Lava – substrate interaction: Constraints on flow emplacement and basal sintering, Lebuj rhyolitic flow, Tokaj Mountains, Carpathian-Pannonian region

Szepesi, János; Vona, Alessandro; Kovàcs, István; Fintor, Krisztián; Molnár, Kinga; Scarani, Alex; Giordano, Guido; Lukács, Réka

doi:10.1016/j.jvolgeores.2023.107878

Cited by 1 publication

(1 citation statement)

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“…2 ). Furthermore, any model implying wholesale ascent of coherent magma within the dyke interior would require high shear stresses at the conduit wall, at the pLT contact, which would drive pLT deformation and further compaction 41 . The absence of such deformation thus supports the cryptic fragmentation model (Fig.…”

Section: Resultsmentioning

confidence: 99%

Evidence for the formation of silicic lava by pyroclast sintering

Foster,

Wadsworth,

Tuffen

et al. 2024

Nat Commun

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Silicic lavas can be produced by the sintering of pyroclasts in the volcanic sub-surface, and then advected out of the vent. Here, we provide evidence for this mechanism preserved in the exposed post-glacial remnants of a silicic volcanic conduit at Hrafntinnuhryggur, Krafla volcano, Iceland. We show that the conduit margins are a clast-supported pumice lapilli tuff deposit that grades continuously into dense obsidian and that the obsidian contains cuspate relict clast boundaries and country rock lithic fragments throughout. Transects of H2O concentrations across the conduit show that the magma was degassed to different degrees laterally with systematic spatial variation that is consistent with progressive conduit clogging and final gas pressurisation. Textures in the overlying effusive lavas record the variably sheared and brecciated remnant of the same in-conduit sintering. This record of a silicic conduit system connected to upper eruptive deposits provides support for the ‘cryptic fragmentation model’ for effusive silicic volcanism.

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Section: Resultsmentioning

confidence: 99%