%0 Journal Article
%T EVOLUTION OF THE LATE CENOZOIC MAMMALIAN FAUNAS IN THE LINXIA BASIN AND ITS BACKGROUND RELEVANT TO THE UPLIFT OF THE QINGHAI-XIZANG PLATEAU<br>临夏盆地晚新生代哺乳动物群演替与青藏高原隆升背景
%A Deng Tao
%A <br>邓涛
%J 第四纪研究
%D 2004
%I 
%X A continuous sedimentary sequence from the Oligocene to the Holocene is well developed and exposed in the Linxia Basin (Gansu, China), in which very abundant mammal fossils are discovered. The Linxia Basin is one of the regions with the richest Late Cenozoic mammal fossils in China as well as the whole Eurasia. The Late Oligocene Dzungariotherium fauna, the Middle Miocene Platybelodon fauna, the Late Miocene Hipparion fauna, and the Early Pleistocene Equus fauna are the most representative in the Linxia Basin. Mammals are very sensitive to climatic and environmental changes. The strong uplift of the Qinghai-Xizang Plateau during the Late Cenozoic greatly influenced climate and environment, which would be reflected from the evolution of mammalian faunas. The Linxia Basin is situated at the transitional zone between the Qinghai-Xizang Plateau and Loess Plateau. During the important period of the uplift of the Qinghai-Xizang Plateau in the Late Cenozoic, the Linxia Basin has the mammal fossil assemblages, which can determine geological ages, and the thick deposits, which can accurately reflect climatic variations. As a result, the Linxia Basin is a best site to study the uplift process of the Qinghai-Xizang Plateau and its influence to climate and environment. For the study to the Qinghai-Xizang Plateau, the Linxia Basin can correspond to or be better than the classical Siwaliks on the south margin of the Qinghai-Xizang Plateau. The ecological features of the distinct faunas indicate that the Linxia Basin came through great climatic and environmental changes: warm and humid forest mixed with some open lands in the Late Oligocene, denser forest with richer water bodies in the Middle Miocene, tropical semiarid savanna with strong seasonal variation in the Late Miocene, to cold and arid climate with high elevation in the Early Pleistocene. The particular geographical position of the Linxia Basin implies that the evolution of its mammalian faunas is tightly related to the uplift of the Qinghai-Xizang Plateau in the Late Cenozoic. The uplift of the Qinghai-Xizang Plateau was not enough to baffle the dispersal of large mammals between north and south of this plateau in the Late Oligocene, but it became an obvious barrier for the mammal migration in the Middle Miocene and more obvious in the Late Miocene. The Linxia Basin reached a relatively high elevation in the Early Pleistocene, so that a plateau or alpine mammalian fauna appeared in this area.
%K Linxia Basin
%K Late Cenozoic
%K mammalian fauna
%K Qinghai-Xizang Plateau<br>临夏盆地
%K 晚新生代
%K 哺乳动物群
%K 青藏高原
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=EA07051745CDC8D89D5F01A3A4CFE6A9&aid=9B70A592FAC0632F&yid=D0E58B75BFD8E51C&vid=B91E8C6D6FE990DB&iid=E158A972A605785F&sid=09AA1448D1EAF9C1&eid=5335AD3CFE6E14EA&journal_id=1001-7410&journal_name=第四纪研究&referenced_num=15&reference_num=40