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Open-File Report 2013–1146

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Geochronologic and Geochemical Data from Mesozoic Rocks in the Black Mountain Area Northeast of Victorville, San Bernardino County, California

By Paul Stone, Andrew P. Barth, Joseph L. Wooden, Nicole K. Fohey-Breting, Jorge A. Vazquez , and Susan S. Priest

Thumbnail of and link to report PDF (5.1 MB)Abstract

We present geochronologic and geochemical data for Mesozoic rocks in the Black Mountain area northeast of Victorville, California, to supplement previous geologic mapping. These data, together with previously published results, limit the depositional age of the sedimentary Fairview Valley Formation to Early Jurassic, refine the ages and chemical compositions of selected units in the overlying Jurassic Sidewinder Volcanics and of related intrusive units, and limit the age of some post-Sidewinder faulting in the Black Mountain area to a brief interval in the Late Jurassic. The new information contributes to a more complete understanding of the Mesozoic magmatic and tectonic evolution of the western Mojave Desert and surrounding regions.

First posted July 19, 2013

For additional information:
Contact Information, Geology, Minerals, Energy, and Geophysics Science Center—Menlo Park
U.S. Geological Survey
345 Middlefield Road, MS-973
Menlo Park, CA 94025-3591
http://geomaps.wr.usgs.gov/gmeg/

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Suggested citation:

Stone, P., Barth, A.P., Wooden, J.L., Fohey-Breting, N.K., Vazquez, J.A., and Priest, S.S., 2013, Geochronologic and geochemical data from Mesozoic rocks in the Black Mountain area northeast of Victorville, San Bernardino County, California: U.S. Geological Survey Open-File Report 2013–1146, 31 p., http://pubs.usgs.gov/of/2013/1146/.


Contents

Abstract

Introduction

Geologic Framework

Samples for Geochronologic and Geochemical Analysis

Geochronologic Data

Geochemical Data

Paleozoic to Jurassic History

Summary

Acknowledgments

References Cited


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