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Bulletin of Volcanology

, Volume 72, Issue 3, pp 309–330 | Cite as

Paleomagnetic determination of emplacement temperatures of pyroclastic deposits: an under-utilized tool

  • Greig A. PatersonEmail author
  • Andrew P. Roberts
  • Conall Mac Niocaill
  • Adrian R. Muxworthy
  • Lucia Gurioli
  • José G. Viramonté
  • Carlos Navarro
  • Shoshana Weider
Research Article

Abstract

Paleomagnetic data from lithic clasts collected from Mt. St. Helens, USA, Volcán Láscar, Chile, Volcán de Colima, Mexico and Vesuvius, Italy have been used to determine the emplacement temperature of pyroclastic deposits at these localities and to highlight the usefulness of the paleomagnetic method for determining emplacement temperatures. At Mt. St. Helens, the temperature of the deposits (T dep ) at three sites from the June 12, 1980 eruption was found to be ≥532°C, ≥509°C, and 510–570°C, respectively. One site emplaced on July 22, 1980 was emplaced at ≥577°C. These new paleomagnetic temperatures are in good agreement with previously published direct temperature measurements and paleomagnetic estimates. Lithic clasts from pyroclastic deposits from the 1993 eruption of Láscar were fully remagnetized above the respective Curie temperatures, which yielded a minimum T dep of 397°C. Samples were also collected from deposits thought to be pyroclastics from the 1913, 2004 and 2005 eruptions of Colima. At Colima, the sampled clasts were emplaced cold. This is consistent with the sampled clasts being from lahar deposits, which are common in the area, and illustrates the usefulness of the paleomagnetic method for distinguishing different types of deposit. T dep of the lower section of the lithic rich pyroclastic flow (LRPF) from the 472 A.D. deposits of Vesuvius was ~280–340°C. This is in agreement with other, recently published paleomagnetic measurements. In contrast, the upper section of the LRPF was emplaced at higher temperatures, with T dep ~520°C. This temperature difference is inferred to be the result of different sources of lithic clasts between the upper and lower sections, with the upper section containing a greater proportion of vent-derived material that was initially hot. Our studies of four historical pyroclastic deposits demonstrates the usefulness of paleomagnetism for emplacement temperature estimation.

Keywords

Emplacement temperature Mt. St. Helens Paleomagnetism Pyroclastic deposits Vesuvius Volcán de Colima Volcán Láscar 

Notes

Acknowledgements

This study was funded by NERC grant NER/S/A/2005/13478. Collection of the Mt. St. Helens, Colima and Vesuvius samples was funded through a Royal Society grant to ARM. We thank Karen Paola Guzmán Montenegro for assistance with collecting samples from Láscar, Jose Guadalupe Landin Orozco for assisting with sampling at Colima and Francesca Lawley and Andrew Harris for assistance at Vesuvius. We thank Michelle Harris for assistance with lithology classification. We also thank two anonymous reviewers for their helpful comments that improved the manuscript.

Supplementary material

445_2009_324_MOESM1_ESM.pdf (95 kb)
Supplementary material: Paleomagnetic determination of emplacement temperatures of pyroclastic deposits: an under-utilized tool (PDF 95 KB)

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Greig A. Paterson
    • 1
    Email author
  • Andrew P. Roberts
    • 1
  • Conall Mac Niocaill
    • 2
  • Adrian R. Muxworthy
    • 3
  • Lucia Gurioli
    • 4
  • José G. Viramonté
    • 5
  • Carlos Navarro
    • 6
  • Shoshana Weider
    • 2
  1. 1.National Oceanography CentreUniversity of SouthamptonSouthamptonUK
  2. 2.Department of Earth SciencesUniversity of OxfordOxfordUK
  3. 3.Department of Earth Science and EngineeringImperial CollegeLondonUK
  4. 4.Department of Geology and Geophysics, SOESTUniversity of HawaiiHonoluluUSA
  5. 5.Instituto GeonorteUniversidad Nacional de SaltaSaltaRepública Argentina
  6. 6.Observertorio VulcanólogicoUniversidad de ColimaColimaMexico

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