Record Details

Formation of diapiric structure in the deformation zone, central Indian Ocean: A model from gravity and seismic reflection data

DRS at CSIR-National Institute of Oceanography

View Archive Info
 
 
Field Value
 
Title Formation of diapiric structure in the deformation zone, central Indian Ocean: A model from gravity and seismic reflection data
 
Creator Krishna, K.S.
Rao, D.G.
Neprochnov, Y.P.
 
Subject seismic reflection data
bathymetry
 
Description Analyses of bathymetry, gravity and seismic reflection data of the diffusive plate boundary in the central Indian Ocean reveal a new kind of deformed structure besides the well-reported structures of long-wavelength anticlinal basement rises and high-angle reverse faults. The structure (basement trough) has a length of about 150 km and deepens by up to 1 km from its regional trend (northward dipping). The basement trough includes a rise at its center with a height of about 1.5 km. The rise is about 10 km wide with rounded upper surface and bounded by vertical faults. A broad free-air gravity low of about 20 mGal and a local high of 8 mGal in its center are associated with the identified basement trough and rise structure respectively. Seismic results reveal that the horizontal crustal compression prevailing in the diffusive plate boundary might have formed the basement trough possibly in early Pliocene time. Differential loading stresses have been generated from unequal crust/sediment thickness on lower crustal and upper antle rocks. A thin semi-ductile serpentinite layer existing near the base of the crust that is interpreted to have been formed at mid-ocean ridge and become part of the lithosphere, may have responded to the downward loading stresses generated by the sediments and crustal rocks to inject the serpentinites into the overlying strata to form a classic diapiric structrure.
 
Date 2006-09-04T07:52:07Z
2006-09-04T07:52:07Z
2002
 
Type Journal Article
 
Identifier Proc. Indian Acad. Sci. (Earth Planet. Sci.), vol.111(1), 17-28p.
http://drs.nio.org/drs/handle/2264/364
 
Language en
 
Format 516096 bytes
application/pdf
 
Publisher Indian Academy of Sciences