The structure and segmentation of the Southeast Indian Ridge ...
The Southeast Indian Ridge (SEIR) spreads at a relatively narrow range of intermediate rates (59–75 km/Ma) but exhibits the full range of slow to fast spreading morphology and segmentation. Satellite gravity data reveal transitions in the structure of the spreading center where it is influenced by t...
| Main Authors: | , , , |
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| Format: | Article in Journal/Newspaper |
| Language: | unknown |
| Published: |
Columbia University
1999
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.7916/d8-bqjh-sm67 https://academiccommons.columbia.edu/doi/10.7916/d8-bqjh-sm67 |
| Summary: | The Southeast Indian Ridge (SEIR) spreads at a relatively narrow range of intermediate rates (59–75 km/Ma) but exhibits the full range of slow to fast spreading morphology and segmentation. Satellite gravity data reveal transitions in the structure of the spreading center where it is influenced by the Amsterdam and Kerguelen hotspots and at the Australian– Antarctic Discordance (AAD). Although the spreading rate between the hotspots and the AAD is nearly constant, the ridge exhibits a variety of distinct styles of morphology and segmentation not observed at fast or slow spreading centers. Recently, collected multibeam bathymetry data reveal a transition from East Pacific Rise style overlapping axial highs near 92°E to Mid-Atlantic Ridge style axial valleys with non-transform offsets near 116°E. The intervening segmentation is characterized by propagating offsets coexisting with stationary transforms, which exhibit different degrees of temporal stability. Currently, there are 10 transform offsets between the ... |
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