%0 Journal Article
%T SPATIAL CHARACTER RECONSTRUCTION OF DIFFERENT PERIODS IN OLIGOCENE AND MIOCENE<br>根据地质记录恢复渐新世和中新世不同时期环境空间特征及其意义
%A ZHANG Zhongshi
%A GUO Zhengtang
%A <br>张仲石
%A 郭正堂
%J 第四纪研究
%D 2005
%I 
%X Previous studies illustrated that the Tertiary paleoenvironmental pattern in China was dominated by roughly zonal climates resulted from the planetary wind systems. Conspicuous changes had occurred for the Neogene when the originally arid south-western and south-eastern part of the country became much more humid and the geographic location of arid region in the north China was further close to the present-day status, indicating the initiation of the East Asian monsoon and inland-type aridity. More geological evidences indicated that the boundary of Oligocene and Miocene was the key time of the change. It is necessary to reconstruct the environmental patterns of different periods in Oligocene and Miocene. Here, we attempt to compile a series of paleogeographical maps based on newly collected climate indicators from the literature and age-controllable evidence of geological maps in order to re-examine the temporal and spatial evolution of climate belts in China during the Oligocene and Miocene with special emphasis on the changes of the arid belt. These newly collected indicators include mammalian faunas, coal, carbonate concretions, jarosite, salt, gypsum deposits and pollen assemblages with reliable chronological controls and etc. Pollen assemblages and mammalian faunas have been classified into three categories, arid, semi-arid/sub-humid, humid, to reflect the intensity of aridity/humidity. And salt, jarosite, and gypsum deposits are classified into the arid category. Carbonate concretions and coal are classified into the semi-arid/sub-humid and humid one respectively. Paleogeographic maps of the arid belts corresponding to five time slices have been reconstructed. They are the Oligocene, Miocene, Early Miocene, Middle Miocene and Late Miocene. The obtained results essentially confirm the earlier conclusions about the change of the East Asian environmental patterns from planetary wind system dominating type to monsoon system dominating type. The environmental pattern of monsoon system dominating type has formed by the earliest Miocene, which is consistent with the onset of eolian deposits in China.
%K Oligocene
%K ) Miocene
%K environmental patterns
%K monsoon<br>渐新世
%K 中新世
%K 环境格局
%K 季风环境
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=EA07051745CDC8D89D5F01A3A4CFE6A9&aid=F9E3D5AFE4AB9BD4&yid=2DD7160C83D0ACED&vid=C5154311167311FE&iid=E158A972A605785F&sid=C81D738643975BB0&eid=BB98BB04E861B6F5&journal_id=1001-7410&journal_name=第四纪研究&referenced_num=6&reference_num=64