Facies architecture of an isolated long-lived, nested polygenetic silicic tuff ring erupted in a braided river system

The Los Loros volcano, Mendoza, Argentina

K. Németh, C. Risso, F. Nullo, I. E M Smith, Z. Pécskay

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Los Loros is a small, well-preserved ~ 1. million. year old volcanic depression. The circular ~ 50. m deep and ~ 1. km broad crater is inferred to be a complex small-volume volcano; with multiple eruptive phases produced by magmatic and minor phreatomagmatic explosive eruptions in two distinct eruptive episodes and consequently produced two tuff rings separated by fluvial deposits and/or paleosols. Geochemical data, alongside a new age determination, underlies the fact that the volcano is far older than had been expected from its morphology, and its composition represents a bimodal nature with eruptive products belonging to a typical intraplate basalt to phonolite and a crustal influenced intra-continental rhyolitic lineage. Tuff ring 1 erupted into a braided river system that has already accumulated channelised volcaniclastic conglomerates from distal sources. Tuff ring 2 formed in the same place as Tuff ring 1 and produced welded pyroclastic density current deposits, a capping lava flow and a single intermediate block-and-ash flow deposit which all prevented the edifice from erosion. Los Loros is a small-volume volcano, similar to mafic tuff rings, however, its magma compositions, eruption styles, and inter-eruptive breaks suggest, that it closely resembles a volcanic architecture commonly associated with large, composite volcanoes.

Original languageEnglish
Pages (from-to)33-48
Number of pages16
JournalJournal of Volcanology and Geothermal Research
Volume239-240
DOIs
Publication statusPublished - Sep 15 2012

Fingerprint

Argentina
Volcanoes
braided river
tuff
volcanoes
rivers
river system
volcano
Rivers
Deposits
rings
Ashes
deposits
volcanic eruptions
volcanology
volcanic eruption
phonolite
Chemical analysis
stratovolcano
ash flow

Keywords

  • Braided river
  • Lava dome
  • Maar
  • Phreatomagmatic
  • Silicic
  • Tuff ring
  • Welding

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

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title = "Facies architecture of an isolated long-lived, nested polygenetic silicic tuff ring erupted in a braided river system: The Los Loros volcano, Mendoza, Argentina",
abstract = "Los Loros is a small, well-preserved ~ 1. million. year old volcanic depression. The circular ~ 50. m deep and ~ 1. km broad crater is inferred to be a complex small-volume volcano; with multiple eruptive phases produced by magmatic and minor phreatomagmatic explosive eruptions in two distinct eruptive episodes and consequently produced two tuff rings separated by fluvial deposits and/or paleosols. Geochemical data, alongside a new age determination, underlies the fact that the volcano is far older than had been expected from its morphology, and its composition represents a bimodal nature with eruptive products belonging to a typical intraplate basalt to phonolite and a crustal influenced intra-continental rhyolitic lineage. Tuff ring 1 erupted into a braided river system that has already accumulated channelised volcaniclastic conglomerates from distal sources. Tuff ring 2 formed in the same place as Tuff ring 1 and produced welded pyroclastic density current deposits, a capping lava flow and a single intermediate block-and-ash flow deposit which all prevented the edifice from erosion. Los Loros is a small-volume volcano, similar to mafic tuff rings, however, its magma compositions, eruption styles, and inter-eruptive breaks suggest, that it closely resembles a volcanic architecture commonly associated with large, composite volcanoes.",
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T1 - Facies architecture of an isolated long-lived, nested polygenetic silicic tuff ring erupted in a braided river system

T2 - The Los Loros volcano, Mendoza, Argentina

AU - Németh, K.

AU - Risso, C.

AU - Nullo, F.

AU - Smith, I. E M

AU - Pécskay, Z.

PY - 2012/9/15

Y1 - 2012/9/15

N2 - Los Loros is a small, well-preserved ~ 1. million. year old volcanic depression. The circular ~ 50. m deep and ~ 1. km broad crater is inferred to be a complex small-volume volcano; with multiple eruptive phases produced by magmatic and minor phreatomagmatic explosive eruptions in two distinct eruptive episodes and consequently produced two tuff rings separated by fluvial deposits and/or paleosols. Geochemical data, alongside a new age determination, underlies the fact that the volcano is far older than had been expected from its morphology, and its composition represents a bimodal nature with eruptive products belonging to a typical intraplate basalt to phonolite and a crustal influenced intra-continental rhyolitic lineage. Tuff ring 1 erupted into a braided river system that has already accumulated channelised volcaniclastic conglomerates from distal sources. Tuff ring 2 formed in the same place as Tuff ring 1 and produced welded pyroclastic density current deposits, a capping lava flow and a single intermediate block-and-ash flow deposit which all prevented the edifice from erosion. Los Loros is a small-volume volcano, similar to mafic tuff rings, however, its magma compositions, eruption styles, and inter-eruptive breaks suggest, that it closely resembles a volcanic architecture commonly associated with large, composite volcanoes.

AB - Los Loros is a small, well-preserved ~ 1. million. year old volcanic depression. The circular ~ 50. m deep and ~ 1. km broad crater is inferred to be a complex small-volume volcano; with multiple eruptive phases produced by magmatic and minor phreatomagmatic explosive eruptions in two distinct eruptive episodes and consequently produced two tuff rings separated by fluvial deposits and/or paleosols. Geochemical data, alongside a new age determination, underlies the fact that the volcano is far older than had been expected from its morphology, and its composition represents a bimodal nature with eruptive products belonging to a typical intraplate basalt to phonolite and a crustal influenced intra-continental rhyolitic lineage. Tuff ring 1 erupted into a braided river system that has already accumulated channelised volcaniclastic conglomerates from distal sources. Tuff ring 2 formed in the same place as Tuff ring 1 and produced welded pyroclastic density current deposits, a capping lava flow and a single intermediate block-and-ash flow deposit which all prevented the edifice from erosion. Los Loros is a small-volume volcano, similar to mafic tuff rings, however, its magma compositions, eruption styles, and inter-eruptive breaks suggest, that it closely resembles a volcanic architecture commonly associated with large, composite volcanoes.

KW - Braided river

KW - Lava dome

KW - Maar

KW - Phreatomagmatic

KW - Silicic

KW - Tuff ring

KW - Welding

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