【摘要】 本文介绍了豫、晋、陕相邻地区西阳河群(熊耳群)火山岩的基本特征、形成构造环境及其地质遗产意义。西阳河群火山岩的结构、构造及沉积夹层特征表明,西阳河群火山岩经历了从陆相到海相、从海相再到陆相的演变过程。虽然它具有较明显的岛弧型火山岩特征,但它并不属于与俯冲作用直接相关的活动大陆边缘产物。研究表明,西阳河群火山岩源于遭受俯冲带组分改造的地幔源区,形成于夭折的三叉裂谷环境。西阳河群火山岩的发育规模和保存完好性十分罕见,其独特的岩石学特征和火山地貌景观,极具科学价值和美学观赏价值,是建立各级地质公园的重要地区。更多还原

【Abstract】 The basic characteristics, tectonic environment and geological heritage significance of Xiyanghe Group(Xiong’er Group) volcanic rocks distributed in the south of North China block are introduced in this paper. The characteristics of texture, structure and sedimentary interbeds indicate that the evolution of the Xiyanghe Group volcanic rocks had experienced the process from continental facies to marine facies and from marine facies to continental facies. Although they show obvious features of island arc-type volcanic rocks, they do not belonged the product directly related to the subduction of the active continental margin. The researchs show that the Xiyanghe Group volcanic rocks are derived from the mantle source region reformed by subduction-related components, and are formed in an environment of abortive trigeminal rift. The wide development scale and intact preservation of the Xiyanghe Group volcanic rocks are exceptionally rare, their unique petrological characteristics and volcanic landscapes possess high scientific and aesthetic enjoyment values, the distribution area of the Xiyanghe Group volcanic rocks are the important regions to built geopark of different grades.更多还原