Isotopic evidence for the diversity of late Quaternary loess in Nebraska: Glaciogenic and nonglaciogenic sources

Aleinikoff, John N.; Muhs, Daniel R.; Bettis, E. Arthur; Johnson, William C.; Benton, Rachel

doi:10.1130/b26222.1

Cited by 73 publications

(59 citation statements)

References 63 publications

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“…These trends permit an interpretation of Missouri River infl uence on loess composition within ~30 km of the river, at least for some minerals such as micas, feldspars, and carbonates. This interpretation is consistent with thickness observations made by Mason (2001) and Mason et al (2007) and isotopic compositions reported by Aleinikoff et al (2008). However, because of where our transect is located (Fig.…”

Section: Peoria Loess Localities Near the Missouri River In Nebraskasupporting

confidence: 82%

“…We also compare our results with a recent dust-cycle simulation model presented by Mahowald et al (2006) and a recent climate model presented by Bromwich et al (2005). Our results complement isotopic studies contained in a companion paper (Aleinikoff et al, 2008).…”

Section: Introductionsupporting

confidence: 77%

“…Thus, it seems unlikely that the Platte River system had a signifi cantly different course during the last glacial period. Locally, the Platte River system probably contributed some sediment to the loess bodies, a conclusion also reached by Mason (2001) and Aleinikoff et al (2008), and inferred from the spatial variability in loess particle size presented herein. We conclude from all these considerations that loess in Nebraska, both north and south of the Platte River system, had a common source or sources that lay upwind of both loess bodies.…”

Section: Potential Sources Of Peoria Loess In Nebraskamentioning

confidence: 57%

“…However, both mineralogy and geochemistry indicate little or no overlap in the composition of the Nebraska Sand Hills and Peoria Loess. Isotopic data from K-feldspars also indicate little infl uence from the Nebraska Sand Hills on loess composition (Aleinikoff et al, 2008). Contributions from the Nebraska Sand Hills are apparent in the particle size data presented here, but may have been limited to a very narrow band close to the dune fi eld, where local enrichments of sandsized quartz took place.…”

Section: Nebraska Sand Hillsmentioning

confidence: 78%

“…However, even in those loess sections of eastern Nebraska that are adjacent to the Missouri River (Bellevue and Plattsmouth), there is evidence for only partial contributions from this source. Such local contributions, however, are also apparent in the thickness data of Swinehart et al (1994a), Mason (2001), and Mason et al (2007), and in the isotopic data of Aleinikoff et al (2008).…”

Section: Outwash From the Laurentide Ice Sheet Via The Missouri Rivermentioning

confidence: 81%

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Origin and paleoclimatic significance of late Quaternary loess in Nebraska: Evidence from stratigraphy, chronology, sedimentology, and geochemistry

Muhs

Bettis

Aleinikoff

et al. 2008

Geological Society of America Bulletin

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129

104

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Rachel, "Origin and paleoclimatic signifi cance of late Quaternary loess in Nebraska: Evidence from stratigraphy, chronology, sedimentology, and geochemistry" (2008 The spatial variability of particle size abundances in Peoria Loess shows a northwest-to-southeast fi ning in Nebraska, consistent with maps of previous workers that show a northwest-to-southeast thinning of loess. These observations indicate that paleowinds that deposited the loess were from the west or northwest and that the source or sources of Peoria Loess lay to the west or northwest.New mineralogical and geochemical data indicate that the most important sources of loess were likely Tertiary siltstones of the White River and Arikaree Groups, silt facies of Pliocene eolian sediments, and small contributions from Pierre Shale. It is likely that fi ne-grained silts were transported episodically through the Nebraska Sand Hills from

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Section: Peoria Loess Localities Near the Missouri River In Nebraskasupporting

confidence: 82%

Section: Introductionsupporting

confidence: 77%

Section: Potential Sources Of Peoria Loess In Nebraskamentioning

confidence: 57%

Section: Nebraska Sand Hillsmentioning

confidence: 78%

Section: Outwash From the Laurentide Ice Sheet Via The Missouri Rivermentioning

confidence: 81%

See 3 more Smart Citations

Origin and paleoclimatic significance of late Quaternary loess in Nebraska: Evidence from stratigraphy, chronology, sedimentology, and geochemistry

Muhs

Bettis

Aleinikoff

et al. 2008

Geological Society of America Bulletin

Self Cite

129

104

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European glacial dust deposits: Geochemical constraints on atmospheric dust cycle modeling

Rousseau

Chauvel

Sima

et al. 2014

Geophysical Research Letters

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For a long time global paleodust numerical simulations have greatly underestimated dust sources other than modern deserts. Recent modeling experiments incorporating glaciogenic sources of dust have positively improved the agreement between model and paleodust data. This highlights the importance of accurately representing all areas potentially subjected to deflation during an investigated interval. Geochemical results, obtained from European loess sequences collected along a 50°N transect, combined with dust emission simulations reveal the geographical distribution of the most important European dust sources between 34 ka and 18 ka. We demonstrate that most European dust traveled only a few hundred kilometers or less within the boundary layer from its source before deposition. We conclude that our results encourage acquisition of similar geochemical data for other relevant areas in the world. Further, they could provide critical constraints to benchmark atmospheric models, contributing to improve their performance in simulating dust cycle and associated climate feedbacks.

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Dust fluxes and iron fertilization in Holocene and Last Glacial Maximum climates

Lambert

Tagliabue

Shaffer

et al. 2015

Geophysical Research Letters

108

131

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Mineral dust aerosols play a major role in present and past climates. To date, we rely on climate models for estimates of dust fluxes to calculate the impact of airborne micronutrients on biogeochemical cycles. Here we provide a new global dust flux data set for Holocene and Last Glacial Maximum (LGM) conditions based on observational data. A comparison with dust flux simulations highlights regional differences between observations and models. By forcing a biogeochemical model with our new data set and using this model's results to guide a millennial‐scale Earth System Model simulation, we calculate the impact of enhanced glacial oceanic iron deposition on the LGM‐Holocene carbon cycle. On centennial timescales, the higher LGM dust deposition results in a weak reduction of <10 ppm in atmospheric CO2 due to enhanced efficiency of the biological pump. This is followed by a further ~10 ppm reduction over millennial timescales due to greater carbon burial and carbonate compensation.

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Isotopic evidence for the diversity of late Quaternary loess in Nebraska: Glaciogenic and nonglaciogenic sources

Abstract: Pb isotope compositions of detrital K-feldspars and U-

Cited by 73 publications

References 63 publications

Origin and paleoclimatic significance of late Quaternary loess in Nebraska: Evidence from stratigraphy, chronology, sedimentology, and geochemistry

Origin and paleoclimatic significance of late Quaternary loess in Nebraska: Evidence from stratigraphy, chronology, sedimentology, and geochemistry

European glacial dust deposits: Geochemical constraints on atmospheric dust cycle modeling

Dust fluxes and iron fertilization in Holocene and Last Glacial Maximum climates

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