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The 322 ka Tiribí Tuff: stratigraphy, geochronology and mechanisms of deposition of the largest and most recent ignimbrite in the Valle Central, Costa Rica

Abstract

The Tiribí Tuff covered much of the Valle Central of Costa Rica, currently the most densely populated area in the country (∼2.4 million inhabitants). Underlying the tuff, there is a related well-sorted pumice deposit, the Tibás Pumice Layer. Based on macroscopic characteristics of the rocks, we distinguish two main facies in the Tiribí Tuff in correlation to the differences in welding, devitrification, grain size, and abundance of pumice and lithic fragments. The Valle Central facies consists of an ignimbritic plateau of non-welded to welded deposits within the Valle Central basin and the Orotina facies is a gray to light-bluish gray, densely to partially welded rock, with yellowish and black pumice fragments cropping out mainly at the Grande de Tárcoles River Gorge and Orotina plain. This high-aspect ratio ignimbrite (1:920 or 1.1×10−3) covered an area of at least 820 km2 with a long runout of 80 km and a minimum volume outflow of 25 km3 (15 km3 DRE). Geochemically, the tuff shows a wide range of compositions from basaltic-andesites to rhyolites, but trachyandesites are predominant. Replicate new 40Ar/39Ar age determinations indicate that widespread exposures of this tuff represent a single ignimbrite that was erupted 322±2 ka. The inferred source is the Barva Caldera, as interpreted from isopach and isopleth maps, contours of the ignimbrite top and geochemical correlation (∼10 km in diameter). The Tiribí Tuff caldera-forming eruption is interpreted as having evolved from a plinian eruption, during which the widespread basal pumice fall was deposited, followed by fountaining pyroclastic flows. In the SW part of the Valle Central, the ignimbrite flowed into a narrow canyon, which might have acted as a pseudo-barrier, reflecting the flow back towards the source and thus thickening the deposits that were filling the Valle Central depression. The variable welding patterns are interpreted to be a result of the lithostatic load and the influence of the content and size of lithic fragments.

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Acknowledgements

We thank the Escuela Centroamericana de Geología of the Universidad de Costa Rica for the support of this investigation, which was used as W. Pérez's thesis, and we especially thank Prof. Siegfried Kussmaul. Gans acknowledges financial support for his travel, sample collection, geochronology and the geochronologic work performed for his study as coming from the National Science Foundation (Grants EAR 9975339 and EAR 9806453), the NSF MARGINS program, and a UCSB academic senate grant. Also we are very grateful to Rachel Hannah for joining us on field trips and especially to Lina Patiño and Thomas Vogel from Michigan State University who provided us with the chemical analyses, thin sections, review of the manuscript and invaluable help and support. We thank Andy Calvert for help with some of the 40Ar/39Ar analyses as well. Thomas Vogel, David Szymanski and Seth Sadofsky made several helpful comments on the manuscript. Armin Freundt, an anonymous reviewer and Martin Streck made opportune corrections and suggestions that significantly improved the manuscript.

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Correspondence to Wendy Pérez.

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Editorial responsibility: C. Kilburn

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Pérez, W., Alvarado, G.E. & Gans, P.B. The 322 ka Tiribí Tuff: stratigraphy, geochronology and mechanisms of deposition of the largest and most recent ignimbrite in the Valle Central, Costa Rica. Bull Volcanol 69, 25–40 (2006). https://doi.org/10.1007/s00445-006-0053-x

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Keywords

  • Tiribí Tuff
  • Ignimbrite
  • Welding facies
  • Channelized
  • 40Ar/39Ar geochronology
  • Barva caldera
  • Costa Rica