Quantifying Long-Term Variations in tectonic and Climate-Driven Exhumation: Northwest Himalaya, India
Zusammenfassung der Projektergebnisse
I achieved much of my research goals and reached several important, interesting, and provocative results. These studies quantifies the orogen wide temporal and spatial variability in Himalayan denudation. A key result from our analysis is that temporally and spatially punctuated periods of denudation are recognized across the Himalayan Front. We find that over spatial scales of ~700 km and temporal scales of 2-4 Myr that denudation rates are broadly consistent within the range of observed cooling ages. However, over larger spatial and temporal scales this continuity in rates is less robust and patterns of denudation are variable. Around the syntaxes of the Himalaya denudation rates increase sharply over a short distance compared to their neighboring areas. However, the magnitude of denudation near the syntaxes over the last 4 Ma is comparable to that seen in the central regions of the Himalayan Front. The spatial and temporal variability in denudation rates documented here highlight that no single mechanism (e.g. onset of the monsoon, or reactivation of thursts across the entire orogen) can explain the results presented here, but rather that the range front can be devide into several broad segments which evolve depending on their structuraltectonic, lithologic and erosional behavior. Future studies using dynamic models of the couplings between climate, erosion, and tectonics must reproduce the temporal and spatial scales of variability in denudation documented here if they are to provide a robust test of if and when climate and tectonic processes are coupled.
Projektbezogene Publikationen (Auswahl)
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(2007). Spatial and temporal variation of Himalayan Erosion. Eos Trans. AGU, 88(52), Fall Meet. Suppl., Abstract T23D-1645
Thiede, R.C.; Bookhagen, B.; Ehlers, T.; and Strecker, M. R.
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(2007). Spatial and temporal variation of Himalayan Erosion. Goldschmidt Conferenze Cologne: G09, Abstract A1016
Thiede, R.C.; Bookhagen, B.; Ehlers, T.; and Strecker, M. R.
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(2008). Internal versus external forcing of orogenic detachments. EGU General Assembly Vienna, Abstract 2008-A-04199
Hoth, S.; Thiede, R. C.; Kukowski, N.; Oncken, O.; Avouac, J-P.
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(2008). Spatiotemporal Evolution of Denudation across the Himalaya, EGU General Assembly Vienna, Abstract 2008-A-06501
Thiede, R. C.; Ehlers, T. A.
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(2009) Brittle-fault deformation history in the NW Himalaya (Himachal Pradesh, India) EGU General Assembly Vienna, Abstract 2009-12017
E. Hintersberger, K. Decker, R. Thiede, and M. Strecker
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(2009) Long-term erosion and exhumation rates across different climatic zones in the Indian NW-Himalaya. EGU General Assembly Vienna, Abstract 2009-13102
A. Deeken, J.K. Hourigan, R.T. Thiede, E.R. Sobel, and M.R. Strecker
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2009. Erosional Variability along the Northwest Himalaya: J. Geophys. Res-Earth Surface., 114, F01015
Thiede, R. C., Ehlers, T. A., Bookhagen, and Strecker, M. R.
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(2010). Structurally distinct domains in the Indian NW-Himalaya, constrained by AFT and ZHe thermochronology. EGU General Assembly Vienna, Abstract 2010- 14314
Deeken, A., J. K. Hourigan, R.T. Thiede, E.R. Sobel, and M.R. Strecker
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(2010). Syntectonic Extension and Dome Development during Formation of the NE-Chinese Pamir. EGU General Assembly Vienna, Abstract 2010-10067
Thiede, R.C., E.R. Sobel, L. Schoenbohm, C. Jie, and D. Stockli
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2010. E-W extension in the Northwestern Himalaya, NW India: GSA Bulletin v. 122; no. 9/10; p. 1499–1515
Hintersberger, E., Thiede, R. C., Strecker, M. R., and Hacker, B.