摘要
闽东南沿海变质带实际上是由平潭—东山褶皱带和长乐—南澳断裂带所组成,前者是复杂的基底褶皱带,后者是大型的脆-韧性剪切带,它大体上是前者的西界。褶皱带的褶皱样式反映岩石在变质与变形时处于强塑性压扁及流变的机制。微观构造研究进一步获得变质构造岩在固态流变中的运动学和动力学特征。区域变质作用的温度为540—600℃,压力2400—3600Mpa。变质作用的高峰期约距今170Ma。
The metamorphic belt along the coast of Fujian Province is in fact composed of the Pingtan-Dongshan Folded Belt and Changle-Nan'ao Faulted Belt. The Pingtan-Dongshan Folded Belt is a folding zone of the complicated basement, while the Changle-Nan'ao Faulted Belt is a large-scale brittle-ductile shear zone and is located in the west side of the Pingtan-Dongshah Folded Belt. The fold patterns of folded belts show that the rocks in the folded belts are in the conditions of intensive plastic flattening and reheomorphism during metamorphism and deformation. The microstructural analysis including X-ray, magnetic petrofabrics and TEM data provide the kinematical and dynamic characteristics of the metamorphosed tectonite in the solid reheomorphism. It is inferred that the temperature of regional metamorphism is 540—600℃ and the pressure 2400—3600 MPa, and that the peak metamorphism took place in about 170 Ma
出处
《福建地质》
1993年第1期48-67,共20页
Geology of Fujian
关键词
长乐一南澳
断裂带
构造地质学
Changle-Nan'ao Faulted Belt, intensive plastic flattening, Pingtan-Dongshan Folded Belt, regional metamorphism, tectonic geology
