Constraints on the proposed Marie Byrd Land-Bellingshausen Plate Boundary from seismic reflection data
Single-channel and multichannel marine seismic data off the coast of West Antarctica collected during two Nathaniel B. Palmer cruises (NP92-8 and NP96-2) in the vicinity of 65°S to 71°S, 220°E to 250°E, reveal a NNW trending graben. We interpret this graben to be part of the paleodivergent plate...
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ftcaltechauth:oai:authors.library.caltech.edu:7g7sf-n9e77 2024-06-23T07:47:55+00:00 Constraints on the proposed Marie Byrd Land-Bellingshausen Plate Boundary from seismic reflection data Heinemann, J. Stock, J. Clayton, R. W. Hafner, K. Cande, S. Raymond, C. 1999-11-10 https://doi.org/10.1029/1998JB900079 unknown American Geophysical Union https://doi.org/10.1029/1998JB900079 oai:authors.library.caltech.edu:7g7sf-n9e77 eprintid:34919 resolverid:CaltechAUTHORS:20121016-104022644 info:eu-repo/semantics/openAccess Other Journal of Geophysical Research B, 104(B11), 25321-25330, (1999-11-10) info:eu-repo/semantics/article 1999 ftcaltechauth https://doi.org/10.1029/1998JB900079 2024-06-12T02:02:50Z Single-channel and multichannel marine seismic data off the coast of West Antarctica collected during two Nathaniel B. Palmer cruises (NP92-8 and NP96-2) in the vicinity of 65°S to 71°S, 220°E to 250°E, reveal a NNW trending graben. We interpret this graben to be part of the paleodivergent plate boundary between the Marie Byrd Land and Bellingshausen plates. This graben coincides with a −520 nT magnetic anomaly to the NNW and a −720 nT anomaly to the SSE, as well as a 20 mGal negative gravity anomaly. Seismic profiles subparallel to the graben (22 km/Ma half-spreading rate) reveal greater seafloor roughness to the NE, where seafloor spreading was slower, than to the SW (27 km/Ma half-spreading rate). These data allow the position of the Marie Byrd Land-Bellingshausen plate boundary to be constrained more precisely than has previously been possible, with a trend of N17°W from 68.52°S, 233.65°E to 68.41°S, 233.56°E. The sediment-filled graben has normal separation of sedimentary layers varying from 740±30 m to 580±20 m imaged in seafloor of age A33y (74 Ma). © 1999 American Geophysical Union. Received 10 September 1997; accepted 29 September 1998. This research was supported by NSF grants OPP- 9317318 and OPP-9317872. We thank Bruce Luyendyk, Robert Bird, and Phillip Schmidt for constructive reviews that helped to improve the paper. We thank the personnel of the Nathaniel B. Palmer and of Antarctic Support Associates for their hard work to ensure the success of the data collection during these two cruises. Contribution 8532, Division of Geological and Planetary Sciences, California Institute of Technology. Published - Heinemann1999.pdf Article in Journal/Newspaper Antarc* Antarctic Antarctica Marie Byrd Land West Antarctica Caltech Authors (California Institute of Technology) Antarctic Byrd Marie Byrd Land ENVELOPE(-130.000,-130.000,-78.000,-78.000) West Antarctica Journal of Geophysical Research: Solid Earth 104 B11 25321 25330 |
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Caltech Authors (California Institute of Technology) |
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Single-channel and multichannel marine seismic data off the coast of West Antarctica collected during two Nathaniel B. Palmer cruises (NP92-8 and NP96-2) in the vicinity of 65°S to 71°S, 220°E to 250°E, reveal a NNW trending graben. We interpret this graben to be part of the paleodivergent plate boundary between the Marie Byrd Land and Bellingshausen plates. This graben coincides with a −520 nT magnetic anomaly to the NNW and a −720 nT anomaly to the SSE, as well as a 20 mGal negative gravity anomaly. Seismic profiles subparallel to the graben (22 km/Ma half-spreading rate) reveal greater seafloor roughness to the NE, where seafloor spreading was slower, than to the SW (27 km/Ma half-spreading rate). These data allow the position of the Marie Byrd Land-Bellingshausen plate boundary to be constrained more precisely than has previously been possible, with a trend of N17°W from 68.52°S, 233.65°E to 68.41°S, 233.56°E. The sediment-filled graben has normal separation of sedimentary layers varying from 740±30 m to 580±20 m imaged in seafloor of age A33y (74 Ma). © 1999 American Geophysical Union. Received 10 September 1997; accepted 29 September 1998. This research was supported by NSF grants OPP- 9317318 and OPP-9317872. We thank Bruce Luyendyk, Robert Bird, and Phillip Schmidt for constructive reviews that helped to improve the paper. We thank the personnel of the Nathaniel B. Palmer and of Antarctic Support Associates for their hard work to ensure the success of the data collection during these two cruises. Contribution 8532, Division of Geological and Planetary Sciences, California Institute of Technology. Published - Heinemann1999.pdf |
format |
Article in Journal/Newspaper |
author |
Heinemann, J. Stock, J. Clayton, R. W. Hafner, K. Cande, S. Raymond, C. |
spellingShingle |
Heinemann, J. Stock, J. Clayton, R. W. Hafner, K. Cande, S. Raymond, C. Constraints on the proposed Marie Byrd Land-Bellingshausen Plate Boundary from seismic reflection data |
author_facet |
Heinemann, J. Stock, J. Clayton, R. W. Hafner, K. Cande, S. Raymond, C. |
author_sort |
Heinemann, J. |
title |
Constraints on the proposed Marie Byrd Land-Bellingshausen Plate Boundary from seismic reflection data |
title_short |
Constraints on the proposed Marie Byrd Land-Bellingshausen Plate Boundary from seismic reflection data |
title_full |
Constraints on the proposed Marie Byrd Land-Bellingshausen Plate Boundary from seismic reflection data |
title_fullStr |
Constraints on the proposed Marie Byrd Land-Bellingshausen Plate Boundary from seismic reflection data |
title_full_unstemmed |
Constraints on the proposed Marie Byrd Land-Bellingshausen Plate Boundary from seismic reflection data |
title_sort |
constraints on the proposed marie byrd land-bellingshausen plate boundary from seismic reflection data |
publisher |
American Geophysical Union |
publishDate |
1999 |
url |
https://doi.org/10.1029/1998JB900079 |
long_lat |
ENVELOPE(-130.000,-130.000,-78.000,-78.000) |
geographic |
Antarctic Byrd Marie Byrd Land West Antarctica |
geographic_facet |
Antarctic Byrd Marie Byrd Land West Antarctica |
genre |
Antarc* Antarctic Antarctica Marie Byrd Land West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Marie Byrd Land West Antarctica |
op_source |
Journal of Geophysical Research B, 104(B11), 25321-25330, (1999-11-10) |
op_relation |
https://doi.org/10.1029/1998JB900079 oai:authors.library.caltech.edu:7g7sf-n9e77 eprintid:34919 resolverid:CaltechAUTHORS:20121016-104022644 |
op_rights |
info:eu-repo/semantics/openAccess Other |
op_doi |
https://doi.org/10.1029/1998JB900079 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
104 |
container_issue |
B11 |
container_start_page |
25321 |
op_container_end_page |
25330 |
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1802638180144381952 |