内蒙古东南部孔兹岩系进变质过程矿物组合演化——来自锆石中矿物包裹体的证据

Evolution of mineral assemblages of khondalite series in the process of prograde metamorphism,southeastern Inner Mongolia —Evidence from mineral inclusions in zircons

采用激光拉曼技术,确认内蒙古中南部孔兹岩系锆石中保存进变质阶段矿物组合蓝晶石+钾长石+石英+磷灰石,蓝晶石+石榴石+钾长石+石英;峰期阶段矿物组合夕线石+石榴石+钾长石+石英,夕线石+石榴石+钾长石+石英+磷灰石。表明孔兹岩系在变质过程中矿物组合及相应的PT轨迹经历了自蓝晶石稳定区向夕线石稳定区的转变。

Inclusions of the kyanite+K-feldspar+quartz+apatite and kyanite+garnet+K-feldspar+quartz assem-blages of the prograde metamorphic stage and the sillimanite+garnet+K-feldspar+quartz and sillimanite+gar-net+K-feldspar+quartz+apatite assemblages of the peak metamorphic stage were identified by laser Raman spectroscopy in zircons from the khondalite series in south-central Inner Mongolia.These data indicate that the mineral assemblages and P-T path of khondalites series experienced transformation from the kyanite sta-bility field to sillimanite stability field.