华北板块北缘东段中元古代造山带地质特征及构造演化

    MESOPROTEROZOIC OROGENIC BELT IN THE EAST PART OF THE NORTHERN MARGIN OF NORTH CHINA PLATE: Geologic Characteristics and Tectonic Evolution

    • 摘要: 研究区内的中元古代魏家沟岩群原岩为一套碳酸盐岩、陆缘碎屑岩及火山岩建造,形成于大陆裂谷-活动大陆边缘阶段,并于1036 Ma左右遭受变质变形.通过岩浆岩形成构造环境的判别,研究区中元古代岩浆活动贯穿于板块碰撞前、同碰撞及碰撞后.伴随着造山带的演化,本区中元古代经历了3期韧性变形,分别形成于大陆裂谷、活动大陆边缘及碰撞造山阶段.通过上述研究,确定了本区中元古代造山带的存在,并经历了大陆裂谷-被动大陆边缘-活动大陆边缘-碰撞造山的地质演化过程,证实了格林维尔造山运动在华北板块北缘的存在和对中元古代末期Rodinia超大陆拼合的响应.

       

      Abstract: The Weijiagou rock group, originally a suite of carbonate rocks, clastic rocks and volcanic rocks, was formed during the continental rift-active continental margin stage, with metamorphism and deformation occurred in 1036 Ma. Based on the the tectonic environment discrimination of magmatic rocks, the Mesoproterozoic magmatism of the studied area lasted throughout the pre-, syn-and post-collision periods. Accompanying with the evolution of orogenic belt, this region suffered three times of ductile deformation, which separately formed in the stages of continental rift, active continental margin and collision-orogeny. Research has determined the existence of the Mesoproterozoic orogenic belt in the studied area, which experienced the process of continental rift, passive continental margin, active continental margin and collision-orogeny. It is also confirmed that the Grenville orogeny took place in the northern margin of North China plate and responded to the convergence of Rodinia super continent in late Mesoproterozoic.

       

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