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变角闪辉长岩体中以石榴石为核心的应变椭球体,一般3×5厘米,长轴展布方向与向斜轴向基本一致,按矿物组合,椭球体可分三类,一类以绿帘石、钠长石、磁铁矿为主;一类以钠长石、阳起石、磁铁矿为主;另一类以斜方辉石、钠长石、尖晶石、磁铁矿为主。结构构造特征基本相同,均以石榴石为核心,其他矿物呈放射状展布。由内向外可分为三个层圈。内层圈粒度最细,含磁铁矿最少;中层圈粒度变大,结构以似文象状、指纹状为主,由内向外磁铁矿含量逐渐增多,并富集于中层圈的外带,外层圈以碎裂构造为主,向外逐渐过渡为未变化的变角闪辉长岩。应变椭球体是在构造运动的压应力作用下,使原岩成分发生以相变为主的应变而形成。
In the variable angle gabbro body, garnet as the core of the strain ellipsoid, usually 3 × 5 cm, the distribution direction of long axis basically the same with the diagonal axis, according to the mineral combination, the ellipsoid can be divided into three categories, a The main types are epidote, albite and magnetite. One is albite, actinolite, and magnetite. The other is orthopyroxene, albite, spinel, magnetite Iron ore-based. Structure and structural characteristics are basically the same, all with garnet as the core, other minerals were radially distributed. From the inside out can be divided into three layers circle. The innermost layer has the smallest particle size and the smallest magnetite. The particle size of the middle layer becomes larger. The structure is similar to the image and the fingerprint is dominated. The content of magnetite in the inner layer increases gradually and enriches in the outer layer of the middle layer , The outer layer of the main structure of the fragmentation, gradual outward transition to the unchanging variable angle gabbro. Strain ellipsoid is under the action of compressive stress of tectonic movement, which causes the original rock component to take the phase change-based strain.