Depositional Environment Changes during the Cenozoic in the Northeastern Margin of the Qinghai–Tibet Plateau

The uplift of the Tibetan Plateau (TP) during late Cenozoic is thought to be one crucial factors controlling Asian climate. However, complex interaction between tectonics and climate change remains unclear. carbon oxygen isotopes elementary geochemistry rocks from early Eocene Lulehe Formation Miocene Youshashan in northern margin Qaidam Basin, shows important variations Rb/Sr, MgO/CaO, Sr/Cu, V/Cr ratios, together with CMI CIA, which are interpreted as reflecting relevant regional environmental changes. Combining above mentioned parameters, we reconstructed evolution sedimentary environment Basin. roughly divided into four stages: (1) warm humid; (2) cold dry; (3) alternations dry (4) arid. At same time, there also minor short-term changes dry, wet, cold, each stage. Basin were mainly affected by global changes, Qinghai Tibet Plateau, long-lasting plate collision, but was no continuous drought due Plateau. From Miocene, became humid.