辽西中生代的壳幔过渡带的形成、破坏与改造
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摘要
利用火成岩及其携带的捕虏体的岩石学、年代学等研究成果,反演辽西中生代时期的壳幔相互作用,重塑这时期的壳幔边界组成。对应于中生代活跃的壳幔相互作用,辽西义县-北票一带理论上应该存在一个发育的壳幔过渡带。然而现今的各种地球物理研究显示辽西的莫霍面是清晰的间断面,其上、下地震波速变化从6.5~6.7km/s 截然变成8.0~8.1 km/s。壳幔过渡带到那里去了?围绕这一问题,本文依据火山岩及其捕虏晶的研究,探讨了在软流圈底辟体上涌背景下,壳幔过渡带被破坏和改造的原因。最后从演化角度将辽西与张家口和西藏高原的壳-幔边界进行了比较。
The Mesozoic crust-mantle interaction in west Liaoning province is studied according to petrologic and chronologic results of igneous rocks and xenoliths in them,and composition of the crust-mantle boundary in Mesozoic is reconstructed.Theoretically,there should be a developed crust-mantle transitional zone in Yixian-Beipiao area of west Liaoning province,where occurred active Mesozoic crust-mantle interaction.But the current Moho in the west Liaoning province is a clearly discontinuous interface with the seismic velocities above and below it being 6.5~6.7 km/s and 8.0~8.1 km/s respectively.Where the crust-mantle transitional zone could have gone?To answer this question,the authors explore the possible causes and processes of deformation and destruction of the crust- mantle transitional zone in the light of upwelling diapirs of asthenosphere.The crust-mantle-boundary structure in the west Liaoning province is also compared evolutionally with those in the Zhangjiakou area and in the Tibet plateau.
引文
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