DRS at CSIR-National Institute of Oceanography: Recent submissions
Now showing items 3711-3730 of 9371
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Petrography and chemistry of basalts from the Carlsberg ridge
(Geological Society of India, 1991)The petrography of the basalts collected in dredge hauls from the Carlsberg Ridge (3 degrees 37'N and 64 degrees 07'E) show systematic variations in their textural and mineralogical assemblages, from an outermost vitreous ... -
Internal constitution of manganese nodules from the Central Indian Ocean basin
(NISCAIR, New Delhi, 1991)Morphological, chemical, physical and acoustic properties of Mn-nodules in the the Indian Ocean are inter-linked and depend much on local and regional oceanic environments. These nodules are anisotropic and sound propagation ... -
Marine geophysical surveys off Kaverppattinam for archaeological investigations
(Society for Marine Archaeology, Goa, 1991)Marine geophysical surveys were carried out in Madras, 1990 in the offshore regions of Tranquebar and Kaverippattinam covering the area between 5 and 15 m water depth. In addition to several isolated objects, a continuous ... -
Buried late Pleistocene fluvial channels on the inner continental shelf off Vengurla, west coast of India
(Coastal Research Foundation, 1991)Analysis of echosounding, side-scan sonar and shallow seismic data collected west of Burnt islands off Vengurla, west coast of India, revealed a featureless seabed, thicknesses of subsurface layers, and presence of buried ... -
Marine positioning for exploration of offshore resources
(Marine Technology Society, Rosenstiel School of Marine and Atmpospheric Science, Univ. of Miami, 1991) -
Petrology of rift-related basalts at Bombay High waters, Arabian Sea
(NISCAIR, New Delhi, 1991)Tholeiitic basalts obtained in 6 cores from Bombay High Region (Maharashtra, India), at depths of 860-2550 m below the seabed, are of low K and high Fe types. SiO sub(2) varies from 45.68 to 50.72%, K sub(2)O 0.09 to 0.69%, ... -
Clay mineral distribution in the continental shelf and slope off Saurashtra, West coast of India
(NISCAIR, New Delhi, 1991)Clay mineral distribution in the sediments of the west coast of India indicates that the illite and chlorite-rich sediments, derived from the Indus, occupy the continental shelf of the northern part of the Gulf of Kutch. ... -
New ichthyoliths from ferromanganese crusts and nodules from the Central Indian Ocean Basin
(Micropaleontology Press, 1991)Ferromanganese encrusted hardgrounds, their intraclasts and the nuclei of manganese nodules collected from the Central Indian Ocean basin have yielded plentiful numbers of ichthyoliths. Forty well-knon ichthyoliths, one ... -
Morphologic investigation of uncharted seamount from Central Indian Basin revisited with multibeam sonar system
(Taylor and Francis, 1991) -
Shores of the central west coast of India - a case study using remote sensing data
(Indian Association for Limnology and Oceanography, 1991)Geomorphological studies along the Central West Coast of India extending between Bombay to Goa, have been undertaken, using aerial photographs and LANDSAT imagery. Coastal features like active and abandoned cliffs, spits, ... -
Comparison of internal features and microchemistry of ferromanganese crusts from the Central Indian Basin
(Springer, 1991)SEM/probe analyses of two ferromanganese crusts from the Central Indian Basin, formed on basalt substrate, reveal botryoids and cusps. The botryoids composed of delta-MnOs2, are enriched in Co, and the cusps and laminations ... -
Geotechnical properties of Karwar marine clay
(Indian Geotechnical Society, New Delhi, 1991)Karwar marine clay possesses high plasticity characteristics with natural water content higher than the liquid limit. Liquidity index was as high as 1.7. Predominant clay mineral was kaolinite. Undrained shear strength ... -
Geotechnical studies of Jaitapur marine clay
(NIO, Goa, 1991)A gravity corer was designed and fabricated for near shore sediment sampling. The corer was operated off Jaitapur, West Coast of India, and 70 cores were obtained. The performance of the corer was quite satisfactory. The ... -
Biogenic influence on the growth of ferromanganese micronodules in the Central Indian Ocean
(Elsevier, 1991)In a 20 cm core collected from the Central Indian Basin, with increasing depth, the abundance of ferromanganese micronodules decreases as their size increases, and the surface texture changes from rough to smooth. Biological ... -
Nature and distribution of manganese nodules from three sediment domains of the Central Indian Basin, Indian Ocean
(Springer, 1991)Manganese nodules from the Central Indian Basin (5 degrees-10 degrees S) vary in abundance, morphology, mineralogy, and chemistry with water depth and sediment type. Nodules from the southern region, dominatEd. by siliceous ... -
Interstitial and adsorbed phosphates in shelf sediments off Visakhapatnam, east coast of India
(NISCAIR, New Delhi, 1991)Spatial distribution of interstitial and adsorbed phosphates in the shelf sediments shows an increasing trend with distance from coastal to inshore region. Maximum concentration ranges of interstitial and adsorbed phosphates ... -
Glacial to interglacial contrast in the calcium carbonate content and influence of Indus discharge in two eastern Arabian sea cores
(Elsevier, 1991)Two cores collected in the eastern Arabian Sea were studied for coarse fraction, calcium carbonate content and Globorotalia menardii complex abundance. Based on the fluctuations of calcium carbonate and G. menardii complex ... -
An experimental study of velocities under pressure for ancient oceanic rocks
(Springer, 1991)Seismic velocities of Indus suture rock types from Dras-Sanko-Kargil, Kashmir Himalaya, as a function of pressure up to 10 kbar were studied. The high-pressure measurements on the rocks reflect the depthwise increase in ... -
Buried nodules and associated sediments from the central Indian Basin
(Springer, 1991)Buried nodules from siliceous sediments in the central Indian Basin are morphologically variable and mineralogically consist of d-MnO2 incipient todorokite. Compositionally they are weakly diagenetic. The sediment coarse ...