Processed seismic data of Cruise BGR97

The 3rd cooperative BGR/SMNG Arctic cruise was designed to acquire new scietific data for a better understanding of temporal and spatial lithospheric variations during rifting and its influence on the tectonic and structural evolution of the continental crust of the Laptev Sea undergoing extension since at least the Early Tertiary, and for tackling open questions regarding the evolution of the submarine permafrost zone. Although conditions for seismic measurements were worse in 1997 than in 1993 and 1994, along 4,622 km of seismic traverses reflection seismic data and wide angle reflection/refraction data from 23 OBH-(ocean bottom hydrophone) stations were collected in the Laptev and East Siberian Sea. The most prominent rift basin is the Ust' Lena Rift, which is at least 300 km wide at latitude 75°N. The Cenozoic sedimentary cover exceeds 3 km everywhere, increasing up to 14 km at two locations. In the northern part of the shelf, the complex mainly N–S-trending Anisin Basin has a basin fill of up to 10 km thickness. The New Siberian Basin which is located in the northwestern part of the study area shows an up to 9 km thick graben fill. The Laptev Horst crust is locally subdivided into several tilted blocks by deep-reaching faults and there are several half grabens of smaller extent which divide the Laptev Horst into three parts: the North, the South and the East Laptev Horst. A major west dipping listric fault of at least 250 km length separates the Laptev Horst from the Ust' Lena Rift. Results from the seismological investigation indicate that recent extension is concentrated within the narrow rift basins of the eastern Laptev Sea. From wide-angle reflection/refraction seismic measurements the seismic velocities of the crustal layers were estimated along five profiles. The layers with velocities of up to 3.5 km/s apparently consist of predominantly Cenozoic sediments. The sedimentary section showing relatively high seismic velocities of 4.5 to 5.2 km/s might be interpreted as Late Paleozoic to Mesozoic deposits or overcompacted/cemented syn-rift deposits. In the eastern shelf area a layer beneath the acoustic basement was interpreted to represent Ordovician to Early Mesozoic carbonates. The lower crust in the area under study shows relatively uniform seismic velocities of about 6.0-6.8 km/s and the velocities estimated for the crust-mantle transition are in the range of 8.0 to 8.2 km/s. The origin of a several 100 m thick layer with a relative high velocity of 3 to 3.5 km/s directly beneath the seafloor was inferred as sub-sea permafrost.

Citation proposal
. Processed seismic data of Cruise BGR97. https://gdk.gdi-de.org/geonetwork/srv/api/records/66c1d069-4e65-4f37-aef8-a42948d9edf7

INSPIRE
SDS

INSPIRE

Identification

File identifier: 66c1d069-4e65-4f37-aef8-a42948d9edf7 XML

Hierarchy level: Dataset

Online resource

Resource identifier

code: 52ab9843-d1ee-4b65-a202-38b816fc6093

Metadata language: English

Spatial representation type: Vector

Encoding

Format: Shapefile

Version: n/a

Projection

Classification of data and services

Topic category

Geoscientific information

Classification of data and services

Coupled resource

Classification of data and services

Coupled resource

Keywords

GEMET - INSPIRE themes, version 1.0 ( Theme )

Geologie
geology

GEMET - Concepts, version 2.4 ( Theme )

geophysics
Geophysik
raw material
Rohstoff

Other keywords

Keywords ( Theme )

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

Keywords ( Place )

Laptev Sea
Laptevsee

Geographic coverage

Temporal reference

Temporal extent

Date ( Creation ): 1997-10-15

Quality and validity

Lineage: During the period from 20th of august to 15th of October 1997 BGR aquired seismic lines in the Laptev Sea. The lines BGR97-01, BGR97-02, BGR97-03, BGR97-04, BGR97-04A, BGR97-04B, BGR97-05, BGR97-06, BGR97-07, BGR97-08 are processed (stack) data and lines BGR97-09, BGR97-10, BGR97-11, BGR97-12, BGR97-13, BGR97-14, BGR97-15, BGR97-15A, BGR97-16, BGR97-17, BGR97-17A, BGR97-17B, BGR97-17C, BGR97-18, BGR97-19, BGR97-19A, BGR97-20, BGR97-20A, BGR97-21, BGR97-22, BGR97-23, BGR97-24, BGR97-25, BGR97-26, BGR97-27 are processed (migrated) data.

Conformity

Explanation: siehe dazu die angegebene Durchführungsbestimmung

Restrictions on access and use

Access constraints: Allgemeine Geschäftsbedingungen, siehe https://www.bgr.bund.de/AGB - General terms and conditions, see https://www.bgr.bund.de/AGB_en. Die bereitgestellten Informationen sind bei Weiterverwendung wie folgt zu zitieren: Datenquelle: BGR97, (c) BGR, Hannover, 1997