சுற்றுச்சூழல் & பகுப்பாய்வு நச்சுயியல்

Middle-Late Pleistocene Paleo-Climate and Paleo-Altimetry of the Centre of Tibetan Plateau Indicated by the Sporopollen Record of Well QZ-4

Abstract

Jianglin He, Jian Wang, Weipeng Li and Wei Sun

The core sample from well QZ-4 is an important climate archive for the central Tibetan Plateau in the middle-late Pleistocene. In this work, a detailed pollen analysis of it is carried out to provide a preliminary insight into the paleoclimate and paleo-altimetry change in the central Tibetan Plateau. It can be concluded that the pollen assemblage can be obviously divided into two pollen zones, Pollen zone I (251.1-314 m in depth, 120.0-345.8 ka BP) and Pollen zone II (200-251.1 m in depth, 105.4-120 ka BP). The paleo-climate during pollen zone I deposition period was comparatively colder and wetter than it was during the pollen zone II deposition period. After Gonghe movement, the center of Tibetan Plateau was uplifted about 300 m (from 3500-3700 m to 3800-4000 m in elevation). The wind was changed from horizontal or downward direction to upward direction, in the study area. In the central of Tibetan Plateau, the climate change seems to be mainly driven by global climate change, and that tectonic uplift may have been a subordinate influence at the middle-late Pleistocene.