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Apatite 4He/3He and (U-Th)/He evidence for an ancient Grand Canyon.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Flowers, Rebecca Marie Farley, Kenneth A. |
| Copyright Year | 2012 |
| Abstract | The Grand Canyon is one of the most dramatic features on Earth, yet when and why it was carved have been controversial topics for more than 150 years. Here, we present apatite (4)He/(3)He thermochronometry data from the Grand Canyon basement that tightly constrain the near-surface cooling history associated with canyon incision. (4)He/(3)He spectra for eastern Grand Canyon apatites of differing He date, radiation damage, and U-Th zonation yield a self-consistent cooling history that substantially validates the He diffusion kinetic model applied here. Similar data for the western Grand Canyon provide evidence that it was excavated to within a few hundred meters of modern depths by ~70 million years ago (Ma), in contrast to the conventional model in which the entire canyon was carved since 5 to 6 Ma. |
| File Format | PDF HTM / HTML |
| PubMed reference number | 23196906 |
| Journal | Medline |
| Volume Number | 338 |
| Issue Number | 6114 |
| Alternate Webpage(s) | http://geomorphology.sese.asu.edu/Papers/FLowers-Farley-2012-Science.pdf |
| Alternate Webpage(s) | http://c.ymcdn.com/sites/www.aegweb.org/resource/resmgr/Additional_Resources/atw_gcage_evidence.pdf |
| Alternate Webpage(s) | https://doi.org/10.1126/science.1229390 |
| Journal | Science |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
