太行山中段阜平群变质作用及其演化的PTtd轨迹  

THE METAMORPHISM AND PTtd PATH OF FUPING GROUP IN THE MIDDLE OF TAIHANG MOUNTAINS

作　　者：肖龙[1] 

机构地区：[1]桂林冶金地质学院地质矿产勘查系

出　　处：《桂林冶金地质学院学报》1992年第1期50-59,共10页

摘　　要：对阜平群构造变形分析、对变质岩中不同时期矿物组合的演化、变质岩系中主要变质矿物辉石、石榴石、角闪石和长石等矿物的成分、环带及反应结构等的研究结果表明,阜平群主要受三个变形变质旋回的影响;3个变质旋回分别与3个变形旋回相对应;阜平群主要构造变形的时间分别为2.79Ga,2.7Ga和2.56Ga。变质作用的温压条件分别为750～850℃,550～700℃,450～550℃,700～900MPa,700～800MPa,500～600MPa。In this paper, according to the studies of regional structure, com-position, mineral zoning and reaction structures of metamorphic mineralssuch as pyroxenes, particularly hypersthene, garnet,hornblende, plagioclase,K-feldspar and biotite of Fuping Group, the series of deformation-metamorphism and PT conditions of each metamorphic events has beenestablished. Fuping Group has gone through three tectonic-metamorphiccycles: (Ⅰ), (Ⅱ) and (Ⅲ). The three metamorphic cycles are correspoding tothree tectonic cycles. The ages of major deformations are Ⅰ-2:2.79Ga,Ⅱ-2:2.7Ga and Ⅲ-1: 2.56Ga.The T and P of metamorphism are 750～860℃,550～700℃, and 450～550℃; 700～900MPa,700～800MPa and 500～600MPa.

关 键 词：阜平群 矿物组合 变质作用 河北 PTtd轨迹 变形旋回 辉石 石榴石 P-T轨迹 同位素测年 角闪石 

分 类 号：P588.3[天文地球—岩石学] P597[天文地球—地质学]