Abstract
The central Snake River Plain (CSRP) of southern Idaho and northern Nevada, USA, forms part of the Columbia River–Yellowstone large igneous province. Volcanic rocks of the province are compositionally bimodal (basalt–rhyolite), and the rhyolites produce a broadly time-transgressive record of a hotspot which is currently located under Yellowstone. Snake River Plain rhyolites represent hot (>850 °C), dry magmas and have field characteristics consistent with high emplacement temperatures. Individual ignimbrite sheets reach 1,000 km3 and exhibit little to no compositional zonation on a large scale but reveal considerable complexity on a crystal scale, particularly with regard to pyroxene compositions. Multiple pyroxene compositions may exist in a single ignimbrite which, along with multiple glass compositions in widely dispersed fallout tephra, suggests complex storage of rhyolite prior to eruption. Unlike most igneous rocks, the mineral cargo of the CSRP rhyolites exhibits little isotopic variability, with unimodal 87Sr/86Sr values returned from plagioclase grains inferred to represent the combination of strong crystal–melt coupling and rapid diffusional re-equilibriation. All the rhyolites within the CSRP have a characteristic low-δ 18O signature; with >20,000 km3 of rhyolite exhibiting this depletion, the CSRP represents the largest low-δ 18O province on Earth. The low-18O nature of the rhyolites requires assimilation of hydrothermally altered materials which may be from altered Eocene batholithic rocks or from down-dropped intra-caldera tuffs. The wide range of crustal assimilants, with highly variable radiogenic isotope characteristics, available in the CSRP is permissive of a variety of petrogenetic models based on radiogenic isotopic data.
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Acknowledgments
Snake River Plain research at Washington State University has been generously funded by NSF (EAR0610081 and EAR0911457), and in the UK funding from NERC (NER/S/A/2004/12340) is gratefully acknowledged. Our work in the SRP has benefitted greatly from a discussion with numerous collaborators including Bill Leeman, Mike Branney, Graham Andrews, Ilya Bindeman, Mike McCurry, Barbara Nash, Henny Cathey, John Kauffman, Eric Christiansen, Matt Brueseke, and Marty Godchaux, although they may not agree with all (or indeed any) of our conclusions. We would like to thank the Bulletin of Volcanology for the invitation to submit this paper and the editorial assistance (and patience) from Steve Self. Graham Andrews and Henny Cathey were kind enough to provide informal reviews, and Matt Brueseke and Barbara Nash are thanked for their careful journal reviews.
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Ellis, B.S., Wolff, J.A., Boroughs, S. et al. Rhyolitic volcanism of the central Snake River Plain: a review. Bull Volcanol 75, 745 (2013). https://doi.org/10.1007/s00445-013-0745-y
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DOI: https://doi.org/10.1007/s00445-013-0745-y