Geochronology, 1, 1–16, 2019 https://doi.org/10.5194/gchron-1-1-2019 © Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License. Chlorine-36=beryllium-10 burial dating of alluvial fan sediments associated with the Mission Creek strand of the San Andreas Fault system, California, USA Greg Balco1, Kimberly Blisniuk2, and Alan Hidy3 1Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, CA 94550, USA 2Department of Geology, San Jose State University, San Jose, CA, USA 3Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory, Livermore, CA, USA Correspondence: Greg Balco (
[email protected]) Received: 23 April 2019 – Discussion started: 30 April 2019 Revised: 3 July 2019 – Accepted: 5 July 2019 – Published: 18 July 2019 Abstract. We apply cosmogenic-nuclide burial dating using with stratigraphic age constraints as well as independent es- the 36Cl-in-K-feldspar=10Be-in-quartz pair in fluvially trans- timates of long-term fault slip rates, and it highlights the po- ported granitoid clasts to determine the age of alluvial sedi- tential usefulness of the 36Cl=10Be pair for dating Upper and ment displaced by the Mission Creek strand of the San An- Middle Pleistocene clastic sediments. dreas Fault in southern California. Because the half-lives of 36Cl and 10Be are more different than those of the commonly used 26Al=10Be pair, 36Cl=10Be burial dating should be ap- 36 10 plicable to sediments in the range ca. 0.2–0.5 Ma, which is 1 Introduction: Cl= Be burial dating too young to be accurately dated with the 26Al=10Be pair, and should be more precise for Middle and Late Pleistocene sed- In this paper we apply the method of cosmogenic-nuclide 36 iments in general.