Rhyolitic ignimbrites in the Rogerson Graben, southern Snake River Plain volcanic province: volcanic stratigraphy, eruption history and basin evolution

Andrews, Graham; Branney, Michael J.; Bonnichsen, Bill; McCurry, Michael

doi:10.1007/s00445-007-0139-0

Cited by 50 publications

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“…The succession around Rogerson, Idaho, has been resolved and is now divided into 11 clearly defined eruption-units. The work builds upon recent studies further east, in the Cassia Hills (Knott et al 2016), at Rogerson Graben (Andrews and Branney 2005;Andrews et al 2008), and to the west, at Brown's Bench escarpment ; Fig. 1).…”

Section: Introduction and Geological Settingmentioning

confidence: 70%

“…1) and belong to the Idavada Volcanic Group (Malde and Powers 1962;Andrews et al 2008). The formation exceeds 420 m thickness (base not seen; Fig.…”

Section: The Rogerson Formationmentioning

confidence: 98%

“…2) and comprises rhyolitic ignimbrites and thinner ashfall layers thought to be derived from eruptive sources concealed beneath basalts in the central Snake River Plain ). Prior to this study, it was subdivided into five members (Andrews and Branney 2005;Andrews et al 2008), with another 12 informal units ('BBU 1-12' of Bonnichsen et al 2008) reported on the adjacent Brown's Bench scarp (Fig. 1) of which two were correlated with units in the graben ).…”

Section: The Rogerson Formationmentioning

confidence: 99%

“…The Rabbit Springs Member was once thought to be distinct from a local unit referred to as 'Jackpot 7' of Andrews et al (2008). However, the two units are never seen together in stratigraphic continuity.…”

Section: Rabbit Springs Membermentioning

confidence: 99%

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Rheomorphic ignimbrites of the Rogerson Formation, central Snake River plain, USA: record of mid-Miocene rhyolitic explosive eruptions and associated crustal subsidence along the Yellowstone hotspot track

et al. 2016

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Rogerson Graben, USA, is critically placed at the intersection between the Yellowstone hotspot track and the southern projection of the west Snake River rift. Eleven rhyolitic members of the re-defined, ≥420-m-thick, Rogerson Formation record voluminous high-temperature explosive eruptions, emplacing extensive ashfall and rheomorphic ignimbrite sheets. Yet, each member has subtly distinct field, chemical and palaeomagnetic characteristics. New regional correlations reveal that the Brown's View ignimbrite covers ≥3300 km 2 , and the Wooden Shoe ignimbrite covers ≥4400 km 2 and extends into Nevada. Between 11.9 and ∼8 Ma, the average frequency of large explosive eruptions in this region was 1 per 354 ky, about twice that at Yellowstone. The chemistry and mineralogy of the early rhyolites show increasing maturity with time possibly by progressive fractional crystallisation. This was followed by a trend towards less-evolved rhyolites that may record melting and h y b r i d i s a t i o n o f a m i d -c r u s t a l s o u r c e r e g i o n . Contemporaneous magmatism-induced crustal subsidence of the central Snake River Basin is recorded by successive ignimbrites offlapping and thinning up the N-facing limb of a regional basin-margin monocline, which developed between 10.59 and 8 Ma. The syn-volcanic basin topography contrasted significantly with the present-day elevated Yellowstone hotspot plateau. Concurrent basin-and-range extension produced the N-trending Rogerson Graben: early uplift of the Shoshone Hills (≥10.34 Ma) was followed by initiation of the Shoshone Fault and an E-sloping half-graben (∼10.3-10.1 Ma). The graben asymmetry then reversed with initiation of the Brown's Bench Fault (≥8 Ma), which remained intermittently active until the Pliocene.

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Section: Introduction and Geological Settingmentioning

confidence: 70%

“…1) and belong to the Idavada Volcanic Group (Malde and Powers 1962;Andrews et al 2008). The formation exceeds 420 m thickness (base not seen; Fig.…”

Section: The Rogerson Formationmentioning

confidence: 98%

Section: The Rogerson Formationmentioning

confidence: 99%

Section: Rabbit Springs Membermentioning

confidence: 99%

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Rheomorphic ignimbrites of the Rogerson Formation, central Snake River plain, USA: record of mid-Miocene rhyolitic explosive eruptions and associated crustal subsidence along the Yellowstone hotspot track

et al. 2016

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“…Most occurrences are of AP2 aggregates (e.g., McPhie, 1986;Schumacher and Schmincke, 1991;Ui et al, 1992;Sohn, 1996;Baer et al, 1997;Colella and Hiscott, 1997;De Rita et al, 2002;Palladino et al, 2001;Scolamacchia et al, 2005;Branney et al, 2007;Brown et al, 2007;Andrews et al, 2008;Brown et al, 2010;Ellis and Branney, 2010). AP2 aggregates are commonly found within the matrices of PDC deposits or clastsupported in discontinuous layers or lenses within bedded PDC deposit (Fig.…”

Section: Stratigraphic Context Of Accretionary Pellets (Ap) In Pyroclmentioning

confidence: 99%

A review of volcanic ash aggregation

Brown

Bonadonna

Durant

2012

Physics and Chemistry of the Earth, Parts A/B/C

237

298

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. (2012) 'A review of volcanic ash aggregation.', Physics and chemistry of the earth, parts A/B/C., 45-46 . pp. 65-78. Further information on publisher's website:http://dx.doi.org/10.1016/j.pce. 2011.11.001 Publisher's copyright statement:Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractMost volcanic ash particles with diameters < 63 µm settle from eruption clouds as particle aggregates that cumulatively have larger sizes, lower densities, and higher terminal fall velocities than individual constituent particles. Particle aggregation reduces the atmospheric residence time of fine ash, which results in a proportional increase in fine ash fallout within 10s km to 100s km from the volcano and a reduction in airborne fine ash mass concentrations 1000s km from the volcano. Aggregate characteristics vary with distance from the volcano: proximal aggregates are typically larger (up to cm size) with concentric structures, while distal aggregates are typically smaller (sub-millimetre size). Particles comprising ash aggregates are bound through hydro-bonds (liquid and ice water) and electrostatic forces, and the rate of particle aggregation correlates with cloud liquid water availability. Eruption source parameters (including initial particle size distribution, erupted mass, eruption column height, cloud water content and temperature) and the eruption plume temperature lapse rate, coupled with the environmental parameters, determines the type and spatiotemporal distribution of aggregates. Field studies, lab experiments and modelling investigations have already provided important insights on the process of particle aggregation. However, new integrated observations that combine remote sensing studies of 2 ash clouds with field measurement and sampling, and lab experiments are required to fill current gaps in knowledge surrounding the theory of ash aggregate formation. Abstract word count: 222

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Magnetic anisotropy in rhyolitic ignimbrite, Snake River Plain: Implications for using remanent magnetism of volcanic rocks for correlation, paleomagnetic studies, and geological reconstructions

et al. 2015

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Individual ignimbrite cooling units in southern Idaho display significant variation of magnetic remanence directions and other magnetic properties. This complicates paleomagnetic correlation. The ignimbrites are intensely welded and exhibit mylonite-like flow banding produced by rheomorphic ductile shear during emplacement, prior to cooling below magnetic blocking temperatures. Glassy vitrophyric lithologies commonly have discrepantly shallow remanence directions rotated closer to the orientation of the subhorizontal shear fabric when compared to the microcrystalline center of the same cooling unit. To investigate this problem, we conducted a detailed paleomagnetic and rock magnetic study of a vertical profile through a single ignimbrite cooling unit and its underlying baked soil. The results demonstrate that large anisotropy of thermal remanent magnetization correlates with large (up to 38°) deflections of the stable remanence direction. Anisotropy of magnetic susceptibility revealed no strong anisotropy. A strong lineation and deflection of the remanence declination suggest that rheomorphic shear above magnetic blocking temperatures is the dominant mechanism controlling the formation of the magnetic fabric, with compaction contributing to a lesser extent. Nucleation and growth of anisotropic fine-grained magnetite in volcanic glass at high temperatures after, and perhaps also during, emplacement is indicated by systematic variation of magnetic properties from the quickly chilled ignimbrite base to the interior. These properties include remanence directions, anisotropy, coercivity, susceptibility, strength of natural remanent magnetization, and dominant unblocking temperature. The microcrystalline ignimbrite center has a magnetic direction that is the same as the underlying baked soil and, therefore, is a more reliable recorder of the paleofield direction than the glassy margins of highly welded ignimbrites.

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Rhyolitic ignimbrites in the Rogerson Graben, southern Snake River Plain volcanic province: volcanic stratigraphy, eruption history and basin evolution

Abstract: The 80 km long NNE-trending Rogerson

Cited by 50 publications

References 50 publications

Rheomorphic ignimbrites of the Rogerson Formation, central Snake River plain, USA: record of mid-Miocene rhyolitic explosive eruptions and associated crustal subsidence along the Yellowstone hotspot track

Rheomorphic ignimbrites of the Rogerson Formation, central Snake River plain, USA: record of mid-Miocene rhyolitic explosive eruptions and associated crustal subsidence along the Yellowstone hotspot track

A review of volcanic ash aggregation

Magnetic anisotropy in rhyolitic ignimbrite, Snake River Plain: Implications for using remanent magnetism of volcanic rocks for correlation, paleomagnetic studies, and geological reconstructions

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