摘要
鲁东-苏北地区出露了M型和Q型两类榴辉岩,前者的原岩为地幔岩类,后者的原岩为地壳岩类。它们均呈外来岩块产出于片麻岩中。其形成经历了前榴辉岩I、A和S阶段,在I和A阶段它们表现为韧性变形,而在S阶段则表现为碎裂变形。它们的折返过程经历了剪切回流和区域性隆起剥蚀。
Eclogites occurring in the eastern Shandong-northern Jiangsu region (SULU Eclogites) can be divided into two types based on their protoliths. One is called M-type, metamorphosed from mantle rock, and the other is called Q-type, from crustal rocks. Both types are of foreign blocks enclosed in surrounding gneiss. The evolution of the eclogites in the studied area took place in four stages, namely, stage of pre-eclogite, and stage I, A and S as shown in D. C. Smith's schedule. The deformation of the eclogites studied exhibits ductile feature in the stages I and A, but cataclastic feature in the stage S. The exhumation of the SULU Eclogites might proceed in two stages. The reverse shearing flow could preceed in the first stage, and the regional uplift and erosion in the second stage.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
1992年第2期153-160,T001,共9页
Acta Petrologica Sinica
基金
"扬子与华北陆块之间的碰撞构造与高压变质"研究项目的部分成果
中国科学院地质研究所岩石圈构造演化开放研究实验室提供经费
关键词
榴辉岩
构造混杂体
折返机制
Eclogite
Tectonic melange
Exhumation mechanism
