globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2065
论文题名:
Formation of the Grand Canyon 5 to 6 million years ago through integration of older palaeocanyons
作者: Karlstrom K.E.; Lee J.P.; Kelley S.A.; Crow R.S.; Crossey L.J.; Young R.A.; Lazear G.; Beard L.S.; Ricketts J.W.; Fox M.; Shuster D.L.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期:3
起始页码: 239
结束页码: 244
语种: 英语
Scopus关键词: apatite ; canyon ; fission track dating ; hurricane ; river system ; sampling ; temperature effect ; Arizona ; Grand Canyon ; United States
英文摘要: The timing of formation of the Grand Canyon, USA, is vigorously debated. In one view, most of the canyon was carved by the Colorado River relatively recently, in the past 5-6 million years. Alternatively, the Grand Canyon could have been cut by precursor rivers in the same location and to within about 200 m of its modern depth as early as 70-55 million years ago. Here we investigate the time of formation of four out of five segments of the Grand Canyon, using apatite fission-track dating, track-length measurements and apatite helium dating: if any segment is young, the old canyon hypothesis is falsified. We reconstruct the thermal histories of samples taken from the modern canyon base and the adjacent canyon rim 1,500 m above, to constrain when the rocks cooled as a result of canyon incision. We find that two of the three middle segments, the Hurricane segment and the Eastern Grand Canyon, formed between 70 and 50 million years ago and between 25 and 15 million years ago, respectively. However, the two end segments, the Marble Canyon and the Westernmost Grand Canyon, are both young and were carved in the past 5-6 million years. Thus, although parts of the canyon are old, we conclude that the integration of the Colorado River through older palaeocanyons carved the Grand Canyon, beginning 5-6 million years ago. © 2014 Macmillan Publishers Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106596
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: University of New Mexico, Albuquerque, NM, United States; US Geological Survey, Flagstaff, AZ 86001, United States; New Mexico Bureau of Geology and Mineral Resources, Socorro, NM 87810, United States; SUNY, Geneseo, Geneseo, NY 14454, United States; 20508 Brimestone Rd., Cedaredge, CO, United States; Department Earth and Planetary Science, University of California, Berkeley, CA 94720-4767, United States; Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, CA 94709, United States

Recommended Citation:
Karlstrom K.E.,Lee J.P.,Kelley S.A.,et al. Formation of the Grand Canyon 5 to 6 million years ago through integration of older palaeocanyons[J]. Nature Geoscience,2014-01-01,7(3)
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