解析 据地质学家估计,大板块每年可以移动1-6厘米距离.这个速度虽然很小,但经过亿万年后,地球的海陆面貌就会发生巨大的变化:当两个板块逐渐分离时,在分离处即可出现新的凹地和海洋;大西洋和东非大裂谷 就是在两块大板块发生分离时形成的.当两个大板块碰撞挤压时,就可出现高山、高原,喜马拉雅山就是三千多万年前由...
Plate Driving Forces: The forces that drive the motions of tectonic plates at the surface. Slab Pull: The force exerted by the weight of the subducted slab on the plate it is attached to. Ridge Push:...Lithgow-Bertelloni, Carolina
Learn about slab pull and the slab pull definition. Discover how this operates in a subduction zone and the difference between ridge push and slab...
The motion of tectonic plates at the Earth’s surface is the most direct observation of large-scale mantle flow reflecting the time-dependent balance of driving and resisting forces acting on the base of the plates and through slab-pull and ridge push (Forsyth and Uyeda, 1975, Lithgow-Bertello...
A temporary halt in rifting at the pull-apart opening stage and northeastward veering of the Andaman sea ridge (ASR) were apparently controlled by upliftment of oceanic crust in post-middle Miocene time in form of Alcock and Sewell seamounts, lying symmetrically north and south of this ...
Neutral surface depth is computed integrating the stresses of the brittle, elastic and plastic domains, equaling the bend momentum supported by the upper tensional domain and the lower compressional domain25. No external stresses, including ridge push, trench pull or mantle drag forces were added ...
between serpentinized faults9,17. Significant Tertiary deformations in Vrancea as well as intra-Carpathian block rotations resulted from actual slab pull forces during slab verticalization until the mid-Miocene, along with lateral tectonic forces (Adria push), and both types of forces appear to have...
Abbreviations: CSB—Coral Sea Basin; EbB—Emo backarc Basin; GC—Gulf of Carpentaria; LHR—Lord Howe Rise; MP—Marion Plateau; NCNR—New Caledonia–Norfolk Ridge; NCsz—New Caledonia subduction zone; Nd'EB—North d'Entrecasteaux Basin; NG–Psz—New Guinea–Pocklington subduction zone; PT—...
ridge push forceIt has remained unclear how much of the negative buoyancy force of the slab (F) is used to pull the trailing plate at the surface into the mantle. Here I present three-dimensional laboratory experiments to quantify the net slab pull force (F) with respect to Fduring ...
Around 55 Ma, subduction of the Pacific-Izanagi ridge reconfigured the major tectonic forces acting on the plate by replacing ridge push with slab pull along its northwestern perimeter, causing lithospheric extension along pre-existing weaknesses. Large-scale deformation observed in the models coincides...