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 |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Elsevier
1997
|
Subjects: | |
Online Access: | https://doi.org/10.1016/S0012-821X(97)00139-8 |
id |
ftcaltechauth:oai:authors.library.caltech.edu:d2md1-bgz59 |
---|---|
record_format |
openpolar |
spelling |
ftcaltechauth:oai:authors.library.caltech.edu:d2md1-bgz59 2024-06-23T07:47:42+00:00 Early Tertiary gravity field reconstructions of the Southwest Pacific Marks, K. M. Stock, J. M. 1997-11 https://doi.org/10.1016/S0012-821X(97)00139-8 unknown Elsevier oai:authors.library.caltech.edu:d2md1-bgz59 eprintid:44894 https://doi.org/10.1016/S0012-821X(97)00139-8 resolverid:CaltechAUTHORS:20140411-144331262 info:eu-repo/semantics/closedAccess Other Earth and Planetary Science Letters, 152(1-4), 267-274, (1997-11) Southwest Pacific lower Tertiary gravity anomalies Geosat plate tectonics reconstruction info:eu-repo/semantics/article 1997 ftcaltechauth https://doi.org/10.1016/S0012-821X(97)00139-8 2024-06-12T06:09:23Z 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. © 1997 Elsevier Science B.V. Received 10 June 1997; accepted 12 August 1997. We thank David McAdoo and Seymour Laxon for providing us with both preliminary and final versions of their ERS-1 satellite marine gravity field w8x covering the Ross Sea and Southwest Pacific Ocean. We also thank Jeanne Hardebeck for providing her Tasman Sea finite rotation. Reviews from Rupert Sutherland, Steve Cande, and an anonymous referee improved this manuscript. J. Stock was supported by NSF grant OCE-9416779. Contribution 6215, California Institute of Technology, Division of Geological and Planetary Sciences. ... 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 Rupert ENVELOPE(-134.187,-134.187,59.599,59.599) Seymour ENVELOPE(-56.767,-56.767,-64.283,-64.283) Southeast Indian Ridge ENVELOPE(110.000,110.000,-50.000,-50.000) Sutherland ENVELOPE(168.467,168.467,-77.500,-77.500) Tasman Ridge ENVELOPE(163.050,163.050,-78.033,-78.033) Earth and Planetary Science Letters 152 1-4 267 274 |
institution |
Open Polar |
collection |
Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
language |
unknown |
topic |
Southwest Pacific lower Tertiary gravity anomalies Geosat plate tectonics reconstruction |
spellingShingle |
Southwest Pacific lower Tertiary gravity anomalies Geosat plate tectonics reconstruction Marks, K. M. Stock, J. M. Early Tertiary gravity field reconstructions of the Southwest Pacific |
topic_facet |
Southwest Pacific lower Tertiary gravity anomalies Geosat plate tectonics reconstruction |
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. © 1997 Elsevier Science B.V. Received 10 June 1997; accepted 12 August 1997. We thank David McAdoo and Seymour Laxon for providing us with both preliminary and final versions of their ERS-1 satellite marine gravity field w8x covering the Ross Sea and Southwest Pacific Ocean. We also thank Jeanne Hardebeck for providing her Tasman Sea finite rotation. Reviews from Rupert Sutherland, Steve Cande, and an anonymous referee improved this manuscript. J. Stock was supported by NSF grant OCE-9416779. Contribution 6215, California Institute of Technology, Division of Geological and Planetary Sciences. ... |
format |
Article in Journal/Newspaper |
author |
Marks, K. M. Stock, J. M. |
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://doi.org/10.1016/S0012-821X(97)00139-8 |
long_lat |
ENVELOPE(-179.000,-179.000,-72.500,-72.500) ENVELOPE(-134.187,-134.187,59.599,59.599) ENVELOPE(-56.767,-56.767,-64.283,-64.283) ENVELOPE(110.000,110.000,-50.000,-50.000) ENVELOPE(168.467,168.467,-77.500,-77.500) ENVELOPE(163.050,163.050,-78.033,-78.033) |
geographic |
Antarctic East Antarctica Indian Iselin Bank Pacific Ross Sea Rupert Seymour Southeast Indian Ridge Sutherland Tasman Ridge |
geographic_facet |
Antarctic East Antarctica Indian Iselin Bank Pacific Ross Sea Rupert Seymour Southeast Indian Ridge Sutherland Tasman Ridge |
genre |
Antarc* Antarctic Antarctica East Antarctica Ross Sea |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ross Sea |
op_source |
Earth and Planetary Science Letters, 152(1-4), 267-274, (1997-11) |
op_relation |
oai:authors.library.caltech.edu:d2md1-bgz59 eprintid:44894 https://doi.org/10.1016/S0012-821X(97)00139-8 resolverid:CaltechAUTHORS:20140411-144331262 |
op_rights |
info:eu-repo/semantics/closedAccess Other |
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_ |
1802651850419208192 |