首页|Characteristics and emplacement mechanisms of the Coranzuli ignimbrites (Central Andes)
Characteristics and emplacement mechanisms of the Coranzuli ignimbrites (Central Andes)
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NETL
NSTL
Elsevier
We present a detailed stratigraphy of the Coranzuli caldera-forming deposits. This caldera, located in the Altiplano-Puna Volcanic Complex (Central Andes), generated four ignimbrite deposits with similar field characteristics and fades that differ from each other in, above all, the nature of the lithic fragments they contain. Three different lithofacies (fine-grained cross-stratified facies, massive lithic breccia fades and massive ignimbrite fades) are found in all the ignimbrite deposits, which occasionally also contain a lenticular lithic-rich fades and/or a pumice-rich fades. These field characteristics and, in particular, local deposit thicknesses were used to develop a theoretical model of the dynamics and emplacement mode of the Coranzuli pyroclastic flows. Our results show that these ignimbrites were emplaced by dense pyroclastic density currents subjected to high accumulation rates and velocities, thereby indicating rapid en masse emplacement that was also influenced by local paleotopography as deduced from fades analysis. (C) 2020 Elsevier B.V. All rights reserved.
CoranzuliCentral AndesPunaCrystal-rich ignimbritesPyroclastic density currentAltiplano-Puna Volcanic complex
NETL
NSTL
Elsevier
