SO85 VOKSA 1993 (Shapefile)
SO85 VOKSA 1993 im Format ESRI Shape

OnLine resource: Karte im BGR-Geoviewer
Karte im BGR-Geoviewer

Hierarchy level: Dataset

Conformance result

Date ( Publication ): 2010-12-08

Explanation: siehe dazu die angegebene Durchführungsbestimmung

Statement: During the period from 21th February 1993 to 20th April 1993 BGR acquired seismic lines off the Atlantic coast of South America. The lines SO85-01A, SO85-01B, SO85-01C, SO85-01D, SO85-02A, SO85-02B, SO85-03A, SO85-03B, SO85-03C, SO85-03E, SO85-04A, SO85-04B, SO85-04C, SO85-04D and SO85-04E consist of raw data. Lines SO85-05 and SO85-06 are stacked data. Line SO85-05A consists of migrated data.