Dating buried sediments using radioactive decay and muogenic production of 26Al and 10Be

Granger, Darryl E.; Smith, Allison L.

doi:10.1016/s0168-583x(00)00087-2

Cited by 171 publications

(157 citation statements)

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“…where Y is the 10 Be yield per stopped negative muon, A 1 and A 2 are production coefficients scaled to local atmospheric attenuation, and L 1 and L 2 are different attenuation length scales (Granger and Smith, 2000).…”

Section: Production Systematicsmentioning

confidence: 99%

“…Measurement of the ratio of 26 Al to 10 Be in deep samples from these profiles may allow erosion and age constraint (e.g. Granger and Smith, 2000), but to do so was beyond the resources available for this study.…”

Section: Surface Erosionmentioning

confidence: 99%

“…Ruler is ~30 cm long. Granger and Smith, 2000;Stone, et al, 1998 A 2 36.75 Granger and Smith, 2000;Stone, et al, 1998 L 1 738.6 g/cm 2 Granger and Smith, 2000;Stone, et al, 1998 L 2 2688 g/cm 2 Granger and Smith, 2000;Stone, et al, 1998 L 3 4360 g/cm 2 e.g., Heisinger, 1998 B 0.026 Granger andSmith, 2000;Heisinger, 1998 Site …”

Section: Notesmentioning

confidence: 99%

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New constraints on the late Cenozoic incision history of the New River, Virginia

et al. 2005

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The New River crosses the core of the ancient, tectonically quiescent Appalachian orogen as it follows its course through North Carolina, Virginia, and West Virginia. It is ideally situated to record the changes in geomorphic process rates that occur in the Appalachians as a response to late Cenozoic climate variations. Active erosion features on resistant bedrock that floors the river at prominent knickpoints demonstrate that the river is currently incising toward base level. However, large packages of alluvial fill and fluvial terraces cut into this fill record an incision history for the river that includes several periods of stalled downcutting and aggradation. Cosmogenic 10 Be exposure dating, aided by mapping and sedimentological examination of terrace deposits, is used to constrain the timing of events in this history. Fill-cut and strath terraces at elevations 10, 20, and 50 m above the modern river yield cosmogenic exposure ages of approximately 130, 610, and 955 ka, respectively, but uncertainties on these ages are not well-constrained. This translates to a long-term average incision rate of 43 m/my, which is comparable to rates measured elsewhere in the Appalachians. During specific intervals over the last 1 Ma, however, the New River's incision rate reached 97 m/my. Fluctuations between aggradation and rapid incision appear to be related to late Cenozoic climate variations, though uncertainties in modeled ages preclude direct correlation of these fluctuations to specific climate change events. Erosion rates on higher alluvial deposits adjacent to the river are estimated from 10 Be concentrations; these rates are very low, about 2 m/my or less. This demonstrates a disequilibrium in the modern landscape, with river incision greatly outpacing erosion from nearby landforms.

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Section: Production Systematicsmentioning

confidence: 99%

Section: Surface Erosionmentioning

confidence: 99%

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New constraints on the late Cenozoic incision history of the New River, Virginia

et al. 2005

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“…Cosmogenic burial dating is a technique based on the well known radioactive decay rates of cosmogenic nuclides, and is widely used in many areas of the Earth sciences and archeology (Granger and Smith, 2000). Dating materials by radioactive decay of cosmogenic nuclides requires that the sample has been completely shielded (deep burial) from cosmic radiation after the first exposure phase (e.g.…”

Section: Introductionmentioning

confidence: 99%

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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“…Diferentes modelos matemáticos veem sendo desenvolvidos no sentido de computar a produção muônica de cosmogênicos na natureza (Granger & Smith, 2000;Schaller et al, 2001;Braucher et al, 2003;Braucher et al, 2011), cujos resultados denotam um certo consenso em torno da produção há alguns poucos metros de profundidade. Entretanto, as estimativas divergem em profundidades maiores devido a diferenças na parametrização da produção adotada de autor para autor.…”

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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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Dating buried sediments using radioactive decay and muogenic production of 26Al and 10Be

Cited by 171 publications

References 6 publications

New constraints on the late Cenozoic incision history of the New River, Virginia

New constraints on the late Cenozoic incision history of the New River, Virginia

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

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