Record Details

Crustal accretion at a sedimented spreading center in the Andaman Sea

DRS at CSIR-National Institute of Oceanography

View Archive Info
 
 
Field Value
 
Title Crustal accretion at a sedimented spreading center in the Andaman Sea
 
Creator Jourdain, A.
Singh, S.C.
Escartin, J.
Klinger, Y.
KameshRaju, K.A.
McArdle, J.
 
Subject OCEANOGRAPHY AND LIMNOLOGY
GEOLOGY AND GEOPHYSICS
GEOLOGY AND GEOPHYSICS
GEOLOGY AND GEOPHYSICS
 
Description The magmatic, tectonic, and hydrothermal processes forming the oceanic crust along mid-ocean spreading centers are strongly modified at sedimented spreading centers but poorly understood owing to the lack of good crustal images. Here we present high-resolution deep seismic reflection images across the sedimented slow-spreading Andaman Sea spreading center. Several sub-horizontal sills are injected within the sedimentary strata, and no surface eruption is observed. On-axis reversed-phase reflections within the igneous crust correspond to axial magma lenses at different depths. The faults within the axial valley are steeply dipping (65°-75°) in a staircase pattern forming the axial graben. Their base coincides with a shallow-dipping (30°) reflection, defining the zone of extension and magmatism. As the sill-sediment sequences are rafted away from the axis, they are rotated and buried due to subsidence and faulting, forming the upper oceanic crust. The gabbroic lower oceanic crust is separated from the mantle by a complex Moho transition zone probably containing dunite lenses
 
Date 2016-07-11T09:14:26Z
2016-07-11T09:14:26Z
2016
 
Type Journal Article
 
Identifier Geology, vol.44(6); 2016; 351-354
http://drs.nio.org/drs/handle/2264/4987
 
Language en
 
Rights Copyright [2016]. 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 Geological Society of America