The Cedars ultramafic mass, Sonoma County, California
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Abstract
The Cedars ultramafic mass is a mantle fragment that consists of partially serpentinized spinel harzburgite and dunite. Compositional layering and a chromite lineation define a penetrative metamorphic foliation that almost certainly formed in the upper mantle. Although detailed petrofabric and mineral chemistry are presently lacking, it seems reasonable that the Cedars peridotite represents a slice of mantle tectonite that once formed the base of the Coast Range ophiolite, and not an abyssal peridotite tectonically emplaced within the Franciscan accretionary prism.
Publication type | Report |
---|---|
Publication Subtype | USGS Numbered Series |
Title | The Cedars ultramafic mass, Sonoma County, California |
Series title | Open-File Report |
Series number | 2012-1164 |
DOI | 10.3133/ofr20121164 |
Edition | Version 1.2 |
Year Published | 2012 |
Language | English |
Publisher | U.S. Geological Survey |
Publisher location | Reston, VA |
Contributing office(s) | Geology, Minerals, Energy, and Geophysics Science Center |
Description | iii, 13 p.; maps col.; Plate: 1 Sheet: 15 x 15 inches |
First page | i |
Last page | 13 |
Country | United States |
State | California |
County | Sonoma County |
Online Only (Y/N) | Y |
Additional Online Files (Y/N) | Y |
Google Analytic Metrics | Metrics page |