Continental margin of Andhra Pradesh: Some new problems and perspectives

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dc.contributor.author Murthy, K.S.R.
dc.date.accessioned 2006-09-25T09:57:16Z
dc.date.available 2006-09-25T09:57:16Z
dc.date.issued 1999
dc.identifier.citation Visakha Science Journal, vol.3(1), 21-28p.
dc.identifier.uri http://drs.nio.org/drs/handle/2264/427
dc.description.abstract The continental margin of Andhra Pradesh from Nellore (14°N) in the south to Baruva (around 19°N) in the north can be classified into two major parts, viz., the non-basinal, Baruva - Visakhapatnam - Kakinada margin and the basinal part comprising the Krishna - Godavari basin and the Nizampatnam Bay. Extensive bathymetric, magnetic, high resolution seismic reflection and gravity data were collected over the margin by the National Institute of Oceanography for the last one decade. Analysis of the data provided significant results on offshore resources and geodynamics and neotectonics of the margin. Geophysical and geological data revealed heavy mineral placer concentrations in the innershelf of Visakhapatnam - Bhimunipatnam shelf, palaeochannels beneath the innershelf of Pudimadaka, Gangavaram, Visakhapatnam and Bhimunipatnam, with probable association of heavy minerals, relict carbonates in the outershelf of Visakhapatnam and Kalingapatnam. In the K-G offshore basin, zones of gaseous sediments and gas seepages were located in the shelf and slope regions. Interpretation of geophysical data brought out clear evidence of neotectonic activity associated with the structural lineaments extending into the innershelf of Visakhapatnam - Vizianagaram region of the non-basina! part, and also delineated Pranhita- Godavari Gondwana graben and two other oldest Pre-Cambrian Chintalapudi and Avanigadda cross trends into the offshore K-G basin. An isolated volcanic source of limited lateral extent is also located off Machilipatnam in the K-G basin at the foot of the continental slope, at around 3000 m water depth. These preliminary findings suggest that the exploration of the Andhra Pradesh margin should be followed up more vigorously to infer its neotectonics and geodynamics and to identify targets for exploitation of non-living resources.
dc.format.extent 123164 bytes
dc.format.mimetype application/pdf
dc.language.iso en
dc.publisher AP Akademi of Sciences, India
dc.subject continental margin
dc.subject seismic reflection
dc.subject gravity data
dc.subject heavy mineral placer
dc.title Continental margin of Andhra Pradesh: Some new problems and perspectives
dc.type Journal Article


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