新疆古生代构造-生物古地理

摘要

通过6幅图表达了新疆古生代板块的构造-生物古地理区系。早古生代，包括劳伦、波罗的、西伯利亚和哈萨克斯坦4陆块的亚帕特斯古陆(Iapetusa)群，与由其余陆块构成的冈瓦纳古陆群隔原特提斯洋相对峙。石炭─二叠纪，欧美、安加拉、太平洋和冈瓦纳4古陆共存并立。西伯利亚和哈萨克斯坦板块经历了早古生代亚伯特斯古陆、晚古生代安加拉古陆和早二叠世晚期以来欧亚大陆3个发展阶段。塔里木、中朝、华南-东南亚板块经历了早古生代冈瓦纳古陆、晚古生代太平洋古陆和早二叠世晚期以来欧亚大陆3个发展阶段。指出在中晚寒武世和晚奥陶世哈萨克斯坦板块靠近塔里木、中朝和华南-东南亚板块；在早古生代其余时期它接近西伯利亚板块。伊犁和托克逊─雅满苏地体是在中泥盆世之前裂解自塔里木板块，尔后在早二叠世晚期接近安加拉古陆。塔里木板块北东缘北山地区在早二叠世早期首先靠近安加拉古陆。塔里木与西伯利亚─哈萨克斯坦板块之间缝合时代大抵上和土耳其-中伊朗-冈底斯与华南-东南亚板块之间缝合时代一致。缝合事件发生在早二叠世早期，而相应的构造运动出现在早晚二叠世之交。%Paleozoic tectono-paleobiogeographic provinces of the Xinjiangancient plates are expressed through six figures. The Iapetusaland group including four blocks of Laurentia, Baltica, Siberia and Kazakhstan and the Gondwananland group made up of the remaider continental blocks faced each other separated by the Prototethys in the Early Paleozoic. In the Permo-Carboniferous the four oldlands of Euramerica, Angara, Pacifica and Gondwana coexisted side by side simultaneously. The Siberian and Kazakhstanian plates took part in the three developmental stages of the Early Paleozoic Iapetusa, Late Paleozoic Angara and Eurasia since the late Early Permian. The Tarim, Sinokorean and South China-Southeast Asian plates underwent the three developmental stages of the Early Paleozoic Gondwana, Late Paleozoic Pacifica and Eurasia since the late Early Permian. It is pointed out that the Kazakhstanian Plate came near the Tarim, Sinokorean and South China-Southeast Asian plates in the Middle-Late Cambrian and Late Ordovician, and it got close to the Siberian Plate in the remaider period of the Early Paleozoic. The Ili and Toksun-Yamansu terranes ware split from the Tarim Plate before the Middle Devonian and then they came close to the Angaraland in the late Early Permian. The Beishan area of the northeast margin of the Tarim Plate came close to the Angaraland in first in the early Early Permian. The suturing age between the Tarim and Kazakhstanian-Siberian plates is generally the same as that between the Turkey-Central Iran-Gangdise and South China-Southeast Asian plates. The suturing event occurred in the early Early Permian, while the corresponding tectogeny appeared between the Early and Late Permian.