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东秦岭松树沟一带秦岭杂岩中长英质高压麻粒岩的特征矿物组合为石榴石+蓝晶石+微纹碱性长石+石英+金红石。它的形成条件为800～900℃和1.3～1.6GPa,并遭受了600～650℃和0.8～1.0 GPa以及500～600℃和0.3～0.6Gpa两个阶段退变质作用的改造,分别形成珍珠云母+多硅白云母+斜长石(Pl_Ⅰ)+石英和矽线石+黑云母+斜长石(Pl_Ⅱ)+微斜长石+石英两期退变质矿物组合,共同构成一个早期降温降压和后期再降压降温的两阶段顺时针演化的P-T轨迹。
The characteristic mineral assemblage of the Middle and Middle English high pressure granulites in the Qinling Complex in the Songhuagou area of East Qinling is garnet + kyanite + fine grain alkaline feldspar + quartz + rutile. Its forming conditions are 800-900 ℃ and 1.3-1.6GPa, and it has been transformed into degenerated metamorphism in two stages of 600 ~ 650 ℃ and 0.8 ~ 1.0 GPa, and 500 ~ 600 ℃ and 0.3 ~ 0.6Gpa to form pearl mica + Siliceous mica + plagioclase (Pl_Ⅰ) + quartz and sillimanite + biotite + plagioclase (Pl_Ⅱ) + plagioclase + quartz two degenerated metamorphic mineral assemblages, together constitute an early cooling step-down and Two-stage clockwise PT PT trajectory followed by decompression and cooling.