We present the late Holocene eruption his-tory of the poorly known Dona Juana volcanic complex, in SW Colombia, which last erupted in the twentieth century. This represents a case study for potentially active volcanism in the rural Northern Andes, where tropical climate conditions and a fragmented social memory blur the record of dormant volcanoes. We re-constructed the volcanic stratigraphy of the central-summit vent area by integrating new mapping at 1:5000 scale with radiocarbon ages, sedimentology analysis, and historical chronicles. Our results revealed cyclic transi-tions from lava-dome growth phases and col-lapse to explosive Vulcanian and possibly sub-plinian phases. Pyroclastic density currents were generated by dome collapse producing block-and-ash flows or by pyroclastic foun-tain/column collapse and were rapidly chan-nelized into the deeply incised fluvial valleys around the volcano summit. The pyroclastic density currents were similar to 4-10 x 106 m3 in vol -ume and deposited under granular flow- or fluid escape-dominated depositional regimes at high clast concentrations. In places, more dilute upper portions reached a wider areal distribution that affected the inhabited areas on high depositional terraces. The coefficient of friction (Delta H/L) is higher for block-and-ash flows and dense lava-bearing fountain/low-column-collapse pyroclastic density currents compared to pumice-bearing, column-col-lapse pyroclastic density currents. Associated mass-wasting processes included syneruptive and intereruptive debris flows, with the last one documented in 1936 CE.

Pardo N., Sulpizio R., Lucchi F., Giordano G., Cronin S., Pulgarín B.A., et al. (2023). Late Holocene volcanic stratigraphy and eruption chronology of the dacitic Young Doña Juana volcano, Colombia. GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 135(9-10), 2510-2528 [10.1130/B36557.1].

Late Holocene volcanic stratigraphy and eruption chronology of the dacitic Young Doña Juana volcano, Colombia

Lucchi F.;Roverato M.;
2023

Abstract

We present the late Holocene eruption his-tory of the poorly known Dona Juana volcanic complex, in SW Colombia, which last erupted in the twentieth century. This represents a case study for potentially active volcanism in the rural Northern Andes, where tropical climate conditions and a fragmented social memory blur the record of dormant volcanoes. We re-constructed the volcanic stratigraphy of the central-summit vent area by integrating new mapping at 1:5000 scale with radiocarbon ages, sedimentology analysis, and historical chronicles. Our results revealed cyclic transi-tions from lava-dome growth phases and col-lapse to explosive Vulcanian and possibly sub-plinian phases. Pyroclastic density currents were generated by dome collapse producing block-and-ash flows or by pyroclastic foun-tain/column collapse and were rapidly chan-nelized into the deeply incised fluvial valleys around the volcano summit. The pyroclastic density currents were similar to 4-10 x 106 m3 in vol -ume and deposited under granular flow- or fluid escape-dominated depositional regimes at high clast concentrations. In places, more dilute upper portions reached a wider areal distribution that affected the inhabited areas on high depositional terraces. The coefficient of friction (Delta H/L) is higher for block-and-ash flows and dense lava-bearing fountain/low-column-collapse pyroclastic density currents compared to pumice-bearing, column-col-lapse pyroclastic density currents. Associated mass-wasting processes included syneruptive and intereruptive debris flows, with the last one documented in 1936 CE.
2023
Pardo N., Sulpizio R., Lucchi F., Giordano G., Cronin S., Pulgarín B.A., et al. (2023). Late Holocene volcanic stratigraphy and eruption chronology of the dacitic Young Doña Juana volcano, Colombia. GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 135(9-10), 2510-2528 [10.1130/B36557.1].
Pardo N.; Sulpizio R.; Lucchi F.; Giordano G.; Cronin S.; Pulgarín B.A.; Roverato M.; Correa-Tamayo A.M.; Camacho R.; Cabrera M.A.
File in questo prodotto:
File Dimensione Formato  
pardo et al 2023.pdf

accesso aperto

Tipo: Versione (PDF) editoriale
Licenza: Licenza per Accesso Aperto. Creative Commons Attribuzione (CCBY)
Dimensione 8.66 MB
Formato Adobe PDF
8.66 MB Adobe PDF Visualizza/Apri
21365685.zip

accesso aperto

Tipo: File Supplementare
Licenza: Licenza per Accesso Aperto. Creative Commons Attribuzione (CCBY)
Dimensione 2.6 MB
Formato Zip File
2.6 MB Zip File Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/955277
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 1
  • ???jsp.display-item.citation.isi??? 0
social impact