Temporal dissection of the Huckleberry Ridge Tuff using the 40Ar/39Ar dating technique |
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| Institution: | 1. School of Geography, Environment and Earth Sciences, Victoria University, PO Box 600, Wellington 6140, New Zealand;2. Department of Earth Sciences, Durham University, Science Labs, Durham DH1 3LE, UK;1. University of Bristol, UK;2. Universitá Roma Tre, Italy;1. Department of Earth and Environmental Science, New Mexico Institute of Mining and Technology, Socorro, NM 87801, USA;2. Comprehensive Volcanic Petrographics LLC, 2622 H Road, Grand Junction, CO 81506, USA;3. 5515 Quemazon, Los Alamos, NM 87544, USA;4. Bureau of Geology and Mineral Resources, New Mexico Institute of Mining and Technology, Socorro, NM 87801, USA |
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| Abstract: | 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’. |
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