Bromo activity over the last decade: consistent passive degassing and source magma evolution - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Geoscience Letters Année : 2022

Bromo activity over the last decade: consistent passive degassing and source magma evolution

Hilma Alfianti
  • Fonction : Auteur
Mamay Sumaryadi
  • Fonction : Auteur
Sofyan Primulyana
  • Fonction : Auteur
Mita Marlia
  • Fonction : Auteur
Ugan B. Saing
  • Fonction : Auteur
Nia Haerani
  • Fonction : Auteur
Hendra Gunawan
  • Fonction : Auteur

Résumé

Bromo is among the very active volcanoes in Indonesia and is known for its recurrent and long-lasting eruptive manifestations. Past volcanic gas studies have revealed Bromo as one of the principal sources of volcanic degassing in Indonesia. This high degassing from Bromo volcano is further characterized in this work, based on more than 10 years of intermittent ground-based gas measurements, combined with daily SO2 mass, captured by the OMI sensor. Over the past decade, Bromo has released 0.7 Tg of SO2 into the atmosphere, representing 3% of the volcanic degassing budget of Indonesia and 0.3% of the global volcanic SO2 emission budget outside eruptive periods. Results also reveal that 18.8 Tg of H2O, 2.0 Tg of CO2, 0.1 Tg of H2S, and 0.005 Tg of H2 were released from the Bromo volcano in one decade. About 81% of these gases are released passively between eruptive events. The chemistry of the eruptive products, sampled between 2001 and 2019, indicate that Bromo volcanic activity is sustained by a basaltic-andesite to basalt trachy-andesite magma source with a transition from medium-K to high-K composition. Such an evolution associated to a C-rich gas likely resulted from a low partial melting and sediment contribution to the genesis of the source magma. New magma injections into the reservoir and fractional crystallization have further amplified the changes of magma composition. Finally, we speculate that the shallow reservoir replenishment, in response to the continuous strong degassing is the driving mechanism behind the Bromo frequent eruptive events.
Fichier principal
Vignette du fichier
s40562-022-00221-2.pdf (1.9 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

insu-03708890 , version 1 (29-06-2022)

Licence

Paternité

Identifiants

Citer

Hilma Alfianti, Philipson Bani, Mamay Sumaryadi, Sofyan Primulyana, Mita Marlia, et al.. Bromo activity over the last decade: consistent passive degassing and source magma evolution. Geoscience Letters, 2022, 9, ⟨10.1186/s40562-022-00221-2⟩. ⟨insu-03708890⟩
26 Consultations
19 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More