Abstract
4~ laserprobe dating allows direct dating of discrete deformational and kinematic events, as long as; regional thermal conditions are well constrained, deformational fabrics and kinematics are carefully characterized, and the fabric forming mineral used for dating can be related to the right fabric and the right metamorphic assemblage. Considering the metamorphic stability field and the closure temperature ranges for the main K-bearing minerals that can be used for 4~ age dating (Fig. 1), it is shown that two temperature windows exist at which white mica and hornblende respectively may (re-)crystallize below their closure temperature ranges, which is of interest as discrete fabric forming events might be directly datable. In this study 4~ laserprobe dating has been applied to white mica bearing fabrics in greenschist and blueschist facies settings, because: Geodynamisch Onderzoeksinstituut, Faculteit Aardwetenschappen, Universiteit Utrecht
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