SHRIMP-RG U-Pb zircon geochronology of mesoproterozoic metamorphism and plutonism in the southwesternmost United States
Journal of Geology
By: Andrew P. Barth, Joseph L. Wooden, and Drew S. Coleman
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Abstract
Mesoproterozoic intrusive and granulite‐grade metamorphic rocks in southern California have been inferred to be exotic to North America on the basis of perceived chronologic incompatibility with autochthonous cratonal rocks. Ion microprobe geochronology indicates that zircons in granulite‐grade gneisses, dated at 1.4 Ga using conventional methods, are composed of 1.68–1.80‐Ga cores and 1.19‐Ga rims. These Early Proterozoic gneisses were metamorphosed at extremely high temperatures and moderate pressures during emplacement of the 1.19‐Ga San Gabriel anorthosite complex. The lack of a 1.4‐Ga metamorphic event suggests that Proterozoic rocks in this region, rather than being exotic to North America, may in fact be a midcrustal window into Mesoproterozoic crustal evolutionary processes in southwestern North America.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | SHRIMP-RG U-Pb zircon geochronology of mesoproterozoic metamorphism and plutonism in the southwesternmost United States |
| Series title | Journal of Geology |
| DOI | 10.1086/319975 |
| Volume | 109 |
| Issue | 3 |
| Year Published | 2001 |
| Language | English |
| Publisher | University of Chicago Press |
| Description | 9 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Geology |
| First page | 319 |
| Last page | 327 |
| Country | United States |
| State | California |
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