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dc.contributor.authorJourdain, A.
dc.contributor.authorSingh, S.C.
dc.contributor.authorEscartin, J.
dc.contributor.authorKlinger, Y.
dc.contributor.authorKameshRaju, K.A.
dc.contributor.authorMcArdle, J.
dc.date.accessioned2016-07-11T09:14:26Z
dc.date.available2016-07-11T09:14:26Z
dc.date.issued2016
dc.identifier.citationGeology, vol.44(6); 2016; 351-354
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/4987
dc.description.abstractThe 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
dc.language.isoen
dc.publisherGeological Society of America
dc.rightsCopyright [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.
dc.subjectOCEANOGRAPHY AND LIMNOLOGY
dc.subjectGEOLOGY AND GEOPHYSICS
dc.subjectGEOLOGY AND GEOPHYSICS
dc.subjectGEOLOGY AND GEOPHYSICS
dc.titleCrustal accretion at a sedimented spreading center in the Andaman Sea
dc.typeJournal Article


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