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dc.contributor.authorMartí Molist, Joanes_ES
dc.contributor.authorPlanagumà, L.es_ES
dc.contributor.authorGeyer, Adelinaes_ES
dc.contributor.authorAguirre-Díaz, Gerardoes_ES
dc.contributor.authorPedrazzi, Darioes_ES
dc.contributor.authorBolós, Xavieres_ES
dc.identifier.citationBulletin of Volcanology, 79(5): Article number 33 (2017)es_ES
dc.description.abstractIgnimbrites are pyroclastic density current deposits common in explosive volcanism involving intermediate and silicic magmas and in less abundance in eruptions of basaltic central and shield volcanoes. However, they are not widely described in association with monogenetic volcanism, where typical products include lava flows, scoria and lapilli fall deposits, as well as various kinds of pyroclastic density current deposits and explosion breccias. In La Garrotxa basaltic monogenetic volcanic field, part of the Neogene-Quaternary European rift system located in the northeast of the Iberian Peninsula, we have identified a particular group of pyroclastic density current deposits that show similar textural characteristics to silicic ignimbrites, indicating an overlap in transport and depositional processes. These deposits can be clearly distinguished from other pyroclastic density current deposits generated during phreatomagmatic phases that typically correspond to thinly laminated units with planar-to-cross-bedded stratification. The monogenetic ignimbrite deposits correspond to a few meters to several tens of meters thick units rich in lithic- and lapilli scoria fragments, with an abundant ash matrix, and internally massive structure, emplaced along valleys and gullies, with run-out distances up to 6 km and individual volumes ranging from 106 to 1.5 × 107 m3. The presence of flattened scoria and columnar jointing in some of these deposits suggests relatively high emplacement temperatures, coinciding with available paleomagnetic data that suggests an emplacement temperature around 450–500 °C. In this work, we describe the main characteristics of these pyroclastic deposits that were generated by a number of phreatomagmatic episodes. Comparison with similar deposits from silicic eruptions and previous examples of ignimbrites associated with basaltic volcanism allows us to classify them as ‘basaltic ignimbrites’. The recognition in monogenetic volcanism of such pyroclastic products, which may extend several kilometres from source, has an important consequence for hazard assessment in these volcanic fields, which previously have been considered to present only minor hazards and risks. © 2017, Springer-Verlag Berlin Heidelberg.es_ES
dc.description.sponsorshipJM is grateful for the MECD (PRX16/00056) grant. AG is grateful for her Ramón y Cajal contract (RYC-2012-11024).es_ES
dc.subjectBasaltic ignimbriteses_ES
dc.subjectLa Garrotxa volcanic fieldes_ES
dc.subjectMonogenetic volcanismes_ES
dc.subjectVolcanic hazardses_ES
dc.titleBasaltic ignimbrites in monogenetic volcanism: the example of La Garrotxa volcanic fieldes_ES
dc.description.peerreviewedPeer reviewedes_ES
oprm.item.hasRevisionno ko 0 false*
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