181 / 352
165
convoluted zonings at
c.
489 Ma.
176
Lu/
177
Hf,
176
Yb/
177
Hf,
176
Hf/
177
Hf
(t)
and Th/U
ratios do not show any variation related with U–
Pb age variations (Figs. 48b, 49a,b & Appx. 4).
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Fig. 47.
CL (cathodoluminescence) images of representative zircons from the studied sample. Laser ablation pits for U–Pb
analyses (red line circles) have 23
μ
m diameters. Laser ablation pits for Lu–Hf analyses (green line circles) have 26 and 40
μ
m diameters. White numbers are the reference number of the analysis, red numbers are the U–Pb age and its 2
σ
error (Ma)
and the green numbers are the
H
Hf values for the U–Pb age.
7.3. ECLOGITES