The Cedars ultramafic mass, Sonoma County, California
Open-File Report
2012-1164
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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 |