Genesis of Central Indian Ocean basin seamounts: morphological, petrological, and geochemical evidence

Iyer, Sridhar D.; Amonkar, Ankeeta; Das, P.

doi:10.1007/s00531-018-1612-z

Cited by 7 publications

(3 citation statements)

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“…In the CIOB the presence of siliceous and pelagic sediments, occurrence of MORB (on the seafloor and at seamounts) (Das et al, 2007;Iyer et al, 2018), and hydrothermal material at sites SS2/89, SS10/657 and SS2/94 (Fig. 1) (Iyer et al, 1997a(Iyer et al, , b, 1999b); all of these indicate a condition similar to the field experiments discussed above.…”

Section: Formational Process Of Fe-rich Spherulessupporting

confidence: 58%

“…This was inferred to be due to addition of magmatic mass from subsequent eruptions along FZ and indicated multiple volcanic episodes (Das et al, 2007). This is borne out by the occurrence of relatively fresh basalts on the seamounts, compared to the surrounding seafloor and suggests volcanism to have been active even after the emplacement of seamount that took place several million years ago (Iyer et al, 2018).…”

Section: Geological Setting Of Seamounts (Site-1)mentioning

confidence: 99%

“…The 79°E FZ has a throw of 100 m to the east (Kamesh Raju et al, 1993) and there are several seamounts at its southern end (Das et al, 2007). Some of these seamounts show additions of magmatic material post formation (Iyer et al, 2018).…”

Section: Geological Setting Of Fracture Zone (Fz) (Site-2)mentioning

confidence: 99%

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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: Formational Process Of Fe-rich Spherulessupporting

confidence: 58%

Section: Geological Setting Of Seamounts (Site-1)mentioning

confidence: 99%