Fabrics, facies, and flow through a large-volume ignimbrite: Pampa De Oxaya, Chile

Ellen Platzman*, R S J Sparks, Frances J Cooper

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

1 Citation (Scopus)

Abstract

The Central Andes of northern Chile and southern Peru exposes the Oxaya Formation, a sequence of four ignimbrites that constitute one of the largest Miocene ignimbrite provinces on Earth (Salas et al. 1966; Wörner et al. 2000; García et al. 2004; van Zalinge et al. 2016). Oxaca Formation ignimbrites form a prominent plateau along the western escarpment of the Western Cordillera (Fig. 1). Ignimbrites of this magnitude (M > 8 using the magnitude scale of Mason et al. 2004) are a result of large catastrophic explosive eruptions and caldera collapse. They commonly travel to distances exceeding 100 km from their source and represent some of the most dangerous and destructive eruptions on the planet. However, because there have been no eruptions of this magnitude in recorded history, fundamental depositional processes within the associated large pyroclastic eruptions remain poorly constrained. Examination of magnetic petrofabrics using the anisotropy of magnetic susceptibility (AMS) can yield important insights into the transport and deposition of these enormous flows as well as post-depositional processes.
Original languageEnglish
Article number8
Number of pages19
JournalBulletin of Volcanology
Volume82
Issue number1
Early online date23 Dec 2019
DOIs
Publication statusPublished - 1 Jan 2020

Keywords

  • Ignimbrite
  • Magnetic anisotropy
  • Mineral fabric
  • Granular flow

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