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内蒙集宁三岔口地区早前寒武纪经历两期麻粒岩相交质作用。第一期变质作用发生于2.5Ga,变质作用峰期温度为770～850℃,压力为0.85～1.0GPa,属于迅速增温增压到降温降压的P-T-t演化轨迹,这和本区变质岩系发生构造加厚作用有关.第二期变质作用发生于2.0Ga,变质作用峰期温度为800士20℃,压力为0.53～0.68GPa,其P-T-t轨迹属于典型的造山带型演化模式。
Early Precambrian experienced two stages of granulite-grazing interaction in Jining, Jining, Inner Mongolia. The first metamorphism occurred at 2.5Ga, the metamorphic peak temperature was 770 ~ 850 ℃ and the pressure was 0.85 ~ 1.0GPa, belonging to the PTt evolutionary trajectory from rapid warming and pressurization to cooling and depressurization, which was consistent with the metamorphic rocks Occurrence of tectonic thickening.The second metamorphism occurred at 2.0Ga, the peak temperature of metamorphism was 800 ± 20 ℃ and the pressure was 0.53 ~ 0.68GPa, and the PTt locus belonged to the typical orogenic evolution pattern.