By Richard A. Young, Earle E. Spamer
This choice of papers at the geology of the Grand Canyon and the Colorado River is an outgrowth of casual conversations between Colorado Plateau geologists over a interval of a number of years.
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Extra info for Colorado River: Origin and Evolution; Proceedings of a Symposium Held at Grand Canyon National Park in June, 2000 (Monograph)
Rocks have been at temperatures of ~<200°C for the last 1000 Ma. Fission-track data on detrital apatite crystals separated from This second episode of uplift occurred after middle Eocene time, and Pennsylvanian and Permian strata at the rim near Grand Canyon brought the rocks up to a temperature zone during which no significant Village indicate that these rocks have never been buried to sufficiently annealing took place. The minimum cooling ages obtained in Marble high temperatures for the fission tracks to have been totally annealed.
The / / / / 98GC38 West of Hurricane Fault _ are also reflected in the higher elevation samples of the Tanner Trail - traverse. The high elevation samples are -75 to 80 Ma, compared to >100 Ma on the Bright Angel Trail traverse (Figure 2). Unfortunately, 80 60 40 Time (Ma) c) 20 the precise location of the base of the late Mesozoic PAZ is difficult to locate in Grand Canyon because the Redwall Limestone and the car bonates and shales of the Tonto Group do not contain apatite. Figure 3. l\\erma\ histories derived from (ijjf anA ua<:\i-\a\gCa data from the Phantom-Cramhiew monocline anil from west of flie Hurricane Fault using the model of Carlson and others (1999) and Keiclium and others (1999).
Moderate Acknowledgments Laramide uplift only served to cool these rocks over a period during The authors of this paper thank the National Park Service for permission which some annealing still was taking place. By contrast, abruptly dif to collect the samples used in this study We would also like to thank ferent cooling ages across the East Kaibab monocline and the Bright Shari A. A. G. Cunningham for their comments Angel and Hurricane Faults, suggest the moncline and the west sides on the manuscript.