Institute's contributions: Recent submissions
Now showing items 3781-3800 of 9429
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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 ... -
Geophysical study of a seamount located on the continental margin of India
(Springer, 1991)Bathymetric, magnetic, and gravity data obtained over a 2,464 m high seamount located in the Arabian Sea indicate that the seamount (inferred mean density = 2.65 gm/cc) extends for 1 km beneath the seafloor and is locally ... -
Genesis and growth of internal microstructures of manganese nodule
(NISCAIR, New Delhi, 1991)Microscopic and microprobe studies of manganese nodule from the Somali basin indicate that the reflectance of Fe-Mn oxyhydroxide varies with Mn and Fe concentrations. The non-oxyhydroxide components (detrital, biogenic ... -
Clay mineral distribution in the continental shelf sediments from Krishna to Ganges river mouth, east coast of India
(NISCAIR, New Delhi, 1991)Ninety six sediment samples (less than 2 mu m fractions) of the eastern continental shelf of India between Ganges in the north and Krishna in the south have been studiEd. by X-ray diffraction. On the basis of nature and ... -
Gravity anomalies and crustal structure of the western continental margin off Goa and Mulki, India
(Elsevier, 1991)Bathymetric and gravity data totalling 2000 line kilometres on the continental margin off Goa and Mulki, India, have been studied and prominent NNW-SSE and ENE-WSW trending free-air gravity anomalies varying between -60 + ... -
A model of basement structure from magnetic anomalies of the Bombay High oil-field west of India
(Elsevier, 1991)Bathymetric and magnetic data along 25 profiles covering the Bombay High and adjacent area on the mid-shelf and inner shelf off the Bombay Coast are studied. Except for the NW-SE and ENE-WSW trending anomaly closures in ... -
Reference datum level
(NIO, Goa, 1991) -
Delineation of structural lineaments from marine magnetic anomalies off Jonnalakonda, East Coast of India
(NISCAIR, New Delhi, 1991)Bathymetric and total magnetic intensity data off Jonnalakonda, south of Visakhapatnam, India have been collected. Magnetic anomaly contour map revealed that (1) the well developed magnetic anomaly occurring seaward side ... -
Environmental considerations of nodule mining in Central Indian basin
(Offshore Technology Conference, 1991)The status of benthic population and their physical and chemical environment in the CIB have been evaluated. The information on nodule populations and their association with benthic activity leads to prediction of potential ... -
Lithogenic fluxes to the deep Arabian Sea measurEd. by sediment traps
(Pergamon, 1991)Particle fluxes measured continuously for one year at three locations in the Arabian Sea using time-series sediment traps show that lithogenic sedimentation processes are strongly coupled to biological processes. The ... -
Enhanced particle fluxes in Bay of Bengal inducEd. by injection of freshwater
(Macmillan, 1991)The melting of ice sheets during deglaciation results in the injection of large amounts of fresh water into the oceans. To investigate how such injections might influence particle fluxes in the ocean, and hence the uptake ... -
Organic carbon in the sediments of Mandovi estuary, Goa
(NISCAIR, New Delhi, 1991)Total organic carbon (TOC) in surficial sediments in Mandovi Estuary, Goa, India varies widely from 0.1 to 3% (av. 1.05%). Highest values of TOC (2.4-3%) lie close to the mouth region and indicate no definite trend in its ... -
Petroleum hydrocarbon concentration in sediments along northern west coast of India
(NISCAIR, New Delhi, 1991)Gas chromatography revealed that nonpolar material extracted from surface sediments collected along the northern west coast of India was originated from petroleum hydrocarbon residue. Petroleum hydrocarbon levels as ...