Browsing by Subject "quaternary"
Now showing items 1-20 of 23
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Basalt microlapilli in deep sea sediments of Indian Ocean in the vicinity of Vityaz fracture zone
(Geological Society of India, 1989)Two cores recovered from the flanks of Mid-India oceanic ridge in the vicinity of Vityaz fracture zone consist of discrete pyroclastic layers at various depths. These layers are composed of coarse-grained, angular basaltic ... -
Changing sedimentary environment during the late Quaternary: Sedimentological and isotopic evidence from the distal Bengal Fan
(Elsevier, 2005)The sediments recovered from two gravity cores of the lower and distal Bengal Fan were investigated for sedimentological properties and Sr -Nd isotopes.Each core exhibits two distinct units, the lower unit 2 and upper unit ... -
Clay minerals as palaeomonsoon proxies: Evaluation and relevance to the late Quaternary records from SE Arabian Sea
(NCAOR, Goa, 2005)Palaeoclimatic studies are largely dependent on the quality of records and a prudent use of environmental proxy indicators. In this study, the factors affecting the detrital clay minerals in marine environment and their ... -
Environmental magnetic studies on some Quaternary sediments of varied depositional settings in the Indian sub-continent
(Elsevier, 2007)The efficacy and limitations of routine environmental magnetic approaches to characterize and compare the Quaternary sediments of varied depositional settings (fluvial, fluvio-lacustrine and marine) from the Indian ... -
Geomorphology and geology of the Bay of Bengal and the Andaman Sea
(Oxford and IBH, New Delhi, 2001)Marine geological studies in the Bay of Bengal were initiated by the Andhra University in early 1950's and have subsequently become widespread during the International Indian Ocean Expedition (IIOE - 1962-65). Geomorphological ... -
Late Quaternary Faunal Change in Coastal Arabian sea Sediments
(Elsevier, 1982)Carbonate content and faunal composition of two gravity cores from the coastal Arabian Sea provide evidence of a major environmental change in surface ocean waters about 13,000 yr B.P. Radiocarbon dating indicates that ... -
Late Quaternary paleoceanographic features as deduced from calcium carbonate and faunal changes of planktonic foraminifers in core samples from northeastern Arabian Sea
(Marine Biological Association of India, 1997)Two pelagic core samples, ARB-52 and ARB-54 from 2240 m and 800 m depths respectively from the Arabian Sea off Bombay were analysed for determining climatic changes during the past 30,000 yr. based on the interpretation ... -
Late-Quaternary variations in clay minerals along the SW continental margin of India: Evidence of climatic variations
(Springer, 2000)Down-core variations in illite, chlorite, smectite and kaolinite (the major clays) in two sup(14)C-dated cores collected along the SW continental margin of India show that illite and chlorite have enhanced abundance during ... -
Nannoplankton from RC9-156 in the southeastern Arabian Sea
(Geological Society of India, 1983)A deep sea core RC9-156 collected in the Arabian Sea at a water depth of 4583 m was analysed for calcareous nannoplankton and dissolution studies. Twelve species of nannoplankton were identified and based on the assemblage, ... -
Orbital frequencies in radiolarian assemblages of the central Indian Ocean: implications on the Indian summer monsoon
(Elsevier, 2003)Radiolarian distribution in surface sediments and its relationships with overlying surface oceanography provided impetus for down-core faunal variation related to changes in monsoon intensity due to the Earth's orbital ... -
Palynological investigation of the sediment cores from the Arabian Sea 2: Dinoflagellate cysts and acritarchs
(Palaeobotanical Society, Lucknow, 1982)The present paper incorporates the study of dinoflagellate cysts and acritarchs recovered from five sediment cores from the Arabian Sea This assemblage is represented by 15 genera and 22 species Of these, 14 species belonging ... -
Planktonic foraminifera from a quaternary deep sea core from the southern Arabian Sea
(Geological Society of India, 1989)An investigation on planktonic foraminifera and calcium carbonate content of a box core collected at a depth of 2556 m from the southern part of the Arabian sea indicates faunal changes depicting Quaternary climatic ... -
Pulleniatina Minimum Events in the Andaman Sea (NE Indian Ocean): Implications for winter monsoon and thermocline changes
(Elsevier, 2011)The late Quaternary record of Pulleniatina obliquiloculata was investigated from two well dated sediment cores from the Andaman Sea (NE Indian Ocean) to examine its paleoceanographic significance and the presence of the ... -
Quaternary carbonate record from the equatorial Indian Ocean and its relationship with productivity changes
(Elsevier, 1999)The CaCO sub(3) content in Quaternary deep-sea sediments from Pacific and Atlantic oceans have been suggested to respond differently to glacial/interglacial cycles; CaCO sub(3), contents are highest during glacials in ... -
Quaternary phosphorites from the continental margin off Chennai, southeast India: Analogs of ancient phosphate stromatolites
(SEPM, Society for Sedimentary Geology, 2000)Pleistocene phosphorites occur on the continental margin off Chennai abundantly in the depth range of 186-293 m. They are associated with outer-shelf glauconites and carbonate skeletals including large shells of molluscs ... -
Quaternary phosphorites off the southeast coast of India
(Elsevier, 2002)Detailed petrological, mineralogical, geochemical and radiogenic (U, Sr, Nd) and stable isotope (C, O, S) studies have been carried out on the Quaternary phosphorites of the continental margin off Chennai, southeast coast ... -
Quaternary radiolarian faunal changes in the tropical Indian Ocean: Inferences to paleomonsoonal oscillation of the 10 degrees S hydrographic front
(Current Science Association, Bangalore, 1997)The northern Indian Ocean is characterized by three distinct surface water masses, i.e. (1) highly saline (greater than 34.5 ppt) Arabian Sea, (2) low saline (less than 34.5 ppt) Bay of Bengal and (3) a moderate salinity ... -
Reconstruction of late Quaternary monsoon oscillations based on clay mineral proxies using sediment cores from the western margin of India
(Elsevier, 2002)In order to reconstruct the variations in the intensity of summer monsoon precipitation during the late Quaternary, two sediment cores from the southwestern continental margin of India were studied for their clay mineral ... -
Rock magnetic records of the sediments of the eastern Arabian Sea: Evidence for the late Quaternary climatic change
(Elsevier, 2005)Rock-magnetic measurements along with grain size, acid-insoluble residue (AIR), organic carbon (OC), CaCO sub(3) and delta sup(18)O of the planktonic foraminifers of the sediments were determined for 15 gravity cores ... -
Seismic and sequence stratigraphy of the central western continental margin of India: late-Quaternary evolution
(Elsevier, 2002)Seismic and sequence stratigraphic architecture of the central western continental margin of India (between Coondapur and south of Mangalore) has been investigated with shallow seismic data. Seismic stratigraphic analysis ...