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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Tripathy-lang, Alka Schmidt, Jennifer L. Fox, Matthew Zeitler, Peter K. Wielicki, Matthew M. Tremblay, Marissa M. Shuster, David L. Harrison, T. Mark |
| Description | Author Affiliation: Tremblay MM ( Department of Earth and Planetary Science, University of California, Berkeley, CA 94720); Fox M ( Department of Earth and Planetary Science, University of California, Berkeley, CA 94720); Schmidt JL ( Department of Earth and Environmental Sciences, Lehigh University, Bethlehem, PA 18015); Tripathy-Lang A ( Department of Earth and Planetary Science, University of California, Berkeley, CA 94720); Wielicki MM ( Department of Earth, Planetary and Space Sciences, University of California, Los Angeles, CA 90095.); Harrison TM ( Department of Earth, Planetary and Space Sciences, University of California, Los Angeles, CA 90095 mtremblay@berkeley.edu tmark.harrison@gmail.com.); Zeitler PK ( Department of Earth and Environmental Sciences, Lehigh University, Bethlehem, PA 18015); Shuster DL ( Department of Earth and Planetary Science, University of California, Berkeley, CA 94720); |
| Abstract | Exhumation of the southern Tibetan plateau margin reflects interplay between surface and lithospheric dynamics within the Himalaya-Tibet orogen. We report thermochronometric data from a 1.2-km elevation transect within granitoids of the eastern Lhasa terrane, southern Tibet, which indicate rapid exhumation exceeding 1 km/Ma from 17-16 to 12-11 Ma followed by very slow exhumation to the present. We hypothesize that these changes in exhumation occurred in response to changes in the loci and rate of rock uplift and the resulting southward shift of the main topographic and drainage divides from within the Lhasa terrane to their current positions within the Himalaya. At â ¼17 Ma, steep erosive drainage networks would have flowed across the Himalaya and greater amounts of moisture would have advected into the Lhasa terrane to drive large-scale erosional exhumation. As convergence thickened and widened the Himalaya, the orographic barrier to precipitation in southern Tibet terrane would have strengthened. Previously documented midcrustal duplexing around 10 Ma generated a zone of high rock uplift within the Himalaya. We use numerical simulations as a conceptual tool to highlight how a zone of high rock uplift could have defeated transverse drainage networks, resulting in substantial drainage reorganization. When combined with a strengthening orographic barrier to precipitation, this drainage reorganization would have driven the sharp reduction in exhumation rate we observe in southern Tibet. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 39 |
| Volume Number | 112 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2015-09-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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