In Situ-Produced Cosmogenic Nuclides and Quantification of Geological Processes

Nishiizumi, C. Kohl, J. Arnold, Ronald Dorn , I. Klein, D. Fink, R. Middleton, D. The central premises of applications of the in situ cosmogenic dating method for studying specific problems in geomorphology are outlined for simple and complex exposure settings. Role of in situ cosmogenic nuclides 10 be and 26 al in the study of diverse geomorphic processes.

Dating Pleistocene deltaic deposits using in-situ 26Al and 10Be cosmogenic nuclides

Diarmad G. N2 – We successfully apply exposure dating using cosmogenic nuclides to natural terrain landslides in Hong Kong. Forty-five samples from eight landslide sites were exposure dated using 10Be, and a subset of six samples was also dated using 26Al.

playing a major role in dating and quantifying rates of landscape change over cosmogenic 10Be and 26Al dating of strath terraces and two large (>10 million.

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Universität zu Köln

The interaction of cosmic radiation with terrestrial matter leads to the in-situ production of cosmogenic nuclides in the exposed surface material. Accelerator mass spectrometry AMS enables us to quantitatively measure trace concentrations of in-situ produced radionuclides like 10 Be and 26 Al. This ultimately allows the determination of surface exposure ages, erosion rates and other processes of landscape evolution.

The availability of a pure and well defined mineral sample is an important prerequisite for surface exposure dating.

Anderson, R. S., Repka, J. L. and Dick, G. S. Explicit treatment of inheritance in dating depositional surfaces using in situ 10Be and 26Al. Geology

Only the ages of lower terraces were previously delimited by 14C. The highest elevation terraces T 8 , T 9 were sampled for cosmogenic 26AlBe burial dating to delimit the ages of previously identified faults, and possibly locate evidence of faults that may displace the terraces. Samples were collected from four locations 5 samples in each location, 20 samples total on both the north and south sides of the reservoir near previously identified faults.

Session No. These faults have NE-striking, SE-dipping orientations, contain characteristic red sandy clay-filled fault gouge, and are a part of deformation zone. Geological Society of America Abstracts with Programs. Permission is hereby granted to the author s of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information.

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Cosmogenic 26Al/10Be burial dating of the Paleolithic at Xihoudu, North China.

To browse Academia. Skip to main content. Log In Sign Up. Download Free PDF. Guanjun Shen.

Abstract The assumed value for the cosmogenic 26Al/10Be surface production rate ratio in quartz is an important parameter for studies.

This proposal seeks funding for measurement of the cosmogenic radionuclides 26Al and 10Be in quartz from core and outcrop of Plio-Pleistocene sediment within and near Unaweep Canyon. The Plio-Pleistocene sediments were newly mapped in , and the core was collected in Our preliminary data indicate that Unaweep Canyon is a Paleozoic landform buried by later Paleozoic and Mesozoic sediments and then re-exhumed during the Cenozoic, a controversial claim. Despite considerable age-dating efforts in our previous research, we have found no material in this sedimentary succession that can be dated using conventional methods.

Thus, the purpose of this proposal is to apply newly developed methods of? Successful dating of the target sediments will yield three tangible benefits. First, it will solve a significant regional geologic problem by establishing the timeline of geomorphic events and will yield insight into the rate and nature of Cenozoic fluvial incision of the Colorado Plateau? Second, it will help to move a newly developed dating method from the developmental stage into practical applications.

This work will also result in significant broader impacts, including strengthening interdisciplinary collaborations, exposing students to cutting-edge techniques, and disseminating the research via publication and classroom use. This project is?

Surface exposure dating

Ciampalini, A. Quaternary Geochronology , 28, pp. The present study aims at testing the possibility of using the in-situ cosmogenic burial dating technique on deltaic deposits. The sequence analyzed is exposed along the Ligurian coast north-west Italy and is made of proximal marine and continental deposits previously considered Pliocene or Plio-Quaternary in age. In the study area two allostratigraphic units were recognized.

The lower unit represents the evolution of a small coarse-grained delta developed in a fjord or embayment environment.

Abstract. The present study aims at testing the possibility of using the in-situ cosmogenic burial dating technique on deltaic deposits.

Darryl E. Granger, Multiple cosmogenic nuclides with different decay rates can be used to date exposure and burial of rocks over the timescales of radioactive decay. Two classes of terrestrial applications are discussed in detail. The first involves the use of 26 Al and 10 Be in rock or sediment that has experienced a complex history of repeated exposure and burial. In these cases, the cosmogenic nuclides can only provide a minimum near-surface age.

Examples include sediment from beneath desert sand dunes, and rocks from beneath cold-based glaciers. The second class of application uses 26 Al and 10 Be to date discrete burial events, in cases where sediment has experienced a simple history of exposure followed by rapid burial. Examples include cave sediments, alluvial deposits, and sediment buried beneath glacial till.

Finally, the half-lives of 26 Al and 10 Be are discussed, with special attention given to discrepant estimates of the 10 Be half-life. It is shown that geologic data are consistent with either half-life estimate of 1. Shibboleth Sign In. OpenAthens Sign In. Institutional Sign In.

Cosmogenic 26Al/10Be burial dating of the Paleolithic at Xihoudu, North China

One particularly widely applied system compares the ratio of 26Al to 10Be in samples that have been exposed at the surface of the earth and then buried. While this ratio has been estimated before, its value is not well known and appears to vary around the world. The new data will also allow much better understanding of the uncertainty of these ages. This work will train a graduate student in science and will improve dates of ancient human remains as well as past changes in Earth’s climate, including the coming and going of glaciers.

The team will do this by making high-precision 26Al analyses of archived samples already prepared and previously analyzed for 10Be.

Incision rate of the Yellow River in Northeastern Tibet constrained by 10Be and 26Al cosmogenic isotope dating of fluvial terraces: implications for catchment.

Descaretes, Strasbourg Cedex. Late Pleistocene—Holocene sinistral slip-rates on several segments of the Kunlun Fault in northeastern Tibet have been determined. These determinations are based on the measured displacement of alluvial surfaces whose surface ages were determined by cosmogenic 26 Al and 10 Be dating of quartz pebbles, and by 14 C dating of charcoal. Farther east, near The slip-rates are constant, within uncertainty, throughout the km of the Kunlun Fault that we studied.

The average slip-rate is Extrapolating this rate to the reminder of the fault, we conclude that most 80 per cent of the morphological offsets measured in the field or on SPOT satellite images post-date the Last Glacial Maximum. Most of the terraces we studied were deposited during the humidperiod of the Early Holocene Optimum 9—5 ka ; the formation of younger terraces reflects Late Holocene climate change. Their great lateral extent and spatial relationship to high-angle shortening features large thrusts and growing mountain ranges suggest that they play a major role in accommodating Indo-Asian convergence e.

Tapponnier et al. An accurate knowledge of the slip-rates along these faults of northern Tibet is essential to assess the large-scale mechanical behaviour of the crust and mantle beneath the plateau, and to test the predictions of various controversial models e. Seismotectonic map of northern Tibet. Inset shows the location of the map within the India-Asia collision framework.

Cosmogenic nuclide dating

Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. DOI: The precise age and distribution of hominins in East Asia, some thousand kilometers from Africa, are important constraints on the route of migration Norton et al.


In cooperation with Prof. Tibor Dunai University of Cologne , Dr. Ulrich Hambach University of Bayreuth ;. Gerd-Christian Weniger, Prof. Dating of tsunami deposits on the Cape Verde Islands. Project funded by the Dr. Simon Matthias May, Dr. Max Engel both University of Cologne and Dr. Raphael Paris University of Clermont-Ferrand.

May, S. Chronological and geoarchaeological investigations on an anthropogenic shell accumulation layer in the Longotoma dune field Central Chile. Quaternary International , Rixhon, G.

Radiocarbon dating

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