Correlation of Himalayan exhumation rates and Asian monsoon intensity
Abstract
Although most data suggest that the India-Eurasia continental collision began ~45-55Myr ago, the architecture of the Himalayan-Tibetan orogen is dominated by deformational structures developed in the Neogene period (<23Myr ago). The stratigraphic record and thermochronometric data indicate that erosion of the Himalaya intensified as this constructional phase began and reached a peak around 15Myr ago. It remained high until ~10.5Myrago and subsequently slowed gradually to ~3.5Myrago, but then began to increase once again in the Late Pliocene and Pleistocene epochs. Here we present weathering records from the South China Sea, Bay of Bengal and Arabian Sea that permit Asian monsoon climate to be reconstructed back to the earliest Neogene. These indicate a correlation between the rate of Himalayan exhumation-as inferred from published thermochronometric data-and monsoon intensity over the past 23Myr. We interpret this correlation as indicating dynamic coupling between Neogene climate and both erosion and deformation in the Himalaya.
- Publication:
-
Nature Geoscience
- Pub Date:
- December 2008
- DOI:
- 10.1038/ngeo351
- Bibcode:
- 2008NatGe...1..875C