A locally calibrated, late glacial Be-10 production rate from a low-latitude, high-altitude site in the Peruvian Andes

Well-dated records of tropical glacier fluctuations are essential for developing hypotheses and testing proposed mechanisms for past climate changes. Since organic material for radiocarbon dating is typically scarce in low-latitude, high-altitude environments, surface exposure-age dating, based on t...

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Published in:Quaternary Geochronology
Main Authors: Kelly, Meredith A., Lowell, Thomas V., Applegate, Patrick J., Phillips, Fred M., Schaefer, Joerg M., Smith, Colby A., Kim, Hanul, Leonard, Katherine C., Hudson, Adam M.
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Language:unknown
Published: Oxford, Elsevier Sci Ltd 2015
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Online Access:https://doi.org/10.1016/j.quageo.2013.10.007
http://infoscience.epfl.ch/record/212294
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spelling ftinfoscience:oai:infoscience.tind.io:212294 2023-05-15T15:14:38+02:00 A locally calibrated, late glacial Be-10 production rate from a low-latitude, high-altitude site in the Peruvian Andes Kelly, Meredith A. Lowell, Thomas V. Applegate, Patrick J. Phillips, Fred M. Schaefer, Joerg M. Smith, Colby A. Kim, Hanul Leonard, Katherine C. Hudson, Adam M. 2015-09-28T07:51:12Z https://doi.org/10.1016/j.quageo.2013.10.007 http://infoscience.epfl.ch/record/212294 unknown Oxford, Elsevier Sci Ltd doi:10.1016/j.quageo.2013.10.007 ISI:000356643600008 http://infoscience.epfl.ch/record/212294 http://infoscience.epfl.ch/record/212294 Text 2015 ftinfoscience https://doi.org/10.1016/j.quageo.2013.10.007 2023-02-13T22:29:37Z Well-dated records of tropical glacier fluctuations are essential for developing hypotheses and testing proposed mechanisms for past climate changes. Since organic material for radiocarbon dating is typically scarce in low-latitude, high-altitude environments, surface exposure-age dating, based on the measurement of in situ produced cosmogenic nuclides, provides much of the chronologic information on tropical glacier moraines. Here, we present a locally calibrated Be-10 production rate for a low-latitude, high-altitude site near Quelccaya Ice Cap (similar to 13.95 degrees S, 70.89 degrees W, 4857 m asl) in the southeastern Peruvian Andes. Using an independent age (12.35 +0.2, -0.02 ka) of the late glacial Huancane Ha moraines based on thirty-four bracketing radiocarbon ages and twelve Be-10 concentrations of boulders on the moraines, we determine a local production rate of 43.28 +/- 2.69 atoms gram(-1) year (at g(-1) yr(-1)). Reference Be-10 production rates (i.e., production rates by neutron spallation appropriate for sea-level, high-latitude sites) range from 3.97 +/- 0.09 to 3.78 +/- 0.09 at g(-1) yr(-1), determined using scaling after Lal (1991) and Stone (2000) and depending on our assumed boulder surface erosion rate. Since our boulder surface erosion rate estimate is a minimum value, these reference production rates are also minimum values. A secondary control site on the Huancane Mb moraines suggests that the Be-10 production rates are at least as low as, or possibly lower than, those derived from the Huancane Ha moraines. These sea-level, high-latitude production rates are at least 11-15% lower than values derived using the traditional global calibration dataset, and they are also lower than those derived from the late glacial Breque moraine in the Cordillera Blanca of Peru. However, our sea-level, high-latitude production rates agree well with recently published, locally calibrated production rates from the Arctic, New Zealand, and Patagonia. The production rates presented here should be used to ... Text Arctic Ice cap EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne) Arctic New Zealand Patagonia Quaternary Geochronology 26 70 85
institution Open Polar
collection EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne)
op_collection_id ftinfoscience
language unknown
description Well-dated records of tropical glacier fluctuations are essential for developing hypotheses and testing proposed mechanisms for past climate changes. Since organic material for radiocarbon dating is typically scarce in low-latitude, high-altitude environments, surface exposure-age dating, based on the measurement of in situ produced cosmogenic nuclides, provides much of the chronologic information on tropical glacier moraines. Here, we present a locally calibrated Be-10 production rate for a low-latitude, high-altitude site near Quelccaya Ice Cap (similar to 13.95 degrees S, 70.89 degrees W, 4857 m asl) in the southeastern Peruvian Andes. Using an independent age (12.35 +0.2, -0.02 ka) of the late glacial Huancane Ha moraines based on thirty-four bracketing radiocarbon ages and twelve Be-10 concentrations of boulders on the moraines, we determine a local production rate of 43.28 +/- 2.69 atoms gram(-1) year (at g(-1) yr(-1)). Reference Be-10 production rates (i.e., production rates by neutron spallation appropriate for sea-level, high-latitude sites) range from 3.97 +/- 0.09 to 3.78 +/- 0.09 at g(-1) yr(-1), determined using scaling after Lal (1991) and Stone (2000) and depending on our assumed boulder surface erosion rate. Since our boulder surface erosion rate estimate is a minimum value, these reference production rates are also minimum values. A secondary control site on the Huancane Mb moraines suggests that the Be-10 production rates are at least as low as, or possibly lower than, those derived from the Huancane Ha moraines. These sea-level, high-latitude production rates are at least 11-15% lower than values derived using the traditional global calibration dataset, and they are also lower than those derived from the late glacial Breque moraine in the Cordillera Blanca of Peru. However, our sea-level, high-latitude production rates agree well with recently published, locally calibrated production rates from the Arctic, New Zealand, and Patagonia. The production rates presented here should be used to ...
format Text
author Kelly, Meredith A.
Lowell, Thomas V.
Applegate, Patrick J.
Phillips, Fred M.
Schaefer, Joerg M.
Smith, Colby A.
Kim, Hanul
Leonard, Katherine C.
Hudson, Adam M.
spellingShingle Kelly, Meredith A.
Lowell, Thomas V.
Applegate, Patrick J.
Phillips, Fred M.
Schaefer, Joerg M.
Smith, Colby A.
Kim, Hanul
Leonard, Katherine C.
Hudson, Adam M.
A locally calibrated, late glacial Be-10 production rate from a low-latitude, high-altitude site in the Peruvian Andes
author_facet Kelly, Meredith A.
Lowell, Thomas V.
Applegate, Patrick J.
Phillips, Fred M.
Schaefer, Joerg M.
Smith, Colby A.
Kim, Hanul
Leonard, Katherine C.
Hudson, Adam M.
author_sort Kelly, Meredith A.
title A locally calibrated, late glacial Be-10 production rate from a low-latitude, high-altitude site in the Peruvian Andes
title_short A locally calibrated, late glacial Be-10 production rate from a low-latitude, high-altitude site in the Peruvian Andes
title_full A locally calibrated, late glacial Be-10 production rate from a low-latitude, high-altitude site in the Peruvian Andes
title_fullStr A locally calibrated, late glacial Be-10 production rate from a low-latitude, high-altitude site in the Peruvian Andes
title_full_unstemmed A locally calibrated, late glacial Be-10 production rate from a low-latitude, high-altitude site in the Peruvian Andes
title_sort locally calibrated, late glacial be-10 production rate from a low-latitude, high-altitude site in the peruvian andes
publisher Oxford, Elsevier Sci Ltd
publishDate 2015
url https://doi.org/10.1016/j.quageo.2013.10.007
http://infoscience.epfl.ch/record/212294
geographic Arctic
New Zealand
Patagonia
geographic_facet Arctic
New Zealand
Patagonia
genre Arctic
Ice cap
genre_facet Arctic
Ice cap
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container_title Quaternary Geochronology
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