Late Triassic paleogeography of the southern Cordillera: The problem of a source for voluminous volcanic detritus in the Chinle Formation of the Colorado Plateau region
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Abstract
The Upper Triassic Chinle Formation of the Colorado Plateau contains voluminous volcanic detritus evidently derived from a source to the south. Volcanic rocks exposed in southern Arizona and northern Sonora have been assumed to represent this source terrane, but U-Pb isotopic geochronology and regional stratigraphic correlations indicate that these volcanic rocks are distinctly younger than the Chinle, and thus not a source for the volcanic detritus in the Chinle. Igneous rocks of known or possible Late Triassic age in Nevada, California, or northeastern Mexico are possible sources, but a clearly defined source terrane for the volcanic detritus in the Chinle has not been identified. Tectonic removal of the source terrane by rifting or strike-slip offset, though not proven, is a possibility.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Late Triassic paleogeography of the southern Cordillera: The problem of a source for voluminous volcanic detritus in the Chinle Formation of the Colorado Plateau region |
| Series title | Geology |
| DOI | 10.1130/0091-7613(1986)14<567:LTPOTS>2.0.CO;2 |
| Volume | 14 |
| Issue | 7 |
| Year Published | 1986 |
| Language | English |
| Publisher | Geological Society of America |
| Description | 4 p. |
| First page | 567 |
| Last page | 570 |
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