CARBONIFEROUS AND PERMIAN ZOOGEOGRAPHICAL CHANGE OF THE BAOSHAN BLOCK, SOUTHWEST CHINA
CARBONIFEROUS AND PERMIAN ZOOGEOGRAPHICAL CHANGE OF THE BAOSHAN BLOCK, SOUTHWEST CHINA
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发表时间：
2000
影响因子：
1.1
通讯作者：
W. Xiang;Liao Yi
中科院分区：
文献类型：
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作者：
W. Xiang;Liao Yi
保山地块石炭、二叠系主要由下石炭统碳酸盐岩层序、下二叠统硅质岩层序和中二叠统碳酸盐岩层序组成。这三个层序被两个主要的海退事件所打断：Serpukovian至Gzhelian的纳穆里期海退事件和保山地块Artinskian之后的后Sakmarian海退事件，但其确切时间间隔尚不清楚。保山地块早石炭世以暖水、高多样性和丰富的动物群为特征，早二叠世以冷水、低多样性为特征，中二叠世以暖水、低多样性为特征。牙形石Sweetognathus bucaramangus动物群的年龄限制硅质沉积物的顶部边界，其中包含冰川海洋起源的杂岩，是Sakmarian早期Artinskian。在古动物地理上，保山地块动物群的归属经历了从早石炭世的欧亚动物群、早二叠世的滨冈瓦纳动物群到中二叠世的边缘华夏动物群/Cimmerian动物群的明显变化。在石炭纪和二叠纪中，辛梅利期的岩块或多或少可以相互比较。在中二叠世，西布马苏、保山和腾冲等西梅阶东部地块距离热带古赤道不远，但根据有无指标类群（如fusulinidae Eopolydiexodina和Neoschwagerina）、珊瑚类（如珊瑚类）和白珊瑚类（如Wentzellophyllum persicum），西梅阶东部地块比西梅阶地块更远。
The Carboniferous and Permian of the Baoshan block consist of three major depositional sequences: the Lower Carboniferous carbonate sequence, the Lower Permian siliciclastic sequence, and the Middle Permian carbonate sequence. These three sequences were interrupted by two major regressive events: the Namurian Uplift ranging in age from Serpukovian to Gzhelian and the Post Sakmarian Regression occurring after Artinskian in Baoshan block but its precise time interval is still unclear. Baoshan block was characterized by warm water, highly diverse, and abundant faunas during the Early Carboniferous, by cold water and low diverse faunas during the Early Permian, and by warm water but low diverse faunas during the Middle Permian. The conodont Sweetognathus bucaramangus fauna provides age constrain to the top boundary of the siliciclastic deposits, which contain glacio marine origin diamictites, to be Sakmarian to Early Artinskian. Paleozoogeographically, affiliation of the faunas in Baoshan block experienced apparent changes from the Eurasian in the Early Carboniferous, the Peri Gondwanan in the Early Permian to the Marginal Cathaysian/Cimmerian in the Middle Permian. Cimmerian blocks are more or less comparable one another in the Carboniferous and Permian. During the Middle Permian, the eastern Cimmerian blocks such as Sibumasu (s.s), Baoshan, and Tengchong are not far from the tropical palaeoequator, but further than the western Cimmerian blocks in light of the presence or absence of the index taxa such as fusulinids Eopolydiexodina and Neoschwagerina , corals Thomasiphyllum and Wentzellophyllum persicum.