A combined study of SHRIMP U-Pb dating, trace element and mineral inclusions on high-pressure metamorphic overgrowth zircon in eclogite from Qinglongshan in the Sulu terrane

作者：Li QL; Li SG^*; Hou ZH; Hong J; Yang W

来源：Chinese Science Bulletin, 2005, 50(5): 459-465.

DOI：10.1360/03wd0442

• SHRIMP dating
• trace element
• mineral inclusions
• peak metamorphic time

Methods recently advanced for discrimination on the genesis of metamorphic zircon, such as analysis 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 analyzed zircons by means of cathodoluminescence images. 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 ± 3.5 Ma obtained from such a kind of zircon is interpreted to represent the timing of peak metamorphism for the Qinglongshan eclogite.

• 出版日期2005-3
• 单位中国科学院地质与地球物理研究所兰州油气资源研究中心; 中国科学技术大学; 中国科学院地质与地球物理研究所