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| Titel |
Large Spatial and Temporal Variations in Himalayan Denudation |
| VerfasserIn |
R. Thiede, T. Ehlers |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250062463
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| Zusammenfassung |
| Over the last 30 years numerous studies have been presenting thermochrononemeter data
collected across the Indian, Nepalese, and Bhutanese Himalaya. A compilation of these data
provide now sufficient sample coverage across the Himalaya to quantify spatial and temporal
variations in denudation along several broad segments of the orogen. We use these data to
evaluate recent controversies surrounding the tectonic and climate controls of the erosional
flux and to evaluate lateral variation in exhumation along strike of the Himalaya. More
specifically, recent studies of the Himalaya show that enhanced precipitation correlates with
regions of high denudation, leading to the suggestion of a long-term co-evolution
of climate and denudation. We integrate 1070 published bedrock mineral cooling
ages with a Monte-Carlo inverse-model to quantify the orogen-wide denudation
history. Results indicate large variations in denudation that can only partially be
explained by modern and paleo precipitation. Across >1000 km of the southern
Greater Himalaya (Lesser Himalayan Crystalline) denudation rates were highest
(~1.5-3 mm/yr) between ~10-2 Ma and lower (0.5-2.6 mm/yr) over the last 2 My. In
constrast to this, across the ~2500 km length of the northern Greater Himalaya (Higher
Himalayan Crystalline) denudation rates vary over lengthscales of ~300-1700 km.
Slower denudation ( |
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