Temporal dissection of the Huckleberry Ridge Tuff using the 40Ar/39Ar dating technique

Ellis, B.S., Mark, D.F. , Pritchard, C.J. and Wolff, J.A. (2012) Temporal dissection of the Huckleberry Ridge Tuff using the 40Ar/39Ar dating technique. Quaternary Geochronology, 9, pp. 34-41. (doi: 10.1016/j.quageo.2012.01.006)

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New high-precision single crystal sanidine 40Ar/39Ar ages for the Huckleberry Ridge Tuff (HRT), Yellowstone volcanic field, show that the three HRT members (A, B, and C) represent at least two different eruptions. The new 40Ar/39Ar ages (all ages calculated relative to the optimisation model of Renne et al., 2011) are: 2.135 ± 0.006 Ma, 2.131 ± 0.008 Ma, and 2.113 ± 0.004 Ma (2σ, full uncertainty propagation), for members A, B and C, respectively. Members A and B are within uncertainty of one another and both are more precise than, but in agreement with, previously published ages. Member C was erupted later than members A and B. HRT members A and B were deposited during the Reunion Normal Polarity Subchron (C2r.1n). Member C was deposited during Subchron C2r.1r. Previously published radiogenic and stable isotope data show that member C was sourced from an isotopically discrete magma with a higher fraction of crustal material than members A and B. The volume of the first HRT eruption is reduced by c. 12% from previous estimates and explosive eruptions from the Yellowstone volcanic field occurred more frequently, producing more homogeneous magma than was previously believed. High-precision 40Ar/39Ar dating is key for resolving the eruptive history of Yellowstone, temporal dissection of voluminous ignimbrites, and rigorous investigation of what constitutes a ‘super-eruption’.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Mark, Professor Darren
Authors: Ellis, B.S., Mark, D.F., Pritchard, C.J., and Wolff, J.A.
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Quaternary Geochronology

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