Metamorphic facies indicated by vein minerals in basal beds of the Great Valley sequence, northern California
Journal of Research of the U.S. Geological Survey
By: Edgar H. Bailey and David L. Jones
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Abstract
A reexamination of reported blueschist mineral localities in the basal strata of the Great Valley sequence revealed only prehnite-pumpellyite facies minerals. Franciscan graywacke thrust below the Great Valley rocks contains lawsonite-quartz blueschist assemblages. At a common pressure of about 4 kb, the Franciscan blueschists formed at lower temperatures than the overlying Great Valley prehnite-bearing rocks, lending support to tectonic models that involve rapid subduction of the Franciscan rocks.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Metamorphic facies indicated by vein minerals in basal beds of the Great Valley sequence, northern California |
| Series title | Journal of Research of the U.S. Geological Survey |
| Volume | 1 |
| Issue | 4 |
| Year Published | 1973 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Description | 3 p. |
| First page | 383 |
| Last page | 385 |
| Country | United States of America |
| State | California |
| Other Geospatial | Great Valley Sequence |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |