摘要
鞍山地区的铁矿体主要处于三条巨大的韧性变形带中。在这些韧性变形带的形成过程中,组成铁矿体的磁铁石英岩经历了两次糜棱岩化作用的改造,早期磁铁矿为塑性变形,晚期磁铁矿为脆性变形,与此同时,在构造置换、剪切分异和流体参加等因素的影响下,磁铁石英岩中的条带状构造经历了两期从破坏到形成的旋回,组成条带的矿物组分重新迁移和分配,形成一系列反映其形成阶段和变形特点的条带状构造。
The iron orebodies in Anshan area are mainly located in three large ductile deformation belts. During the development of these ductile deformation belts, the magnetite quartzite composing the iron orebodies was encountered two episodes of mylonitization, the magnetite was plastically deformed at the early episode and brittlely at the late episode. Meanwhile, under the influence of structural transformation, shear differentiation and the infiltration of fluids, the banded structures in magnetite quartzite also underwent two cycles from breakdown to formation, the minerals forming banded structures were recombined, and a series of banded structures reflecting their developing stages and defoming features were formed.
关键词
太古宙
铁矿
成因
条带状
构造
banded structures, mylonitization, deformation belts, Anshan area
