Fig. 3: Zircon geochronology and trace elements. | Communications Earth & Environment

Fig. 3: Zircon geochronology and trace elements.

From: Magmatic flare-up causes crustal thickening at the transition from subduction to continental collision

Fig. 3

Time-stamped zircon trace element variation for A Melt-poor residual eclogite (sample DKE-374) and B Plagioclase-rich leucosome (sample DKE-371) associated with the eclogitic residue. Reported ages for the sample DKE-374 are average 206Pb/238U ages. For the high-Yb group (zircon cores) the average 206Pb/238U ages for the oldest (N = 3) concordant zircons are considered the minimun age for the protolith. Age for the metamorphic zircon grains from leucosome of sample DKE-371 is a concordia age (N = 11). C Zircon trace element variation from zircon cores to rims as a function of 206Pb/238U ages for sample DKE-374. The light blue envelope represents zircon trace element for the leucosome-rich sample (DKE-371). Upper left inset illustrates the combined decrease in Yb and negative Eu anomaly, indicating zircon growth during metamorphism with increasing garnet modal abundance for samples DKE-374 and DKE-371.

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