Abstract
Phengites in ecologites of the Dabieshan region can be divided into three generations: primary phengite formed during ecologite-facies prograde metamorphism ( Phe1), phengite formed during the late stage of eclogite-facies retrograde metamorphism (Phe2) and phengite formed during amphibolite-to greenschist-facies diaphthoresis ( Phe3). Electron microprobe analyses show that the Si and Fe2+ + Mg contents of Phel are unexpectedly lower than those of Phe3. Therefore, much caution should be exercised while using the Si content of phengite to estimate the pressure of a retrograde process.
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