Microbial and Geochronologic Constraints on the Neogene Paleotopography of Northern Tibetan Plateau Academic Article uri icon

abstract

  • 2019. American Geophysical Union. All Rights Reserved. High topography is the manifestation of the balance between deep and surficial erosional processes. Hence, reconstructions of paleotopography are critical for disentangling records of orogenesis and climate. Here we used a new approach by combining detrital zircon U-Pb geochronology and tetraether-based paleothermometry to characterize the Neogene paleotopography of Northern Tibetan Plateau. Detrital zircon U-Pb data reveal that the Qilian Shan has been uplifted, providing sediments to bounding basins since circa 15.8Ma. The paleothermometry studies show warm temperatures for paleosols (<12.49.5Ma and 3.72.0Ma) and low temperatures for lacustrine facies (12.4Ma and 9.53.7Ma). We interpret the different temperatures to reflect the in situ production of tetraethers under warm temperatures within the basin (paleosols) versus terrestrial inputs from high and cold drainage to the paleolake (lacustrine facies). The study supports a topography with significant relief in the Northern Tibetan Plateau since 12.4Ma.

published proceedings

  • GEOPHYSICAL RESEARCH LETTERS

author list (cited authors)

  • Zhuang, G., Zhang, Y. G., Hourigan, J., Ritts, B., Hren, M., Hou, M., Wu, M., & Kim, B.

complete list of authors

  • Zhuang, Guangsheng||Zhang, Yi Ge||Hourigan, Jeremy||Ritts, Bradley||Hren, Michael||Hou, Mingqiu||Wu, Minghao||Kim, Bumsoo

publication date

  • January 1, 2019 11:11 AM