Cienega Gap area, Pima Co., Arizona, USA
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| Location is approximate, estimate based on other nearby localities. | |
|---|---|
| Latitude & Longitude: | 32° North , 111° West (est.) |
| Margin of Error: | ~148km |
| Other regions containing this locality: | Sonoran Desert, North America |
A road cut along the eastbound lanes of I-10, four miles east of interchange for southbound Arizona Hwy 83 (at mile 281), exposes the “Turkey Track” porphyry (mileages used here due to standards for highway systems in USA). The porphyry is gray to brown and andesitic, and is interbedded with light-colored alluvial and lacustrine strata of the Pantano formation. Sedimentary strata below the flow are baked, but beds resting atop the flow are unaltered, indicating the porphyry here represents a flow rather than an intrusive, and the top of the flow may represent an erosion surface. Data from nearby localities suggest an age between 36 and 28 million years for the flow.
Mineral List
2 valid minerals.
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References
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‡Ref.: Cooper, J.R. (1961), Turkey-track porphyry - A possible guide for correlation of Miocene rocks in southeastern Arizona, Arizona Geological Society Digest: 4: 17-35.
Mielke, J.E. (1965), Trace element investigation of the “Turkey Track” porphyry, southeastern Arizona: MS thesis, Univ. Arizona.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 329-330.
Cienega Gap area, Pima Co., Arizona, USA