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GEOREF RECORD

Single- and multigrain luminescence dating of sediments related to the Greenville Fault, eastern San Francisco Bay area, California

Glenn W. Berger, Thomas L. Sawyer and Jeffery R. Unruh
Single- and multigrain luminescence dating of sediments related to the Greenville Fault, eastern San Francisco Bay area, California
Bulletin of the Seismological Society of America (June 2010) 100 (3): 1051-1072

Abstract

Near urban areas and extending approximately 60 km along the eastern margin of the Livermore Valley, the Greenville fault is the easternmost right-lateral strike-slip fault of the San Andreas system in the greater San Francisco Bay area. Notwithstanding the 1980 Livermore earthquake sequence (mainshock M (sub L) 5.9) on the Greenville fault, there is no record of recency or of Holocene rates of activity on the Greenville fault, yet this fault exhibits clear geomorphic evidence of late Quaternary faulting. In trenches parallel and normal to the fault through alluvial fan deposits at the Laughlin Road site only pedogenic carbonate was available for Formula dating. Therefore, we applied several photon-stimulated luminescence (PSL) sediment-dating procedures to the silt and sand fractions of six samples. The polymineral-fine-silt multi-aliquot age estimates are generally inaccurate, but the single-grain quartz (SGQ) and multigrain quartz single-aliquot regenerative-dose (SAR) ages from sand grains are in stratigraphic sequence. In trench 3A these SAR ages range from 125+ or -11 yrs (before 2007) within the topmost unit L to 13.45+ or -0.79 ka in the base of the lowermost channel-fill unit G. The SAR PSL results demonstrate the importance of the use of SGQ dating for such sediments and provide the first numerical ages used to constrain the slip rate on the Greenville fault. Trench exposures reveal that unit G is an alluvial sequence infilling a paleochannel offset in a right-lateral sense along the northern Greenville fault. Age estimates from upper and middle unit G bracket deposition of subunit Gb are between 11.12+ or -0.55 ka and 10.64+ or -0.85 ka and those from middle and lower unit G bracket deposition of subunit Go are between 11.12+ or -0.55 ka and 13.45+ or -0.79 ka. These SAR PSL age estimates and measurements of the lateral offset constrain a preliminary slip-rate estimate to about 2 mm/yr or higher for the northern Greenville fault zone.


ISSN: 0037-1106
EISSN: 1943-3573
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 100
Serial Issue: 3
Title: Single- and multigrain luminescence dating of sediments related to the Greenville Fault, eastern San Francisco Bay area, California
Affiliation: Desert Research Institute, Reno, NV, United States
Pages: 1051-1072
Published: 201006
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 80
Accession Number: 2010-059073
Categories: GeochronologyQuaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables, geol. sketch maps
N36°52'60" - N38°55'60", W123°34'00" - W120°55'00"
Secondary Affiliation: Piedmont Geosciences, USA, United StatesWilliam Lettis & Associates, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201032
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