NDLI: Gravity anomalies, crustal structure and rift tectonics at the Konkan and Kerala basins, western continental margin of India

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Journal of Earth System Science : Volume 121, Issue 2, April 2012

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Gravity anomalies, crustal structure and rift tectonics at the Konkan and Kerala basins, western continental margin of India

Content Provider	Springer Nature Link
Author	DEV, SHEENA V CHAND, SHYAM
Copyright Year	2012
Abstract	Litho-stratigraphic variation of sedimentary units constructed from seismic sections and gravity anomaly in the Konkan and Kerala basins of the western continental margin of India (WCMI) have been used to model processes such as lithospheric rifting mechanism, its strength, and evolution of flank uplift topography that led to the present-day Western Ghats escarpment. Based on the process-oriented approach, two lithospheric models (necking and magmatic underplating) of evolution of the margin were tested. Both, necking and underplating models suggest an effective elastic thickness (Te) of 5 km and 10 km along Konkan and Kerala basins, respectively and a deep level of necking at 20 km at both basins. Model study suggests that the necking model better explains the observed gravity anomalies in the southern part of the WCMI. A synthesis of these results along with the previously published elastic thickness estimates along the WCMI suggests that a low-to-intermediate strength lithosphere and a deeper level of necking explains the observed flank-uplift topography of the Western Ghats. Process-oriented gravity modelling further suggests that the lateral variations in the lithospheric strength, though not very significant, exist from north to south within a distance of 600 km in the Konkan and Kerala basins along the WCMI at the time of rifting. A comparison with previous Te estimates from coherence analysis along the WCMI indicates that the lithospheric strength did not change appreciably since the time of rifting and it is low both onshore and offshore having a range of 5–15 km.
Starting Page	813
Ending Page	822
Page Count	10
File Format	PDF
ISSN	02534126
Journal	Journal of Earth System Science
Volume Number	121
Issue Number	3
e-ISSN	0973774X
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-07-04
Publisher Institution	Indian Academy of Sciences
Publisher Place	India
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Passive continental margins effective elastic thickness process-oriented approach Konkan and Kerala basins India Extraterrestrial Physics, Space Sciences Earth Sciences
Content Type	Text
Resource Type	Article
Subject	1900/1901

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