The Closure Time of the Paleo-Asian Ocean and the Paleo-Tethys Ocean:Implication for the Tectonic Cause of the End-Permian Mass Extinction
The Closure Time of the Paleo-Asian Ocean and the Paleo-Tethys Ocean:Implication for the Tectonic Cause of the End-Permian Mass Extinction
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发表时间：
2009
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通讯作者：
Lian Qiu-sheng
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作者：
Lian Qiu-sheng
利用已有的古地磁资料，对南中国地块、西默陆块(包括保山、山泰和羌塘地块)、北中国地块和西伯利亚地块的古纬度和纬向位移进行了对比分析，确定了这些地块的碰撞和融合历史。结果表明：(1)晚二叠世宝山地块与南中国地块发生碰撞，并继续与中国地块、山泰地块一起快速北移，直至晚三叠世；(2)分离中国块体和西伯利亚块体的古亚洲大洋在二叠纪末期闭合，中国块体与西伯利亚块体在二叠纪末期(约250 Ma)发生碰撞：(3)大火成岩省末二叠世大灭绝、西伯利亚圈闭和峨眉山圈闭与古大洋最终闭合时间的年龄对比表明，大灭绝与这些古大洋的演化密切相关，表明大陆碰撞是造成这些古大洋大灭绝的主要构造原因。
A comparative analysis of paleolatitudes and latitudinal displacements was undertaken for the South China,Cimmerian continent(including Baoshan,Shan-Thai and Qiangtang blocks),the North China and Siberian blocks by using available paleomagnetic data to determine the collisional and amalgamation history of these blocks.The results show that(1)the Baoshan block collided with the South China block in the Late Permian and continued to drift rapidly northwards,together with the South China and Shan-Thai blocks,until the Late Triassic;(2)the paleo-Asian ocean separating North China and Siberian blocks closed in the end-Permian,and North China block collided with Siberian block in the end-Permian(ca.250 Ma);(3)the age correlations between the end-Permian mass extinctions,Siberian traps and Emeishan traps large igneous province and the final closure time of paleo-oceans show that the mass extinctions are closely related to the evolution of these ancient oceans,suggesting that the collision of continents are the main tectonic cause of end-Permian mass extinctions.