Coupling between suboxic condition in sediments of the western Bay of Bengal and southwest monsoon intensification: A geochemical study

Pattan, J.N.; Mir, Ishfaq Ahmad; Parthiban, G.; Karapurkar, Supriya G.; Matta, V.M.; Naidu, Pothuri Divakar; Naqvi, S.W.A.

doi:10.1016/j.chemgeo.2013.02.011

Cited by 41 publications

(9 citation statements)

References 85 publications

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“…Enhanced overhead productivity leads to greater organic matter export to the sediments. C/N ratios has been extensively used to decipher the provenance of organic matter, i.e., values of C/N ≤12 and C/N ≥12 suggests provenance of marine and terrestrial origin of OC respectively (Hedges and Parker, 1976;Emerson and Hedges, 1988;Meyers, 1997;Bhushan et al, 2001;Pattan et al, 2013). The C/N ratio in the present study varies from 9 to 17 with an average of 12.…”

Section: Evidence Of Anoxic Bottom Waters At Lgmmentioning

confidence: 87%

“…The redox conditions at the sediment-water interface is mainly controlled by bottom water oxic conditions influenced by deep water circulation and increased oxygen demand for enhanced OC supply and its degradation (Pattan and Pearce, 2009;Pattan et al, 2013). Enhanced overhead productivity leads to greater organic matter export to the sediments.…”

Section: Evidence Of Anoxic Bottom Waters At Lgmmentioning

confidence: 99%

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Evidence of Poor Bottom Water Ventilation during LGM in the Equatorial Indian Ocean

2017

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Multi-proxy approach for the reconstruction of paleo-redox conditions is attempted on a radiocarbon ( 14 C) dated sediment core near the equatorial Indian Ocean. Based on the behavior and distribution of redox sensitive and productivity proxies, study demonstrates prevalence of anoxic bottom water conditions during LGM due to poorly ventilated bottom waters augmented by high surface productivity resulting in better preservation of organic carbon (OC). During early Holocene, the equatorial Indian Ocean witnessed high sedimentation rates resulting in high organic carbon (OC) with depleted redox sensitive elements thereby causing better preservation of OC. The study underscores poor bottom water ventilation during LGM and preservation of OC as a result of high sedimentation rate in early Holocene.

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Section: Evidence Of Anoxic Bottom Waters At Lgmmentioning

confidence: 87%

Section: Evidence Of Anoxic Bottom Waters At Lgmmentioning

confidence: 99%

Evidence of Poor Bottom Water Ventilation during LGM in the Equatorial Indian Ocean

2017

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“…The concentrations of other palaeoenvironmental proxies (e.g., Acharya, Panigrahi, Gupta, & Tripathy, 2015;Pattan et al, 2013;Śliwiński et al, 2010) such as Al, Si, P, Fe, Mn, Ce/Ce*, and REE are summarised in Table 1, and their profiles ( Figure 5) exhibit distinct variations associated with the stratigraphic interval that spans the peak of the HERB event (Azmy, 2018).…”

Section: Element Analysismentioning

confidence: 99%

Palaeoenvironmental changes in slope carbonates across the Late Cambrian–Early Ordovician in western Newfoundland

Wang

Azmy

2019

Geological Journal

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The Martin Point section (western Newfoundland, Canada) spans the uppermost Cambrian Broom Point and Martin Point members of the Green Point Formation (upper Furongian). The investigated interval (~90 m) consists of rhythmites of thinly-bedded marine carbonates (lime mudstones) alternating with green and black shale and thin conglomerate beds. Samples were extracted from the micritic carbonates, and their preservation was evaluated by multiple petrographic and geochemical examinations. The δ 13 C org profile exhibits a positive shift (~2‰) associated with the globally well-documented negative δ 13 C carb HERB (Hellnmaria-Red Tops boundary) excursion and correlated with similar distinct shifts in the Al, Si, and ∑REE components, thus suggesting contributions from detrital organic matter relatively depleted in 12 C induced likely by a eustatic sea-level drop and enhancement of terrigenous inputs. Similarly, the δ 15 N org variations are consistent with the proposed sea-level drop. This is also correlated with positive shifts on the Fe and Mn profiles reflecting the overprint of terrigenous inputs rather than redox conditions.

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“…Studies on behavior of these metals in suboxic and anoxic bottom water condition have been conducted in several sedimentary records, such as for the gulf of California (Brumsack, 1989), Black Sea (Anderson et al, 1989;Brumsack, 1989;Colodner et al, 1995), Cariaco Basin (Lyons et al, 2003;Piper and Dean, 2003), Gulf of Mexico (Swarzenski et al, 2008), Peru and Chilean Margins (Böning et al, 2004(Böning et al, , 2005, Arabian Sea (van der Weijden et al, 2006;Pattan and Pearce, 2009) and Bay of Bengal (Pattan et al, 2013). A number of geochemical techniques have been used as indices of redox condition in recent sediments and sedimentary rocks.…”

Section: Introductionmentioning

confidence: 99%

Response of trace metal redox proxies in continental shelf environment: The Eastern Arabian Sea scenario

Acharya

Panigrahi

Gupta

et al. 2015

Continental Shelf Research

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Coupling between suboxic condition in sediments of the western Bay of Bengal and southwest monsoon intensification: A geochemical study

Cited by 41 publications

References 85 publications

Evidence of Poor Bottom Water Ventilation during LGM in the Equatorial Indian Ocean

Evidence of Poor Bottom Water Ventilation during LGM in the Equatorial Indian Ocean

Palaeoenvironmental changes in slope carbonates across the Late Cambrian–Early Ordovician in western Newfoundland

Response of trace metal redox proxies in continental shelf environment: The Eastern Arabian Sea scenario

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