CAJ | 학술논문

华北陆块南缘汝阳群下部的次火山岩一直被看作是与汝阳群同时代的火山喷发夹层。通过研究测得玄武岩SHRIMP锆石U-Pb年龄为213.5±2.4Ma，并在邻近该次火山岩层上部的紫红色泥岩中发现了褪色的角岩化现象，说明该火山岩是晚三叠世沿汝阳群下部顺层侵入的次火山岩岩床。通过对该次火山岩岩石及其地球化学特征的研究，认为该次火山岩起源于有早期俯冲洋壳或陆壳参与再循环的大陆富集型地幔的部分熔融，它与秦岭造山带几乎同时代形成的超高压榴辉岩、埃达克质岩石、高钾钙碱性花岗岩、环斑花岗岩等共同揭示了秦岭造山带自中三叠世全面碰撞造山之后，由碰撞挤压逐渐转变为伸展拉张的深部动力学过程。
화북륙괴남연여양군하부적차화산암일직피간작시여여양군동시대적화산분발협층。통과연구측득현무암SHRIMP고석U-Pb년령위213.5±2.4Ma，병재린근해차화산암층상부적자홍색니암중발현료퇴색적각암화현상，설명해화산암시만삼첩세연여양군하부순층침입적차화산암암상。통과대해차화산암암석급기지구화학특정적연구，인위해차화산암기원우유조기부충양각혹륙각삼여재순배적대륙부집형지만적부분용융，타여진령조산대궤호동시대형성적초고압류휘암、애체극질암석、고갑개감성화강암、배반화강암등공동게시료진령조산대자중삼첩세전면팽당조산지후，유팽당제압축점전변위신전랍장적심부동역학과정。
Subvolcanic rocks of the lower Ruyang Group were formerly regarded as the volcanic eruptive interlayer in the same-aged Ruyang Group on the southern margin of North China Craton. The authors obtained the zircon SHRIMP U-Pb age of 213.5± 2.4Ma from the zircon samples among the basalt and discovered the discolored hornfels inside the purple red mudstones near the up?per subvolcanic rock layer, which suggests that the subvolcanic sill was concordantly intruded into the lower Ruyang Group during late Triassic. The subvolcanic rocks originated from the early subducted oceanic or continental crusts and was formed by partial melt?ing of recirculated continental enriched mantle, as shown by petrological and geochemical characteristics of subvolcanic rocks. The subvolcanic rocks and the genesis of the same-aged ultrahigh-pressure eclogites, adakitic rock, high-K calc-alkaline granite and rapakivi granite in the Qinling orogenic belt all reveal the gradual deep dynamic process from the colliding extrusion to crustal exten?sion after the whole colliding orogeny of the middle Triassic in Qinling orogenic belt.