阜平群的退变质作用——石榴石的生长和分解  

THE TREND OF REGRESSIVE METAM(ORPHTSM OF FUPING GROUP DETERMINED FROM THB GROWTH AND BREAKDOWN OF BLASTOPHYRITIC CRYSTAL GARNET

作　　者：肖龙[1] 

机构地区：[1]桂林冶金地质学院,桂林541004

出　　处：《矿物岩石》1992年第1期108-114,共7页Mineralogy and Petrology

摘　　要：本文通过阜平群下部基性麻粒岩中石榴石变斑晶的矿物化学、成分环带,包含变晶结构和冠状体结构的研究,结合石榴石生长前后温压条件估算,确定石榴石生长于区域麻粒岩高峰变质作用之后的近等压降温的热背景中,并由于后期阜平群的快速抬升而发生降压分解,最后利用石榴石的生长成分环带和降压分解现象揭示阜平群在麻粒岩相变质作用之后的退变质PTt轨迹。Based on the studies of mineral chemistry,zoned texture,inclusive minerals and corona textures of garnet from granulite of Lower Fuping,group,and with the help of pressure and temperature conditions that before and after the growth of garnet,it is determined thait blastoporphyritic crystal garnet at a situation with nearly isobaric and temperature-decreasing brokedown after rapid uplift of Fuping group. Finally the pTt path of regressive metamorphism of Fuping group is established.

关 键 词：石榴石 环带 阜平群 退变质作用 

分 类 号：P578.947[天文地球—矿物学]