Architecture, heterogeneity, and origin of late Miocene fluvial deposits hosting the most important aquifer in the Great Plains, USA

Joeckel, R.M.; Wooden, S.R.; Korus, Jesse T.; Garbisch, J.O.

doi:10.1016/j.sedgeo.2014.07.002

Cited by 21 publications

(9 citation statements)

References 97 publications

(83 reference statements)

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“…However, based on more recent studies, Smith's (1965) statement about induration in the Ogallala Formation is actually oversimplified. Joeckel et al (2014) conducted detailed sedimentological studies of the Ash Hollow Formation, which in the stratigraphic nomenclature for Nebraska is the youngest and most widespread unit, and one of the thickest within what is referred to in their paper as the Ogallala Group. These investigators point out (Joeckel et al, 2014, p. 79) that very fine to fine-grained sandstone is the predominant facies in this formation, it is well-sorted, and it is only weakly cemented.…”

Section: Origin Of the Nebraska Sand Hillsmentioning

confidence: 99%

Evaluation of simple geochemical indicators of aeolian sand provenance: Late Quaternary dune fields of North America revisited

Muhs

2017

Quaternary Science Reviews

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Dune fields of Quaternary age occupy large areas of the world's arid and semiarid regions. Despite this, there has been surprisingly little work done on understanding dune sediment provenance, in part because many techniques are time-consuming, prone to operator error, experimental, highly specialized, expensive, or require sophisticated instrumentation. Provenance of dune sand using K/Rb and K/Ba values in K-feldspar in aeolian sands of the arid and semiarid regions of North America is tested here. Results indicate that K/Rb and K/Ba can distinguish different river sands that are sediment sources for dunes and dune fields themselves have distinctive K/Rb and K/Ba compositions. Over the Basin and Range and Great Plains regions of North America, the hypothesized sediment sources of dune fields are reviewed and assessed using K/Rb and K/Ba values in dune sands and in hypothesized source sediments. In some cases, the origins of dunes assessed in this manner are consistent with previous studies and in others, dune fields are found to have a more complex origin than previously thought. Use of K/Rb and K/ Ba for provenance studies is a robust method that is inexpensive, rapid, and highly reproducible. It exploits one of the most common minerals found in dune sand, K-feldspar. The method avoids the problem of using simple concentrations of key elements that may be subject to interpretative bias due to changes in mineralogical maturity of Quaternary dune fields that occur over time.

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Section: Origin Of the Nebraska Sand Hillsmentioning

confidence: 99%

Evaluation of simple geochemical indicators of aeolian sand provenance: Late Quaternary dune fields of North America revisited

Muhs

2017

Quaternary Science Reviews

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“…The Ogallala Group (Ogallala Formation outside of Nebraska) underlies much of the North American High Plains and consists chiefly of fluvial sand, sandstone, silt, and siltstone, with minor eolian sediments and local lenses of volcanic ash, and lacustrine limestones and diatomites [ 29 , 30 ]. The Ogallala Group is composed of several formations in Nebraska [ 31 , 32 ], but only the Valentine and Ash Hollow Formations, which comprise most of it, are recognized in the immediate vicinity of Ashfall Fossil Beds [ 23 , 31 , 33 , 34 , 35 ]. The Ashfall Konservat-Lagerstätte , is in the Cap Rock Member of the Ash Hollow Formation.…”

Section: Geologic Backgroundmentioning

confidence: 99%

First U-Pb zircon ages for late Miocene Ashfall Konservat-Lagerstätte and Grove Lake ashes from eastern Great Plains, USA

et al. 2018

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This paper documents the first U-Pb zircon ages for Ashfall Fossil Beds (Nebraska, USA), a terrestrial Konservat-Lagerstätte mass-death assemblage that is arguably the most diverse of its type and age. The Ashfall tephra was correlated with ignimbrites from the Bruneau-Jarbidge volcanic field (12.7–10.5 Ma) in southwest Idaho based on geochemical analysis. The methods and geochemical data supporting the original age assessment of the ash bed, however, were never published, and there has been a persistent misconception that dateable heavy minerals (e.g., zircon) are absent. Notwithstanding, we recovered abundant zircons from Ashfall Fossil Beds, and from an ash bed ~6 km to the southeast at Grove Lake, Nebraska, and analyzed them through LA-ICP-MS. Our new zircon U-Pb age of 11.86 ± 0.13 Ma substantiates correlation of the Ashfall Fossil Beds deposit to tuffs originating from the Bruneau-Jarbidge caldera (~12.7–10.5 Ma). Our U-Pb zircon age of 6.42 ± 0.06 Ma for the Grove Lake ash bed coincides with supervolcanic activity in the Heise volcanic field (6.6–4.3 Ma) in eastern Idaho. These new dates improve age constraints of strata comprising the Ogallala Group and the important paleontological site. Moreover, we find that detrital and airfall zircons are unevenly distributed in the stratified ash beds we describe herein and presumably in similar deposits worldwide. Therefore, a higher-resolution sampling scheme is necessary in such cases.

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“…The first regional investigation of the High Plains was conducted by the U.S. Geological Survey at the beginning of the 20 th century (Johnson, 1901). Since then, several regional studies have been conducted (e.g., Gutentag et al, 1984;Weeks et al, 1988), and a great many more localized investigations (e.g., Joeckel et al, 2014;Chaudhuri and Ale, 2014), reflecting the societal and economic importance of this very extensive aquifer system. The main part of the High Plains aquifer is contained within the Ogallala Formation, a laterally extensive unit composed of Tertiary-age alluvial fan, lacustrine and eolian deposits derived from erosion of the Rocky Mountains (Gustavson and Winkler, 1988).…”

Section: High Plains Aquifermentioning

confidence: 99%

Overview of Fresh and Brackish Water Quality in New Mexico

Land¹

2016

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Architecture, heterogeneity, and origin of late Miocene fluvial deposits hosting the most important aquifer in the Great Plains, USA

Cited by 21 publications

References 97 publications

Evaluation of simple geochemical indicators of aeolian sand provenance: Late Quaternary dune fields of North America revisited

Evaluation of simple geochemical indicators of aeolian sand provenance: Late Quaternary dune fields of North America revisited

First U-Pb zircon ages for late Miocene Ashfall Konservat-Lagerstätte and Grove Lake ashes from eastern Great Plains, USA

Overview of Fresh and Brackish Water Quality in New Mexico

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