Detrital zircon geochronology of the Shoo Fly Complex, northern Sierra terrane, northeastern California
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Abstract
U-Pb analyses have been conducted on 92 individual detrital zircon grains from 4 of the main thrust sheets of the Shoo Fly Complex. Samples from the Culbertson Lake allochthon, Duncan Peak allochthon, and Lang sequence yield mainly 1.80-2.10, 2.20-2.45, and 2.55-2.70 Ga ages, which suggests that sediments in these units originated in a cratonal region containing Paleoproterozoic and Archean igneous rocks. These ages match those of basement provinces from the northwestern Canadian shield, suggesting a provenance link with northwestern North America during early Paleozoic time. The Sierra City melange, however, has significantly different zircon ages of 551-635 and 1170-1319 Ma, with only a subordinate population of >1.8 Ga grains. These grains apparently were derived originally from an outboard Neoproterozoic-Cambrian(?) volcanic arc and from 1.0-1.7 Ga basement rocks of south-western North America. The occurrence of all three sets of ages in a sandstone that accumulated outboard of the Lang, Culbertson Lake, and Duncan Peak thrust sheets indicates that most rocks of the Shoo Fly Complex formed inboard of a volcanic arc located in proximity to the southern portion of the Cordilleran margin.
Study Area
| Publication type | Book chapter |
|---|---|
| Publication Subtype | Book Chapter |
| Title | Detrital zircon geochronology of the Shoo Fly Complex, northern Sierra terrane, northeastern California |
| Series title | Special Papers of the Geological Society of America |
| DOI | 10.1130/0-8137-2347-7.43 |
| Volume | 347 |
| Year Published | 2000 |
| Language | English |
| Publisher | American Geosciences Institute |
| Description | 13 p. |
| Larger Work Type | Book |
| Larger Work Subtype | Monograph |
| Larger Work Title | Paleozoic and Triassic paleogeography and tectonics of western Nevada and northern California |
| First page | 43 |
| Last page | 55 |
| Country | United States |
| State | California |
| Other Geospatial | Shoo Fly Complex |
| Google Analytic Metrics | Metrics page |