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

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Journal of Geoscience and Environment Protection 2017年第8期5卷 148-165页

作者： Jianglin He Jian Wang Weipeng Li Wei Sun Chengdu Institute of Geology and Mineral Resources Ministry of Land and Resources Chengdu China Key Laboratory for Sedimentary Basin and Oil and Gas Resources Ministry of Land Resources Chengdu China Land and Resources College China West Normal University Nanchong China Key Laboratory of Mountain Environment Evolution and regulation Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu China

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 paleo-climate 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 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.

关键词： Tibet Plateau Mid-Pleistocene Palaeo-climate paleo-altimetry Gonghe Movement Well QZ-4

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A mammalian fossil from the Dingqing Formation in the Lunpola Basin,northern Tibet,and its relevance to age and paleo-altimetry

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Science Bulletin 2012年第Z1期 263-271页

作者： DENG Tao1*,WANG ShiQi1,XIE GuangPu2,LI Qiang1,HOU SuKuan1 & SUN BoYang1,3 1 Key Laboratory of Evolutionary Systematics of Vertebrates,Institute of Vertebrate paleontology and paleoanthropology,Chinese Academy of Sciences,Beijing 100044,China 2 Gansu Provincial Museum,Lanzhou 730050,China 3 Graduate University of the Chinese Academy of Sciences,Beijing 100049,China

The distal extremity of a rhinocerotid humerus from the upper part of the Dingqing Formation at the Lunbori locality in Baingoin County,northern Tibet,is the first mammalian fossil found in Cenozoic deposits of the Lunpola *** medial condyle of the distal trochlea of the humerus specimen from Lunbori gradually contracts from medially to *** margin of the medial surface of the medial condyle is not prominent,the well-developed medial epicondyle strongly extends posteriorly,and is divided from the articular facet of the medial condyle by a groove;all of which are characteristic for the *** medial condyle is wide at the bottom and narrow at the *** medial collateral ligament fossa is relatively shallow,and the medial collateral ligament tubercle is very *** medial part of the upper margin of the medial condyle smoothly connects to the bony surface above,but there is no clear boundary between *** of these characteristics are identical with those of *** comparisons imply that the Lunbori specimen is closest to Plesiaceratherium gracile in the Shanwang Fauna from Linqu,Shandong Province,in size and ***,its age is suggested to be the late Early Miocene(Shanwangian Age),about 18-16 *** of the rhinocerotid fossil suggests that the upper part of the Dingqing Formation deposited in the *** adjusting to paleo-temperatures of the Early Miocene,a paleo-ecosystem reconstruction indicates that the paleo-elevation was close to 3000 m in the Lunpola Basin during this time.

关键词： Tibetan Plateau Lunpola Basin paleo-altimetry Miocene Dingqing Formation Rhinocerotidae

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