CAJ | 학술논문

大别造山带北部石竹河二长片麻岩的锆石U-Pb年龄测定结果表明,其原岩形成时代为707±42Ma,在229±18Ma曾受到高温变质作用。这一结果表明印支期变质作用不仅反映在大别造山带南部的变质岩中,而且造山带北部的部分变质岩也保存了这一重要记录。大别造山带北部存在印支期变质年龄的片麻岩、榴辉岩或残留相表明,该地块与造山带南部一样是印支期板块俯冲碰撞中俯冲板块的一部分。华北和扬子板块的碰撞缝合线可能位于大别造山带的北侧。
대별조산대북부석죽하이장편마암적고석U-Pb년령측정결과표명,기원암형성시대위707±42Ma,재229±18Ma증수도고온변질작용。저일결과표명인지기변질작용불부반영재대별조산대남부적변질암중,이차조산대북부적부분변질암야보존료저일중요기록。대별조산대북부존재인지기변질년령적편마암、류휘암혹잔류상표명,해지괴여조산대남부일양시인지기판괴부충팽당중부충판괴적일부분。화북화양자판괴적팽당봉합선가능위우대별조산대적북측。
The zircon U-Pb age of a monzogneiss from Shizhuhe in North Dabie was dated. The results indicate that the protolith of the gneiss was formed at 707±42Ma, and the rock underwent metamorphism at 229±18Ma. The ages suggest that the Indosinian metamorphism of the Dabie orogen affected not only the metamorphic rocks in South Dabie, and also some rocks in North Dabie. The gneiss with Indosinian metamorphic age, the occurrence of eclogites and eclogite-facies relics in North Dabie suggest that North Dabie was a part of the subducted block as the South Dabie. The suture line between North China Block and Yangtze Block may be in the north of Dabie orogen.