Institute's contributions: Recent submissions
Now showing items 3721-3740 of 9252
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Distribution of planktonic foraminifera in waters of the submarine coral banks in southeast Arabian Sea during winter
(NISCAIR, New Delhi, 1992)Twentyfive species of planktonic foraminifera are recorded from 36 plankton tows collected from waters of the submerged coral banks- Bassas de Pedro, Sesostris and Cora Divh-located at northern end of the Laccadive group ... -
Fluctuating sea levels off Bombay (India) between 14,500 and 10,000 years before present
(Current Science Association, Bangalore, India, 1992)A 26.5-metre-long core collected from the outer-shelf area off Bombay (India) at 75 m water depth showed ooids and shallow-water benthic foraminifera all along the core. The presence of these well-known indicators of ... -
The upwelling record in the sediments of the westen continental margin of India
(Pergamon, 1992)Analysis of 63 sediment samples from the western continental margin of India for planktonic foraminifera, organic carbon, biogenic silica and calcium carbonate content showed higher frequency (30-40%) of Globigerina bulloides ... -
Gravity anomalies over a segment of Pratap ridge and adjoining shelf margin basin, western continental margin of India
(Oxford and IBH, New Delhi, 1992)Bathymetric and gravity data totalling 2000 line km on the continental margin off Goa and Mulki, west of India have been studied. The free-air gravity anomalies vary between -60 to 25 mgals with prominent NNW-SSE trends ... -
Design of a gravity corer for near shore sediment sampling
(NISCAIR, New Delhi, 1992)For the purpose of geotechnical investigation a gravity corer has been designed and fabricated to obtain undisturbed sediment core samples from near shore waters. The corer was successfully operated at 75 stations up to ... -
Regional geomorphology of the continental slope of NW India: Delineation of the signatures of deep-seated structures
(Taylor and Francis, 1992)Geomorphological features (derived from 16,000 lkm of echo-sounding and bathymetric data) and deep-seated tectonic tectonic structures of the continental margin off NW India are presented. The shelf break over the entire ... -
Organic carbon removal in the sea: the continental connection
(Geological Society of London, 1992)Time series sediment traps have been deployed since May 1986 in the Arabian Sea and since October 1987 in the Bay of Bengal. The results of one and a half years from the western, central, and eastern Arabian Sea and of one ... -
Magnetic studies over the northern extension of the Prathap ridge complex, eastern Arabian sea
(Springer, 1992)The northern parts of the Prathap and Laccadive Ridge system, eastern Arabian Sea, consist of three parallel basement ridge peaks at varied depths. The topographic highs are associated with either well developed or subdued ... -
A note on incipient spilitisation of central Indian basin basalts
(Geological Society of India, 1992)Rocks dredged in the vicinity of the 79 degrees E fracture zone, in the Central Indian Basin, are sub-alkaline basalts, which are regarded as precursors to spilites. The minerals identified are mainly albitic plagioclase, ... -
Organic carbon in the sediments of the lower reaches of Periar River
(Indian Fisheries Association, 1992)Sediments are indicators of the quality of water overlying them and hence, useful in the assessment of environmental pollution. Temporal and spatial variations in sediment characteristics and organic carbon content from 9 ... -
Textural studies of beach sediments from Sadashivagad and Karwar, Central west coast of India
(Indian Society of Earth Sciences, Calcutta, 1992)Analysis of textural parameters such as mean grain size, standard deviation, skewness and kurtosis was done for 48 surface sediment samples of two close but separate beaches, namely Sadashivagad and Karwar, in the Central ... -
Marine geophysical studies along a transect across the continental margin off Bombay coast, west of India
(Oxford and IBH, New Delhi, 1992)Study of underway geophysical data along a transect of 415 km across the continental margin off Bombay, (Maharashtra, India), between 800 and 3600 m water depths reveals seven seismic sequences consisting of parallel and ... -
Stable isotopic variations in foraminiferal test from Arabian Sea and its relation to the annual south-west monsoonal rainfall over the Indian subcontinent
(Current Science Association, Bangalore, India, 1992)Examination of delta 18O estimations from the planktonic foraminifera, Globigerinoides ruber, collected at fortnightly intervals using deep sea sediment traps moored at depths of 1000 and 2787 m in the Eastern Arabian Sea ... -
A critical evaluation of depositional parameters controlling the variability of organic carbon in Arabian Sea sediments
(Elsevier, 1992)Organic carbon distribution in the surficial sediments of the Arabian Sea to some extends mirrors the surface productivity, being both high in the peripheral portions and low in the central region, suggesting that the ... -
Planktonic percentage of foraminiferal fauna in surface sediments of the Arabian sea (Indian Ocean) and a regional model for paleodepth determination
(Elsevier, 1992)The percentage of planktonic specimens in foraminiferal assemblages were determined in 126 surface sediment samples (depth range 13 to 1050 m) from the Arabian Sea along the western continental margin of India. The results ... -
The Cretaceous-Tertiary sea floor off Dronning Maud Land, Antarctica
(Elsevier, 1992)A study of the bathymetric and linear magnetic anomalies between Dronning Maud Land, Antarctica and the South West Indian Ridge (SWIR) revealed a Mesozoic sequence of linear magnetic anomalies, M0 to M12 (108-126 Ma), a ... -
Geophysical studies for the evaluation of offshore placer deposits and basement configuration
(Oxford and IBH, New Delhi, 1992)The marine geophysical studies carried out on the inner continental shelf of the central west coast of India suggested the offshore extension of onshore placer deposits upto 12 m water depths, and beyond these depths sands ... -
Sulphur enrichment in a sediment core from the central western continental margin of India
(Current Science Association, Bangalore, India, 1992)Anomalous sulphur values in relation to organic carbon have been found in the sediments of a core collected from the central western continental margin of India. The relationship between organic carbon and sulphur is similar ... -
Possible microbial origin of phosphorites on Error Seamount, northwestern Arabian Sea
(Elsevier, 1992)Petrographical, mineralogical and microprobe analysis of phosphorites from Error Seamount, in the northwestern Arabian Sea, demonstrates that microbial processes played an important role in the early diagenetic formation ...