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    A combined study of SHRIMP U-Pb dating ,trace elemnt and mineral inclusions on high-pressure metamorphic overgrowth zircon in eclogite from Qinglongshan in the Sulu terrane [查看] LIQiuli、LIShuguang、HOUZhenhui、HONGJi'an、YANGWei
    Abstract Methods recently advanced for discrimination on the genesis of metamorphic zircon,such as annalysis of mineral inclusions and trace elements,provide us powerful means to distinguish zircon overgrowth during high-pressure metamorphism.Zircons in ultrahigh-pressure eclogite from Qinglongshan in the Sulu terrane were studied by the SHRIMP U-Pb method in combining with trace element and mineral inclusion analyses. No inherited core was identified in the annalyzed zircons by means of cathodoluminescence image.The occurrence of high-pressure metamorphic mineral inclusions in zircon,such as garnet,omphacite,rutile,and the flat HREE pattern in zircon indicate that the zircon formed at high-pressure metamorphic conditions.Therefore,a weighted average U-Pb age of 227.4 ±3.5Ma obtained from such a kind of zircon is interpreted to represent the timing of peak metamorphism for the Qinglongshan eclogite
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