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Use of cosmogenic radionuclides as a sediment tracer in the Santa Cruz littoral cell, California, United States

L. A. Perg, R. S. Anderson and R. C. Finkel
Use of cosmogenic radionuclides as a sediment tracer in the Santa Cruz littoral cell, California, United States
Geology (Boulder) (April 2003) 31 (4): 299-302

Abstract

We demonstrate that cosmogenic radionuclides can be employed to trace sediment when the sources have sufficiently distinct concentrations, and develop a theoretical mixing model for a rocky coastline littoral system. We combine the resulting mixing model with existing cosmogenic radionuclide methods that quantify river inputs and terrace ages to determine the major components of the long-term littoral sediment budget of the Santa Cruz, California, coastline. Sediment derived from coastal basins eroding at 0.2 mm/yr has a much lower concentration than sediment derived from 60-84 ka terrace sands atop backwearing seacliffs. The complex pattern of cosmogenic radionuclide concentrations in littoral sands along >100 km of coastline can be explained by mixing sediment derived from seacliffs backwearing at 10 cm/yr with that delivered by rivers having widely different amounts of sediment discharge.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 31
Serial Issue: 4
Title: Use of cosmogenic radionuclides as a sediment tracer in the Santa Cruz littoral cell, California, United States
Affiliation: University of California at Santa Cruz, Department of Earth Sciences, Santa Cruz, CA, United States
Pages: 299-302
Published: 200304
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 12
Accession Number: 2003-032320
Categories: Isotope geochemistryOceanography
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2003037
Illustration Description: illus. incl. 1 table, sketch map
N36°51'00" - N37°16'00", W122°17'60" - W121°35'60"
Secondary Affiliation: Lawrence Livermore National Laboratory, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200311
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