【摘要】 根据火山岩、沉积岩、变质作用与花岗岩成岩和形成环境的综合研究,本文确认熊耳群玄武粗安岩-英安流纹岩组合、大红口组粗面岩组合具低级壳幔热动力状态,形成于大陆裂谷环境;秦岭群、宽坪群变拉斑玄武岩建造具中级壳幔热动力状态,形成于海槽环境;二郎坪群、丹凤群细碧岩-石英角斑岩建造发育于高级壳幔热动力状态的海盆环境,具有下地幔岩石圈拆离导致的A型俯冲造山模式。更多还原

【Abstract】 Based on the multidisciplinary genesis studies of volcanics, sedimentary rocks, granites and metamor-phism, it can be concluded that the bimodal basaltic trachyandesite-rhyodacite association of the Xionger group and the trachyte association of Dahongkou Formation developed in the continental rifts of the low grade crust-mantle thermodynamic state, and that the metatholeiite formations of the Qinling gronp and Kuanping group belong to the sea trough tectonic settings of the medium grade crust-mantle thermodynamic state. It also can be believed that the spilite-quartz-keratophtre formations of the Erlangping group and the Danfeng group developed in the sea basin tectonic settings of the high grade crustmantle thermodynamic environment with an origenic model of a northward type A subduction of delamination which was led by the sinking of the dense subcrustal mantle lithosphere.更多还原