Hydrothermal signature in ferromanganese oxide coatings on pumice from the Central Indian Ocean Basin

Kalangutkar, Niyati G.; Iyer, Sridhar D.; Mascarenhas‐Pereira, M.B.L.; Nath, B. Nagender

doi:10.1007/s00367-015-0402-x

Cited by 15 publications

(3 citation statements)

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“…The role of the Indrani fracture zone cannot be ruled out as a potential source of hydrothermal inputs to the sediment. Equivalent examples exist in the southern areas of the CIOB where fracture zones have contributed Fe‐Mn oxides to the crusts (Iyer, ) and pumice substrate (Kalangutkar et al, ) were possibly responsible for shard formation (Mascarenhas‐Pereira et al, ) and hydrothermally altered the sediments (Nath et al, ).…”

Section: Discussionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

“…In particular, the role of hydrothermal inputs on sediment composition is little known for this region. Hydrothermal input in the formation of ferromanganese oxide coating over pumice clasts of the CIOB was recently reported in the region between 7°S and 15°S (Kalangutkar et al, ).…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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“…The presence of a large volcanic province in the CIOB is attested by the extensive occurrence of basalts, spilites, pumice and glass shards that are of 60 Ma to recent times (Iyer and Sudhakar, 1995). In addition, there are hydrothermal signatures present on FeMn crusts occurring near 76°30′E FZ (Iyer, 1991) and on FeMn coated pumice (Kalangutkar et al, 2015). The hydrothermal activities that occurred near seamounts range in age from 625 to 10 ka (Iyer et al, 1997a(Iyer et al, , 1999.…”

Section: Volcanic-hydrothermal Activities In the Ciobmentioning

confidence: 99%

Fluid‐driven Hydrovolcanic Activity along Fracture Zones and near Seamounts: Evidence from Deep‐sea Fe‐rich Spherules, Central Indian Ocean Basin

Amonkar

Iyer

Babu

et al. 2021

Acta Geologica Sinica (Eng)

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An insight on occurrence of Fe-rich spherules from the Central Indian Ocean Basin (CIOB) provides an understanding of their distribution at a water depth of >5,000 m. In the present study, Fe-rich spherules are identified to occur in two different sediment types (i.e., siliceous and pelagic) and tectonic settings (i.e. near seamounts and fracture zones). These are single spheres or aggregates, of different sizes (63 to 390 µm) and show textural variability (smooth/ quenched, brickwork, corkscrew, interlocking and dendritic). A comparative study based on physical morphology and chemical composition suggests a common mechanism of formation. The association of spherules with fracture zones (FZ) and seamounts signifies that morpho-tectonic features play an important role in fluid-driven hydrovolcanism. Based on the evidence and geologic conditions existing in the basin, we conclude that molten fuel-coolant interaction (MFCI) coupled with submarine hydrothermal exhalations could be an ideal mechanism for the formation of spherules and Fe-particles. The accretion of the spherules on the surface sediments could be a result of recent volcanic phenomena, while those occurring at different depths (280-355, and 460-475 cm-bsf) within the sediment core indicate two different episodes. The study provides a global implication in understanding fluid-driven magmatism in a deep-sea intraplate environment.

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Biogeochemical Characteristics of Hydrothermal Systems in the Indian Ocean

Prakash

Fernandes

Ingole

et al. 2022

Systems Biogeochemistry of Major Marine Biomes

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Hydrothermal signature in ferromanganese oxide coatings on pumice from the Central Indian Ocean Basin

Cited by 15 publications

References 51 publications

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

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

Fluid‐driven Hydrovolcanic Activity along Fracture Zones and near Seamounts: Evidence from Deep‐sea Fe‐rich Spherules, Central Indian Ocean Basin

Biogeochemical Characteristics of Hydrothermal Systems in the Indian Ocean

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