摘要
通过对新近发现的连云山杂岩空间分布特征、岩相学、变质作用期次等的深入研究,表明它们经历了五期变质作用,即吕梁运动导致初始的埋藏变质作用以及随后深埋到33km深度的近高压绿片岩相变质作用和角闪岩相作用。此后因基性岩浆多次底侵和基底活化,连云山杂岩在晋宁期和燕山期遭受过多期次的局部高角闪岩相的变质作用,最后随湘东北盆—岭构造的形成和发展而进入退变质阶段,整个过程为近顺时针方向演化的P-T轨迹。其P-Ttd轨迹揭示了湘东北地区壳幔间相互作用过程和热历史演变。
Primary research on distribution,petrography and metamorphism of the new discovered Lianyunshan complex,indicates a complicate metamorphic history of five stages.They are burial metamorphism due to the Lüliang movement,and the subsequent high pressure greenschist facies and low amphibolite facies metamorphism at a depth around 33km. The Lianyunshan complex suffered high amphibolite facies metamorphism locally during the Jinning and Yanshan periods. Final retrograde stage started when the NE Hunan basin-mountain system developed.The clockwise P-T-t path of the Lianyunshan complex revesals the crust-mantle interaction process and the geothermal evolution history.
出处
《资源调查与环境》
2002年第4期235-243,共9页
Resources Survey & Environment
