The Pondosa fault zone: A distributed dextral-normal-oblique fault system in northeastern California, USA

Jessica Ann Thompson Jobe; Richard W. Briggs; Ryan D. Gold; Stephen B. DeLong; Madeline Hille; Jaime Delano; Samuel Johnstone; Alexandra Pickering; Rachel Phillips; Andrew T. Calvert

doi:10.1130/GES02450.1

The Pondosa fault zone: A distributed dextral-normal-oblique fault system in northeastern California, USA

Geosphere

By: Jessica Ann Thompson Jobe, Richard W. Briggs, Ryan D. Gold, Stephen B. DeLong, Madeline Hille, Jaime Delano, Samuel Johnstone, Alexandra Pickering, Rachel Phillips, and Andrew T. Calvert

https://doi.org/10.1130/GES02450.1

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Abstract

The tectonic domains of Basin and Range extension, Cascadia subduction zone contraction, and Walker Lane dextral transtension converge in the Mushroom Rock region of northeastern California, USA. We combined analysis of high-resolution topographic data, bedrock mapping, ⁴⁰Ar/³⁹Ar geochronology, low-temperature thermochronology, and existing geologic and fault mapping to characterize an extensive dextral-normal-oblique fault system called the Pondosa fault zone. This fault zone extends north-northwest from the Pit River east of Soldier Mountain, California, into moderately high-relief volcanic topography as far north as the Bartle (California) townsite with normal and dextral offset apparent in geomorphology and fault exposures. New and existing ⁴⁰Ar/³⁹Ar and radiocarbon dating of offset lava flows provides ages of 12.4 ka to 9.6 Ma for late Cenozoic stratigraphic units. Scarp morphology and geomorphic expression indicate that the fault system was active in the late Pleistocene. The Pondosa fault zone may represent a dextral-oblique accommodation zone between north-south–oriented Basin and Range extensional fault systems and/or part of the Sierra Nevada–Oregon Coast block microplate boundary.

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Additional publication details
Publication type	Article
Publication Subtype	Journal Article
Title	The Pondosa fault zone: A distributed dextral-normal-oblique fault system in northeastern California, USA
Series title	Geosphere
DOI	10.1130/GES02450.1
Volume	19
Issue	1
Publication Date	December 07, 2022
Year Published	2022
Language	English
Publisher	Geological Society of America
Contributing office(s)	Geologic Hazards Science Center - Seismology / Geomagnetism
Description	27 p.
First page	179
Last page	205
Country	United States
State	California
Other Geospatial	eastern California