Fallout tuffs of Trapper Creek, Idaho—A record of Miocene explosive volcanism in the Snake River Plain volcanic province

Perkins, Michael E.; Nash, W. P.; Brown, Francis H.; Fleck, Robert J.

doi:10.1130/0016-7606(1995)107<1484:ftotci>2.3.co;2

Cited by 147 publications

(134 citation statements)

References 0 publications

Supporting

Mentioning

128

Contrasting

Order By: Relevance

“…Firstly, the statistical distance SD(D 2 ) test of Perkins (1995Perkins ( , 1998 which utilises the mean and standard deviations for the 10 elements that exceed 0.1 wt%, demonstrates that none of the correlations being tested are statistically different at the 99 % confidence interval as the D 2 values do not exceed the critical value of 23.21. Secondly, the use of the similarity coefficient (SC) function of Borchardt (1972), which compares the average values for the 7 major elements exceeding 1 wt%, highlights the strong similarities between the correlated deposits as SC values all exceed 0.95.…”

Section: S O Rasmussen Et Al: a First Chronology For The Neem Ice mentioning

confidence: 99%

A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core

et al. 2013

View full text Add to dashboard Cite

Abstract.A stratigraphy-based chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core has been derived by transferring the annual layer counted Greenland Ice Core Chronology 2005 (GICC05) and its model extension (GICC05modelext) from the NGRIP core to the NEEM core using 787 match points of mainly volcanic origin identified in the electrical conductivity measurement (ECM) and dielectrical profiling (DEP) records. Tephra horizons found in both the NEEM and NGRIP ice cores are used to test the matching based on ECM and DEP and provide five additional horizons used for the timescale transfer.A thinning function reflecting the accumulated strain along the core has been determined using a DansgaardJohnsen flow model and an isotope-dependent accumulation rate parameterization. Flow parameters are determined from Monte Carlo analysis constrained by the observed depth-age horizons.In order to construct a chronology for the gas phase, the ice age-gas age difference ( age) has been reconstructed using a coupled firn densification-heat diffusion model. Temperature and accumulation inputs to the age model, initially derived from the water isotope proxies, have been adjusted to optimize the fit to timing constraints from δ 15 N of nitrogen and high-resolution methane data during the abrupt onset of Greenland interstadials.The ice and gas chronologies and the corresponding thinning function represent the first chronology for the NEEM core, named GICC05modelext-NEEM-1. Based on both the flow and firn modelling results, the accumulation history for the NEEM site has been reconstructed. Together, the timescale and accumulation reconstruction provide the necessary basis for further analysis of the records from NEEM.

show abstract

Section: S O Rasmussen Et Al: a First Chronology For The Neem Ice mentioning

confidence: 99%

A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Tephra correlations involved petrographic and geochemical assessment of volcanic glass shards conducted at the University of Utah using the methods detailed in Perkins et al (1995Perkins et al ( , 1998 and Perkins (2014). We collected 33 tephra samples; their correlations, ages, and sample locations are presented in Table 2 and are shown on geologic maps and cross sections in Figures 3, 4, 7-9.…”

Section: Age Of the Humboldt Formation In The Knoll Mountain Areamentioning

confidence: 99%

Middle Miocene to Holocene tectonics, basin evolution, and paleogeography along the southern margin of the Snake River Plain in the Knoll Mountain–Ruby–East Humboldt Range region, northeastern Nevada and south-central Idaho

2017

View full text Add to dashboard Cite

New geologic mapping and tephrochronologic assessment of strata in extensional basins surrounding Knoll Mountain (Nevada, USA) reveal a geologic history linked to tectonic development of the Yellowstone hotspot and Snake River Plain to the north, and to the Ruby-East Humboldt-Wood Hills metamorphic core complex to the south. Data from these areas are utilized to present a paleogeographic reconstruction of northeastern Nevada-southcentral Idaho depicting the architecture of extensional faulting and basin development during collapse of the Nevadaplano over the past 17 m.y.Knoll Mountain is a northeast-trending horst along the southern margin of the Snake River Plain and track of the Yellowstone hotspot. The horst is bounded on the east by the Thousand Springs fault system and basin, and on the west by the Knoll Mountain fault and basin, where streams currently drain north into the Snake River Plain. The Knoll and Thousand Springs basins form half-grabens that are filled with the ca. 16 Ma to ca. 8-5 Ma Humboldt Formation, which was deposited in alluvial, eolian, and lacustrine environments during slip along range-bounding faults and a series of late-stage synthetic intrabasin faults. Structural, chronologic, and sedimentologic assessment of the Humboldt Formation in the Knoll basin indicates that it records overall southward fluvial drainage with slip along the Knoll Mountain fault beginning ca. 16 Ma and continuing to at least 8 Ma, and that between 8 and ca. 5 Ma, a west-dipping intrabasin fault system had developed. Between ca. 8-5 Ma to ca. 3 Ma, several fundamental changes took place, beginning with the cessation of faulting followed by widespread erosion that in turn was followed by deposition of older alluvium. The reversal of drainage direction from south to north flowing in the Knoll basin also took place during this time period, but its age relative to the widespread erosion or older alluvium is unknown.An integration of our work with previous studies north of Knoll Mountain reveal that the Knoll Mountain and intrabasin faults terminate to the north in the vicinity of the Jurassic Contact pluton, and that this area forms an accommodation zone separating broadly coeval and colinear faults bounding the ca. 10-8 Ma north-trending Rogerson graben, the northern end of which merges with the Snake River Plain. Furthermore, an integration of our work with previous work south of Knoll Mountain reveals that the Knoll Mountain fault formed part of a >190-km long, west-dipping fault zone that included the Ruby-East Humboldt detachment. This fault zone, which we refer to as the Knoll-Ruby fault system, had an extensive hanging-wall basin, the KnollRuby basin. The Knoll-Ruby fault system was a prominent structure facilitating collapse of the Nevadaplano in northeastern Nevada between ca. 16 and ca. 8-5 Ma, and its central part produced partial exhumation of high-grade, mid-crustal metamorphic rocks in the Ruby-East Humboldt-Wood Hills metamorphic core complex. By 8-5 Ma, during the waning stages of extension a...

show abstract

“…In order to confirm the correlations between tephras reported in this study and those from other areas in Antarctica, we have calculated the Euclidean distance function, D, for element concentrations in volcanic glass normalized by standard deviations (Perkins et al 1995). Dunber and Kurbatov (2011) applied the distance function with 6 elements (i.e., Fe, Ca, Ti, Mg, Mn and K) for Antarctic ice samples, which are also used for the tephras reported in this study.…”

Section: Origin Of Volcanic Ash In Tephra-bearing Ice Blockmentioning

confidence: 61%

“…Correlation is based on major and trace elements by Kohno et al (2004) D value is calculated based on Perkins et al (1995) …”

Section: Rock Magnetic Granulometry Of Volcanic Ashmentioning

confidence: 99%

Volcanic ash in bare ice south of Sør Rondane Mountains, Antarctica: geochemistry, rock magnetism and nondestructive magnetic detection with SQUID gradiometer

Oda

Miyagi

Kawai

et al. 2016

Earth Planets Space

View full text Add to dashboard Cite

Nondestructive magnetic detection of tephra layers in ice cores will be an important method to identify and correlate stratigraphic horizons of ice bearing volcanic ash particles. Volcanic ash particles were extracted from tephra-bearing ice samples collected from Nansen Ice Field south of the Sør Rondane Mountains, Antarctica. Particles are fresh glassy volcanic ash with diameters of ~50 μm, and chemical composition of the matrix glass belongs to a low-K basaltic andesite group, ranging from SiO 2 60-62 wt% and K 2 O 0.40-0.50 wt%. Considering the grain size of ash particles and chemical composition of volcanic glass, the ash in tephra-bearing ice samples might be originated from the South Sandwich Islands located 2800 km northwest of the sampling sites. Correlations on major element concentrations with tephra layers associated with South Sandwich Islands in EPICA-Dome C, Vostok, and Dome Fuji ice cores show high similarity. Rock magnetic experiments show that the magnetic mineral is pseudo-single-domain titanomagnetite with ulvospinel content of 0.2-0.35 mixed with single-domain to superparamagnetic (titano)magnetite. Small blocks of the tephra-bering ice were measured with a SQUID gradiometer at 1-mm intervals with a spatial resolution of ~3 mm. With DC magnetic field of 25 mT, magnetic signal could be enhanced and detected for all the samples including the one with invisible amount of tephra particles. In order to simulate a thin ash layer in ice core, volcanic ash particles extracted from the tephra-bearing ice were used to fabricate a thin ash layer, which were subsequently magnetized, measured with the gradiometer. The noise level for Z axis gradiometer was about 0.6 pT. Detection limit for a half-cylinder with 29 mm radius and a thickness of 1 mm uniformly magnetized in X axis direction is ~9 × 10

show abstract

Fallout tuffs of Trapper Creek, Idaho—A record of Miocene explosive volcanism in the Snake River Plain volcanic province

Cited by 147 publications

References 0 publications

A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core

A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core

Middle Miocene to Holocene tectonics, basin evolution, and paleogeography along the southern margin of the Snake River Plain in the Knoll Mountain–Ruby–East Humboldt Range region, northeastern Nevada and south-central Idaho

Volcanic ash in bare ice south of Sør Rondane Mountains, Antarctica: geochemistry, rock magnetism and nondestructive magnetic detection with SQUID gradiometer

Contact Info

Product

Resources

About