太平洋古陆的破碎消亡与中新生代华北克拉通板内构造岩浆活化

回顾了太平洋撞击成因假说的主要内容，重点围绕太平洋古陆消亡的内外动力学机制进行讨论，认为P／T之交发生在太平洋地区的撞击事件撞裂了岩石圈板块，导致岩石圈下的地幔对流方式发生重大转折．在这种全新的对流方式驱动下．太平洋古陆板块伴随新生洋壳板块的俯冲和碰撞而逐渐消亡并拼接到环太平洋大陆边缘，与此同时，环太平洋构造域开始形成．这种以太平洋构造域为中心的深部构造热体制深刻地影响了环太平洋大陆板块在中新生代的构造岩浆活动．

Disappearing Mystery of Ancient Pacific Land and Its Relationship with Mesozoic-Cenozoic Intraplate Magmatism in North China Craton

This paper reviews the main progress on the impact hypothesis of the Pacific Ocean for the past two decades and discusses the internal and external dynamics mechanism causing disappearance of ancient land of the Pacific Ocean. The impaction event which happened between Permian and Triassic at the Pacific Ocean area resulted in the crash of the Pacific lithospheric plate, and changeed greatly the mode of mantle convection. Under the action driven by the new mantle convection, ancient plate fragments of the Pacific Ocean withered away gradually and coalesced into the adjacent plates around the Pacific Ocean with the collision and subduction of paleo-pacific plate. At the same time, a tectonic system of the surrounding Pacific Ocean began to form. The deep tectonic-thermal regime embracing the surrounding Pacific Ocean tectonic system severely affected the magma activity in the continental plates ajacent Pacific Ocean during Mesozoic and Cenozoic.