Collision between the Indian and Eurasian plates produced concomitant uplift of the Tibetan Plateau and its basin-ridge geomorphological systems. Surface relief of the Tibetan Plateau has significant dynamic and thermal effects on atmospheric circulation and on regional and global climate. It has been considered as one of the key drivers for the formation of the Asian monsoon, enhanced erosion and weathering, global decreased CO2 during the Cenozoic. Finally, this uplift caused global cooling in the Cenozoic. However, at present, the driving mechanisms of these processes still remain controversies and have not been clearly confirmed by records of chemical weathering from the Tibetan Plateau. This dataset includes major elemental compositions of the Fenghuoshan Group (thick of ~4500 m) from the Hoh Xil Basin which has been dated back to the Late Cretaceous-Eocence. Element was measured in the Institute of Geology and Geophysics, Chinese Academy of Sciences using XRF-1500. The resconstructed Paleogene chemical weathering sequences allow us to constrain the trends of chemical weathering history of the studied area. We found that intensity of chemical weathering is well correlated with global temperature change. These results provide further data supprot for discussing the dynamic mechanisms and links among the Paleogene chemical weathering in the Hoh Xil Basin, uplift of the Tibetan Plateau, and global change.
Southern Xizang represents a most important part of the Neo-Tethys. Neo-Tethyan deposits in this region can be divided into two types in general: a deep water oceanic represented by the Yarlung Zangbo suture zone and the other shallow marine one in the south of the suture. The main history of the Neo-Tethys is seen in the Triassic to Paleogene sequence, which destines the work of building a complete sedimentary sequence of the Neo-Tethys a basic goal of this scientific expedition. This dataset packages all the fossiliferous profiles that have been explored in the field by the Mesozoic and Cenozoic expedition group of the Nanjing Institute of Geology and Palaeontology of the Chinese Academy of Sciences on the Yarlung Zangbo suture zone and Tethys Himalayan Triassic to Paleogene in southern Xizang. There are 12 column profiles, compiled in an order of age from old to young.
LI Jianguo, LI Xianghui, LUO Hui, WANG Bo, LI Xin
The Qaidam Basin is located in the northern margin of Qinghai Tibet Plateau. It is one of the most representative sedimentary basins in Qinghai Tibet Plateau. Tertiary red sandstones, Jurassic coal stara and Cretaceous conglomerates are developed in the basin, The paleoclimate, paleogeography and paleotectonic information recorded in the study are of great significance to the study of the uplift and evolution of the Qinghai Tibet Plateau. The field stratigraphic investigation of Qaidam Basin is not only beneficial to the reconstruction of paleoclimate, paleogeography and paleostructure of Mesozoic terrestrial system, but also to the exploration, development and utilization of coal, oil and gas resources in Qinghai Tibet region. It is also beneficial to the scientific investigation of Qinghai Tibet region and is expected to contribute to the major national development strategy Make a contribution. This field exploration and sampling were finished in multiple sections in the Qaidam Basin, and details of the Mesozoic and Cenozoic strata in these sections and field photos were provided. All data are from our field measurements.