Abstract：The provenance of loess is of great significance to reveal the climate change and the uplift history of the Qinghai-Tibet Plateau in the Quaternary. In this paper,the main mineral compositions of the loess/paleosol sediments since 1.4 Ma in Lanzhou region,located in the western part of the Chinese Loess Plateau,are analyzed based on X-ray diffraction. Focusing on carbonate mineral content,this paper traces the main immediate provenance region of the loess/paleosol sediments in Lanzhou. The results indicate that: (1)the Qaidam Desert and the Alxa arid area have been the main immediate provenance region of the loess/paleosol sediments in Lanzhou since 1.4 Ma. (2)The relative contribution of potential provenance to dolomite and total carbonate minerals based on the binary mixed model and the feldspar/quartz ratio of the Lanzhou loess/paleosol sediments support that their provenance has changed frequently since 1.4 Ma. The northeastern Tibetan Plateau orogenic belt(Kunlun and Qilian Mountains)and Central Asian Orogenic Belt contributed equally to the loess in Lanzhou in 1.4~1.1 Ma and 0.9~0.3 Ma,while the contribution of the Central Asian Orogenic Belt to the loess in Lanzhou increased in 1.1~0.9 Ma and after 0.3 Ma,which may be a response to the Mid-Pleistocene transition and the enhancement of dry and cold climate in the Tibetan Plateau and its adjacent areas since 0.3 Ma. The high content of dolomite and total carbonate minerals in loess/paleosol sediments of Lanzhou at 1.15 Ma and 0.8 Ma and the rapid increase of feldspar/quartz ratio at 0.8 Ma may be a response to the Kunlun-Huanghe Movement,thus resulting in the increase of the contribution of the Kunlun and Qilian Mountains to the sediments of the Chinese Loess Plateau.
Cai Qing-Song,Yang Guang-Liang,Fan Yu-Xin et al. Provenance evolution of Quaternary loess/paleosol sequence in Lanzhou, China: evidence from carbonate minerals[J]. JOPC, 2022, 24(3): 583-598.
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