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Prakash Babu, C.
- Phosphorus Accumulation Associated with Intense Diagenetic Metal-Oxide Cycling in Sediments along the Eastern Continental Margin of India
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Authors
Affiliations
1 Geological Oceanography Division, CSIR National Institute of Oceanography, Dona Paula, Goa 403 004, IN
1 Geological Oceanography Division, CSIR National Institute of Oceanography, Dona Paula, Goa 403 004, IN
Source
Current Science, Vol 113, No 03 (2017), Pagination: 473-478Abstract
Sequential phosphorus extractions were carried out to understand phosphorus cycling and enrichment in surface sediments along the eastern continental margin of India. Phosphorus associated with authigenic (Paut) and biogenic (Pbio) phases is high by a factor of 2-10 in the continental shelf sediments compared to slope and deep-sea sediments. Phosphorus associated with Fe oxides (PFe) is enriched by a factor of 2-5 in the continental slope and rise sediments (500-3000 m water depth) compared to shelf sediments. Fe-Mn oxy(hydroxides) formed during early diagenesis adsorb phosphate from the water column or pore waters, thereby enriching the PFe fraction in the continental slope sediments. These results are in contrast with those from the Arabian Sea, where wide and intense mid-depth oxygen minimum zone (150-1200 m water depth) releases PFe to pore waters and enhances Paut accumulation in the continental slope sediments.Keywords
Early Diagenesis, Metal-Oxide Cycling, Phosphorus Accumulation, Surface Sediments.Full Text
References
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- Pattan, J. N., Parthiban, G., Prakash Babu, C., Khadge, N. H., Paropkari, A. L. and Kodagali, V. N., A note on geochemistry of surface sediments from Krishna–Godavari basin, east coast of India. J. Geol. Soc. India, 2008, 71, 107–114.
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- Processes Controlling Enrichment of Transition Elements in the Surficial Sediments of the Western Bay of Bengal
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Authors
Affiliations
1 Geological Oceanography Division, CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, IN
1 Geological Oceanography Division, CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, IN
Source
Current Science, Vol 114, No 10 (2018), Pagination: 2161-2167Abstract
The processes leading to surficial enrichment of transition elements have been studied in continental slope and deep-sea sediments from the western Bay of Bengal (~500–4500 m water depth). The lower continental slope and rise (1800–3000 m) sediments are characterized by enrichment of Mn/Al ratios by 2–3 orders of magnitude and transition elements (Fe, Ni, Co, Cr and V) by a factor of 2–3 compared to the upper continental slope (500–1100 m) sediments. The occurrence of micronodules rich in Fe and Mn and elements associated with Mn-oxides, confirmed by scanning electron microscope and electron probe micro analysis, are responsible for the accumulation of transition elements in the lower continental slope sediments. The freshwater stratification, low carbonate productivity, fine grain size, low porosity, thin oxidized surficial layer and high sedimentation are conducive for diagenetic enrichment of Fe, Mn and elements associated with Mn-oxides in the lower slope sediments. The mid-depth oxygen minimum zone, resuspension and absence of oxidized surface layer enhance metal release to water column in the upper slope sediments. The oceanographic settings and high sedimentation rates control metal cycling in the Bay of Bengal sediments.Keywords
Diagenesis, Fe–Mn Micronodules, Oxygen Minimum Zone, Sedimentation, Transition Elements.Full Text
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- A Significant Shift in Particulate Organic Matter Characteristics during Flooding of River Krishna, Eastern Peninsular India
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Authors
Affiliations
1 CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, IN
2 A-6, Oceanis Society, Bambolim, Goa 403 202, IN
3 Flat No. 502, First Block, Kamat Riviera, Caranzalem, Goa 403 002, IN
4 CSIR-National Institute of Oceanography, Regional Centre, Visakhapatnam 530 017, IN
5 National Institute of Animal Biotechnology, Hyderabad 500 049, IN
1 CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, IN
2 A-6, Oceanis Society, Bambolim, Goa 403 202, IN
3 Flat No. 502, First Block, Kamat Riviera, Caranzalem, Goa 403 002, IN
4 CSIR-National Institute of Oceanography, Regional Centre, Visakhapatnam 530 017, IN
5 National Institute of Animal Biotechnology, Hyderabad 500 049, IN
Source
Current Science, Vol 118, No 3 (2020), Pagination: 461-467Abstract
Extremely heavy rainfall over a small, semi-arid section of the Indian Peninsula in October 2009, together with release of water from dams resulted in very severe flooding in River Krishna. The sources and type of organic matter during and after the floods were studied by analysing suspended particulate matter (SPM) for organic carbon (C), total nitrogen (N) and isotopic composition of C (δ13Corg). The δ13Corg varied from –21.4‰ during the initial heavy flood phase to –27.1‰ in the final receding phase. Discharge of terrestrial carbon (–21.4‰ to –23.5‰) from mixed sources with high C/N ratios (14–19) during the initial phase of the flood originated from the semi-arid section of the river. The light carbon (–25.5‰ to –27.1‰) with low C/N ratios (7.2–9.5) in the receding phase of the flood was from local C3-rich organic debris from the deltaic regions along with phytoplankton from aquatic sources. Since the average suspended sediment discharge of River Krishna has decreased from 68 mt to less than 0.1 mt due to construction of dams and barrages, it appears that sediments and organic matter presently being delivered to the oceans are mainly during flood events, and the type of organic matter delivered depends on the nature of the soil where high rainfall is received.Keywords
Carbon Isotopes, Extreme Rainfall Events Rivers, Floods, Particulate Organic Matter.Full Text
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