Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/12294
DC Field | Value | Language |
---|---|---|
dc.date.accessioned | 2019-02-25T09:13:23Z | en |
dc.date.available | 2019-02-25T09:13:23Z | en |
dc.date.issued | 2019 | en |
dc.identifier.uri | http://hdl.handle.net/2122/12294 | en |
dc.description.abstract | The Ilopango caldera is located in the central part of El Salvador, within the right-lateral El Salvador Fault System (ESFZ) and adjacent to the capital city of San Salvador. The caldera has a polygonal shape of 17 × 13 km and hosts an intra-caldera lake. Ilopango caldera had multiple collapse eruptions that formed widespread and voluminous silicic ignimbrites. Volcanic activity of the caldera has been controlled by strike-slip faults of the ESFZ. In this work we present the geological characteristics of the first three ignimbrite-forming eruptions of Ilopango caldera, pro- viding an interpretation of the origin and initial stages of the volcanic evolution of this caldera complex. An initial extensional regime of the ESFZ possibly developed a graben at or near the actual Ilopango caldera, where the graben's master faults worked as fissure vents during the first caldera collapse. The Olocuilta Ignimbrite was emplaced at 1.785 ± 0.01 Ma BP, with a Dense Rock Equivalent (DRE) volume N 50 km3 (probably ~300 km3). The ESFZ stress gradually changed from extensive to transtensive, inducing the second collapse associated with a pull-apart caldera, producing the Colima Ignimbrite at 1.56 ± 0.01 Ma BP, with a DRE volume of N11 km3. The transtensive regime increased along the ESFZ, producing the third collapse in the pull-apart graben caldera apparently affected by the newly formed strike-slip San Vicente Fault. This phase corresponds to the ex- plosive eruption that formed the Apopa Ignimbrite at ~1.34 Ma BP, with N9 km3 DRE volume. The latter ignim- brite marks a change in the eruptive style producing hydromagmatic pyroclastic flows followed by a dense ignimbrite with coignimbrite lithic breccias. These features suggest the involvement of water that could come from a paleoIlopango lake within the caldera depression associated with the second caldera collapse at 1.56 Ma BP. Ilopango is thus a multistage caldera system associated with the largest explosive events registered in El Salvador so far. | en |
dc.language.iso | English | en |
dc.relation.ispartof | Journal of Volcanology and Geothermal Research | en |
dc.relation.ispartofseries | /371 (2019) | en |
dc.subject | Central America Volcanic Arc | en |
dc.subject | Tecton Fault | en |
dc.title | The Ilopango caldera complex, El Salvador: Origin and early ignimbrite-forming eruptions of a graben/pull-apart caldera structure | en |
dc.type | article | en |
dc.description.status | Published | en |
dc.description.pagenumber | 1-19 | en |
dc.subject.INGV | 04.08. Volcanology | en |
dc.identifier.doi | 10.1016/j.jvolgeores.2018.12.004 | en |
dc.description.obiettivoSpecifico | 1V. Storia eruttiva | en |
dc.description.journalType | JCR Journal | en |
dc.contributor.author | Sunye Puchol, Ivan | en |
dc.contributor.author | Aguirre-Diaz, Gerardo J. | en |
dc.contributor.author | Dávila Harris, Pablo | en |
dc.contributor.author | Miggins, Daniel P. | en |
dc.contributor.author | Pedrazzi, Dario | en |
dc.contributor.author | Costa, Antonio | en |
dc.contributor.author | Ortega-Obregón, Carlos | en |
dc.contributor.author | Lacan, Pierre | en |
dc.contributor.author | Hernández, Walter | en |
dc.contributor.author | Gutierrez, Eduardo | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Bologna, Bologna, Italia | en |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | restricted | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Bologna, Bologna, Italia | - |
crisitem.author.orcid | 0000-0002-1838-3666 | - |
crisitem.author.orcid | 0000-0003-2165-361X | - |
crisitem.author.orcid | 0000-0002-0620-5459 | - |
crisitem.author.orcid | 0000-0001-8256-8377 | - |
crisitem.author.orcid | 0000-0002-6869-1325 | - |
crisitem.author.orcid | 0000-0002-4987-6471 | - |
crisitem.author.orcid | 0000-0001-9077-8390 | - |
crisitem.author.orcid | 0000-0002-5559-3419 | - |
crisitem.author.orcid | 0000-0002-1216-7276 | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
Appears in Collections: | Article published / in press |
Files in This Item:
File | Description | Size | Format | Existing users please Login |
---|---|---|---|---|
sunagu2019.pdf | 1.4 MB | Adobe PDF |
WEB OF SCIENCETM
Citations
7
checked on Feb 10, 2021
Page view(s)
84
checked on Apr 27, 2024
Download(s)
4
checked on Apr 27, 2024