摘要
反驳了传统的青藏高原隆起“印度板块碰撞成因说”。洋壳流力学认为,持续不断的海底扩张运动至今推动亚欧大陆作自南向北的漂移,但在北半球遇到大陆漂移极限带后,不能继续北进。由于不同区域的海底扩张力大小不一致,太平洋、印度洋、大西洋三大洋壳流相互形成力差,扩张力作用最大的太平洋洋壳流推动不能继续北进的亚欧大陆,以印度板块北端为支点,向力作用较小的方向作转向运动,使岩石圈物质形成自东向西的南北大回旋运动;在大回旋运动中形成堵点和拐点,产生全球地质运动力作用最大的区域,导致青藏高原的隆起。需要强调的是,本文并非否认印度板块在青藏高原隆升中的重大作用,只是指出:仅仅靠印度板块的碰撞力量并不足以产生如此雄伟的青藏高原。
The traditional"plate collision theory"for the Qinghai-Tibet Plateau uplift is refuted in this thesis.According to the theory of oceanic crust flow,the continuous sea-floor spreading has pushed the Eurasian continent to drift from south to north so far,but the drift stops when it encounters the continental drift limit zone in the Northern Hemisphere.The difference of seafloor spreading forces in different regions results in a force difference between oceanic crust currents from the Pacific,Indian and Atlantic Oceans.The Pacific Ocean crust current with the largest spreading force promotes the Eurasian continent,which cannot continue northward,taking the north end of the Indian plate as the fulcrum and pushing the lithosphere material to forms a large north-south cyclic movement from east to west.The uplift of the Qinghai-Tibetan Plateau resulted from the internal compression in the southern margin of the Eurasian plate.It should be emphasized that this thesis does not deny the important role of the Indian plate in the uplift of the Qinghai-Tibet Plateau,but points out that the collision force of the Indian Plate alone is not enough to produce such a magnificent Qinghai-Tibet Plateau.
作者
赵大咏
刘石年
ZHAO Da-yong;LIU Shi-nian(Yueyang Bureau of Civil Affairs,Yueyang,Hunan 414000;College of Geosciences,Central South University,Changsha 410083)
出处
《四川地质学报》
2021年第2期179-186,共8页
Acta Geologica Sichuan
关键词
海底扩张
漂移极限带
板块
参考架
洋壳流力差
堵点
拐点
sea-floor spreading
drift limit zone
plate
reference frame
oceanic crust flow force difference.
