Magnetostratigraphy and pavleo-environmental record of Tertiary deposits of Lanzhou Basin |
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Authors: | Leping Yue F Heller Zhanxiang Qiu Li Zhang Guangpu Xie Zhuding Qiu Yunxiang Zhang |
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Institution: | YUE Leping, F. Heller, QIU Zhanxiang, ZHANG Li, XIE Guangpu, QIU Zhuding & ZHANG Yunxiang 1. Department of Geology, Northwest University, Xi'an 710069, China; 2. Institute of Geophysics, ETH-Honggerberg, CH-8093 Zurich, Switzerland; 3. Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China; 4. Provincial Museum of Gansu, Lanzhou 730050, China |
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Abstract: | The Tertiary deposits of the Yongdeng section, the Lanzhou Basin were studied by means of magnetostrati-graphy. The magnetostratigraphic sequences from Paleocene to Miocene were established, and the time scale for the corresponding stratigraphy and mammalian faunas was also established by referring to their correlation to the GPTS of BKSA95 (The geomagnetic polarity time scale which was thoroughly revised and updated by Berggreen et al. in 1995). In the end the paleoenvironmental records and their relationship with the uplifting of the Tibetan Plateau were discussed. The results are as follows. The top boundary of the Xiliugou Formation is dated to be 51 Ma, i.e. Eocene. TheYehucheng Formation covers the time span of 51-31.5 Ma, i.e. from late Early Eocene to early Early Oligocene. The Xianshuihe Formation covers the time span of 31.5-15 Ma, i.e. from Early Oligocene to Middle Miocene. The lower member of the Xianshuihe Formation spans from 31.5 to 20.0 Ma, i.e. from Early Oligocene to early Early Miocene. The middle member is from 20.0 to 16.5 Ma, i.e. in the middle Early Miocene. |
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Keywords: | paleomagnetic stratigraphy Lanzhou Basin Tertiary the Tibetan Plateau paleoenvironment |
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