Origin of the Rajmahal Traps and the 85 degree E Ridge: Preliminary reconstructions of the trace of the Crozet hotspot

Journal Article · Sun Dec 01 04:00:00 EST 1991 · Geology; (United States)

DOI:https://doi.org/10.1130/0091-7613(1991)019<1237:OOTRTA>2.3.CO;2· OSTI ID:7031500

Curray, J R; Munasinghe, T ^[1]

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1. Scripps Institution of Oceanography, La Jolla, CA (United States)

The 85{degree}E Ridge is a buried aseismic ridge approximately parallel to and west of the Ninetyeast Ridge in the northeastern Indian Ocean. It was previously shown to be of probable volcanic origin emplaced on very young oceanic crust, but no satisfactory model of emplacement of the rocks was offered. The authors propose a model of origin of the Rajmahal Traps of northeastern India, the 85{degree}E Ridge, and Afanasy Nikitin Seamount as the trace of the hotspot that now lies beneath the Crozet Islands in the southern Indian Ocean. This reconstruction places the Kerguelen hotspot, which formed the Ninetyeast Ridge, at the triple junction between Greater India, Australia, and Antarctica before the breakup of eastern Gondwana.

• OSTI ID: 7031500
• Journal Information: Geology; (United States), Journal Name: Geology; (United States) Vol. 19:12; ISSN GLGYB; ISSN 0091-7613
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
BATHYMETRY
GEOLOGIC HISTORY
GEOLOGIC MODELS
IGNEOUS ROCKS
INDIAN OCEAN
PLATE TECTONICS
ROCKS
SEA-FLOOR SPREADING
SEAS
SURFACE WATERS
TECTONICS
VOLCANIC ROCKS