Browsing by Subject "Geology and geophysics"
Now showing items 21-40 of 50
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Dynamics of polycyclic aromatic hydrocarbons (PAHs) in surface sediments of Cochin estuary, India
(Elsevier, 2017)Polycyclic aromatic hydrocarbons (PAHs) showed significant seasonal dynamics in surface sediments of a tropical ecosystem (Cochin estuary, south west coast of India). Concentrations ranged from 304 to 5874 ngg<sup>-1</sup> ... -
Effect of submarine canyons on tsunami heights, currents and run-up off the southeast coast of India
(Current Science Association, 2016)Tsunami numerical model studies are mostly focused on inundation and run-up onto the coast. Fewer studies have been aimed at investigating role of submarine canyons on the tsunami heights, currents and run-up. The influence ... -
Effects of bottom water dissolved oxygen variability on copper and lead fractionation in the sediments across the oxygen minimum zone, western continental margin of India
(Elsevier, 2016)This study describes the effect of varying bottom-water oxygen concentration on geochemical fractionation (operational speciation) of Cu and Pb in the underneath sediments across the oxygen minimum zone (Arabian Sea) in ... -
Effects of bottom water oxygen concentrations on mercury distribution and speciation in sediments below the oxygen minimum zone of the Arabian Sea
(Elsevier, 2016)This study investigated the influences of varying dissolved oxygen (DO) levels in overlying bottom water, sediment grain size, total sedimentary organic carbon (C<sub>org</sub>), and total sedimentary sulfide concentrations ... -
Estuarine and marine geology (2011-2015)
(Proceedings of the Indian National Science Academy, 2016)The estuaries of the Mandovi and Zuari (Ma-Zu) Rivers and Godavari River have been investigated extensively for understanding the sedimentary and bio-geochemical processes during the last 5 years. Estuarine turbidity maximum ... -
Extraterrestrial components from deep sea sediments of Indian Ocean
(Indian National Science Academy, 2016)Two different types of extraterrestrial particulate matter collections were undertaken during the last few years-by using magnets encased in dredges that were dragged along the seafloor and by sieving massive quantities ... -
First evidence of denitrification vis-a-vis monsoon in the Arabian Sea since late Miocene
(Nature Publishing Group, 2017)In the Arabian Sea, South Asian monsoon (SAM)-induced high surface water productivity coupled with poor ventilation of intermediate water results in strong denitrification within the oxygen minimum zone (OMZ). Despite the ... -
Gravity anomalies over the central Indian ridge between 3 degree S and 11 degree S, Indian Ocean: Segmentation and crustal structure
(Indian Academy of Sciences, 2016)High-resolution shipboard geophysical investigations along the Indian Ocean ridge system are sparse especially over the Carlsberg and Central Indian ridges. In the present study, the shipboard gravity and multibeam bathymetry ... -
In situ oxygen isotope compositions in olivines of different types of cosmic spherules: An assessment of relationships to chondritic particles
(Elsevier, 2016)Cosmic spherules collected from deep sea sediments of the Indian Ocean having different textures such as scoriaceous (4), relict-bearing (16), porphyritic (35) and barred olivine (2) were investigated for petrography, as ... -
Indian contributions in the field of marine micropaleontology (2010-2015)
(Indian National Science Academy, 2016)An overview of the research contributions made during the last five years by the Indian scientists in the field of marine micropaleontology is presented. Large scale micropaleontological studies employing assemblages of ... -
Influence of atmospheric dry deposition of inorganic nutrients on phytoplankton biomass in the coastal Bay of Bengal
(Elsevier, 2016)The aerosols from continents contain relatively higher amounts of inorganic nutrients than those of marine origin and can make a notable contribution to the coastal biological productivity. To test this hypothesis, the ... -
Integrated geophysical study off Goa, Central West Coast of India
(Indian Geophysical Union, 2016)The western Indian offshore is characterized by several tectonic elements along its entire length. The prominent ones include the Laxmi Ridge (LR) and the Chagos-Laccadive Ridge (CLR) in the north and south, respectively. ... -
Internal structure of the 85°E ridge, Bay of Bengal: Evidence for multiphase volcanism
(Elsevier, 2017)The 85°E Ridge, located in the Bay of Bengal of the northeastern Indian Ocean is an enigmatic geological feature as it possesses unusual geophysical signatures. The ridge's internal structure and mode of eruptions are ... -
Longshore sediment transport in the surf zone based on different formulae: A case study along the central west coast of India
(Springer, 2017)Understanding longshore sediment transport (LST) is a prerequisite for designing an effective coastal zone management strategy. The present study estimates the LST along the central west coast of India based on four bulk ... -
Middle cretaceous geomagnetic field anomalies in the eastern Indian Ocean and their implication to the tectonic evolution of the Bay of Bengal
(Elsevier, 2016)The Middle Cretaceous period is largely known for its stable normal polarity in the Earth's magnetic field. A few reversals (ISEA, M-3r; M-2r and M-1r) have been postulated during this period but are yet to be accepted in ... -
Multifractal detrended fluctuation analysis to compare coral bank and seafloor seepage area-related characterization along the central Western continental margin of India
(IEEE, 2016)In this letter, the characterization of two coral banks is initiated employing the multifractal detrended fluctuation analysis (MFDFA) for multibeam bathymetry and associated backscatter data. The seafloor roughness was ... -
Nature of suspended particles in hydrothermal plume at 3°40'N Carlsberg ridge: A comparison with deep oceanic suspended matter
(Current Science Association, 2017)Suspended matter from hydrothermal plume at 3◦40'N Carlsberg Ridge was studied for microtexture and geochemistry. Characteristics of these plume particles were compared with deep-oceanic particulates from different ... -
Observed salinity changes in the Alappuzha mud bank, southwest coast of India and its implication to hypothesis of mudbank formation
(Elsevier, 2017)Alappuzha mud bank draws special attention among the twenty-mud bank locations reported along the Kerala coast by its remoteness from riverine sources. Among several hypotheses proposed for the formation of mud bank, the ... -
Offshore sediments record the history of onshore iron ore mining in Goa State, India
(Elsevier, 2017)Environmental magnetic and geochemical analyses combined with 210Pb dating were carried out on a sediment core off Goa from Arabian Sea to reconstruct the sedimentation history of last three and a half centuries and to ... -
Perspectives on the terrestrial organic matter transport and burial along the land-deep sea continuum: Caveats in our understanding of biogeochemical processes and future needs
(Frontiers Media, 2016)The natural carbon cycle is immensely intricate to fully understand its sources, fluxes and the processes that are responsible for their cycling in different reservoirs and their balances on a global scale. Anthropogenic ...