Browsing Institute's contributions by Author "Ahmad, S.M."
Now showing items 1-8 of 8
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A 70 kyr record of monsoon-induced marine productivity changes, terrigenous flux and weathering variations in the southern Bay of Bengal
Banerjee, Barnita; Raza, Waseem; Ahmad, S.M.; Farnaaz, S.; Babu, E.; Shukla, Nihareeka; Mascarenhas-Pereira, M.B.L.; Mallick, Monalisa (Geological Society of India - GeoScienceWorld, 2024)The southwest (SW) and northeast (NE) monsoon winds significantly affect the oceanographic and climatic changes over the Bay of Bengal (BoB). We present here detailed geochemical and isotopic records from two sediment cores ... -
Changing sedimentary environment during the late Quaternary: Sedimentological and isotopic evidence from the distal Bengal Fan
Kessarkar, P.M.; Rao, V.P.; Ahmad, S.M.; Patil, S.K.; AnilKumar, A.; AnilBabu, G.; Chakraborty, S.; SounderRajan, R. (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 and Sr-Nd isotopes of the sediments along the western margin of India and their implication for sediment provenance
Kessarkar, P.M.; Rao, V.P.; Ahmad, S.M.; Babu, G.A. (Elsevier, 2003)Mineralogy and Sr-Nd isotopic composition of the less than 2-m fraction of the Holocene and late Pleistocene sediments from 12 gravity cores collected along the western margin of India were used to delineate the provenance ... -
Glacial to Holocene changes in sea surface temperature and seawater 18O in the northern Indian Ocean
Raza, T.; Ahmad, S.M.; Steinke, S.; Raza, W.; Lone, M.A.; Beja, S.K.; Suseela, G. (Elsevier, 2017)Sea surface temperature (SST) and seawater 18Osw records were generated from sediment cores located in the southern Bay of Bengal (SBOB) and the northeastern Arabian Sea (NEAS) to understand glacial to Holocene changes in ... -
Glacial-interglacial changes in the surface water characteristics of the Andaman Sea: Evidence from stable isotopic ratios of planktonic foraminifera
Ahmad, S.M.; Patil, D.J.; Rao, P.S.; Nath, B.N.; Rao, B.R.; Rajagopalan, G. (Indian Academy of Sciences, 2000)Stable carbon and oxygen isotopic analyses of the planktonic foraminifera (Globigerinoides ruber) from a deep sea sediment core (GC-1) in the Andaman Sea show high glacial-to-Holocene d<sup>18</sup>O amplitude of 2.1% which ... -
Miocene phosphorites from the Murray Ridge, northwestern Arabian Sea
Rao, V.P.; Hegner, E.; Naqvi, S.W.A.; Kessarkar, P.M.; Ahmad, S.M.; Raju, D.S. (Elsevier, 2008)Phosphorites from the Murray Ridge, NW Arabian Sea comprise nodules, bioclasts, and bone fragments. The nodules are made up of a homogeneous, light-colored phosphate nucleus consisting of Rivulariacean filamentous cyanobacteria ... -
Morphology and chemical composition of ash layer of about 8 Ma old from ODP-758 site, Bay of Bengal
Jumaila, C.P.U.; Pattan, J.N.; Ahmad, S.M.; Parthiban, G.; Khedekar, V.D.; Padmakumari, V.M.; Milindraj, P. (CSIR, India, 2017)Glass shards from an ash layer of about 8 Ma old extracted from a core drilled at an ODP-758 site in the Bay of Bengal (BOB) were studied for morphology and chemical composition in order to trace their possible source. ... -
Rock magnetic and geochemical record in a sediment core from the eastern Arabian Sea: Diagenetic and environmental implications during the late quaternary
Rao, V.P.; Kessarkar, P.M.; Patil, S.K.; Ahmad, S.M. (Elsevier, 2008)Rock magnetic concentration, grain size and mineralogy parameters together with organic carbon, calcium carbonate, redox-sensitive elements, delta sup(18) O of Globigerinoides ruber and radiocarbon dating were carried out ...