Journal
JOURNAL OF MOUNTAIN SCIENCE
Volume 15, Issue 3, Pages 532-547Publisher
SCIENCE PRESS
DOI: 10.1007/s11629-017-4692-5
Keywords
Northern Qaidam Basin; Apatite Fission-Track; Tectonic evolution; Provenance analysis
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Funding
- Natural Science Foundation of China [41501209, 41571177]
- Fundamental Research Funds for the Central Universities [862457, lzujbky-2016-22]
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The Northern Qaidam Basin is located at the northeastern part of the Qinghai-Tibetan Plateau. It contains very thick Cenozoic terrestrial clastic sediments, which records the formation of the northern Qaidam Basin due to compressional deformation during the Indo-Asian collision. In this paper, we used detrital apatite fission-track thermochronology, including 4 sandstones and 2 conglomerates samples from the Lulehe section, to reveal the Cenozoic evolution of the northern Qaidam Basin. Fission-track dating indicated the source region of the Lulehe section has experienced important cooling and uplifting in the Late Cretaceous (at similar to 85.1 Ma and similar to 65 Ma) and the Eocene (similar to 52 Ma), respectively. The AFT age distribution on the section suggested that the provenance of Lulehe section sediments were mainly derived from the south Qilian Shan (Qilian Mountains) and Altun Shan (Altun Mountains), and two significantly provenance changes may occur at 43.4-46.1 Ma and similar to 37.8 Ma, respectively. The results may have strong constrains on the Cenozoic deformation and tectonic evolution of the northern Qaidam Basin and Qinghai-Tibet Plateau.
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