@article{fdi:010079287,
  title = {{H}ow shear helps lava to flow  [plus {S}upplementary data].},
  author = {{H}arris, {A}. and {M}annini, {S}. and {T}hivet, {S}. and {C}hevrel, {M}agdalena {O}ryaelle and {G}urioli, {L}. and {V}illeneuve, {N}. and {D}i {M}uro, {A}. and {P}eltier, {A}.},
  editor = {},
  language = {{ENG}},
  abstract = {{U}nderstanding the thermo-rheological regime and physical character of lava while it is flowing is crucial if we are to adequately model lava flow emplacement dynamics. {W}e present measurements from simultaneous sampling and thermal imaging across the full width of an active channel at {P}iton de la {F}ournaise ({L}a {R}{\'e}union, {F}rance). {O}ur data set involves measurements of flow dynamics at three sites down-channel from the vent. {Q}uantification of flow velocities, cooling rates, sample texture, and rheology allows all thermo-rheological parameters to be linked, and down- as well as cross-channel variations to be examined. {W}ithin 150 m from the vent, we recorded an unexpected velocity increase (from 0.07 to 0.1 m/s), in spite of cooling rates of 0.19-0.29 °{C}/m and constant slope. {T}his change requires a switch from a {N}ewtonian-dominated regime to a {B}ingham plug-dominated regime. {S}ample analysis revealed that the plug consists of foam-like lava, and the shear zones involve vesicle-poor (low-viscosity) lava. {W}ith distance from the vent, shear zones develop, carrying the vesicular plug between them. {T}his causes flow to initially accelerate, helped by bubble shearing in narrow lateral shear zones, until cooling takes over as the main driver for viscosity increase and, hence, velocity decrease.},
  keywords = {{REUNION} ; {PITON} {DE} {LA} {FOURNAISE} {VOLCAN}},
  booktitle = {},
  journal = {{G}eology},
  volume = {48},
  numero = {2},
  pages = {154--158 [+ 14 ]},
  ISSN = {0091-7613},
  year = {2020},
  DOI = {10.1130/{G}47110.1},
  URL = {https://www.documentation.ird.fr/hor/fdi:010079287},
}