Early Tertiary gravity field reconstructions of the Southwest Pacific
The aim of our study is to chronicle the development of plate boundaries in the Southwest Pacific Ocean during the early Tertiary. This region has been the subject of numerous and often conflicting studies that have attempted to construct the history of plate motion and plate boundary evolution as t...
Published in: | Earth and Planetary Science Letters |
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ftcaltechauth:oai:authors.library.caltech.edu:44894 2023-05-15T14:04:55+02:00 Early Tertiary gravity field reconstructions of the Southwest Pacific Marks, K. M. Stock, J. M. 1997-11 https://authors.library.caltech.edu/44894/ https://resolver.caltech.edu/CaltechAUTHORS:20140411-144331262 unknown Elsevier Marks, K. M. and Stock, J. M. (1997) Early Tertiary gravity field reconstructions of the Southwest Pacific. Earth and Planetary Science Letters, 152 (1-4). pp. 267-274. ISSN 0012-821X. doi:10.1016/S0012-821X(97)00139-8. https://resolver.caltech.edu/CaltechAUTHORS:20140411-144331262 <https://resolver.caltech.edu/CaltechAUTHORS:20140411-144331262> Article PeerReviewed 1997 ftcaltechauth https://doi.org/10.1016/S0012-821X(97)00139-8 2021-11-11T18:57:26Z The aim of our study is to chronicle the development of plate boundaries in the Southwest Pacific Ocean during the early Tertiary. This region has been the subject of numerous and often conflicting studies that have attempted to construct the history of plate motion and plate boundary evolution as the Australia and Pacific plates separated from Antarctica. Our novel approach entails reconstructing gravity fields from satellite altimeter gravity by first removing anomalies overlying seafloor younger than a selected age, and then rotating the remaining anomalies through appropriate finite rotations. Our reconstructions reveal: (1) an extensional plate boundary (the Iselin rift) existed between West and East Antarctica prior to A24 time; (2) the arrival of the Southeast Indian ridge (SEIR) at the Tasman ridge (prior to A24) led to the extinction of the Iselin rift as well as the conversion of the easternmost portion of the Tasman plate boundary (between the SEIR and the Iselin rift) into a transform fault on the Pacific–Antarctic ridge; and (3) an early (A24 or younger) inception of the Australia–Pacific plate boundary. Our scenario for the opening of the Southwest Pacific Ocean can explain the present-day gravity anomalies and magnetic isochrons observed in the northwest Ross Sea. We find that the East Antarctic seafloor northeast of the Iselin Bank was generated by spreading on the Tasman ridge prior to A24 time. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ross Sea Caltech Authors (California Institute of Technology) Antarctic East Antarctica Indian Iselin Bank ENVELOPE(-179.000,-179.000,-72.500,-72.500) Pacific Ross Sea Southeast Indian Ridge ENVELOPE(110.000,110.000,-50.000,-50.000) Tasman Ridge ENVELOPE(163.050,163.050,-78.033,-78.033) Earth and Planetary Science Letters 152 1-4 267 274 |
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Caltech Authors (California Institute of Technology) |
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ftcaltechauth |
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description |
The aim of our study is to chronicle the development of plate boundaries in the Southwest Pacific Ocean during the early Tertiary. This region has been the subject of numerous and often conflicting studies that have attempted to construct the history of plate motion and plate boundary evolution as the Australia and Pacific plates separated from Antarctica. Our novel approach entails reconstructing gravity fields from satellite altimeter gravity by first removing anomalies overlying seafloor younger than a selected age, and then rotating the remaining anomalies through appropriate finite rotations. Our reconstructions reveal: (1) an extensional plate boundary (the Iselin rift) existed between West and East Antarctica prior to A24 time; (2) the arrival of the Southeast Indian ridge (SEIR) at the Tasman ridge (prior to A24) led to the extinction of the Iselin rift as well as the conversion of the easternmost portion of the Tasman plate boundary (between the SEIR and the Iselin rift) into a transform fault on the Pacific–Antarctic ridge; and (3) an early (A24 or younger) inception of the Australia–Pacific plate boundary. Our scenario for the opening of the Southwest Pacific Ocean can explain the present-day gravity anomalies and magnetic isochrons observed in the northwest Ross Sea. We find that the East Antarctic seafloor northeast of the Iselin Bank was generated by spreading on the Tasman ridge prior to A24 time. |
format |
Article in Journal/Newspaper |
author |
Marks, K. M. Stock, J. M. |
spellingShingle |
Marks, K. M. Stock, J. M. Early Tertiary gravity field reconstructions of the Southwest Pacific |
author_facet |
Marks, K. M. Stock, J. M. |
author_sort |
Marks, K. M. |
title |
Early Tertiary gravity field reconstructions of the Southwest Pacific |
title_short |
Early Tertiary gravity field reconstructions of the Southwest Pacific |
title_full |
Early Tertiary gravity field reconstructions of the Southwest Pacific |
title_fullStr |
Early Tertiary gravity field reconstructions of the Southwest Pacific |
title_full_unstemmed |
Early Tertiary gravity field reconstructions of the Southwest Pacific |
title_sort |
early tertiary gravity field reconstructions of the southwest pacific |
publisher |
Elsevier |
publishDate |
1997 |
url |
https://authors.library.caltech.edu/44894/ https://resolver.caltech.edu/CaltechAUTHORS:20140411-144331262 |
long_lat |
ENVELOPE(-179.000,-179.000,-72.500,-72.500) ENVELOPE(110.000,110.000,-50.000,-50.000) ENVELOPE(163.050,163.050,-78.033,-78.033) |
geographic |
Antarctic East Antarctica Indian Iselin Bank Pacific Ross Sea Southeast Indian Ridge Tasman Ridge |
geographic_facet |
Antarctic East Antarctica Indian Iselin Bank Pacific Ross Sea Southeast Indian Ridge Tasman Ridge |
genre |
Antarc* Antarctic Antarctica East Antarctica Ross Sea |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ross Sea |
op_relation |
Marks, K. M. and Stock, J. M. (1997) Early Tertiary gravity field reconstructions of the Southwest Pacific. Earth and Planetary Science Letters, 152 (1-4). pp. 267-274. ISSN 0012-821X. doi:10.1016/S0012-821X(97)00139-8. https://resolver.caltech.edu/CaltechAUTHORS:20140411-144331262 <https://resolver.caltech.edu/CaltechAUTHORS:20140411-144331262> |
op_doi |
https://doi.org/10.1016/S0012-821X(97)00139-8 |
container_title |
Earth and Planetary Science Letters |
container_volume |
152 |
container_issue |
1-4 |
container_start_page |
267 |
op_container_end_page |
274 |
_version_ |
1766276371323027456 |