A high-precision age estimate of the Holocene Plinian eruption of Mount Mazama, Oregon, USA

Egan, Joanne, Staff, Richard and Blackford, Jeff. J. (2015) A high-precision age estimate of the Holocene Plinian eruption of Mount Mazama, Oregon, USA. The Holocene, 25 (7). pp. 1054-1067. ISSN 1477-0911 DOI https://doi.org/10.1177/0959683615576230

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Abstract

The climactic eruption of Mount Mazama in Oregon, North America, resulted in the deposition of the most widespread Holocene tephra deposit in the conterminous United States and south-western Canada. The tephra forms an isochronous marker horizon for palaeoenvironmental, sedimentary and archaeological reconstructions, despite the current lack of a precise age estimate for the source eruption. Previous radiocarbon age estimates for the eruption have varied, and Greenland ice-core ages are in disagreement. For the Mazama tephra to be fully utilised in tephrochronology and palaeoenvironmental research, a refined (precise and accurate) age for the eruption is required. Here, we apply a meta-analysis of all previously published radiocarbon age estimations (n = 81), and perform Bayesian statistical modelling to this data set, to provide a refined age of 7682–7584 cal. yr BP (95.4% probability range). Although the depositional histories of the published ages vary, this estimate is consistent with that estimated from the GISP2 ice-core of 7627 ± 150 yr BP (Zdanowicz et al., 1999).

Item Type: Article
Uncontrolled Keywords: Mazama tephra, Holocene, radiocarbon dating, tephrochronology, Bayesian statistics, geochronology.
Subjects: G Geography. Anthropology. Recreation > G Geography (General)
G Geography. Anthropology. Recreation > GA Mathematical geography. Cartography
G Geography. Anthropology. Recreation > GB Physical geography
Q Science > QA Mathematics
Divisions: Geography, Earth and Environmental Sciences
Date Deposited: 23 Feb 2016 15:52
URI: http://repository.edgehill.ac.uk/id/eprint/7096

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