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在川西滇东地区的前寒武系变泥质岩地层中采了263个样品并测了其白云母b_0值,结果表明:渡口运动时发生低压高温的变质作用;川滇运动时在河口组及相应地层发育区发生中压变质作用,向两侧变质压力降低;晋宁运动挤压幕第Ⅰ期形变时发生低压变质作用,第Ⅱ期形变时发生中-高压变质作用,第Ⅲ期形变和澄江运动时发生中压变质作用。基于这一工作探讨了白云母b_0值研究在进行地层对比和构造分析中的积极作用。
A total of 263 samples were collected from the Paleo-Cambrian meta-argillaceous strata in eastern Yunnan and western Sichuan. The b0 values of muscovite were measured. The results showed that metamorphism of low-temperature and high-temperature occurred during the ferry movement, And the corresponding stratigraphic development zone occurred metamorphism and the metamorphic pressure was reduced to both sides. During the first stage of Jinning movement, low-pressure metamorphism occurred during the deformation, and the second stage metamorphosed medium-high pressure metamorphism. The third stage deformation And Chengjiang exercise metamorphism. Based on this work, the active role of muscovite b_0 value in stratigraphic correlation and tectonic analysis was discussed.