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通过对暹缅马苏和澳大利亚奥陶系层序和动物群的研究,对早古生代期间泰国和马来西亚(暹缅马苏地块)曾毗邻澳大利亚这一假说进行了验证.那些生长在较窄的地理环境中的鹦鹉螺类在两个地区惊人地相似,属一级辛普生系数为0.92.盘珠角石类的两个新属仅限于这两个地区,而Georgina及Mesaktoceras则仅见于这两地区以外的西藏.两地的腹足类、多板类、喙壳类软体动物非常相似.奥陶纪的腕足动物门亦相似(包括Spanodoata).另外,两地的晚寒武世三叶虫化石、奥陶纪牙形石及层孔虫类亦非常相似.研究过程中无论是在北澳大利亚,还是在遏缅马苏均未发现其年代比上怀特罗克阶更新的动物群,两地大部分地区从上怀特罗克阶到上奥陶统之间的层序可能缺失.这些动物群的极度相以性为我们提供了关于早古生代期间暹缅马苏地块曾毗邻澳大利亚这一假说的较好证据.华北、东南亚、西藏和澳大利亚在动物群上的相似性亦表明,在早古生代,这些地块的地理位置很接近.
The hypothesis of the proximity of Australia to Thailand and Malaysia during the Early Paleozoic (the Mui Sapi area of Siem Reap) was validated by studying the Ordovician sequence and fauna in Massu, Siem Reap and Australia. Those that grew in narrower Nautilus in geography is strikingly similar in both regions, with a first-level Simpson coefficient of 0.92. Two new genera of the Pernaeta are limited to these two regions, whereas Georgina and Mesaktoceras are found only in these two regions Tibet. The gastropods, the multi-plate, and the beak-shell molluscs in both regions are very similar. The Ordovician brachiopods are similar (including Spanodoata). In addition, the Late Cambrian trilobite fossils, Ordovician teeth The petrolatum and stratosphere insects are also very similar, and neither the North Australian nor the Mauser in the study found any fauna younger than the upper White Rock. Most of the two regions, from the Upper White Rock The sequence of the Upper Ordovician may be missing.The extreme facies of these fauna provide us with good evidence of the hypothesis that the Siem Reap Massaci block was adjacent to Australia during the Early Paleozoic.North China, The similarities in fauna in Southeast Asia, Tibet and Australia also indicate that in the early Paleozoic these plots were very close to each other.