Basaltic dyke eruptions at Piton de La Fournaise: characterization of the eruptive products with implications for reservoir conditions, conduit processes and eruptive dynamics

Abstract

Acknowledgments We thank A. J. L. Harris and G. Boudoire for the syn-eruptive sampling of the July 2015 products, J-L. Devidal and J-M. Hénot for their precious support in using the electronic microprobe and the SEM, and M. Benbakkar for the bulk rock analysis. We thank M.D. Higgins and L. Pioli with whom we had constructive discussions. This paper was greatly improved by the critical review of the anonymous reviewer and the editor. We thank the STRAP project funded by the Agence Nationale de la Recherche (ANR-14-CE03-0004-04). This research was financed by the French Government Laboratory of Excellence initiative no. ANR-10-LABX-0006, the Région Auvergne and the European Regional Development Fund. This is Laboratory of Excellence Clervolc contribution number 401.

Magma fragmentation and particle size distributions in low intensity mafic explosions: the July/August 2015 Piton de la Fournaise eruption

“…It is therefore not possible to directly compare the PdF 2015 GSDs with similar scale explosions. Particle data determined for higher intensity Stromboli explosions via thermal image analysis 34 and now computed in terms of Mdϕ and sorting and are shown alongside the PdF data, displaying a finer median particle size than determined for the PdF explosions but spanning the same range of sorting (Fig. 5).…”

“…4), particle volume was calculated by multiplying the particle area by the minimum Feret diameter 72 and converted to a mass given the scoria density. Given the density distribution available and the size range of the particles considered, which is much larger than the size of the vesicles in the scoria 34 , the density variations are neglected. The full grain size distribution data for explosions 2 and 6 are provided as supplementary material.…”

“…Although small-scale activity has been documented by several geophysical and textural studies 8,[30][31][32][33][34][35] little is known about the specific dynamics of all these fragmentation regimes, specifically what controls their stability and their transitions. For this reason, it is not possible to relate specific particle size distributions to eruption dynamics, and the size distributions of particles generated at the vent are themselves considered as eruption source parameters 36,37 (i.e.…”

Chemical, Textural and Thermal Analyses of Local Interactions Between Lava Flow and a Tree – Case Study From Pāhoa, Hawai’i

“…Most of the samples show an enrichment in vesicle size between 2 and 3 mm. TOP1 has seen a coalescence phenomenon which explains the depletion in the 2-3 mm range and increase > 5 mm (Thivet et al, 2020a).…”

“…CSDs can be divided into at least three crystal families (microlites, micro-phenocrysts and phenocrysts in Figure 7), following the terminology of Gurioli et al (2014) and Salisbury et al (2008), where crystals of plagioclase in size ranges < 0.11 mm, 0.11-1.2 mm and > 1.2 mm are considered to be microlites, microphenocrysts and phenocrysts, respectively. A major change in crystal size is represented by a change in slope in the CSD curve (Figure 7), where each break in slope reflects a discrete nucleation event (Thivet et al, 2020a). The exact crystal size at which the slope change occurs differs from sample to sample.…”