Comparison of granitic intrusions in the Pelona and Orocopia Schists, southern California
Links
- Document: Report (17.16 MB pdf)
- Download citation as: RIS | Dublin Core
Abstract
Dating of some small plutons in the San Gabriel and Chocolate Mountains, southern California, yields Miocene K-Ar ages. A single granodiorite pluton that has been segmented by branches of the San Jacinto fault intrudes the Pelona Schist and yields ages of 14.0 to 18.6 million years. Several quartz monzonite plutons in the Chocolate Mountains, 235 kilometers to the southeast and on the opposite side of the San Andreas fault, yield ages ranging from 20.0 to 23.4 m.y. At least one pluton in the Chocolate Mountains intrudes the Orocopia Schist, a probable equivalent of the Pelona Schist. Chemical, modal, textural, mineralogical, and apparent K-Ar age differences suggest that the two groups of plutons are not offset parts of a single body, but the differences do not preclude the two groups from being related in a general way.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Comparison of granitic intrusions in the Pelona and Orocopia Schists, southern California |
| Series title | Journal of Research of the U.S. Geological Survey |
| Volume | 5 |
| Issue | 5 |
| Year Published | 1977 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Description | 7 p. |
| First page | 643 |
| Last page | 649 |
| Country | United States |
| State | California |
| Other Geospatial | Chocolate Mountains, San Gabriel Mountains |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |