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GEOREF RECORD

Evidence for post-early Miocene initiation of movement on the Garlock Fault from offset of the Cudahy Camp Formation, east-central California

F. C. Monastero, A. E. Sabin and J. D. Walker
Evidence for post-early Miocene initiation of movement on the Garlock Fault from offset of the Cudahy Camp Formation, east-central California
Geology (Boulder) (March 1997) 25 (3): 247-250

Abstract

The Cudahy Camp Formation, located in the El Paso basin, east-central California, consists of a 350-m-thick volcanic and sedimentary sequence of early Miocene age. Previous investigators determined from paleocurrent indicators that the source for these rocks was to the south and southeast, but failed to suggest a specific location for that source. Restoration of 64 km of left slip on the Garlock fault places Cudahy Camp rocks north and northwest of the early Miocene Eagle Crags volcanic field. The unique geochemical nature of basalts found in both locations, coincident ages of volcanic rocks, identical clast content of volcanic tuffs, and identical stratigraphic sequence indicate that the source for the Cudahy Camp Formation was the Eagle Crags volcanic field. This is the first documented occurrence of Miocene rocks offset by the Garlock fault. Because the Cudahy Camp rocks and their sources appear to be offset by the full displacement on the Garlock fault, we conclude that movement on the Garlock started after earliest middle Miocene time. Further constraining initiation of movement on the Garlock fault adds significantly to fully understanding the evolution of the western North American plate boundary in the middle to late Cenozoic.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 25
Serial Issue: 3
Title: Evidence for post-early Miocene initiation of movement on the Garlock Fault from offset of the Cudahy Camp Formation, east-central California
Affiliation: Naval Air Weapons Station, Geothermal Program Office, China Lake, CA, United States
Pages: 247-250
Published: 199703
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 17
Accession Number: 1997-030369
Categories: Structural geologyStratigraphyGeochronology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., 1 table, sketch map
N35°25'00" - N35°25'00", W117°45'00" - W117°45'00"
Secondary Affiliation: University of Kansas, Lawrence, KS, 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: 199710
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