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Paleocene on-spreading-axis hotspot volcanism along the Ninetyeast Ridge: An interaction between the Kerguelen hotspot and the Wharton spreading center

DRS at CSIR-National Institute of Oceanography

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Title Paleocene on-spreading-axis hotspot volcanism along the Ninetyeast Ridge: An interaction between the Kerguelen hotspot and the Wharton spreading center
 
Creator Krishna, K.S.
Gopala Rao, D.
SubbaRaju, L.V.
Chaubey, A.K.
Shcherbakov, V.S.
Pilipenko, A.I.
Murthy, I.V.R.
 
Subject plate tectonics
spreading centres
hot spots
volcanism
basalts
andesite
palaeocene
 
Description Investigations of three plausible tectonic settings of the Kerguelen hotspot relative to the Wharton spreading center evoke the on-spreading-axis hotspot volcanism of Paleocene (60-54 Ma) age along the Ninetyeast Ridge. The hypothesis is consistent with magnetic lineations and abondoned spreading centers of the eastern Indian Ocean and seismic structure and radiometric dates of the Ninetyeast Ridge. Furthermore, it is supported by the occurrence of oceanic andesites at Deep Sea Drilling Project (DSDP) Site 214, isotopically heterogeneous basalts at Ocean Drilling Program (ODP) Site 757 of approximately the same age (59-58 Ma) at both sites. Intermix basalts generated by plume-mid-ocean ridge (MOR) interaction, exist between 11 degrees and 17 degrees S along the Ninetyeast Ridge. A comparison of age profile along the Ninetyeast Ridge between ODP Sites 758 (82 Ma) and 756 (43 Ma) with similarly aged oceanic crust in the Central Indian Basin and Wharton Basin reveals the existence of extra oceanic crust spanning 11 degrees latitude beneath the Ninetyeast Ridge. The Ninetyeast Ridge was originated when the spreading centres of the Wharton Ridge were absolutely moving northward with respect to a relatively stationery Kerguelen hotspot with multiple southward ridge jumps. In the process, the spreading center coincided with the Kerguelen hotspot and took place on-spreading-axis volcanism along the Ninetyeast Ridge
 
Date 2009-01-10T10:20:27Z
2009-01-10T10:20:27Z
1999
 
Type Journal Article
 
Identifier Proceedings of the Indian Academy of Sciences (Earth Planetary Sciences), Vol.108; 255-267p.
http://drs.nio.org/drs/handle/2264/1756
 
Language en
 
Rights Copyright [1999]. 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.
 
Publisher Indian Academy of Sciences, Bangalore, India