Tectonic reactivation in the Indian Ocean: Evidences from seamount morphology and manganese nodule characteristics
The Central Indian Ocean Basin (CIOB) was subjected to tectonic reactivation in geological past which is unusual for a basin occurring on an apparently single tectonic plate. ENE-WSW trending latitude parallel zone of reactivation across the central part of the basin is reported. Distinct difference...
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Geological Society of India
1992
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ftnio:oai:dsr.nio.org:2264/3061 2023-05-15T13:59:28+02:00 Tectonic reactivation in the Indian Ocean: Evidences from seamount morphology and manganese nodule characteristics Mukhopadhyay, R. Khadge, N.H. 1992 http://drs.nio.org/drs/handle/2264/3061 en eng Geological Society of India Copyright [1992]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository. Journal Article 1992 ftnio 2012-08-25T20:08:32Z The Central Indian Ocean Basin (CIOB) was subjected to tectonic reactivation in geological past which is unusual for a basin occurring on an apparently single tectonic plate. ENE-WSW trending latitude parallel zone of reactivation across the central part of the basin is reported. Distinct difference in characters of seamounts, manganese nodules and bottom sediment are found in this deformed central part as compared to those from northern and southern parts of this basin. Much lower ratio of height to basal width (h/Wb) of seamounts; and presence of several guyots in this central part are reported. Abundance of smaller, spheroidal, smooth textured nodules; and absence of index radiolarian zone I fossil, coupled with sediment erosion of top several centimeters indicate activity of west-bound Antarctic Bottom Water (ABW) and other turbulent water masses that later passed through the reactivated central part. The cause of this deformation is attributed to wrench-faulting as part of large scale tectonic reactivation during late Miocene Article in Journal/Newspaper Antarc* Antarctic National Institute of Oceanography, India: Digital Repository Service (DRS@nio) Antarctic Indian |
institution |
Open Polar |
collection |
National Institute of Oceanography, India: Digital Repository Service (DRS@nio) |
op_collection_id |
ftnio |
language |
English |
description |
The Central Indian Ocean Basin (CIOB) was subjected to tectonic reactivation in geological past which is unusual for a basin occurring on an apparently single tectonic plate. ENE-WSW trending latitude parallel zone of reactivation across the central part of the basin is reported. Distinct difference in characters of seamounts, manganese nodules and bottom sediment are found in this deformed central part as compared to those from northern and southern parts of this basin. Much lower ratio of height to basal width (h/Wb) of seamounts; and presence of several guyots in this central part are reported. Abundance of smaller, spheroidal, smooth textured nodules; and absence of index radiolarian zone I fossil, coupled with sediment erosion of top several centimeters indicate activity of west-bound Antarctic Bottom Water (ABW) and other turbulent water masses that later passed through the reactivated central part. The cause of this deformation is attributed to wrench-faulting as part of large scale tectonic reactivation during late Miocene |
format |
Article in Journal/Newspaper |
author |
Mukhopadhyay, R. Khadge, N.H. |
spellingShingle |
Mukhopadhyay, R. Khadge, N.H. Tectonic reactivation in the Indian Ocean: Evidences from seamount morphology and manganese nodule characteristics |
author_facet |
Mukhopadhyay, R. Khadge, N.H. |
author_sort |
Mukhopadhyay, R. |
title |
Tectonic reactivation in the Indian Ocean: Evidences from seamount morphology and manganese nodule characteristics |
title_short |
Tectonic reactivation in the Indian Ocean: Evidences from seamount morphology and manganese nodule characteristics |
title_full |
Tectonic reactivation in the Indian Ocean: Evidences from seamount morphology and manganese nodule characteristics |
title_fullStr |
Tectonic reactivation in the Indian Ocean: Evidences from seamount morphology and manganese nodule characteristics |
title_full_unstemmed |
Tectonic reactivation in the Indian Ocean: Evidences from seamount morphology and manganese nodule characteristics |
title_sort |
tectonic reactivation in the indian ocean: evidences from seamount morphology and manganese nodule characteristics |
publisher |
Geological Society of India |
publishDate |
1992 |
url |
http://drs.nio.org/drs/handle/2264/3061 |
geographic |
Antarctic Indian |
geographic_facet |
Antarctic Indian |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_rights |
Copyright [1992]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository. |
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1766268031741198336 |