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GEOREF RECORD

Quaternary rate of folding of the Ventura Avenue Anticline, western Transverse Ranges, Southern California

T. K. Rockwell, E. A. Keller and G. R. Dembroff
Quaternary rate of folding of the Ventura Avenue Anticline, western Transverse Ranges, Southern California
Geological Society of America Bulletin (June 1988) 100 (6): 850-858

Abstract

Upper Quaternary terraces of the Ventura River, California, are uplifted, tilted, and folded over the Ventura Avenue anticline. Rates of uplift and tilting have decreased since inception of the structure over the past 200 ka. Assuming that the chronology, based on amino-acid racemization, (super 14) C dates, and soils correlation, is approximately correct, then the minimum possible average rate of uplift in the axial region of the fold has decreased from approximately 14 mm/yr to 2 mm/yr during the past 200 ka. Interval rates of uplift for the periods 200 ka to 80 or 105 ka, 80 or 105 ka to 30 ka, and 30 ka to present are, respectively, about 20 mm/yr, 9 mm/yr, and 5 mm/yr. The rate of tilting shows a similar trend, decreasing from approximately 5.8 urad/yr, 2.5 urad/yr, and 1.2 urad/yr for the same time intervals, respectively. Based on the mechanics of flexural slip folds in stratified sedimentary rocks, these data suggest that the rootless Ventura Avenue anticline is a fold that has been shortening at a relatively constant rate of about 9 mm/yr since its inception.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 100
Serial Issue: 6
Title: Quaternary rate of folding of the Ventura Avenue Anticline, western Transverse Ranges, Southern California
Affiliation: San Diego State Univ., Dep. Geol. Sci., San Diego, CA, United States
Pages: 850-858
Published: 198806
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 21
Accession Number: 1988-041859
Categories: Quaternary geologyStructural geologyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, sketch maps
N34°15'00" - N34°30'00", W119°19'60" - W118°55'00"
Secondary Affiliation: Univ. Calif., USA, United StatesU. S. Geol. Surv., USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 1988
Program Name: USGSOPNon-USGS publications with USGS authors
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