Radiocarbon, Volume 33, Number 3 (1991)
ABOUT THIS COLLECTION
Radiocarbon is the main international journal of record for research articles and date lists relevant to 14C and other radioisotopes and techniques used in archaeological, geophysical, oceanographic, and related dating.
This archive provides access to Radiocarbon Volumes 1-54 (1959-2012).
As of 2016, Radiocarbon is published by Cambridge University Press. The journal is published quarterly. Radiocarbon also publishes conference proceedings and monographs on topics related to fields of interest. Visit Cambridge Online for new Radiocarbon content and to submit manuscripts.
ISSN: 0033-8222
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Recent Submissions
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Radiocarbon, Volume 33, Number 3 (1991)Department of Geosciences, The University of Arizona, 1991-01-01
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Send for a Free Sample Copy of...Quaternary Science ReviewsDepartment of Geosciences, The University of Arizona, 1991-01-01
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Send for a Free Sample Copy of...Quaternary InternationalDepartment of Geosciences, The University of Arizona, 1991-01-01
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Radiocarbon Announces the Publication of the Following Special Issues:Department of Geosciences, The University of Arizona, 1991-01-01
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Radiocarbon – Price ListDepartment of Geosciences, The University of Arizona, 1991-01-01
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Notice to Readers and ContributorsDepartment of Geosciences, The University of Arizona, 1991-01-01
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Associate EditorsDepartment of Geosciences, The University of Arizona, 1991-01-01
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Shell Hash Dating and Mixing Models for Palimpsest Marine SedimentsThe dating of palimpsest marine sediments using broken shell fragments (shell hash) is considered to be a necessary but unreliable technique because of the mixed age of the fragments. An analysis of geological mixing models and radiocarbon data on shell hash from sandy sediments on the southeast Australian coast and shelf are used to examine the possibility for simulating the depositional processes, and thus, to better understand the age structure of the deposits.
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Radiocarbon UpdatesDepartment of Geosciences, The University of Arizona, 1991-01-01
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Radiocarbon in Seawater and Organisms from the Pacific Coast of Baja CaliforniaRadiocarbon was measured in dissolved inorganic carbon (DIC) and living organisms collected off the west coast of Baja California in October 1980. Samples from three locations were examined. Delta-14C of DIC at the southernmost station was higher than those further north, which reflects reduced upwelling in the southern region. Crabs and anchovies had Delta-14C values significantly lower than surface DIC Delta-14C, indicating the incorporation of ‘older', sediment-derived carbon sources from their diets. Comparisons are made between our DIC Delta-14C measurements and those obtained during other cruises and at a coastal site, from 1959 through 1987. Two distinct time histories of DIC Delta-14C are apparent for the post-bomb period: 1) a lower Delta-14C curve for sites close to the coast influenced by enhanced coastal upwelling; and 2) a higher Delta-14C curve for sites further offshore within the California Current.
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Lithium Contamination in AMS Measurements of 14CHigh count rates of lithium ions in an AMS measurement system for 14C were traced to the lithium content in the quartz tubes used in the graphitization of the samples. The lithium contamination was nearly eliminated by the use of borosilicate glass reaction tubes at a lower reaction temperature. The ion beam current and the measurement precision of the isotope ratio were not affected.
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Late Quaternary Pteropod Preservation in Eastern North Atlantic Sediments in Relation to Changing ClimateAMS 14C measurements on pteropod shells from eastern North Atlantic deep-sea cores reveal distinct periods of aragonite preservation during the last 16,000 years. Most preservation spikes coincide with documented periods of climatic change on a scale of 2 x 101 to 2 x 103 years.
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LaboratoriesDepartment of Geosciences, The University of Arizona, 1991-01-01