Diagenesis of magnetic minerals in a gas hydrate/cold seep environment off the Krishna–Godavari basin, Bay of Bengal

Dewangan, P.; Basavaiah, N.; Badesab, Firoz; Usapkar, A.; Mazumdar, Aninda; Joshi, R.; Ramprasad, T.

doi:10.1016/j.margeo.2013.04.016

Cited by 51 publications

(45 citation statements)

References 84 publications

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“…However, the S − 300 ratios of the two gray-colored samples are similar with those of the yellow-colored samples (97%) in terms of the N63 μm fraction (Table 3). These features are consistent with sediments subjected to reductive diagenesis, which leads to selected removal of ferrimagnetic minerals, with fine-grained ones removed first and the relative enrichment of antiferromagnetic minerals (Rowan et al, 2009;Ao et al, 2010;Mohamed et al, 2011;Dewangan et al, 2013).…”

Section: The Influence Of Diagenesis and Channel Geomorphological Changesupporting

confidence: 76%

“…Magnetic minerals, which can be sensitively characterized by magnetic measurements, are widespread in sediments. Therefore, magnetic properties of sediments have been used in the study of environmental processes, such as sediment tracing, hydrodynamic sorting and early diagenesis in a variety of environments (e.g., Bloemendal et al, 1988;Yu et al, 1990;Deng et al, 2004;Hatfield and Maher, 2008;Maher et al, 2009;Rowan et al, 2009;Ao et al, 2010;Hatfield et al, 2010;Mohamed et al, 2011;Dewangan et al, 2013). Among these studies, it has been found that particle size is an important factor affecting magnetic properties, even if the sediment source does not vary (Oldfield et al, 1985(Oldfield et al, , 2009Oldfield and Yu, 1994;Zhang and Yu, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Magnetic fingerprinting of hydrodynamic variations and channel erosion across the turbidity maximum zone of the Yangtze Estuary, China

Dong

Zhang

et al. 2014

Geomorphology

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Section: The Influence Of Diagenesis and Channel Geomorphological Changesupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Magnetic fingerprinting of hydrodynamic variations and channel erosion across the turbidity maximum zone of the Yangtze Estuary, China

Dong

Zhang

et al. 2014

Geomorphology

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“…Canfield & Berner (1987) observed that in anoxic sediments with high content of organic carbon the hydrogen sulphide produced during organoclastic sulphate reduction caused the dissolution of magnetite and formation of pyrite, which is a paramagnetic mineral giving magnetic susceptibility values of near-zero. Iron oxides after dissolution by hydrogen sulphide recombine to reduced forms of iron sulphides such as greigite and mackinawite that readily convert to the stable pyrite (Dewangan et al 2013;Zhang et al 2014). Given the low accumulation rates of organic matter in the Atlantic zone over the western Svalbard margin (M€ uller & Stein 2014;Sanchez-Vidal et al 2015), the presence of hydrogen sulphide is most probably an indicator of ongoing AOM.…”

Section: Magnetic Susceptibility and K/ti Recordsmentioning

confidence: 99%

Diagenetic disturbances of marine sedimentary records from methane‐influenced environments in the Fram Strait as indications of variation in seep intensity during the last 35 000 years

Sztybor

Rasmussen

2016

Boreas

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T. L. 2017 (April): Diagenetic disturbances of marine sedimentary records from methane-influenced environments in the Fram Strait as indications of variation in seep intensity during the last 35 000 years.The effect of seeping of methane on marine sediment records has been studied in four gravity cores from Vestnesa Ridge, Svalbard margin. The area shows acoustic signs in the form of flares indicating active methane gas seepage. For a better understanding of the timing and variability of the flux of methane in the past and the effects on potential proxies, a detailed study of the diagenetic processes that may affect the composition and structure of both sediments and foraminiferal shells is needed. Here we discuss deep-sea records from methane-influenced environments in three cores from an active and very heterogeneous seep-area (pockmark) and one core from outside the pockmark for background. The results include the distribution and stable isotopes of authigenic carbonates and of benthic and planktonic foraminifera, magnetic susceptibility, AMS-14 C dates, sedimentary data and biostratigraphy. Extremely low d 13 C values recorded in both benthic and planktonic foraminifera during the Bølling-Allerød interstadials indicate possible increased methane flux beginning at late Heinrich event H1. The recorded low values are mainly a result of diagenetic overprint by methane-derived authigenic carbonates. The d 18 O signals of authigenic carbonates are close to those of foraminiferal calcite and thus the d 18 O records remain a valid stratigraphical tool in methane seep sites, except in the case of severely encrusted samples. In addition, the records from the active pockmark show nearly constant values of low magnetic susceptibility in contrast to higher and more variable magnetic susceptibility values from the control station and other published records from normal sediments west of Svalbard. This phenomenon is probably caused by dissolution of magnetic minerals in the reducing environmental conditions of methane seep sediments, associated with anaerobic oxidation of methane and formation of paramagnetic minerals (pyrite). This process enables magnetic susceptibility to be used as a common diagnostic tool for identifying methane-related palaeo-reductive environments.

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“…Compensation by hydrogen carbonate induces authigenic precipitation of microbial dolomite (Roberts et al, 2004), Ca or Fe carbonate (Dewangan et al, 2013;Merinero et al, 2008;Solomon et al, 2014;Sun and Turchyn, 2014;Vorhies and Gaines, 2009;Wallmann et al, 2008), and other minerals (Tribovillard et al, 2013). generation produces a pH increase and additional alkalinity.…”

Section: Carbon Storage As Organic and Inorganic Marine Debris And Asmentioning

confidence: 99%

Climate engineering by mimicking natural dust climate control: the iron salt aerosol method

et al. 2017

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Abstract. Power stations, ships and air traffic are among the most potent greenhouse gas emitters and are primarily responsible for global warming. Iron salt aerosols (ISAs), composed partly of iron and chloride, exert a cooling effect on climate in several ways. This article aims firstly to examine all direct and indirect natural climate cooling mechanisms driven by ISA tropospheric aerosol particles, showing their cooperation and interaction within the different environmental compartments. Secondly, it looks at a proposal to enhance the cooling effects of ISA in order to reach the optimistic target of the Paris climate agreement to limit the global temperature increase between 1.5 and 2 • C.Mineral dust played an important role during the glacial periods; by using mineral dust as a natural analogue tool and by mimicking the same method used in nature, the proposed ISA method might be able to reduce and stop climate warming. The first estimations made in this article show that by doubling the current natural iron emissions by ISA into the troposphere, i.e., by about 0.3 Tg Fe yr −1 , artificial ISA would enable the prevention or even reversal of global warming. The ISA method proposed integrates technical and economically feasible tools.

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Diagenesis of magnetic minerals in a gas hydrate/cold seep environment off the Krishna–Godavari basin, Bay of Bengal

Cited by 51 publications

References 84 publications

Magnetic fingerprinting of hydrodynamic variations and channel erosion across the turbidity maximum zone of the Yangtze Estuary, China

Magnetic fingerprinting of hydrodynamic variations and channel erosion across the turbidity maximum zone of the Yangtze Estuary, China

Diagenetic disturbances of marine sedimentary records from methane‐influenced environments in the Fram Strait as indications of variation in seep intensity during the last 35 000 years

Climate engineering by mimicking natural dust climate control: the iron salt aerosol method

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