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dc.contributor.authorSAHA, GOKUL KUMARen_US
dc.contributor.authorPrakasam, K.S.en_US
dc.contributor.authorRAI, SHYAM S.en_US
dc.date.accessioned2020-08-28T05:14:35Z
dc.date.available2020-08-28T05:14:35Z
dc.date.issued2020-09en_US
dc.identifier.citationPhysics of the Earth and Planetary Interiors, 306.en_US
dc.identifier.issn0031-9201en_US
dc.identifier.urihttp://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/4988-
dc.identifier.urihttps://doi.org/10.1016/j.pepi.2020.106523en_US
dc.description.abstractSignificant diversity in the Indian lithosphere is seen in 3-D shear wave velocity images inverted from the dispersion of group velocities measured from ambient noise and earthquake waveforms along 21,600 paths. Velocity models constructed at 1° intervals to a depth of 200 km suggest a bipolar nature of the Indian lithosphere. We observe a two layer lithospheric mantle beneath the eastern Peninsular India, comprising the Archean cratons of eastern Dharwar, Bastar, Singhbhum, Chotanagpur, Bundelkhand and the Proterozoic Vindyhan basin. The intra-lithospheric mantle boundary is at a depth of ~90 km where Vs increases from 4.5 km/s to >4.7 km/s. The velocity increase continues to a depth of 140 to 180 km followed by its reversal with a minimum Vs of 4.3–4.4 km/s, possibly representing the lithosphere-asthenosphere boundary. Geologically, these regions correlate with the diamond bearing kimberlite fields. In contrast, the Precambrian terrains of western Dharwar, eastern Deccan Volcanic Province (DVP), southern Granulite terrane and the Marwar block in western India are characterized by an almost uniform lithosphere mantle with Vs of 4.4–4.55 km/s. Presence of lower than expected velocity in the lithosphere could be due to its fertile composition, such as clinopyroxene-rich cumulate or metasomatised peridotite. The imprint of Deccan volcanism is observed as the thinned lithosphere (100–120 km) restricted primarily to the westernmost part of DVP, defining the regional extent of Reunion plume-Indian lithosphere interaction. The seismic velocity image suggests evidence for segmentation of Indian lithosphere beneath the Ganga basin at 75° E and 84° E coinciding the Delhi-Haridwar and the Monghyr-Saharsa ridges. Subduction of such a heterogeneous lithosphere could have contributed to the varying style of deformation and subduction pattern in the Himalayan-Tibet region.en_US
dc.language.isoenen_US
dc.publisherElsevier B.V.en_US
dc.subjectIndiaen_US
dc.subjectLithosphereen_US
dc.subjectCratonen_US
dc.subjectSurface waveen_US
dc.subjectTomographyen_US
dc.subjectAmbient noiseen_US
dc.subject2020en_US
dc.subject2020-AUG-WEEK4en_US
dc.subjectTOC-AUG-2020en_US
dc.titleDiversity in the peninsular Indian lithosphere revealed from ambient noise and earthquake tomographyen_US
dc.typeArticleen_US
dc.contributor.departmentDept. of Earth and Climate Scienceen_US
dc.identifier.sourcetitlePhysics of the Earth and Planetary Interiorsen_US
dc.publication.originofpublisherForeignen_US
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