秦岭北缘巨型陆内俯冲带的深部物理状态

秦岭造山带是一个复合型大陆造山带。燕山末期——喜马拉雅初期由于华北板块相对于秦岭造山带的俯冲，在秦岭北缘形成巨型陆内俯冲带。反射地震剖面揭示该带为一向南倾斜的强反射波组带，并且在两侧显示出明显的差异；大地电磁测深剖面中该带表现为略向南倾的低阻带。南侧为高阻体，北侧为多层结构；流变学特征揭示，该俯冲带南部相似于造山带的核带，北部则相同于中、新生代的大陆汇聚带，充分证明了秦岭北缘巨型陆内俯冲带的存在。

DEEP GEOPHYSICAL REGIME OF HUGE INTRACONTINENTAL SUBDUCTION ZONE AT NORTH MARGIN OF QINLING

The Qinling mountains is a composite continental tectonic regime with distinct dynamics.The Yangtze plate,Qinling plate and Northern China plate achieved a full collision,and formed the northern Qinling overthrust in Indosinian.In Yanshanian early Himalayanian huge intracontinental subduction zone at the northern margin of the Qinling was formed between the Northern China and Yangtze cratons with intracontinental subduction.Characteristics of the geophysical fields show this huge intracontinental subduction zone.The crust to the north of the subduction is similar to Mesozoic Cenozoic convergence zone and the crust to the south of the subduction zone is similar to the core zone of Mesozoic Cenozoic orogenic belt.