Large fault fabric of the Ninetyeast Ridge implies near-spreading ridge formation
Ninetyeast Ridge (NER) is a linear volcanic ridge in the Indian Ocean thought to have formed by hotspot volcanism on the northward-drifting Indian plate. Geological data from the ridge are sparse, so its tectonic evolution is poorly known. We studied satellite-derived gravity data, seismic reflectio...
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American Geophysical Union
2010
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ftindianacasci:oai:repository.ias.ac.in:18038 2023-05-15T13:46:24+02:00 Large fault fabric of the Ninetyeast Ridge implies near-spreading ridge formation Sager, W. W. Paul, C. F. Krishna, K. S. Pringle, M. Eisin, A. E. Frey, F. A. Gopala Rao, D. Levchenko, O. 2010 application/pdf http://repository.ias.ac.in/18038/ http://repository.ias.ac.in/18038/1/369.pdf http://europa.agu.org/?view=article&uri=/journals/gl/gl1017/2010GL044347/2010GL044347.xml&t=k. s. krishna unknown American Geophysical Union http://repository.ias.ac.in/18038/1/369.pdf Sager, W. W. Paul, C. F. Krishna, K. S. Pringle, M. Eisin, A. E. Frey, F. A. Gopala Rao, D. Levchenko, O. (2010) Large fault fabric of the Ninetyeast Ridge implies near-spreading ridge formation Geophysical Research Letters, 37 . L17304_1-L17304_5. ISSN 0094-8276 QE Geology Article PeerReviewed 2010 ftindianacasci 2013-01-20T10:15:11Z Ninetyeast Ridge (NER) is a linear volcanic ridge in the Indian Ocean thought to have formed by hotspot volcanism on the northward-drifting Indian plate. Geological data from the ridge are sparse, so its tectonic evolution is poorly known. We studied satellite-derived gravity data, seismic reflection profiles, and multibeam bathymetry to examine NER structure. Gravity data show that the ridge displays a series of nearly E-W trending lineations with average spacing ~0.4° (45 km). In seismic and bathymetry data, these lineations correlate with horsts and grabens that probably formed near the time of ridge emplacement. From their extensional nature and trends, we infer that these faulted structures formed near the spreading ridge that separated the Indian and Antarctic plates and their ubiquity implies the hotspot was never far from this spreading ridge. Article in Journal/Newspaper Antarc* Antarctic Indian Academy of Sciences: Publication of Fellows Antarctic Indian Ner ENVELOPE(6.622,6.622,62.612,62.612) |
institution |
Open Polar |
collection |
Indian Academy of Sciences: Publication of Fellows |
op_collection_id |
ftindianacasci |
language |
unknown |
topic |
QE Geology |
spellingShingle |
QE Geology Sager, W. W. Paul, C. F. Krishna, K. S. Pringle, M. Eisin, A. E. Frey, F. A. Gopala Rao, D. Levchenko, O. Large fault fabric of the Ninetyeast Ridge implies near-spreading ridge formation |
topic_facet |
QE Geology |
description |
Ninetyeast Ridge (NER) is a linear volcanic ridge in the Indian Ocean thought to have formed by hotspot volcanism on the northward-drifting Indian plate. Geological data from the ridge are sparse, so its tectonic evolution is poorly known. We studied satellite-derived gravity data, seismic reflection profiles, and multibeam bathymetry to examine NER structure. Gravity data show that the ridge displays a series of nearly E-W trending lineations with average spacing ~0.4° (45 km). In seismic and bathymetry data, these lineations correlate with horsts and grabens that probably formed near the time of ridge emplacement. From their extensional nature and trends, we infer that these faulted structures formed near the spreading ridge that separated the Indian and Antarctic plates and their ubiquity implies the hotspot was never far from this spreading ridge. |
format |
Article in Journal/Newspaper |
author |
Sager, W. W. Paul, C. F. Krishna, K. S. Pringle, M. Eisin, A. E. Frey, F. A. Gopala Rao, D. Levchenko, O. |
author_facet |
Sager, W. W. Paul, C. F. Krishna, K. S. Pringle, M. Eisin, A. E. Frey, F. A. Gopala Rao, D. Levchenko, O. |
author_sort |
Sager, W. W. |
title |
Large fault fabric of the Ninetyeast Ridge implies near-spreading ridge formation |
title_short |
Large fault fabric of the Ninetyeast Ridge implies near-spreading ridge formation |
title_full |
Large fault fabric of the Ninetyeast Ridge implies near-spreading ridge formation |
title_fullStr |
Large fault fabric of the Ninetyeast Ridge implies near-spreading ridge formation |
title_full_unstemmed |
Large fault fabric of the Ninetyeast Ridge implies near-spreading ridge formation |
title_sort |
large fault fabric of the ninetyeast ridge implies near-spreading ridge formation |
publisher |
American Geophysical Union |
publishDate |
2010 |
url |
http://repository.ias.ac.in/18038/ http://repository.ias.ac.in/18038/1/369.pdf http://europa.agu.org/?view=article&uri=/journals/gl/gl1017/2010GL044347/2010GL044347.xml&t=k. s. krishna |
long_lat |
ENVELOPE(6.622,6.622,62.612,62.612) |
geographic |
Antarctic Indian Ner |
geographic_facet |
Antarctic Indian Ner |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
http://repository.ias.ac.in/18038/1/369.pdf Sager, W. W. Paul, C. F. Krishna, K. S. Pringle, M. Eisin, A. E. Frey, F. A. Gopala Rao, D. Levchenko, O. (2010) Large fault fabric of the Ninetyeast Ridge implies near-spreading ridge formation Geophysical Research Letters, 37 . L17304_1-L17304_5. ISSN 0094-8276 |
_version_ |
1766241869369442304 |