Extending the limit of widespread dispersed Toba volcanic glass shards and identification of new in-situ volcanic events in the Central Indian Ocean Basin

Amonkar, Ankeeta; Iyer, Sridhar D.; Babu, E. V. S. S. K.; Manju, S.

doi:10.1007/s12040-020-01429-6

Cited by 6 publications

(1 citation statement)

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“…While in the southern core AAS-22/3, the CF% was high only in the top 35 cm and below 35 cm-bsf there was a relative decrease (2-3%). In general, the CF from Site-2 revealed an assemblage of components such as radiolarians, FeMn micronodules, basaltic glass, palagonite grains, volcanic glass shards, microtektites, pumice pieces, bread crust (oxidized basaltic glass), magnetic spherules, mica flakes and phillipsite crystals (Amonkar et al, 2017(Amonkar et al, , 2020. While, the detailed examination of CF (>63 µm) from Site -1 revealed the occurrence of FeMn micronodules, radiolarians and diatoms as the dominant phase together with spherules and volcanic glass shards.…”

Section: Sediment Characteristics and Coarse Fraction Descriptionmentioning

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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Section: Sediment Characteristics and Coarse Fraction Descriptionmentioning

confidence: 99%