Cosmogenic-nuclide burial ages for Pleistocene sedimentary fill in Unaweep Canyon, Colorado, USA

Balco, Greg; Soreghan, Gerilyn S.; Sweet, Dustin E.; Marra, Kristen R.; Bierman, Paul R.

doi:10.1016/j.quageo.2013.02.002

Cited by 61 publications

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References 14 publications

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“…Also, model results suggest vertical slip rates of the Alhama de Murcia fault system of about 36 mm ka −1 or greater. and Balco et al (2013). Table 3: Surface exposure and CSEB models results (υ = 12 data -4 parameters = 8 degrees of freedom).…”

Section: Discussionmentioning

confidence: 99%

“…Granger and Muzikar (2001) used 3 exponential curves to fit muon production rates. However, 2 exponential curves yield a good fit at near surface conditions (Heisinger et al, 2002a,b;Balco et al, 2013). Depth can also be expressed as x = ρ · z, where z is the current profile depth in cm and ρ is the mean density of the rock or sediment in g cm -3 .…”

Section: Surface Exposure Modelmentioning

confidence: 99%

“…and Rovey (2008), modified to fit muon interaction cross-sections described in Braucher et al (2013), Balco et al (2013) and references therein. Thus, instead of the original values determined experimentally by Heisinger, we used the following values in the CRONUS Matlab code: k neg10=1.2916e-04, k neg26=0.0016, sigma190 10=3.7822e-29, sigma190 26=6.9599e-28.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

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Combining surface exposure dating and burial dating from paired cosmogenic depth profiles. Example of El Límite alluvial fan in Huércal-Overa basin (SE Iberia)

Rodés

Pallàs

Ortuño

et al. 2014

Quaternary Geochronology

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Please cite this article as: Rod´es, A., Pall`as, R., Ortu˜no, M.´ı., Garc´ıa-Melendez, E., Masana, E.`a., Combining surface exposure dating and burial dating from paired cosmogenic depth profiles. Example of El Límite alluvial fan in Huércal-Overa basin (SE Iberia), Quaternary Geochronology (2013), doi: 10.1016/j.quageo.2013 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPTCombined surface exposure and burial dating provides robust minimum and maximum ages. It also provides constraints for the exhumation rate and sediment residence time. Results suggest that El Límite alluvial fat was deposited in the Late Pleistocene. El Límite sediments were reworked due to the activity of the South-AMF. M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPTCombining surface exposure dating and burial dating from paired cosmogenic depth profiles.Example of El Límite alluvial fan in Huércal-Overa basin (SE Iberia)Several authors * October 1, 2013Abstract Cosmogenic nuclide depth-profiles are used to calculate the age of landforms, the rates at which erosion has affected them since their formation and, in case of deposits, the paleo-erosion rate in the source area. However, two difficulties are typically encountered: 1) old deposits or strongly affected by cosmogenic nuclide inheritance often appear to be saturated, and 2) a full propagation of uncertainties often yields poorly constrained ages. Here we show how to combine surface-exposure-dating and burial-dating techniques in the same profile to get more accurate age results and to constrain the extent of pre-depositional burial periods. A 10 Be-26 Al depth-profile measured in an alluvial fan of SE Iberia is presented as a natural example.

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Section: Discussionmentioning

confidence: 99%

Section: Surface Exposure Modelmentioning

confidence: 99%

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

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Combining surface exposure dating and burial dating from paired cosmogenic depth profiles. Example of El Límite alluvial fan in Huércal-Overa basin (SE Iberia)

Rodés

Pallàs

Ortuño

et al. 2014

Quaternary Geochronology

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“…O método da isócrona (Balco & Rovey, 2008) é uma boa alternativa para investigação geocronológica de estratos e sedimentos não plenamente recobertos e protegidos da penetração dos raios cósmicos, embora seu emprego seja ainda muito restrito na literatura. Inicialmente utilizado em uma investigação no contexto glacial (Balco & Rovey, 2008), o método da isócrona também foi posteriormente empregado em terraços fluviais e marinhos (Erlanger et al, 2012;Balco et al, 2013).…”

Section: Aplicações Em Geociênciasunclassified

DATAÇÃO DE SOTERRAMENTO UTILIZANDO OS ISÓTOPOS COSMOGÊNICOS 10Be E 26Al: SÍNTESE METODOLÓGICA E BREVE REVISÃO DE SUAS APLICAÇÕES EM GEOCIÊNCIAS

Laureano

Granger

Karmann

et al. 2014

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Recebido em 7 de agosto de 2014; aceito em 23 de março de 2015Resumo: Isótopos cosmogênicos são formados na atmosfera, na superfície e nos primeiros metros da crosta terrestre através da colisão de partículas sub-atômicas com núcleos de elementos químicos ali existentes. Entre um largo espectro de isótopos gerados 10 Be e 26 Al produzidos no interior do mineral quartzo podem ser utilizados para calcular o soterramento de sedimentos e superfícies geológicas previamente expostos aos raios cósmicos. Três diferentes abordagens podem ser evocadas na obtenção de idades: (i) o soterramento simples para quando há um soterramento completo das amostras (> 10m); (ii) idades máximas e mínimas quando as amostras não se encontram a uma profundidade suficiente para interromper a produção pós-soterramento destes isótopos e (iii) o método da isócrona derivado de uma solução gráfica onde múltiplas amostras de uma mesma camada são utilizadas para obtenção de uma idade. Além das idades em si o emprego destes isótopos carrega outro importante resultado em estudos geomorfológicos, quer seja a taxa de erosão pré-soterramento. O método possui um alcance compreendido entre 100 mil e 4-5 milhões de anos antes do presente e uma resolução nunca inferior a 60 mil anos. A literatura registra a obtenção de idades em sedimentos de caverna, terraços fluviais, dunas, solos, entre outros, e soma resultados no campo da determinação de taxas de incisão fluvial, no balizamento geocronológico da evolução do modelado, na investigação da dinâmica de solos, bem como em investigações paleoclimáticas e arqueológicas. Al generated inside quartz grains may be used in burial dating of sediments or geological surfaces previously exposed to cosmic rays. Three different approaches can be used for age determinations: (i) simple burial dating when samples are totally buried from cosmic rays; (ii) minimum and maximum ages when samples did not get deep enough to avoid post burial production and (iii) an isochron method derived from a graphical solution where multiple samples from a single layer are used to obtain a single burial age. Burial dating also brings to light another important geomorphic result: the pre-burial erosion rate. The method can be applied in samples buried in a range of 100 thousand to 4-5 million years ago, with a resolution limited to about 60 thousand years. The literature records burial ages from cave sediments, fluvial terraces, dunes, soil related materials, and others, allowing researchers to constrain river incision rates, landscape evolution, soil dynamics and paleoclimate and archeological issues as well. Palavras-chave:

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“…The key parameters for the production rates, i.e. probability factors and effective cross sections, were taken from Balco et al 17 , where they are given without error limits, making error propagation difficult. We did not fix the 26 Al/ 10 Be production rate, but calculated 26 Al and 10 Be separately.…”

mentioning

confidence: 99%

age of fossil StW573 (‘Little Foot’): Reply to comments by Stratford et al. (2017)

Kramers¹,

Dirks²

2017

S. Afr. J. Sci.

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Cosmogenic-nuclide burial ages for Pleistocene sedimentary fill in Unaweep Canyon, Colorado, USA

Cited by 61 publications

References 14 publications

Combining surface exposure dating and burial dating from paired cosmogenic depth profiles. Example of El Límite alluvial fan in Huércal-Overa basin (SE Iberia)

Combining surface exposure dating and burial dating from paired cosmogenic depth profiles. Example of El Límite alluvial fan in Huércal-Overa basin (SE Iberia)

DATAÇÃO DE SOTERRAMENTO UTILIZANDO OS ISÓTOPOS COSMOGÊNICOS 10Be E 26Al: SÍNTESE METODOLÓGICA E BREVE REVISÃO DE SUAS APLICAÇÕES EM GEOCIÊNCIAS

age of fossil StW573 (‘Little Foot’): Reply to comments by Stratford et al. (2017)

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