Decoding links between magmatic processes and eruption dynamics: Whole-rock time series petrology of the 2021 Tajogaite eruption, La Palma

• Jane H. Scarrow ^[1] ; Matthew J. Pankhurst ^[7] ; Olivia A. Barbee ^[8] ; Katy J. Chamberlain ^[2] ; Daniel J. Morgan ^[2] ; Mark-Antoine Longpré ^[3] ; Samantha Tramontano ^[9] ; James Hickey ^[4] ; David A. Neave ^[5] ; Gavyn K. Rollinson ^[4] ; Alexander G. Stewart ^[5] ; Penny E. Wieser ^[6] ; Beverly C. Coldwell ^[10] ; William Hernández ^[10] ; Luca D'Auria ^[10] ; Nemesio M. Pérez ^[10]
  1. [1] Universidad de Granada

     Universidad de Granada

     Granada, España

     
  2. [2] University of Liverpool

     University of Liverpool

     Reino Unido

     
  3. [3] City University of New York

     City University of New York

     Estados Unidos

     
  4. [4] University of Exeter

     University of Exeter

     Exeter District, Reino Unido

     
  5. [5] University of Manchester

     University of Manchester

     Reino Unido

     
  6. [6] University of California System

     University of California System

     Estados Unidos

     
  7. [7] Instituto Volcanológico de Canarias (INVOLCAN)
  8. [8] Xnovo Technology, Køge, Denmark
  9. [9] American Museum of Natural History
  10. [10] Instituto Volcanológico de Canarias

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• Localización: Cosmológica, ISSN 2792-7423, Nº. Extra 1 (Conferencia Internacional: Erupción del Tajogaite (Los Llanos de Aridane, noviembre de 2025)), 2025, págs. 181-182
• Idioma: inglés
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• Resumen

  • We present an integrated petrological study of the 2021 Tajogaite eruption, examining magmatic processes that initiated, sustained, and terminated surface volcanic activity. High temporal resolution sampling of near-continuously erupted alkali-basalt lava and tephra over the 85-day event reveals magma plumbing system dynamics from compositional trends. Initial deposits were mineralogically varied, reflecting mobilisation of shallow, evolved mush perturbed by fresh deep, primitive magma influx (Stage 1 - initiation). Transition to more primitive, uniform compositions recorded progressively deeper tapping of pre-existing magmatic zonation (Stage 2 - evacuation). The final stage (Stage 3 - waning) was characterised by more evolved magma compositions, with tephra glass compositions suggesting a proportionately larger role of mush interstitial melts. We suggest this reflects shutdown of mantle-derived magma supply, a key process in eruption termination, and compressiondriven melt extraction of less mobile melts. Correlation with geophysical monitoring data demonstrates how near-real-time petrological monitoring can improve understanding of when an eruption may end.