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.
Suggested Citation
Harding, J.P., Gehrels, G.E., Harwood, D.S., Girty, G.H., 2000, Detrital zircon geochronology of the Shoo Fly Complex, northern Sierra terrane, northeastern California, chap. of Paleozoic and Triassic paleogeography and tectonics of western Nevada and northern California: Special Papers of the Geological Society of America, v. 347, p. 43-55, https://doi.org/10.1130/0-8137-2347-7.43.
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 |