The crustal structure and tectonic development of the continental margin of the Amundsen Sea Embayment, West Antarctica: implications from geophysical data
The Amundsen Sea Embayment of West Antarctica represents a key component in the tectonic history of Antarctic-New Zealand continental breakup. The region played a major role in the plate-kinematic development of the southern Pacific from the inferred collision of the Hikurangi Plateau with the Gondw...
Published in: | Geophysical Journal International |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
WILEY-BLACKWELL PUBLISHING
2014
|
Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/35404/ https://epic.awi.de/id/eprint/35404/1/Kalberg-Gohl_crustal-structure-ASE-margin_GJI_2014.pdf https://hdl.handle.net/10013/epic.43573 https://hdl.handle.net/10013/epic.43573.d001 |
id |
ftawi:oai:epic.awi.de:35404 |
---|---|
record_format |
openpolar |
spelling |
ftawi:oai:epic.awi.de:35404 2024-09-15T17:39:03+00:00 The crustal structure and tectonic development of the continental margin of the Amundsen Sea Embayment, West Antarctica: implications from geophysical data Kalberg, Thomas Gohl, Karsten 2014-07 application/pdf https://epic.awi.de/id/eprint/35404/ https://epic.awi.de/id/eprint/35404/1/Kalberg-Gohl_crustal-structure-ASE-margin_GJI_2014.pdf https://hdl.handle.net/10013/epic.43573 https://hdl.handle.net/10013/epic.43573.d001 unknown WILEY-BLACKWELL PUBLISHING https://epic.awi.de/id/eprint/35404/1/Kalberg-Gohl_crustal-structure-ASE-margin_GJI_2014.pdf https://hdl.handle.net/10013/epic.43573.d001 Kalberg, T. and Gohl, K. orcid:0000-0002-9558-2116 (2014) The crustal structure and tectonic development of the continental margin of the Amundsen Sea Embayment, West Antarctica: implications from geophysical data , Geophysical Journal International, 198 (1), pp. 327-341 . doi:10.1093/gji/ggu118 <https://doi.org/10.1093/gji%2Fggu118> , hdl:10013/epic.43573 EPIC3Geophysical Journal International, WILEY-BLACKWELL PUBLISHING, 198(1), pp. 327-341, ISSN: 0956-540X Article isiRev 2014 ftawi https://doi.org/10.1093/gji/ggu118 2024-06-24T04:09:53Z The Amundsen Sea Embayment of West Antarctica represents a key component in the tectonic history of Antarctic-New Zealand continental breakup. The region played a major role in the plate-kinematic development of the southern Pacific from the inferred collision of the Hikurangi Plateau with the Gondwana subduction margin at approximately 110-100 Ma to the evolution of the West Antarctic Rift System. However, little is known about the crustal architecture and the tectonic processes creating the embayment. During two RV Polarstern expeditions in 2006 and 2010 a large geophysical dataset was collected consisting of seismic-refraction and reflection data, ship-borne gravity and helicopter-borne magnetic measurements. Two P-wave velocity-depth models based on forward travel-time modelling of nine ocean bottom hydrophone recordings provide an insight into the lithospheric structure beneath the Amundsen Sea Embayment. Seismic-reflection data image the sedimentary architecture and the top-of-basement. The seismic data provide constraints for 2-D gravity modelling, which supports and complements P-wave modelling. Our final model shows 10 - 14 km thick stretched continental crust at the continental rise that thickens to as much as 28 km beneath the inner shelf. The homogenous crustal architecture of the continental rise, including horst and graben structures are interpreted as indicating that wide-mode rifting affected the entire region. We observe a high-velocity layer of variable thickness beneath the margin and related it, contrary to other “normal volcanic type margins”, to a proposed magma flow along the base of the crust from beneath eastern Marie Byrd Land – West Antarctica to the Marie Byrd Seamount province. Furthermore, we discuss the possibility of upper mantle serpentinization by seawater penetration at the Marie Byrd Seamount province. Hints of seaward-dipping reflectors indicate some degree of volcanism in the area after break-up. A set of gravity anomaly data indicate several phases of fully developed and ... Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Antarctica Marie Byrd Land West Antarctica Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Geophysical Journal International 198 1 327 341 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The Amundsen Sea Embayment of West Antarctica represents a key component in the tectonic history of Antarctic-New Zealand continental breakup. The region played a major role in the plate-kinematic development of the southern Pacific from the inferred collision of the Hikurangi Plateau with the Gondwana subduction margin at approximately 110-100 Ma to the evolution of the West Antarctic Rift System. However, little is known about the crustal architecture and the tectonic processes creating the embayment. During two RV Polarstern expeditions in 2006 and 2010 a large geophysical dataset was collected consisting of seismic-refraction and reflection data, ship-borne gravity and helicopter-borne magnetic measurements. Two P-wave velocity-depth models based on forward travel-time modelling of nine ocean bottom hydrophone recordings provide an insight into the lithospheric structure beneath the Amundsen Sea Embayment. Seismic-reflection data image the sedimentary architecture and the top-of-basement. The seismic data provide constraints for 2-D gravity modelling, which supports and complements P-wave modelling. Our final model shows 10 - 14 km thick stretched continental crust at the continental rise that thickens to as much as 28 km beneath the inner shelf. The homogenous crustal architecture of the continental rise, including horst and graben structures are interpreted as indicating that wide-mode rifting affected the entire region. We observe a high-velocity layer of variable thickness beneath the margin and related it, contrary to other “normal volcanic type margins”, to a proposed magma flow along the base of the crust from beneath eastern Marie Byrd Land – West Antarctica to the Marie Byrd Seamount province. Furthermore, we discuss the possibility of upper mantle serpentinization by seawater penetration at the Marie Byrd Seamount province. Hints of seaward-dipping reflectors indicate some degree of volcanism in the area after break-up. A set of gravity anomaly data indicate several phases of fully developed and ... |
format |
Article in Journal/Newspaper |
author |
Kalberg, Thomas Gohl, Karsten |
spellingShingle |
Kalberg, Thomas Gohl, Karsten The crustal structure and tectonic development of the continental margin of the Amundsen Sea Embayment, West Antarctica: implications from geophysical data |
author_facet |
Kalberg, Thomas Gohl, Karsten |
author_sort |
Kalberg, Thomas |
title |
The crustal structure and tectonic development of the continental margin of the Amundsen Sea Embayment, West Antarctica: implications from geophysical data |
title_short |
The crustal structure and tectonic development of the continental margin of the Amundsen Sea Embayment, West Antarctica: implications from geophysical data |
title_full |
The crustal structure and tectonic development of the continental margin of the Amundsen Sea Embayment, West Antarctica: implications from geophysical data |
title_fullStr |
The crustal structure and tectonic development of the continental margin of the Amundsen Sea Embayment, West Antarctica: implications from geophysical data |
title_full_unstemmed |
The crustal structure and tectonic development of the continental margin of the Amundsen Sea Embayment, West Antarctica: implications from geophysical data |
title_sort |
crustal structure and tectonic development of the continental margin of the amundsen sea embayment, west antarctica: implications from geophysical data |
publisher |
WILEY-BLACKWELL PUBLISHING |
publishDate |
2014 |
url |
https://epic.awi.de/id/eprint/35404/ https://epic.awi.de/id/eprint/35404/1/Kalberg-Gohl_crustal-structure-ASE-margin_GJI_2014.pdf https://hdl.handle.net/10013/epic.43573 https://hdl.handle.net/10013/epic.43573.d001 |
genre |
Amundsen Sea Antarc* Antarctic Antarctica Marie Byrd Land West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica Marie Byrd Land West Antarctica |
op_source |
EPIC3Geophysical Journal International, WILEY-BLACKWELL PUBLISHING, 198(1), pp. 327-341, ISSN: 0956-540X |
op_relation |
https://epic.awi.de/id/eprint/35404/1/Kalberg-Gohl_crustal-structure-ASE-margin_GJI_2014.pdf https://hdl.handle.net/10013/epic.43573.d001 Kalberg, T. and Gohl, K. orcid:0000-0002-9558-2116 (2014) The crustal structure and tectonic development of the continental margin of the Amundsen Sea Embayment, West Antarctica: implications from geophysical data , Geophysical Journal International, 198 (1), pp. 327-341 . doi:10.1093/gji/ggu118 <https://doi.org/10.1093/gji%2Fggu118> , hdl:10013/epic.43573 |
op_doi |
https://doi.org/10.1093/gji/ggu118 |
container_title |
Geophysical Journal International |
container_volume |
198 |
container_issue |
1 |
container_start_page |
327 |
op_container_end_page |
341 |
_version_ |
1810477141590016000 |