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Seismic stratigraphy of the Raggatt Basin, southern Kerguelen Plateau: tectonic and paleoceanographic implications

Seismic stratigraphy of the Raggatt Basin, southern Kerguelen Plateau: tectonic and paleoceanographic implications
Seismic stratigraphy of the Raggatt Basin, southern Kerguelen Plateau: tectonic and paleoceanographic implications
During Cenozoic and late Mesozoic time, sediment accumulated in the Raggatt Basin on the southern Kerguelen Plateau. We describe the seismic stratigraphy of the Raggatt Basin, utilizing multichannel seismic (MCS) data obtained by the Bureau of Mineral Resources, Geology and Geophysics (Australia) and the Institut de Physique du Globe de Strasbourg (France). Seven major seismic stratigraphic sequences in the Raggatt Basin overlie a basement complex of Early Cretaceous age. The underlying basement complex is characterized by two types of seismic images: acoustic basement and a layered basement which includes dipping reflectors. The seismic stratigraphic sequences include terrestrial and shallow-water units K1 and K2 of Early to Late Cretaceous age, which fill depressions in the basement; a thick unit, K3, of Late Cretaceous to Paleocene age, which is of mixed shallow-water and open-marine facies and in places has a mounded (carbonate) upper surface; a depression-filling pelagic deposit, P1, of Late Cretaceous to Eocene age; a thick pelagic unit, P2, which is mainly Eocene in age; and two post-Eocene pelagic sequences, PN1 and NQ1, which are relatively thin and more limited in areal extent than the underlying sequences. Highlights in the geologic history of the Raggatt Basin include formation and erosion of the basement complex in a subaerial or shallow-water environment in Early Cretaceous time; differential subsidence, probably thermal in origin, and development of carbonate mounds and a major western boundary transform fault in Late Cretaceous time; renewed subsidence near the Cretaceous-Tertiary boundary possibly related to formation of the Labuan Basin/Diamantina Zone by sea-floor spreading; and vigorous Antarctic Circumpolar Current activity beginning by Oligocene time, probably related to the breakup of the northern Kerguelen Plateau and Broken Ridge.
1050-9747
563-579
Coffin, M.F.
b8285650-5efd-4129-ae91-1cf3f5911e89
Munschy, M.
59888679-1199-4c7d-a184-eade10c558b2
Colwell, J.B.
f08effc2-c4dc-465d-864a-df6e7fe329d5
Schlich, R.
f0dcbefb-120f-4680-b6d2-acabe29b91d4
Davies, H.L.
0d9fe44c-542e-4c7d-af87-cc41620b8370
Li, Z.G.
4cb68152-b9c9-437d-8edc-71827dd50cff
Coffin, M.F.
b8285650-5efd-4129-ae91-1cf3f5911e89
Munschy, M.
59888679-1199-4c7d-a184-eade10c558b2
Colwell, J.B.
f08effc2-c4dc-465d-864a-df6e7fe329d5
Schlich, R.
f0dcbefb-120f-4680-b6d2-acabe29b91d4
Davies, H.L.
0d9fe44c-542e-4c7d-af87-cc41620b8370
Li, Z.G.
4cb68152-b9c9-437d-8edc-71827dd50cff

Coffin, M.F., Munschy, M., Colwell, J.B., Schlich, R., Davies, H.L. and Li, Z.G. (1990) Seismic stratigraphy of the Raggatt Basin, southern Kerguelen Plateau: tectonic and paleoceanographic implications. Bulletin of the Geological Society of America, 102, 563-579. (doi:10.1130/0016-7606(1990)102<0563:SSOTRB>2.3.CO;2).

Record type: Article

Abstract

During Cenozoic and late Mesozoic time, sediment accumulated in the Raggatt Basin on the southern Kerguelen Plateau. We describe the seismic stratigraphy of the Raggatt Basin, utilizing multichannel seismic (MCS) data obtained by the Bureau of Mineral Resources, Geology and Geophysics (Australia) and the Institut de Physique du Globe de Strasbourg (France). Seven major seismic stratigraphic sequences in the Raggatt Basin overlie a basement complex of Early Cretaceous age. The underlying basement complex is characterized by two types of seismic images: acoustic basement and a layered basement which includes dipping reflectors. The seismic stratigraphic sequences include terrestrial and shallow-water units K1 and K2 of Early to Late Cretaceous age, which fill depressions in the basement; a thick unit, K3, of Late Cretaceous to Paleocene age, which is of mixed shallow-water and open-marine facies and in places has a mounded (carbonate) upper surface; a depression-filling pelagic deposit, P1, of Late Cretaceous to Eocene age; a thick pelagic unit, P2, which is mainly Eocene in age; and two post-Eocene pelagic sequences, PN1 and NQ1, which are relatively thin and more limited in areal extent than the underlying sequences. Highlights in the geologic history of the Raggatt Basin include formation and erosion of the basement complex in a subaerial or shallow-water environment in Early Cretaceous time; differential subsidence, probably thermal in origin, and development of carbonate mounds and a major western boundary transform fault in Late Cretaceous time; renewed subsidence near the Cretaceous-Tertiary boundary possibly related to formation of the Labuan Basin/Diamantina Zone by sea-floor spreading; and vigorous Antarctic Circumpolar Current activity beginning by Oligocene time, probably related to the breakup of the northern Kerguelen Plateau and Broken Ridge.

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Published date: 1990

Identifiers

Local EPrints ID: 50582
URI: https://eprints.soton.ac.uk/id/eprint/50582
ISSN: 1050-9747
PURE UUID: e366c600-2f20-4200-a3e4-78c9cc9be8d8

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Date deposited: 07 Mar 2008
Last modified: 13 Mar 2019 20:51

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Contributors

Author: M.F. Coffin
Author: M. Munschy
Author: J.B. Colwell
Author: R. Schlich
Author: H.L. Davies
Author: Z.G. Li

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