Record of carbonate preservation and the <scp>M</scp>id‐<scp>B</scp>runhes climatic shift from a seamount top with low sedimentation rates in the <scp>C</scp>entral <scp>I</scp>ndian <scp>B</scp>asin

Nath, B. Nagender; Sijinkumar, A.V.; Borole, D.V.; Gupta, Sandeep K.; Mergulhao, Lina P.; Mascarenhas‐Pereira, M.B.L.; Ramaswamy, V.; Guptha, M.V.S.; Possnert, Göran; Aldahan, Ala; Khadge, N.H.; Sharma, Rahul

doi:10.1111/j.1502-3885.2012.00304.x

Cited by 14 publications

(5 citation statements)

References 50 publications

(89 reference statements)

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“…An intense erosion of the younger sediments in the CIB as a consequence of Antarctic Bottom Water has also been reported (Banakar et al, 1998). The sedimentation rates in the basin are about 2 mm/kyr and mostly <1 cm/kyr (Banakar et al, 1998;Borole, 1993;Mascarenhas-Pereira et al, 2016;Nath et al, 2013).…”

mentioning

confidence: 83%

“…The formation of polyphosphate and subsequent transformation to nonmetabolizable organic P such as phosphate esters and phosphonates results in enrichment of P org relative to C org (Dale et al, 2016, and references therein). Thus, the low C org /P org ratios in some of our sediments are likely due to extensive degradation of organic matter coupled with low sedimentation rates in the area (Borole, 1993;Nath et al, 2013) and long exposure to oxygen (Nath et al, 2012). These factors may have resulted in an in situ formation of nonmetabolizable P org via polyphosphate intermediate and residual P org .…”

Section: Journal Of Geophysical Research: Oceansmentioning

confidence: 97%

“…Along with this high bottom water phosphate (~3 μmol/L) and low sedimentation rate can fuel the adsorption process (Ni et al, 2015). The clay-sized sediment content in the area is high (up to 81% by weight; Biche et al, 2017) and the sedimentation rates in the CIB are extremely low (2-3 mm/kyr, rarely exceeding 1 cm/kyr; Banakar et al, 1998;Borole, 1993;Mascarenhas-Pereira et al, 2016;Nath et al, 2013) typical of deep-sea pelagic sediments. Thus, finegrained sediments with very low sedimentation rates in the CIB promote the adsorption of P, and this adsorbed fraction could be an important sink of P from the water column.…”

Section: 1029/2018jc014386mentioning

confidence: 99%

“…The CIB sediments are mainly composed of siliceous, terrigenous, and pelagic red clays with the presence of calcareous sediments in areas near to the ridge Rao & Nath, 1988) and on shallow seamount tops (e.g., Nath et al, 2013). The turbiditic currents in the north disperse the sediments to the south into the basin and signatures of terrigenous sediment supply can be traced up to 8°S in the CIB Nath, Balaram, et al, 1992).…”

Section: Sediments and Oceanographic Settings Of The Study Areamentioning

confidence: 99%

“…Rajeev et al (2000) attributed this to a combination of aerosol transport through the western and eastern parts of the tropical Indian Ocean, sea salt production due to high wind speed, and transport of Australian dust. Increased deposition of clay-sized sediments together with a concomitant increase in kaolinite content in the CIB, during the periods of the prevalence of arid conditions in Australia, has been attributed to the wind deposition (Nath et al, 2013). Kaolinite-rich dust from western Australia is blown into the eastern Indian Ocean (Fagel, 2007;Griffin et al, 1968) as a result of the prevailing easterly winds (Gingele et al, 2001;McTainsh, 1989).…”

Section: 1029/2018jc014386mentioning

confidence: 99%

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Distribution and Diagenesis of Phosphorus in the Deep‐Sea Sediments of the Central Indian Basin

et al. 2018

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A regional solid‐phase phosphorus (P) speciation study in the Central Indian Basin (CIB) was carried out to elucidate the spatial distribution of sedimentary P species and P diagenesis in an oligotrophic setting. The results show that P enrichment is in the order of biogenic (Pbio) > authigenic (Pauth) > iron bound (PFe) > detrital (Pdet) > organic (Porg) P. The higher concentrations of Pbio are found in siliceous oozes, which are attributed to high biological productivity in the overlying waters compared to pelagic clay region. High Pauth and Pdet contents with low molar Corg/Preact ratios in the pelagic/red clays indicate the deposition of calcium fluorapatite and refractory material from the atmospheric input. The oxygenated bottom water promotes adsorption of P onto iron oxyhydroxides making the PFe an important sink. Remobilization of P within the sediments is limited because of well‐oxygenated conditions and an efficient adsorption by iron oxyhydroxides and clay‐sized sediments. A twofold increase in Ptotal and P‐species is observed in hydrothermally altered, ferruginous sediments from a seamount flank suggesting an important role of hydrothermal processes in P cycling. The calculated P accumulation rate in the present study ranges between 0.6 and 11.7 μmol·cm−2·kyr−1. The burial flux of P for the entire CIB (5.7 × 106 km2) is 0.01 × 1010 mol P per year which accounts for 0.05% of the global flux. The benthic P fluxes from the seawater to the sediments in the area range between 0.0093 and 0.133 μmol·cm−2·kyr−1 indicating that the CIB sediments are an important sink for P.

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mentioning

confidence: 83%

Section: Journal Of Geophysical Research: Oceansmentioning

confidence: 97%

Section: 1029/2018jc014386mentioning

confidence: 99%

Section: Sediments and Oceanographic Settings Of The Study Areamentioning

confidence: 99%

Section: 1029/2018jc014386mentioning

confidence: 99%

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Distribution and Diagenesis of Phosphorus in the Deep‐Sea Sediments of the Central Indian Basin

et al. 2018

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Hydrothermal Alteration Promotes Humic Acid Formation in Sediments: A Case Study of the Central Indian Ocean Basin

et al. 2018

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Anomalously high concentrations of humic‐rich dissolved organic matter (DOM) in extant submarine hydrothermal vent plumes traveled far from source are increasingly being reported. This DOM, able to mobilize trace metals (e.g., Fe2+) has been hypothesized as originating from organic matter produced by thermogenic bacteria. To eliminate a possible abiogenic origin of this DOM, study is required of well‐preserved organic compounds that can be attributed to thermogenic bacteria. The Central Indian Ocean Basin (CIOB) is part of a diffuse plate boundary and an intraplate deformation zone. Coarse fraction (>63 µ) characteristics, mineralogy, magnetic susceptibility, and geochemistry were examined in sediments of a core raised close to a north‐south fracture zone near the Equator. Two horizons of distinctly brown‐colored sediments were shown as hydrothermally altered from their charred fragments and geochemistry (CaCO3, Corg, Ti/Al, Al/(Al + Fe + Mn), Sr/Ba, Mg/Li, Mn micronodules, Fe/Mn). We examined whether humic substances were preserved in these sediments, and if so whether their carbon isotope distribution would support their hydrothermal origin. Alkali extraction of sediments afforded humic acids (HA) in yields up to 1.2% in the brown sediments. The remaining portions of the core had nil or low concentrations of HA. The carbon of hydrothermal HA is isotopically heavier (average δ13C, ∼ −16.3‰) compared to nonhydrothermal HA (–18.1‰), suggesting that they were probably formed from organic matter that remained after elimination of lighter carbon enriched functional groups during diagenesis. The results provide compelling evidence of HA formation from lipids originating from thermogenic bacteria.

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Change of lithofacies in marine sediment core from Quaternary to Pre-Quaternary: A case study from the Central Indian Ocean Basin

et al. 2020

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Record of carbonate preservation and the Mid‐Brunhes climatic shift from a seamount top with low sedimentation rates in the Central Indian Basin

Cited by 14 publications

References 50 publications

Distribution and Diagenesis of Phosphorus in the Deep‐Sea Sediments of the Central Indian Basin

Distribution and Diagenesis of Phosphorus in the Deep‐Sea Sediments of the Central Indian Basin

Hydrothermal Alteration Promotes Humic Acid Formation in Sediments: A Case Study of the Central Indian Ocean Basin

Change of lithofacies in marine sediment core from Quaternary to Pre-Quaternary: A case study from the Central Indian Ocean Basin

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