DRS at CSIR-National Institute of Oceanography: Recent submissions
Now showing items 6121-6140 of 9443
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Changing depositional environments during the Late Quatrnary along the western continental margin of India
(Indian Association of Sedimentologists, 1998)Sedimentalogical and palaeoceanographic studies were carried out on two sediment cores collected within the Oxygen Minimum Zone (OMZ - between 150 to 1200 m water depth) along the western continental margin of India. The ... -
InRidge program: Preliminary results from the first cruise
(Current Science Association, 1998)The first cruise under India's own Ridge research initiative, InRidge collected new data on bathymetry, free-air gravity and magnetic anomalies across the ridge axis between the Vema and Zhivago transform faults in the ... -
Mineralogical and geochemical characters of surface sediments from the central Indian Basin
(Current Science Association, 1998)Mineralogy and geochemistry of three types of surface sediments including their intermixtures, from 31 stations, in the ferromanganese nodule belt of the central Indian basin have been studied. Abundant illite, kaolinite ... -
Periodic deformation of oceanic crust in the central Indian Ocean
(AGU, 1998)New seismic reflection profiles of ~~ 5370 km, running through the Ocean Drilling Program Leg 116 sites and Deep Sea Drilling Project Sites 215 and 218, were obtained to investigate the spatial extent, timing, and nature ... -
Microimpact phenomena on Australasian microtektites: Implications for ejecta plume characteristics and lunar surface processes
(Meteoritical Society, 1998)Detailed investigations of the microimpact phenomena on Australasian microtektites from four samples from the Central Indian Basin reveal an array of features, such as very low-velocity captured droplets, welded projectiles, ... -
Distribution characteristics of co-rich manganese deposits on a seamount in the central Pacific Ocean
(Taylor & Francis, 1998)Distribution characteristics of cobalt-rich manganese deposits were evaluated from stereo photographs and video data on a seamount in the central Pacific Ocean by image analysis, photogrammetric technique, and visual ... -
Driving forces of Indian summer monsoon on Milankovitch and sub-Milankovitch time scales: A review
(Geological Society of India, 1998)A scientific consensus exists that tectonic evolution of Himalaya is the main cause of monsoon initiation and evolution in southeast Asia. Several forcing factors such as tectonic, solar insolation, latent heat transport, ... -
Post-Cretaceous intraplate volcanism in the Central Indian Ocean Basin
(Elsevier, 1998)Interplate volcanism in the Central Indian Ocean Basin (CIOB) has been of much interest, since this tectonicaly young and structurally complex basin holds signatures of at least one major plate reorganisation (at 65 ~c 5 ... -
A pair of seamount chains in the Central Indian Basin, identified from multibeam mapping
(Taylor and Francis, 1998)Seamounts are major physiographic features on the ocean floor. Their study is important to the understanding of the tectonic history of the seafloor. Over 150 seamounts were identified during the multibeam (Hydrosweep ... -
Detection of gas-charged sediments and gas hydrate horizons along the western continental margin of India
(Geological Society, 1998)High-resolution seismic reflection and sub-bottom profiling on the continental margin off western India has revealed the presence of characteristic acoustic maskings in the form of wipe-outs, reflector terminations and ... -
A note on the morphology and tectonics of Kainan Maru Seamount, East Antarctica
(Taylor and Francis, 1998)Kainan Maru Seamount lies off the northern end of the Gunnerus Ridge along the margin of East Antarctica. The seamount is separated from the Gunnerus Ridge by only about 15 km. Detailed Hydrosweep multibeam surveys of the ... -
Importance of plagioclase morphology and composition in magmagenesis of the Carlsberg Ridge basalts
(Indian Geophysical Union, 1998)The morphology and chemical composition of more than 200 plagioclase crystals in the Carlsberg Ridge basalts (3~'35' and 3~'41'N) in relation to the magmagenesis of the basalts is examined. The results indicate that the ... -
Mineral chemistry, bulk composition and source of the ferromanganese nodules nuclei from the Central Indian Ocean Basin
(Springer, 1998)Nuclei of ferromanganses nodules from the Central Indian Ocean Basin show the presence of abundant plagioclase feldspars (1-3 mm diameter). They are indentified as calcic plagioclase (peak at 3.20 A). Plagioclase chemical ... -
A geophysical survey of the De Gerlache Seamounts: Preliminary results
(Springer, 1998)The De Gerlache Seamounts actually consist of two medium-sized guyots, with summits at depths of 350-600 m. Acoustic profiler data show no significant sediment on these guyots. Alkaline basalts dredged from the summit of ... -
Chemistry of surface sediment along a north-south transect across the equator in the Central Indian Basin: An assessment of biogenic and detrital influences on elemental burial on the seafloor
(Elsevier, 1998)The detailed chemistry of the surface sediment collected along a north-south transect across the equator in the Central Indian Ocean suggest that: biogenic sedimentation north of equator is dominated by carbonate ooze and ... -
A tektite fragment discovered in the Central Indian Basin
(Current Science Association, 1998)On the basis of various lines of evidence, tektites are now considered as glassy objects generated by meteorite impacts, distributed in four known strewn fields, of which, the Australasian tektite strewn field is the ... -
A potential phosphorite deposit on the continental margin off Chennai
(Current Science Association, 1998)The geochemistry and mineralogy of the potential phospharite deposits recovered from the continental margin off Chennai, Tamil Nadu (India) and their comparison with other offshore phosphorites is given. The phosphorites ... -
Tectonic reorganization in the Indian Ocean: Evidences from seafloor crenulations
(Current Science Association, 1998)Multibeam bathymetric data from seafloor area of 24,568 km constrained between magnetic anomaly 18 and anomaly 25 in the Central Indian Ocean Basin (CIOB) reveal presence of three types of seafloor lineaments. Deformation ... -
Drift pumice in the central Indian Ocean Basin: Geochemical evidence
(Elsevier, 2008)Abundant white to light grey-coloured pumice without ferromanganese oxide coating occurs within the Quaternary sediments of the Central Indian Ocean Basin (CIOB). Two distinct groups of pumice are identified from their ... -
Early tertiary seafloor spreading magnetic anomalies and paleo-propagators in the northern Arabian Sea
(Elsevier, 1998)Study of closely spaced new marine magnetic profiles, in conjunction with published magnetic data, provide an updated identification of linear magnetic anomalies in the northern Arabian Sea from the Owen Fracture Zone in ...