Loading...
Please wait, while we are loading the content...
Similar Documents
Eruptive parameters and dynamics of the April 2015 sub-Plinian eruptions of Calbuco volcano (southern Chile)
| Content Provider | Semantic Scholar |
|---|---|
| Author | Castruccio, Angelo Clavero, Jorge Segura, Andrea Samaniego, Pablo Roche, Olivier Pennec, Jean-Luc Le Droguett, Bárbara Rodríguez |
| Copyright Year | 2016 |
| Abstract | We conducted geological and petrological analyses of the tephra fallout and pyroclastic density current (PDC) products of the 22-23 April 2015 Calbuco eruptions. The eruptive cycle consisted of two sub-Plinian phases that generated > 15 km height columns and PDCs that travelled up to 6 km from the vent. The erupted volume is estimated at 0.38 km3 (non-DRE), with approximately 90% corresponding to tephra fall deposits and the other 10% to PDC deposits. The erupted products are basaltic-andesite, 54-55 wt.% SiO2, with minor amounts of andesite (58 wt.% SiO2). Despite the uniform composition of the products, there are at least four types of textures in juvenile clasts, with different degrees of vesicularity and types and content of crystals. We propose that the eruption triggering mechanism was either exsolution of volatiles due to crystallization, or a small intrusion into the base of the magma chamber, without significant magma mixing or with a magma compositionally similar to that of the residing magma. In either case the triggering mechanism generated convection and sufficient overpressure to promote the first eruptive phase. The start of the eruption decompressed the chamber, promoting intense vesiculation of the remaining magma and an increase in eruption rate towards the end of the eruption. |
| Starting Page | 1 |
| Ending Page | 19 |
| Page Count | 19 |
| File Format | PDF HTM / HTML |
| DOI | 10.1007/s00445-016-1058-8 |
| Volume Number | 78 |
| Alternate Webpage(s) | http://repositorio.uchile.cl/bitstream/handle/2250/142920/Eruptive-parameters-and-dynamics-of-the-April-2015.pdf?isAllowed=y&sequence=1 |
| Alternate Webpage(s) | https://doi.org/10.1007/s00445-016-1058-8 |
| Journal | Bulletin of Volcanology |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
