Browsing by Subject "geochemistry"
Now showing items 21-40 of 115
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Controls on organic carbon distribution in sediments from the eastern Arabian Sea margin
(Springer, 1997)Sediment cores from the upper continental slope of the eastern Arabian Sea have high organic carbon (OC), CaCO sub(3), and sand content at the top. The values decrease with increasing depth in the Holocene and Upper ... -
Deposition of Mn-Cu-Ni-enriched sediments during glacial period in the Central Indian Basin
(Current Science Association, Bangalore, India, 1993)Two siliceous sediment cores collected from the Central Indian Basin have been analysed for organic carbon, biogenic silica, Al, Mn, Ni and Cu content. The concentrations of Mn, Cu and Ni showed one order of magnitude ... -
Determination of petroleum hydrocarbons in sediment samples from Bombay harbour, Dharamtar creek and Amba river estuary
(Scientific Publishers, 1989)The surface sediment samples were collected by van Veen grab sampler during premonsoon, monsoon and postmonsoon seasons from Bombay harbour, Dharamtar creek and Amba river estuary Moisture content of the samples ranges ... -
Dissolved aluminium in the surface microlayer of the eastern Arabian Sea
(Elsevier, 1993)Measurements of dissolved aluminium (Al) in surface microlayer (SML) samples from the eastern Arabian Sea during the southwest (summer) and northwast (winter) monsoon periods have revealed much higher concentrations (23-657 ... -
Distribution of Al, Mn, Ni, Co & Cu in the Non-Lithogenous fractions of Sediments of the Northern Half of the Western Continental Shelf of India
(CSIR-NISCAIR, 1980)Higher amounts of elements are associated with the nonlithogenous fractions of the fine grained terrigenous sediments of the innershelf region with low carbonate content than with the corresponding fractions of the coarse ... -
Distribution of Fe, Mn, Ni, Co, Cu and Zn in Non-Lithogenous Fractions of Sediments of Gulf of Kutch
(CSIR-NISCAIR, 1980)Contributions made by non-lithogenous fractions of sediments constitute a significant portion of the concentrations of the elements associated with the total sediment samples. The minor differences found in their distribution ... -
Distribution of phosphorus and phosphatisation along the western continental margin of India
(Geological Society of India, 1987)Phosphate content in the bulk sediments range from 0.02 to 2.17% and on carbonate free basis it varies from 0.03 to 6.5%. The partition studies indicate that contribution from the acid resistant detrital minerals (HCl ... -
Distribution of phosphorus in the marine sediments off the east coast of India
(National Institute of Sciences of India, 1968)Sediment samples collected from the shelf and slope regions off the East Coast of India between "Swatch of no ground" in the north and Karaikal in the south, have been analysed for their total phosphorus content and its ... -
Distribution of Strontium in Sediments of the Minicoy Atoll, Lakshadweep
(CSIR-NISCAIR, 1980)Sr content in 67 sediment samples collected from the Minicoy reef and lagoon varies from 3960 to 7000 ppm (av. 5630 ppm). The concentration increases from the reef (c 4,000 ppm) in the north and west to the centre of the ... -
Distribution pattern and morphochemical relationships of manganese nodules from the Central Indian Basin
(Springer, 2001)In the Central Indian Basin manganese nodule abundance was variable in all sediment types. Mean abundance varied from 1.5 in calcareous ooze to 10.2 kg/m sup(2) in terrigenous-siliceous ooze sediments. Nodule grade and ... -
Dune associated calcretes, Rhizoliths and Paleosols from the western continental shelf of India
(Geological Society of India, 1997)The calcareous deposits on the western continental shelf of India, off Bhatkal (water depths 50 to 58 m) occur as crusts, sheets, cylinders and reddish brown mudstones. The outer layers of the crusts are micrite-dominated ... -
Environmental magnetism and application in the continental shelf sediments of India
(Elsevier, 2009)Mineral magnetic and geochemical analyses were carried out on surface sediments from the continental shelf of India. The purpose of this study is to examine the environmental assessment of heavy metal concentrations and ... -
Evidence for recent hydrothermal activity in the Central Indian Basin
(Pergamon, 1997)This study documents the first actual prof of recent intraplate volcanic-hydrothermal activity in the Central Indian Basin (CIB). Twenty-six surface sediments and a spade core (37 cm long) from the CIB were examined for ... -
Evidence for the formation of different-sized nodules by different accretionary processes
(Taylor and Francis, 1993)Studies on different-sized polymetallic nodules from the Central Indian Ocean Basin reveal that chemical composition is largely related to the nodule diameter which show systematic decrease in Mn, Cu, and Ni content with ... -
Evidence of Himalayan erosional event at approx. 0.5 Ma from a sediment core from the equatorial Indian Ocean in the vicinityof ODP Leg 116 sites
(Elsevier, 2005)A sediment core collected from an area _100 miles south of the ODP Leg 116 (distal Bengal Fan) in the equatorial Indian Ocean was investigated for microfossils, mineralogy, mineral chemistry, magnetic susceptibility, grain ... -
Evolution of the basalts from three back-arc basins of southwest Pacific
(Springer, 1999)Petrography, petrochemistry, and mineral chemistry of basalts from the Woodlark, Manus, and Lau basins from the southwest Pacific have been studied to understand their magmatic evolution. Basalt from the western Woodlark ... -
Ferrobasalts from the Central Indian Ocean Basin
(Springer, 1999)The occurrence of ferrobasalts recovered from the Central Indian Ocean Basin crust generated at the Southeast Indian Ridge during a phase of moderate to fast spreading accretion (approx 110-190 mm/yr, full rate) is reported. ... -
Ferromanganese nodules and their associated sediments from the Central Indian Ocean Basin: Rare earth element geochemistry
(Taylor and Francis, 2001)The rare earth element (REE) distribution in nine deep-sea ferromanganese nodules and their associated siliceous sediments from the Central Indian Ocean Basin (CIOB) have been studied to elucidate the REE relationship among ... -
First phase monitoring studies of simulated benthic disturbance delineating movement of fine particles in the Central Indian Basin
(Taylor and Francis, 2005)Benthic disturbance due to future deep-sea polymetallic nodule mining would involve extensive sediment plume generation and resedimentation on the sea floor. In order to evaluate the effects of resedimentation on benthic ... -
Fresh pumice from the Central Indian Basin: A Krakatau 1883 signature
(Elsevier, 1995)The occurrence of pumice in the Central Indian Basin (CIB) has been a controversy. Some are of the opinion that these pumices are erupted from a volcano along the Ninetyeast ridge while others suggest the Indonesian are ...