Critical carbonate levels in the Indian Ocean

Belyaeva, N. V.; Burmistrova, I. I.

doi:10.2113/gsjfr.15.4.337

Cited by 11 publications

(4 citation statements)

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“…Terrigenous sediments occur mostly in the northern and central parts of the area. Movement of Antarctic Bottom Water (AABW) has been reported in this area of the CIB (Johnson and Nigrini, 1982;Belyaeva and Burmistrova, 1985). In the present area (5~176 of high surface biological productivity, the carbonate lysocline associated with North Indian Deep Water (NADW) occurs at around 4,000 m depth, while the CCD exists at around 5,000 m (Belyaeva and Burmistrova, 1985).…”

Section: Oceanic Environment Of the Study Areamentioning

confidence: 76%

“…The observed inhomogeneity in bulk chemistry with respect to nodule morphology and depth of occurrence may be due to their variable sources of trace metal. The high biological productivity in the surface water of the study area (5~176 (Belyaeva and Burmistrova, 1985) could lead to an enhanced supply of organic matter to the bottom sediment. After burial and subsequent decay this organic matter creates a reducing environment (or low redox potential) in the sediment column, releasing and enhancing trace metal movement through sediment pore water toward the higher redox potential zone at the sediment water interface.…”

Section: Discussionmentioning

confidence: 99%

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Nature and distribution of manganese nodules from three sediment domains of the Central Indian Basin, Indian Ocean

Banerjee

Mukhopadhyay

1991

Geo-Marine Letters

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Abstract. Manganese nodules from the Central Indian Basin (5~176 vary in abundance, morphology, mineralogy, and chemistry with water depth and sediment type. Nodules from the southern region, dominated by siliceous sediment, differ markedly from northern and central regions, dominated by terrigenous and terrigenous-siliceous mixed sediments, respectively. Effects of iysocline and sediment diagenesis are envisaged for trace metal enrichment in rough nodules of the southern region. Influence of deep ocean bottom currents have been postulated for the atypical trace metal enrichment of the smooth nodules from other regions. While nodules from other areas of sub-equatorial CIB are grown hydrogenetically, present area nodules show diagenetic influence.

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Section: Oceanic Environment Of the Study Areamentioning

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Nature and distribution of manganese nodules from three sediment domains of the Central Indian Basin, Indian Ocean

Banerjee

Mukhopadhyay

1991

Geo-Marine Letters

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“…Areas where productivity of phytoplankton is considerably lower than that of planktonic foraminifera are common in modern oceans (e.g. Belyaeva & Burmistrova, ).…”

Section: Discussionmentioning

confidence: 99%

Planktonic foraminifer biostratigraphy as a tool in constraining the timing of flysch deposition: Gurnigel flysch, Voirons massif (Haute‐Savoie, France)

et al. 2013

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New biostratigraphic, sedimentological and petrographic data and a thorough review of existing literature modify existing knowledge on the age, the sedimentology, the petrography and the palaeogeographic origin of the Gurnigel flysch from the Voirons massif (Haute Savoie, France). Planktonic foraminiferal biostratigraphy assigns the flysch to the upper Middle Eocene (zones P12 to P14) through to Lower Oligocene (zones P16 to P20) stages. This result contrasts with previous work, which assigned the unit to the Lower Palaeocene to upper Middle Eocene on the basis of calcareous nannofossil and dinoflagellate assemblages. The following findings suggest that the Voirons massif comprises several stacked flysch units that do not have exactly the same palaeogeographic origin: (i) the occurrence of flysch exposures in reverse stratigraphic order combined with the lack of evidence for bed overturning; (ii) the variability of palaeo‐depositional settings inferred from different flysch outcrops of similar age; (iii) the differences in the heavy mineral content; and (iv) the anomalous superimposition of distal turbidites and/or basinal contourites (Saxel Marls) over proximal turbidites (Vouan Conglomerates). The young age of these kilometre‐sized flysch slices precludes their hitherto postulated locus of deposition in the South‐Penninic Ocean, and rather indicates a provenance from the Ultrahelvetic and/or North‐Penninic (Valais) palaeogeographical domains. Finally, none of the nannofossil assemblages are contemporaneous with the observed planktonic foraminifera associations, suggesting that they have been reworked, dissolved, or just simply diluted and not found by earlier researchers. This study from the Voirons massif shows that planktonic foraminifera associations are a highly reliable biostratigraphic tool for obtaining accurate ages of flysch successions.

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“…This study uses material collected during the Paleogene GLObal Warming events, “GLOW” cruise offshore Tanzania in the Western Indian Ocean (Kroon and the Shipboard Scientific Party, 2010). All sites on the cruise collected material that sat well above the carbonate compensation depth [CCD; 3,500–4,500 m (Bickert, 2009)] and lysocline [3,330 m (Belyaeva & Burmistrova, 1984; Ivanova, 2009]; and was composed of more than 30% clay leading to excellent well preserved planktic foraminifera (Kroon and the Shipboard Scientific Party, 2010). For this study, we focus on box core material collected at GLOW station 8 (from here on referred to as GLOW 8 (9 21’ 25.20” S; 40 35’ 27.60” °E) with a box corer with a diameter of 30 cm and height of 55 cm.…”

Section: Methodsmentioning

confidence: 99%

The Influence of Geochemical Variation Among Globigerinoides ruber Individuals on Paleoceanographic Reconstructions

Kearns

Searle-Barnes

Foster

et al. 2023

Paleoceanog and Paleoclimatol

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Variation among individuals within species is a biological precondition for co‐existence. Traditional geochemical analysis based on bulk averages facilitates rapid data gathering but necessarily means the loss of large amounts of potentially crucial information into variability within a given sample. As the sensitivity of geochemical analysis improves, it is now feasible to build sufficiently powerful datasets to investigate paleoclimatic variation at the level of individual specimens. Here, we investigate geochemical and morphological variation among the sensu stricto, sensu lato and sensu lato extreme subspecies of the workhorse extant planktic foraminifera Globigerinoides ruber. Our experimental design distinguishes between subspecies and intraspecific variability as well as the repeatability of laser ablation inductively coupled plasma mass spectrometry (LA‐ICP‐MS). We show that geochemical variability in Mg/Ca ratios is driven by differences in subspecies depth habitat and that ontogenetic trends in Mg/Ca ratios are evident in the final whorl, with the final chamber consistently showing depleted Mg/Ca. These ontogenetic trends are not driven by individual chamber or test size. The Mg/Ca value variance among individuals is ∼100 times higher than the variance among repeated laser spot analyses of single chambers, directing laboratory protocols towards the need to sample ecologically and environmentally homogeneous samples. Our results emphasize that we can use LA‐ICP‐MS to quantify how individual variability aggregates to bulk results, and highlights that, with sufficient sample sizes, it is possible to reveal how intraspecific variability alters geochemical inference.

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Critical carbonate levels in the Indian Ocean

Cited by 11 publications

References 0 publications

Nature and distribution of manganese nodules from three sediment domains of the Central Indian Basin, Indian Ocean

Nature and distribution of manganese nodules from three sediment domains of the Central Indian Basin, Indian Ocean

Planktonic foraminifer biostratigraphy as a tool in constraining the timing of flysch deposition: Gurnigel flysch, Voirons massif (Haute‐Savoie, France)

The Influence of Geochemical Variation Among Globigerinoides ruber Individuals on Paleoceanographic Reconstructions

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