Browsing by Subject "PALAEO-STUDIES"
Now showing items 1-17 of 17
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A comparison of Mg/Ca ratios in Globigerinoides ruber (white): sensu stricto versus a mixture of genotypes
(Geological Society of India, 2016)Mg/Ca ratios were measured in core AAS9/21 from the eastern Arabian Sea (EAS), on two sets of planktonic foraminifera, one with a mixture of Globigerinoides ruber genotypes (sensu stricto and sensu lato) and the second ... -
Assessing the suitability of benthic foraminiferal morpho-groups to reconstruct paleomonsoon from Bay of Bengal
(Indian Academy of Sciences, 2016)Temporal changes in benthic foraminiferal morpho-groups were suggested as an effective proxy to reconstruct past monsoon intensity from the Arabian Sea. Here, in order to test the applicability of temporal variation in ... -
Benthic ecological mapping of the Ayeyarwady delta shelf off Myanmar, using foraminiferal assemblages
(The Palaeontological Society of India, 2014)Information on benthic ecologies is a prerequisite to evaluate marine resources, their management and monitoring the impact arising from their exploitation. In the present study, benthic foraminiferal distributions from ... -
Boninitic metavolcanic rocks and island arc tholeiites from the Older Metamorphic Group (OMG) of Singhbhum Craton, eastern India: Geochemical evidence for Archean subduction processes
(Elsevier, 2015)The metavolcanic rocks of the Paleo-Mesoarchean Older Metamorphic Group (OMG) from Jagannathpur area of the Singhbhum Craton occur as enclaves within the Singhbhum granites (SBG). The primary mineralogical composition of ... -
Fluctuations of Mediterranean outflow water circulation in the Gulf of Cadiz during MIS 5 to 7: Evidence from benthic foraminiferal assemblage and stable isotope records
(Elsevier, 2015)We studied variations in benthic foraminiferal assemblages and δ<sup>13</sup>C for the last 225 kyr at IODP site U1387 which is currently bathed by upper core of the Mediterranean Outflow Water (MOW). The MOW paleocirculation ... -
Interhemispheric controls on deep ocean circulation and carbon chemistry during the last two glacial cycles
(American Geophysical Union, 2015)Changes in ocean circulation structure, together with biological cycling, have been proposed for trapping carbon in the deep ocean during glacial periods of the Late Pleistocene, but uncertainty remains in the nature and ... -
Late Holocene (~ 2 ka) East Asian Monsoon variations inferred from river discharge and climate interrelationships in the Pearl River Estuary
(Elsevier, 2014)A sediment core from the Pearl River Estuary (PRE) was analyzed for grain size and organic geochemistry parameters (TOC and δ13C<sub>org</sub>). The results showed that high mean grain-size value and increased sand content ... -
Mid-Pleistocene climate transition drives net mass loss from rapidly uplifting St. Elias mountains, Alaska
(National Academy of Sciences of the United States of America, 2015)Erosion, sediment production, and routing on a tectonically active continental margin reflect both tectonic and climatic processes; partitioning the relative importance of these processes remains controversial. Gulf of ... -
Non-destructive foraminiferal paleoclimatic proxies: A brief insight
(Indian National Science Academy, 2015)Non-Destructive Foraminiferal Paleoclimatic Proxies: A Brief Insight The knowledge of past climate can help us to understand imminent climatic changes. Oceans are the vast archives of past climate. Various indirect techniques ... -
Oxygen isotopic analyses of individual planktic foraminifera species: Implications for seasonality in the western Arabian Sea
(Copernicus Publications, 2014)The variation of stable isotopes between individual shells of planktic foraminifera of a given species and size may provide short-term seasonal insight on Paleoceanography. In this context, oxygen isotope analyses of ... -
Proceedings of the Integrated Ocean Drilling Program Vol. 341: Expedition reports Southern Alaska margin
(Integrated Ocean Drilling Program, 2014)A remarkable expedition discovery is the substantial sediment volume accumulating on the shelf, slope, and deep sea fan since the early Pleistocene intensification of Northern Hemisphere glaciation and more significantly ... -
South Asian summer monsoon variability during the last ~54 kyrs inferred from surface water salinity and river run off proxies
(Elsevier, 2016)The past variability of the South Asian Monsoon is mostly known from records of wind strength over the Arabian Sea while high-resolution paleorecords from regions of strong monsoon precipitation are still lacking. Here, ... -
The tectonic stress field evolution of India since the Oligocene
(Elsevier, 2015)A multitude of observations suggest neotectonic deformation in and around India, but its causes and history are unknown. We use a 2 dimensional finite element model with heterogeneous elastic strengths in continental regions ... -
Timing and preservation mechanism of deglacial pteropod spike from the Andaman Sea, northeastern Indian Ocean
(John Wiley, 2015)The aragonite compensation depth (ACD) fluctuated considerably during the last glacial until the Holocene with a dominant pteropod preservation spike during the deglacial period, which is prominently seen in three well-dated ... -
Tracing the strength of the southwest monsoon using boron isotopes in the eastern Arabian Sea
(American Geophysical Union, 2015)Here we present the first boron isotope-based pCO<sub>2</sub><sup>sw</sup> (pCO<sub>2</sub> of seawater) reconstruction from the eastern Arabian Sea using the planktic foraminifera species Globigerinoides ruber. Our results ... -
Use of the Boron partition coefficient ‘K<sub>D</sub>’ and B/Ca from planktonic foraminifera in the estimation of past seawater pCO<sub>2</sub>
(Geochemical Society of Japan, 2015)We assess the usefulness of the empirical boron partition coefficient, K<sub>D</sub> and B/Ca measured from planktonic foraminifera in estimation of pCO<sub>2</sub> using three different relationships between K<sub>D</sub> ... -
δ<sup>18</sup>O and salinity variability from the last glacial maximum to recent in the Bay of Bengal and Andaman Sea
(Elsevier, 2016)Oxygen isotopes of surface, thermocline and bottom dwelling foraminifera were analysed from two well-dated Andaman Sea cores and combined with nine previously published records from the Bay of Bengal (BoB) and Andaman Sea ...