Now showing items 6911-6930 of 9513
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Past 20,000-year history of Himalayan aridity: Evidence from oxygen isotope records in the Bay of Bengal
(Indian Academy of Sciences, 2003)Late Quaternary climate history of the Himalayas is inferred from sea surface salinity (SSS) changes determined from the oxygen isotope in planktonic foraminifers, in a turbidity-free, 14C-dated core from the Bay of Bengal. ... -
Evidence of fault reactivation off Pondicherry coast from marine geophysical data
(Indian Academy of Sciences, 2002)The present study mainly focuses on the northern part of the Cauvery offshore basin, between latitudes 10 degrees and 14 degrees N, and longitudes 80 degrees and 82 degrees E, over which the bathymetry, gravity and magnetic ... -
Origin of ash in the Central Indian Ocean Basin and its implication for the volume estimate of the 74,000 year BP Youngest Toba eruption
(Indian Academy of Sciences, 2002)A controversy exists about the origin of ash in the Central Indian Ocean Basin (CIOB). In situ silicic volcanism and Indonesian arc volcanism have been proposed as sources of ash in the basin. We present here the detailed ... -
Marine bioinvasion: Concern for ecology and shipping
(Indian Academy of Sciences, 2002)Marine bioinvasion - introduction of marine organisms alien to local ecosystem through ship hulls and ballast water - has serious consequences to native biota, fishery and general coastal ecosystem. Over 80% of the world ... -
Enhanced biological production off Chennai triggered by October 1999 super cyclone (Orissa)
(Indian Academy of Sciences, 2002)The results of physical forcings on primary production, its variation and associated hydrography of the southwestern Bay of Bengal during the southwest monsoon (July) and post-cyclone period (November) of 1999 were studied ... -
Indian marine bivalves: Potential source of antiviral drugs
(Indian Academy of Sciences, 2002)Extracts prepared from economically important marine bivalves such as green mussel (Perna viridis), estuarine oyster (Crassostrea madrasensis), giant oyster (Crassostrea gryphoides), estuarine clam (Meretrix casta), black ... -
Variations in nearshore processes along Nagapattinam coast, India
(Indian Academy of Sciences, 2002)Directional wave data collected at 10 m water depth, at 2 km distance off Nagore from March 1998 to February 1999, were used to estimate the longshore currents and longshore sediment transport rate considering the sea and ... -
Cultural sequence of Bet Dwarka Island based on thermoluminescence dating
(Indian Academy of Sciences, 2002)Earlier studies on the onshore and inter-tidal zone explorations in Bet Dwarka island had revealed the presence of a large number of potsherds and other antiquities that correspond to the protohistoric (2000-1500 BC), ... -
Geomorphological and petrological observations along a segment of slow-spreading Carlsberg Ridge
(Indian Academy of Sciences, 2002)A 120-km-long section of the Carlsberg Ridge has been mapped with multi-beam bathymetry system (MBS). High-resolution bathymetric contour map generated with the MBS data shows well-defined axial valley bordered by steep ... -
The plight of Indian sea horses: Need for conservation and management
(Indian Academy of Sciences, 2002)The increasing demand for seahorses in Asian traditional medicines, tonic food aphrodisiacs, as aquarium fishes, souvenirs and curios are concomitant with a decline in capture fisheries and destruction of habitats. The ... -
Role of nematodes as bioindicators in marine and freshwater habitats
(Indian Academy of Sciences, 2002)Nematodes as bioindicator of water quality and ecosystem function has been emphasized. The behaviour of a nematode parasite Rostellascaris sp. As a biological tag and useful discriminant of habitats and in fishery exploitation ... -
Geotechnical properties of siliceous sediments from the Central Indian Basin
(Indian Academy of Sciences, 2002)Indian Deep-Sea Environment Experiment (INDEX) was carried out in a pre-selected area with low nodule abundance and uniform sediment type, for the purpose of environmental impact assessment of future deep-sea mining ... -
Occurrence of pockmarks and gas seepages along the central western continental margin of India
(Indian Academy of Sciences, 2002)High-resolution seismic reflection profiling has revealed the occurrence of acoustic masking, pockmarks, gas seepages and plumes on the inner shelf, middle shelf and upper continental slope of western India, between 20 and ... -
A synthesis of sedimentary geochemical processes in and around Carlsberg Ridge
(Indian Academy of Sciences, 2001)The geochemical sedimentation processes active in and around the Carlsberg ridge area of the Indian Ocean have been synthesized. From the available information it is evident that hydrogenetic sedimentation process is most ... -
Implications of post-disturbance studies on the grain size of the sediments from the Central Indian Basin
(Indian Academy of Sciences, 2001)Indian Deep-Sea Environment Experiment (INDEX) was conducted by simulating benthic disturbance and resuspension of the sediments in 3 km ´ 200 m narrow strip at 5300 m water depth in the Central Indian Basin (CIB). Using ... -
Heavy sediment influx during early Holocene: Inference from clay mineral studies in a core from the western Bay of Bengal
(Indian Academy of Sciences, 2001)Clay mineral studies were carried out in a 650 cm long sediment core collected at a depth of 2200 m from the north-western Bay of Bengal. Illite is the predominant mineral, followed by montmorillonite and chlorite. Illite ... -
High biological productivity in the central Arabian Sea during the summer monsoon driven by Ekman pumping and lateral advection
(Indian Academy of Sciences, 2001)Open oceans are generally oligotrophic and support less biological production. Results from the central Arabian Sea show that it may be an exception to this. We provide the observational evidence of fairly high biological ... -
18 Ka BP records of climatic changes, Bay of Bengal: Isotopic and sedimentological evidences
(Indian Academy of Sciences, 2001)Based upon the oxygen isotopic records of Globigerinoide sacculifer, the clay mineral assemblages and aridity indicator chlorite/illite (C/I) ratio, the palaeoclimatic changes during the past 18 Ka BP have been archived. ... -
Submerged beach ridge lineation and associated sedentary fauna in the innershelf of Gopalpur Coast, Orissa, Bay of Bengal
(Indian Academy of Sciences, 2001)Detailed echosounding and side-scan sonar surveys coupled with SCUBA-diving operations in the innershelf region of Gopalpur, Orissa coast revealed the existence of a submerged NE-SW trending ridge lineation between the ... -
Respiratory enzyme activities in the oxygen-deficient waters of the Arabian Sea
(Indian Academy of Sciences, 2001)Denitrification in the oxygen-poor waters at intermediate depths in the Arabian Sea is very intense. Depth profiles of nitrite and the activities of the electron transport system (ETS) and dissimilatory enzymes such as ...

