Title :

Metastable liquid immiscibility in the 2018–2021 Fani Maoré lavas as a mechanism for volcanic nanolite formation

Author(s) :

Thivet, Simon [Auteur]
Ludwig Maximilian University [Munich] = Ludwig Maximilians Universität München [LMU]
Pereira, Luiz [Auteur]
Ludwig Maximilian University [Munich] = Ludwig Maximilians Universität München [LMU]
Menguy, Nicolas [Auteur]
Muséum national d'Histoire naturelle [MNHN]
Médard, Etienne [Auteur]
Laboratoire Magmas et Volcans [LMV]
Verdurme, Pauline [Auteur]
Laboratoire Magmas et Volcans [LMV]
Berthod, Carole [Auteur]
Institut de Physique du Globe de Paris [IPG Paris]
Troadec, David [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Centrale de Micro Nano Fabrication - IEMN [CMNF - IEMN]
Hess, Kai-Uwe [Auteur]
Ludwig Maximilian University [Munich] = Ludwig Maximilians Universität München [LMU]
Dingwell, Donald [Auteur]
Ludwig Maximilian University [Munich] = Ludwig Maximilians Universität München [LMU]
Komorowski, Jean-Christophe [Auteur]
Institut de Physique du Globe de Paris [IPG Paris]

Journal title :

Communications Earth & Environment

Pages :

483

Publisher :

Springer Nature

Publication date :

2023-12-16

ISSN :

2662-4435

English keyword(s) :

Mineralogy
Natural hazards
Petrology
Volcanology

HAL domain(s) :

Planète et Univers [physics]

English abstract : [en]

Nanoscale liquid immiscibility is observed in the 2018-2021 Fani Maoré submarine lavas (Comoros archipelago). Heat transfer calculations, Raman spectroscopy, scanning and transmission electron microscopy reveal that in ...
Show more >Nanoscale liquid immiscibility is observed in the 2018-2021 Fani Maoré submarine lavas (Comoros archipelago). Heat transfer calculations, Raman spectroscopy, scanning and transmission electron microscopy reveal that in contrast to thin (500 µm) outer rims of homogeneous glassy lava (rapidly quenched upon eruption, >1000 °C s-1), widespread liquid immiscibility is observed in thick (1 cm) inner lava rims (moderately quenched, 1-1000 °C s-1), which exhibit a nanoscale coexistence of Si-and Al-rich vs. CaFe Fe-, and Ti-rich melt phases. In this zone, rapid nanolite crystallization contrasts with the classical crystallization process inferred for the slower cooled (< 1 °C s-1) lava interiors. The occurrence of such metastable liquid immiscibility at eruptive conditions controls physicochemical characteristics of nanolites and residual melt compositions. This mechanism represents a common yet frequently unobserved feature in volcanic products, with the potential for major impacts on syn-eruptive magma degassing and rheology, and thus on eruptive dynamics.Show less >

Language :

Anglais

Popular science :

Non

ANR Project :

Université de Paris

Collections :

• Institut d'Électronique, de Microélectronique et de Nanotechnologie (IEMN) - UMR 8520

Source :

Harvested from HAL