OBDUCTION

On the obduction of marginal plate and its effect on inner - plate structures

试论板缘仰冲作用及其对板内构造的影响

There are two original viewpoints , obduction and subduction , in the development history of plate tectonics theory .

板块学说发展史上存在着造山作用的仰冲和俯冲两种成因观点。

Before and after the plate collision : the transformation from subduction to obduction

板块碰撞前后：俯冲向仰冲之转化

Higher temperature at the obduction zone . These two zones are parallel each other and constitute the paired metamorphic belts .

并提出了在推覆型韧性剪切带强应变带两侧岩石具有不同压力类型，俯冲侧压力值较高，仰冲侧温度值较高，两者彼此平行，构成变质双带。

The intensive ductile shear deformation in this subduction complex belt represents the deformation behavior of deep crustal level in the process of subduction to obduction / orogeny .

蓝片岩带中强烈的韧性剪切变形作用代表了本区古板块持续俯冲到碰撞过程中地壳深部层次的变形行为。

In the ending stage of orogeny , upper level ductile - brittle broad fold , regional homoclinal - overturned fold and brittle obduction occured .

造山运动末期，发育浅层次韧脆性开阔褶皱、区域性同斜倒转褶皱及逆冲断层。

The fracture zone is composed of a series of ductile shear zones , obduction fault zones , fault basin zones , nappes , brittle fault zones , and strike slip faults .

研究表明，甘孜&理塘断裂带是由韧性剪切带、逆冲断裂带、断陷盆地带、推覆构造带、脆性破碎带和平移走滑带相互叠加、改造而形成的复杂断裂带。

The early Mesozoic thrust nappe structure in western Fujian is composed of three basic tectonic units : the crystalline basement obduction zone in the central part and the cover fold thrust zone in the east .

闽西地区的早中生代逆冲推覆构造由3个基本构造单元组成：西部结晶基底仰冲带、中部活化基底剪切滑脱带和东部盖层褶皱冲断带。

The evolution of the former is marked by the closure of a northward subducting oceanic basin in the early stage , followed by southward obduction of ophiolites and intracontinental thrusting during the Varisecan ;

北部古生代褶皱带演化，早期表现出一个向北俯冲的大洋盆地的闭合，随后蛇绿岩向南仰冲和华力西期的陆内逆冲推覆作用；

According to the structural analysis , these have been divided into several composed types such as bedding ductile shear zone , Alpinotype folds , Mt Jura_type folds , transition shear zone , obduction nappe structure and horst_graben structure .

通过构造解析划分出了顺层韧性剪切带、阿尔卑斯式褶皱、侏罗山式褶皱、过渡性剪切带、逆冲推覆构造及地垒-地堑式构造等组合类型。

The ultra-high pressure metamorphic belt was uplifted rapidly by obduction to the middle crust in the process of continuous subduction-obduction in the collisional tectonic setting , so it was an allochthon thrust on the subducted basement of the Yangtze plate .

超高压变质带形成于扬子和中朝板块大陆碰撞的构造环境，是扬子板块陆壳向北俯冲到一定深度的变质产物。