华北古陆块南缘太华群高压麻粒岩及其构造环境研究

After the research,we point out that there is a paleostylolitic Zone lying in the south edge of North China nucleus.we have confirmed the tags of ancient oceanic crusts, melange,ancient island arc,back arc sedimentary basin, extension zone ,the TTG magma zone of continent edge and so on.In addition we inverted the point of pure stratum.The 207Pb/206Pb zircon analysis gives 2675±2Ma,the plateau and isochron age of hornblende of amphibolite from melange is 2372.98±47.46Ma and 2349.10±46.98Ma. An oldest oceanic crust maybe corroborated in the zone with advance research...

本课题以河南太华群为主，重点研究华北古陆块南缘高压麻粒岩，进行太华群内两条麻粒岩带的对比研究，以大地构造相分析理论为指导，查明高压麻粒岩带形成时的构造环境。并强化同位素示踪研究，尝试PTt轨迹与变质幔相结合的方法，探索华北古陆块南缘下地壳组成胩啤６粤私饣钡乜楣畔碌乜羌捌溆氡鼻亓胛⒌靥寮涞墓乖炝到兄匾庖濉