By Richard A. Young
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Additional resources for Colorado River Origin and Evolution
Example text
This fis sion-track age is based on a limited number of grains from one location Pine Hollow Formation and is considered (by the authors) only as an approximate age for the The Pine Hollow Formation (Bowers, 1972) crops out along the Table upper Pine Hollow Formation. Chff Plateau (Figure I) and consists of approximately 80 m of gray Paleocurrent data within the Pine Hollow Formation indicate complex purple, and red mudstone; bentonitic mudstone; siltstone; and minor limestone. Where it unconformably overlies the Canaan Peak or Grand and tectonically controlled flow directions (Goldstrand, 1991,1994).
1) Palisade Fault (strand of the Butte Fault), (2) Bright Angel Fault, and (3) Hunicane Fault. Arrows indicate sense of last movement on faults. Apatite from 26 samples from Grand Canyon was dated by the fissiontrack method. The analytical data for these apatites are in Tables 1 and 2. Fission-track lengths were not measured in the apatite samples reported in Table 1. Table 3 shows the distance downriver for the apatite samples and either the formation name or rock type collected. 2500 Figure 1 shows the fission-track ages of apatite separated from rocks collected at or near the river from Lees Ferry to Diamond Creek, a river distance of 364 km.
The dark shaded areas show the (heniuil histories that best fit the data and light shaded areas bound those histories that provide an accept able fit. The 55 and 65°C lines are shown for reference. Three samples across the Muav Fault on the southwest side of the Crazy Jug monocline yield similar ages and mean track lengths on either side of the structure at Shinumo Canyon. These few data do not indicate a significant difference in Laramide or posl-Laramide thermal history here. the Bright Angel Shale generally do not contain apatite.