东秦岭造山带的流变学及动力学分析

通过地质、地球物理和地球化学资料分析,建立了东秦岭地学断面带地壳二维深度-强度剖面,揭示了该造山带的地壳结构和流变学分层性．脆性的上地壳南薄北厚;中、下地壳包括莫霍面呈现水平流变状态,南端蠕变特征更明显;上地幔流变强度较大其地壳类型是栾川以南为H型地壳,构成中、新生代造山带的核部,具有伸展构造和走滑构造的特征,栾川以北为C型地壳,中、新生代的大陆汇聚带．东秦岭地学断面带整体上看为C-H型地壳,反映了后造山期陆内造山的构造特征．地壳物质为长英质-石英闪长质壳内软层具有低速、高热、强网状反射和低强度蠕变的地球物理特征,是后造山期经过调整的水平流变层.

RHEOLOGY AND DYNAMICS OF THE EASTERN QINLING OROGENIC BELT

The Qinling mountains are a composite continental tectonic regimes by distinct dynamics. Two-dimensional rheological model along the eastern Qinling transection shows a brittle upper crust.Both of middle-lower crust and Moho are level ductile layers. Uppermost mantle has a larger creep strength. This is a rheologically stratified lithosphere. The type of the eastern Qinling crustal structure is the model C-H. On the north of Luanchuan crust is similar to Mesozoic-Cenozoic continental convergence zone and is similar, to the "core zone"of Mesozoic--Cenozoic orogenic belt on the southern of Luanchuan. The eastern Qinling orogenic belt has a granitic/quartz diorite crust. Intracrustal asthenosphere has a lowvelocity, hot gootherm and low creep strengths, and formed in Mesozoic-Cenozoic.