Two types of ductile deformation/regional metamorphic belt
Two types of ductile deformation/regional metamorphic belt
复制标题
两种类型的韧性变形/区域变质带
DOI：
10.1016/0040-1951(85)90203-3
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发表时间：
1985
期刊：
影响因子：
2.9
通讯作者：
M. Toriumi
中科院分区：
文献类型：
--
作者：
M. Toriumi
区域变质岩的塑性应变几何形态可分为两种：一种是单轴拉伸应变（长轴），另一种是双轴缩短应变（扁轴），从平面应变/简单剪切变形到单轴缩短变形。Sambagawa带、Ryoke带、Kamuikotan带和Franciscan带的变形为单轴拉伸变形，Shimanto带、Alpine带、Appalachian带和Caledonian带的变形为双轴拉伸变形，应变几何学和应变路径对变质带的划分与变质相系无关。变质带应变几何学的差异是造成变质作用构造应力状态的主要原因。双轴型属碰撞型造山带，单轴型属科迪勒拉型造山带。
The geometry of plastic strains of regional metamorphic rocks is divided into two types: one is the uniaxial extension strain (prolate) and the other the biaxial shortening strain (oblate) from the plane strain/simple shear to the uniaxial shortening geometry. The uniaxial extension geometry is found in deformation of metamorphic rocks of the Sambagawa, Ryoke, Kamuikotan and Franciscan belts, while the biaxial type is seen in deformation of the Shimanto, the Alpine, the Appalachian, and the Caledonian metamorphic rocks.The classification of the metamorphic belts by means of strain geometry and strain path is independent of the metamorphic facies series. The difference in strain geometry of metamorphic belts is responsible mainly for the tectonic stress regime in metamorphism. It is suggested that the biaxial type belongs to the collision-type orogeny and the uniaxial type to the Cordilleran-type orogeny.