Processed seismic data of Cruise BGR91 1991

The BGR 1991 cruise with M.V. BIN HAI 511 was designed to study the variability of the oceanic crustal structure along flow-line profiles perpendicular to the ridge axis over Early Tertiary through Cretaceous old oceanic crust of the eastern Atlantic Ocean. Seismic data with a coverage of 3,000 % were acquired along four flow-line profiles with a total length of 4,194 km, and in addition 270 km of MCS data were collected during the period from 2nd October to the 3rd November 1991. The most intriguing new observation from the seismic flow-line profiles is the discovery of two huge oceanic crustal structures characterized by an internally divergent to planar pattern of reflectors having ubiquitous seaward dip. These remarkable structures were found within an about 1,300 km long oceanic crust segment of the eastern South Atlantic located between the Bode Verde Fracture zone in the north and the Rio Grande Fracture Zone in the south. These structures resemble the prominent wedges of seaward dipping reflectors on the widespread volcanic rifted continental margins described in the literature. They are interpreted to represent voluminous build-ups of layered extrusive rocks formed during three excessive episodes of volcanism that accompanied the Cretaceous opening of the South Atlantic. These episodes of excessive volcanism/magmatism are: An episode immediate prior to, and during the first stage of seafloor spreading in the South Atlantic, i.e. during about Hauterivian through about early Aptian; an episode of inferred subaerial and/or shallow marine volcanism along the central South Atlantic spreading ridge during the Albian; and an episode of inferred subaerial and/or shallow marine volcanism along the South Atlantic spreading ridge during latest Cenomanian/earliest Turonian through early Campanian.

Identification

Data identification

Citation

Alternate title

BGR91 1991
Date (Creation)
1991-11-03
Citation identifier
9159b25b-42a2-6fbb-9c74-95abb96b64df
Status
Completed
Point of contact
  Federal Institute for Geosciences and Natural Resources
Stilleweg 2 , Hannover , 30655 ,

GEMET - INSPIRE themes, version 1.0

  • Geologie

  • geology

GEMET - Concepts, version 2.4

  • geophysics

  • Geophysik

  • raw material

  • Rohstoff
Theme

  • Marine geology

  • Meeresgeologie

  • Seismics

  • Seismik

  • Two-dimensional seismic reflection

  • zweidimensionale Reflektionsseismik
Place

  • West Africa

  • Westafrika

  • Angola Basin

  • Angola-Becken

  • Namibia

  • Südatlantik

  • South Atlantic Ocean

Legal constraints

Access constraints
Other restrictions
Other constraints
Es gelten keine Zugriffsbeschränkungen

Legal constraints

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: BGR91 1991, (c) BGR, Hannover, 1991

Spatial representation type
Vector
Language
English
Character set
UTF8
Topic category
  • Geoscientific information
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Distribution

Distribution

Distribution format
  • Shapefile ( n/a )

Digital transfer options

Transfer size
2
OnLine resource
BGR91 1991 (Shapefile)

BGR91 1991 im Format ESRI Shape

OnLine resource
Karte im BGR-Geoviewer
 

Quality

Data quality

Scope

Hierarchy level
Dataset

Conformance result

Citation

Date (Publication)
2010-12-08
Explanation

siehe dazu die angegebene Durchführungsbestimmung
Statement

During the period from the 2nd October to the 3rd November 1991 BGR acquired seismic lines off West Africa and in the Angola Basin. The lines BGR91-01, BGR91-02, BGR91-03, BGR91-04 and BGR91-06 are raw data. The lines BGR91-02A and BGR91-05 are processed (migrated) data.
 

Ref. system

Unique resource identifier
EPSG:4326
 

Metadata

Metadata

File identifier
90e51e5d-551b-4a84-900d-10ed5d90ba9f XML
Metadata language
English
Character set
UTF8
Parent identifier
Marine Seismic Survey Profiles (MSSP)

06a73c56-06a2-40d8-b806-466222b0760d
Hierarchy level
Dataset
Hierarchy level name

Geophysik
Date stamp
2023-11-14
Metadata standard name

INSPIRE Metadata Implementing Rules: Technical Guidelines based on EN ISO 19115 and EN ISO 19119
Metadata standard version

n/a
Point of contact
  Bundesanstalt für Geowissenschaften und Rohstoffe (BGR)
https://produktcenter.bgr.de
 
 

Overviews

overview

Spatial extent

N
S
E
W
thumbnail


Keywords

Marine geology Meeresgeologie Seismics Seismik Two-dimensional seismic reflection zweidimensionale Reflektionsseismik
GEMET - Concepts, version 2.4
Geophysik Rohstoff geophysics raw material
GEMET - INSPIRE themes, version 1.0
Geologie geology

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