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.
Suggested Citation
Blake, M.C., Bailey, E., Wentworth, C.M., 2012, The Cedars ultramafic mass, Sonoma County, California (Version 1.2): U.S. Geological Survey Open-File Report 2012-1164, iii, 13 p.; maps col.; Plate: 1 Sheet: 15 x 15 inches, https://doi.org/10.3133/ofr20121164.
ISSN: 2331-1258 (online)
| 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 |