Browsing Scholarly literature by Author "Rao, V.P."
Now showing items 41-60 of 96
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Indian summer monsoon variability during the Holocene as recorded in sediments of the Arabian Sea: Timing and implications
Thamban, M.; Kawahata, H.; Rao, V.P. (TERRAPUB, 2007)Indian monsoon precipitation fluctuated significantly during the Holocene and a reliable reconstruction of the timing of the events and their implications is of great benefit to our understanding of the effect and response ... -
Iron ore pollution in Mandovi and Zuari estuarine sediments and its fate after mining ban
Kessarkar, P.M.; Suja, S.; Sudheesh, V.; Srivastava, S.; Rao, V.P. (Springer, 2015)Iron ore was mined from the banded iron formations of Goa, India, and transported through the Mandovi and Zuari estuaries for six decades until the ban on mining from September 2012. Here we focus on the environmental ... -
Late Quaternary Halimeda bioherms and aragonitic faecal pellet-dominated sediments on the carbonate platform of the western continental shelf of India
Rao, V.P.; Veerayya, M.; Nair, R.R.; Dupeuble, P.A.; Lamboy, M. (Elsevier, 1994)The Fifty Fathom Flat is a drowned carbonate platform located on the outer continental shelf of western India. It unique because the carbonate depositional environment prevailed until Early Holocene in spite of its proximity ... -
Late Quaternary sea level and environmental changes from relic carbonate deposits of the western margin of India
Rao, V.P.; Rajagopalan, G.; Vora, K.H.; Almeida, F. (Indian Academy of Sciences, 2003)Relic carbonate deposits along the western margin of India occur as dolomite crusts, aragonite sands (pelletal / oolitic) and aragonite-cemented limestones, oyster shells, corals, encrusted coralline algal and foraminife ... -
Lime muds and their genesis off-Northwestern India during the late Quaternary
Rao, V.P.; AnilKumar, A.; Naqvi, S.W.A.; Chivas, A.R.; Sekar, B.; Kessarkar, P.M. (Indian Academy of Sciences, 2012)Two sediment types were found in five gravity cores collected from water depths between 56 m and 121 m along the northwestern continental margin of India. lime mud was abundant in the lower section while siliciclastic ... -
Magnetic properties of sediments in cores from the Mandovi estuary, western India: Inferences on provenance and pollution
Prajith, A.; Rao, V.P.; Kessarkar, P.M. (Elsevier, 2015)Magnetic properties of sediments were investigated in 7 gravity cores recovered along a transect of the Mandovi estuary, western India to understand their provenance and pollution. The maximum magnetic susceptibility of ... -
Major and trace metals in suspended and bottom sediments of the Mandovi and Zuari estuaries, western India: distribution, source, and pollution
Shynu, R.; Rao, V.P.; Kessarkar, P.M. (Springer, 2017)Major elements and trace metals in suspended sediments along transect stations of the Mandovi and Zuari estuaries showed three types of distribution: (a) high concentrations of most metals (Al, Fe, Mn, Cr, Pb, Cu, Ni, Zn, ... -
Marine geology
Rao, V.P.; Shankar, R. (Indian Natl. Sci. Acad., New Delhi-110 002, India, 2000)Significant scientific contributions in Marine Geology in India during the Nineties have been highlighted in this paper. Sediment trap data collected in the Arabian Sea and Bay of Bengal have provided much understanding ... -
Marine geology
Rao, V.P. (New Delhi: Indian National Science Academy, 2004)Marine geological investigations for the last four years extend from water column to sedimentary records. The sediment trap experiments in the Arabian Sea showed strong correlation between seasonal variations of pteropod/planktic ... -
Microbial dolomite crusts from the carbonate platform off western India
Rao, V.P.; Kessarkar, P.M.; Krumbein, W.E.; Krajewski, K.P.; Schneider, R.J. (International Association of Sedimentologists, 2003)The occurrence of Late Pleistocene dolomite crusts that occur at 64 m depth on the carbonate platform off western India is documented. Dolomite is the most predominant mineral in the crusts. In thin section, the crust ... -
Microbial origin of the phosphorites of the western continental shelf of India
Rao, V.P.; Nair, R.R. (Elsevier, 1988)Phosphatised algal nodules were recovered by dredging from the western continental shelf off Goa at depths ranging from 70 to 150 m. Energy dispersive X-ray analysis indicates that the phosphorus present in the algal nodules ... -
Mineralogy and Sr–Nd isotopes of SPM and sediment from the Mandovi and Zuari estuaries: Influence of weathering and anthropogenic contribution
Rao, V.P.; Shynu, R.; Singh, S.K.; Naqvi, S.W.A.; Kessarkar, P.M. (Elsevier, 2015)Clay minerals and Sr–Nd isotopes of suspended particulate matter (SPM) and bottom sediment were investigated along transect stations of the Mandovi and Zuari estuaries, western India to determine the provenance and role ... -
Mineralogy of polymetallic nodules and associated sediments from the Central Indian Ocean Basin
Rao, V.P. (Elsevier, 1987)Todorokite is the dominant mineral phase in the nodules of the northern Central Indian Ocean Basin. These nodules are characterised by a rough surface texture, are relatively rich in Mn, Cu and Ni, and are associated with ... -
Miocene phosphorites from the Murray Ridge, northwestern Arabian Sea
Rao, V.P.; Hegner, E.; Naqvi, S.W.A.; Kessarkar, P.M.; Ahmad, S.M.; Raju, D.S. (Elsevier, 2008)Phosphorites from the Murray Ridge, NW Arabian Sea comprise nodules, bioclasts, and bone fragments. The nodules are made up of a homogeneous, light-colored phosphate nucleus consisting of Rivulariacean filamentous cyanobacteria ... -
Nannostructure and significance of fish coprolites in phosphorites
Lamboy, M.; Rao, V.P.; Ahmed, E.; Azzouzi, N. (Elsevier, 1994)Phosphatic coprolites (0.5-2 cm long) occurring in Cretaceous-Eocene phosphorites of Tunisia, Morocco, Mauritania, Senegal, and Egypt were investigated for their petrology by using SEM. They exhibit a homogeneous porous ... -
Nature, distribution and origin of clay minerals in grain size fractions of sediments from manganese nodule field, Central Indian Ocean Basin
Rao, V.P.; Nath, B.N. (CSIR-NISCAIR, 1988)DT, IR and X-ray diffraction analyses have been carried out on 3 grain size fractions (1, 1-2 and 2-4 mu m) of sediments from the Central Indian Ocean Basin. Results indicate that there are 2 smectite minerals (montmorillonite ... -
New stable isotope records of sediment cores from the SE Arabian Sea - Inferences on the variations in monsoon regime during the late Quaternery
Thamban, M.; Rao, V.P. (Indian Academy of Sciences, 2001)We reconstruct here the changes in regional hydrography related to the fluctuations in Indian monsoons during the late Quaternary based on the stable isotope composition of the foraminifers and organic matter in three ... -
On the occurrence of caliche pisolites from the western continental shelf of India
Rao, V.P. (Elsevier, 1990)Pisolitic limestones collected from the western continental shelf of India, at a depth of 60 m, showed characters similar to caliche pisolites. Low-magnesium calcite and quartz are the major minerals in the pisolites. ... -
On the possibility of high-velocity tidal sterams as dynamic barriers to longshore sediment transport: evidence from the continental shelf off the Gulf of Kutch, India
Nair, R.R.; Hashimi, N.H.; Rao, V.P. (Elsevier, 1982)Differences in the bathymetry, bottom topography and the abundance of mica and clay minerals on the continental shelf north and south of the Gulf of Kutch, a macrotidal bay, indicate the presence of two distinct sedimentary ... -
Organic carbon in sediments of the southwestern margin of India: Influence of productivity and monsoon variability during the Late Quaternary
Kessarkar, P.M.; Rao, V.P. (Geological Society of India, 2007)The texture, organic carbon (OC), CaC03 and Rock-Eval parameters of the sediments from two gravity cores collected at depths below the oxygen minimum zone (OMZ) of the southwestern margin of India are presented and compared ...