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The combined use of the Rb-Sr and 40 Ar- 39 Ar laser probe methods allows confirmation of the existence of excess argon in phengites from eclogites from the Sesia zone (Western Alps) despite systematic 40 Ar- 39 Ar plateau ages. 40 Ar- 39 Ar phengite ages from two different areas show integrated age spreads between 65.4...
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