摘要：

秦岭褶皱带位于华北板块和扬子板块结合部位，其在河南省内的部分多划为东秦岭。东秦岭以商南-镇平缝合带分为东秦岭北部和东秦岭南部。东秦岭古生代生物古地理演变可以划分为6个阶段。在寒武纪至中奥陶世早期，东秦岭北部二郎坪海槽的寒武纪放射虫和早奥陶世牙形石与东秦岭南部淅川陆棚北部的寒武纪三叶虫、早奥陶世牙形石和头足类属华南生物省，而淅川陆棚南部的寒武纪三叶虫和早奥陶世牙形石属于华南生物省，兼有华北生物省分子。在中奥陶世晚期至奥陶纪末，二郎坪海槽的腹足类、头足类和珊瑚与淅川陆棚的牙形石、珊瑚、腕足类、头足类和三叶虫均属华北生物省。在早志留世，二郎坪海槽的珊瑚与淅川陆棚的笔石属华南生物省。在中志留世至早泥盆世，东秦岭未发现古生物化石，很可能为陆地，并与华北陆块联为一体。在中泥盆世至早石炭世，东秦岭北部柿树园海槽与东秦岭南部南湾海槽的孢子及淅川陆棚的晚泥盆世珊瑚、腕足类和古植物及早石炭世蜓属华南生物省。晚石炭世至二叠纪末，柿树园海槽的孢子见于华北生物省，东秦岭南部缺乏海相沉积。总之，在古生代，东秦岭经历了由华南生物省→华北生物省→华南生物省→华北陆→华南生物省→华北生物省6个阶段，组成3个演变旋回。东秦岭北部和南部生物古地理具有明显的演变方向的统一性和演变时间的相似性。

Abstract:

Qinling fold belt is located at the junction of the North China plate and the Yangtze plate, and its portion in Henan Province is a part of the East Qinling Mountains(EQM). The East Qinling Mountains can be subdivided into the northern and southern parts, which are separated by the Shangnan-Zhenping suture. Six stages of the Paleozoic biopalaeogeographical evolution can be recognized in the East Qinling Mountains. From the Cambrian to the early Middle Ordovician, the Cambrian radiolaria and the Early Ordovician conodonts of the Erlangping trough in the northern part of EQM, and the Cambrian trilobites and Early Ordovician conodonts as well as cephalopods of the northern Xichuan shelf in the southern part of EQM belonged to the South China Province, while the Cambrian trilobites and the Early Ordovician conodonts of the southern Xichuan shelf belonged to the South China Province with some elements of the North China Province. From the late Middle Ordovician to the end of  Ordovican, the cephalopods, gastropods and corals in the Erlangping trough, and the conodonts, coral, brachiopods, cephalopods as well as trilobites in the Xichuan shelf were from the North China Province. During the Early Silurian, the corals of the Erlangping trough and the graptolites of the Xichuan shelf belonged to the South China Province. From the Middle Silurian to the Early Devonian, no fossils were found in EQM, which probably was a land and connected with the North China block. From the Middle Devonian to the Early Carboniferous, the spores of the Shishuyuan trough in the northern part of EQM and those of the Nanwan trough in the southern part of EQM belonged to the South China Province, and the Late Devonian corals, brachiopods, plants , and the Early Carboniferous fusulinids of the Xichuan shelf were from the South China Province. From the Late Carboniferous to the end of Permian, the spores of the Shishuyuan trough were from the North China Province, and the marine sediments were absent in the southern part of EQM. During the Paleozoic times, six evolutionary stages in EQM  are from the South China Province to North China Province, then to South China Province to North China paleoland and finally to South China Province to North China Province ,which constitute three evolutionary cycles. In conclusion, the biopalaeogeography of the northern and southern parts of EQM indicates an obvious unity of the evolutionary directions and a similarity of the evolutionary times.