Differential exhumation and cooling history of North Qaidam UHP metamorphic rocks, NW China: Constraints from zircon and rutile thermometry and U-Pb geochronology
We analyze zircon and rutile U-Pb ages and trace elements using LA-ICP-MS and SIMS of eclogites from the North Qaidam ultra-high-pressure metamorphic belt in NW China. Zr-in-rutile and Ti-in-zircon thermometries give consistent peak metamorphic temperatures for two fresh eclogite samples. Zircon and rutile U-Pb dating from the Yuka eclogite yielded ages of 430.2±3.7Ma and 407±16Ma respectively. Zircons from North Dulan eclogite record two distinct eclogite-facies metamorphic events at 446.6±4.1...[Show more]
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