By Richard A. Young, Earle E. Spamer

This selection 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)

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Figure 2 shows the apatite fission-track ages deter­ 2000 I—•—I mined on samples collected along the Kaibab and Bright Angel Trails. The sample closest to the river from this second data set is also shown S 1500 on Figure 1. The rocks sampled for each data set include Phanerozoic and middle Proterozoic sedimentary rocks, and igneous and metamor­ (0 phic rocks of late Early Proterozoic age. ^ (-•-) I • I > 1000 500 The data collected at river level (Figure I) show a general trend of increasing age with distance downriver.

5 SE = standard error - :: no data Z = 4772 ± 340 for apatite Mea n track lengths not corrected for length bias (Laslett and others, 1982) Table 1. , Carlson and others, 1999). Time-temperature estimates are derived from age and A total of 44 new samples were collected to add to the AFT data set track-length data using the AFTsolve computer program of Ketcham presented by Naeser and others (1989), hut only 17 yielded sufficient and others (1999). apatite for dating (Table 1). The Tapeats Sandstone and sandstones in CHAPTER FIVE 39 Phantom-Grandview monocline/Bright Angel fault zone.

Sediments shed from the Mogollon highlands to the southwest may have buried Laramide structures in the east, keeping the eastern area at elevated temperatures. The fission-track data indicate two periods of uplift and cooling in the canyon: the first in the early Tertiary related to the Laramide orogeny and a second period beginning in the mid­ dle to late Tertiary. The AFT data from Grand Canyon are compared to data from the southern Rocky Mountains. Although profoundly different intensities of Laramide-aged deformation and compare the resulting thermal histories with those determined for took place on the Colorado Plateau (monoclines) and in the southern the Colorado Front Range (Kelley and Chapin, 1997).

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