Contrasting sulfidization in the turbidite and hemipelagic sediments of Bengal Fan

Volvoikar, Samida P.; Mazumdar, Aninda; Peketi, A.; Dewangan, P.; Sawant, Bhawesh T.; Manaskanya, Ayusmati; Goswami, Haimanti; Das, Debasis; Pujari, S.

doi:10.1016/j.marpetgeo.2020.104408

Cited by 13 publications

(7 citation statements)

References 74 publications

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“…The sediments of interest here are enriched in organic matter and iron (oxy)(hydr)oxides, Fe 2+ , and sulfides and/or sulfate as discussed above. In such closed system conditions, rapid porewater

{\mathrm{S}\mathrm{O}}_{4}^{2-}

consumption via OSR (Berelson et al., 2019; Burdige, 2006; Claypool, 2004; X. Liu et al., 2019; Shaw & Meyers, 1996; Thomson et al., 1993, 1998; Volvoikar et al., 2020) leads to pore water

{\mathrm{S}\mathrm{O}}_{4}^{2-}

depletion and production of dissolved HS − (e.g., Canfield, 2001). Due to the relatively high stock of reactants, abundant Fe 2+ and HS − can be supplied and favor iron monosulfide formation (Figure 11c).…”

Section: Discussionmentioning

confidence: 99%

Greigite Formation Modulated by Turbidites and Bioturbation in Deep‐Sea Sediments Offshore Sumatra

et al. 2022

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Greigite (Fe 3 S 4 ), the thiospinel of iron, is strongly ferrimagnetic. It can form as a precursor to pyrite (FeS 2 ) during sulfidic or methanic diagenesis in anoxic sedimentary environments (see review by Roberts et al. [2011]), or as magnetosome nanoparticles produced by magnetotactic bacteria in sulfidic aquatic environments (see review by Kopp and Kirschvink [2008]). The authigenic pathway involves two complex biogeochemical processes: that is, organoclastic sulfate reduction (OSR) or anaerobic oxidation of methane (AOM), as well as iron (oxy)(hydr)oxide

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{\mathrm{S}\mathrm{O}}_{4}^{2-}

consumption via OSR (Berelson et al., 2019; Burdige, 2006; Claypool, 2004; X. Liu et al., 2019; Shaw & Meyers, 1996; Thomson et al., 1993, 1998; Volvoikar et al., 2020) leads to pore water

{\mathrm{S}\mathrm{O}}_{4}^{2-}

Section: Discussionmentioning

confidence: 99%

Greigite Formation Modulated by Turbidites and Bioturbation in Deep‐Sea Sediments Offshore Sumatra

et al. 2022

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“…15C). Recognition of this process in the subsurface may be difficult (Volvoikar et al, 2020). Therefore, it may be challenging to distinguish thick intervals of rapidly accumulated turbidite fines from those of slowly accumulated pelagic or hemipelagic sediments, and thus to establish accurate sedimentation rates in trench-slope basin fills (e.g., Boulesteix et al, 2019).…”

Section: Allogenic Vs Autogenic Influences On Confined Lobe Complex Stacking Patternsmentioning

confidence: 99%

Deformation–sedimentation feedback and the development of anomalously thick aggradational turbidite lobes: Outcrop and subsurface examples from the Hikurangi Margin, New Zealand

McArthur

Bailleul²,

Mahieux

et al. 2021

Journal of Sedimentary Research

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Concepts of the interaction between autogenic (e.g., flow process) and allogenic (e.g., tectonics) controls on sedimentation have advanced to a state that allows the controlling forces to be distinguished. Here we examine outcropping and subsurface Neogene deep-marine clastic systems that traversed the Hikurangi subduction margin via thrust-bounded trench-slope basins, providing an opportunity to examine the interplay of structural deformation and deep-marine sedimentation. Sedimentary logging and mapping of Miocene outcrops from the exhumed portion of the subduction wedge record heavily amalgamated, sand-rich lobe complexes, up to 200 m thick, which accumulated behind NE–SW-oriented growth structures. There was no significant deposition from low-density parts of the gravity flows in the basin center, although lateral fringes demonstrate fining and thinning indicative of deposits from low-density flows. Seismic data from the offshore portion of the margin show analogous lobate reflector geometries. These deposits accumulate into complexes up to 5 km wide, 8 km long, and 300 m thick, comparable in scale with the outcropping lobes on this margin. Mapping reveals lobe complexes that are vertically stacked behind thrusts. These results illustrate repeated trapping of the sandier parts of turbidity currents to form aggradational lobe complexes, with the finer-grained suspended load bypassing to areas downstream. However, the repeated development of lobes characterized by partial bypass implies that a feedback mechanism operates to perpetuate a partial confinement condition, via rejuvenation of accommodation. The mechanism proposed is a coupling of sediment loading and deformation rate, such that load-driven subsidence focuses stress on basin-bounding faults and perpetuates generation of accommodation in the basin, hence modulating tectonic forcing. Recognition of such a mechanism has implications for understanding the tectono-stratigraphic evolution of deep-marine fold and thrust belts and the distribution of resources within them.

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“…However, in a recent study based on sulphur speciation and isotope ratios of core MD161/29 (Volvoikar et al, 2020) collected near core MD17&18 (Fig. 1) no dominant influence of diagenesis on km values could be observed.…”

Section: Changes In Sediment Sourcesmentioning

confidence: 78%

“…The cubes for the AMS were then taken in one of these 5 "halfsections" and oriented in the same way as for the MD12-3417 core. (Volvoikar et al, 2020) mentioned in this article. The map shows the physiography of the Ganges-Brahmaputra sedimentary system, from the catchment to the deep-sea fan (Fauquembergue et al, 2019).…”

Section: Anisotropy Of Magnetic Anisotropy (Ams)mentioning

confidence: 85%

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Magnetic fabric of Bengal fan sediments: Holocene record of sedimentary processes and turbidite activity from the Ganges-Brahmaputra river system

et al. 2020

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We present here a study based on the Anisotropy of Magnetic Susceptibility (AMS) and magnetic mineralogy carried out on the composite core MD17&18taken from the eastern levee of the active channel of the middle Bengal Fan in the Indian Ocean. Based on C-14 dating, the sedimentary sequence covers 9.8 ka in 39 m of sediment. It therefore records at very high resolution the variations in continental material exported to the ocean by the Ganges-Brahmaputra river system during the Holocene.This sequence was divided into two units according to turbidite activity: Unit 1 from 9.8 to 9.2 ka cal. BP representing 39 m of coarse-grained turbidite sequences (coarse silts to fine sands) and extremely high sedimentation rates. Unit 2 of 9.2 ka cal. BP to the present characterized by a sharp decrease in the sedimentation rate, the presence of fine-grained turbidites characterized by strong decrease in the ln(Ti/Ca) ratio.Our AMS results indicate that the magnetic fabric is highly sensitive to the mode of deposition. The turbidite sequences are clearly characterized by very high F and Pj values, not only of the coarse-grained turbidite levels in unit 1, but also of the fine turbidites in unit 2. We suggest that this strong degree of anisotropy is the result of the strong and rapid deposition during the turbidite sequences which induces an additional compaction effect.Furthermore, low temperature SIRM measurements revealed that the magnetic minerals representative of the Ganges and Brahmaputra drainage area are magnetite, hematite and goethite. A higher supply in fine-grained magnetite was observed during the turbidite sequences in phase with an increase in sediment grain size.

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Contrasting sulfidization in the turbidite and hemipelagic sediments of Bengal Fan

Cited by 13 publications

References 74 publications

Greigite Formation Modulated by Turbidites and Bioturbation in Deep‐Sea Sediments Offshore Sumatra

Greigite Formation Modulated by Turbidites and Bioturbation in Deep‐Sea Sediments Offshore Sumatra

Deformation–sedimentation feedback and the development of anomalously thick aggradational turbidite lobes: Outcrop and subsurface examples from the Hikurangi Margin, New Zealand

Magnetic fabric of Bengal fan sediments: Holocene record of sedimentary processes and turbidite activity from the Ganges-Brahmaputra river system

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