摘要
长沙—平江动力变质带是组成湘东北中生代地洼型拉伸构造型式的剥离断层带,其中的糜棱岩是大型韧性滑脱剪切作用的产物。文中重点阐述了糜棱岩的构造及地球化学特征及其成因意义,表明该断裂带的动力变质作用与大规模的地洼岩浆活动有着密切的生成联系,这可能是地洼构造演化的一个重要特征。
The Changsha—Pingjiang fracture dynamic metamorphism zone is a denudational fracture zone which constitutes the Mesozoic diwa-type extensional structure in northeastern Hunan Province. Mylonites in it are the products of large-size detachment-shearing. The paper puts emphasis on the structural and geochemical features of mylonites and their genetic significance. Researches suggest that dynamic metamorphism in the fracture zone is closely related genetically to widespread diwa magmatic activities. This probably is an important feature of diwa tectonic evolution.
出处
《大地构造与成矿学》
EI
CAS
CSCD
1991年第2期100-109,共10页
Geotectonica et Metallogenia
关键词
糜棱岩
构造
地球化学
断裂
变质带
fracture dynamic metamorphism zone, mylonite, structure and geochemistry, Changsha—Pingjiang, northeastern Hunan, China.
