云南省板块构造与古生物地理区的划分

作者根据云南省的地层、古生物地理区和古地磁资料的综合分析，将其划分为杨子板块、澜沧板块和保山板块。这三个构造单元中，前二者的古生物群基本相同，属于南方古生物地理区，后者发育了冈瓦纳相沉积，属于滇西古生物地理区。据现有古地磁数据，杨子板块从寒武－石炭纪位于南半球，自二叠纪才开始漂移到北半球地区；保山和澜沧二个板块，在古生代时期处于南半球区，之后它们分别在晚二叠世末期、三叠纪迁移入北半球。最后，在中侏罗世三个板块发生了相互碰撞，从而拼合为一个整体。

PLATE TECTONICS AND BIOGEOGRAPHICAL REGIONALIZATION OF YUNNAN PROVINCE

On the basis of an integrated analysis of stratigraphic, paleontologic and paleomagnetic data,Yunnan Province may be tectonically divided into the Yangtze plate, Lancang plate and Baoshanplate. Among the three tectonic units, the types of biotas in the first two tectonic units are in themain identical, belonging to the Meridional biogeographical region; whereas in the last unit thereoccur Gondwanic deposits, which belong to the western Yunnan biogeographical region. Fromthe paleomagnetic data, in the Cambrian to Carboniferous the Yangtze plate was located in thesouthern hemisphere, and since the Permian it gradually drifted to the northern hemisphere. TheBaoshan and Lancang plates were both situated in te southern hemisphere in the Paleozoic andthen they migrated respectively into the northern hemisphere in theterminal Late Permian andTriassic. At last, in the Middle Jurassic the three plates collided and thus were an1algamated intoan entity.