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The structural boundary between East and West Falkland: new evidence for movement history and lateral extent

The structural boundary between East and West Falkland: new evidence for movement history and lateral extent
The structural boundary between East and West Falkland: new evidence for movement history and lateral extent
The contrasting geology of East Falkland with its Lafonian Basin and E–W D1 fold-belt, and West Falkland, with Precambrian basement exposure and NE–SW D2 fold structures, has led previous researchers to infer a steep basement fault beneath the eastern margin of West Falkland. Recent research on the Falkland Islands has revealed further contrasts between East and West Falkland in: (a) the sedimentary, kerogen facies and thermal maturity of the West Falkland and Lower Lafonia groups and; (b) the structural relief of 6–8 km across the Hornby Anticline between West and East Falkland. These factors indicate that East Falkland has been downthrown to the SE along the Hornby Mountain Fault from Devonian until Jurassic times. Interval velocity and Bouguer Gravity data from a seismic line to the SW of the Falkland Islands reveal a similar basement structure to that interpreted under West Falkland and indicate that the fault continues offshore as a series of fault segments for at least 60 km along strike to the SW.
Falkland Islands, Structural history, Marine geology
0264-8172
13-26
Hyam, D.M.
6b2372bd-a0fc-4e35-b08c-6bed358da6a9
Marshall, J.E.A.
cba178e3-91aa-49a2-b2ce-4b8d9d870b06
Bull, J.M.
974037fd-544b-458f-98cc-ce8eca89e3c8
Sanderson, D.J.
5653bc11-b905-4985-8c16-c655b2170ba9
Hyam, D.M.
6b2372bd-a0fc-4e35-b08c-6bed358da6a9
Marshall, J.E.A.
cba178e3-91aa-49a2-b2ce-4b8d9d870b06
Bull, J.M.
974037fd-544b-458f-98cc-ce8eca89e3c8
Sanderson, D.J.
5653bc11-b905-4985-8c16-c655b2170ba9

Hyam, D.M., Marshall, J.E.A., Bull, J.M. and Sanderson, D.J. (2000) The structural boundary between East and West Falkland: new evidence for movement history and lateral extent. Marine and Petroleum Geology, 17 (1), 13-26. (doi:10.1016/S0264-8172(99)00063-X).

Record type: Article

Abstract

The contrasting geology of East Falkland with its Lafonian Basin and E–W D1 fold-belt, and West Falkland, with Precambrian basement exposure and NE–SW D2 fold structures, has led previous researchers to infer a steep basement fault beneath the eastern margin of West Falkland. Recent research on the Falkland Islands has revealed further contrasts between East and West Falkland in: (a) the sedimentary, kerogen facies and thermal maturity of the West Falkland and Lower Lafonia groups and; (b) the structural relief of 6–8 km across the Hornby Anticline between West and East Falkland. These factors indicate that East Falkland has been downthrown to the SE along the Hornby Mountain Fault from Devonian until Jurassic times. Interval velocity and Bouguer Gravity data from a seismic line to the SW of the Falkland Islands reveal a similar basement structure to that interpreted under West Falkland and indicate that the fault continues offshore as a series of fault segments for at least 60 km along strike to the SW.

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More information

Published date: 2000
Keywords: Falkland Islands, Structural history, Marine geology

Identifiers

Local EPrints ID: 1406
URI: https://eprints.soton.ac.uk/id/eprint/1406
ISSN: 0264-8172
PURE UUID: 6ab61be6-0bd5-4542-ba31-23aaeb6e30e7
ORCID for J.E.A. Marshall: ORCID iD orcid.org/0000-0002-9242-3646
ORCID for D.J. Sanderson: ORCID iD orcid.org/0000-0002-2144-3527

Catalogue record

Date deposited: 27 Apr 2004
Last modified: 06 Jun 2018 13:17

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