In-situ U–Pb isotope and REE analyses for zircons from ultrahigh temperature metamorphic rocks in the Kannak Complex, Kontum Massif, Vietnam.

Bui Thi Sinh Vuong, Osanai Yasuhito, Nakano Nobuhiko, Adachi Tatsuro, Kitano Ippei

doi:10.15017/2547988

Zircons from two pelitic granulites （corundum–spinel-bearing garnet–cordierite–sillimanite and garnet–spinel–cordierite granulites） of the western Kannak Complex, Kontum Massif, Vietnam were analyzed for in-situ U–Pb isotope age dating and rare earth elements（ REE） chemistry along with textural context by laser ablation inductively coupled plasma mass spectrometry. As the result, the correlation between zircon occurrence, its internal textural, U–Pb age and REE characteristics confirmed the ultrahigh temperature event during Permian–Triassic （230-260 Ma） and linked the age with the metamorphic process. The timing of peak metamorphism related with continental collision was constrained between ca. 250 – 260 Ma by the evidences of zircon inclusions in garnet from garnet–spinel–cordierite granulite and nearby cordierite–spinel symplectite from corundum–spinel-bearing garnet–cordierite–sillimanite granulite. The REE patterns of these zircons display the enrichment in the heavy REE （HREE） with gentle and steep positive slope, respectively. The youngest age group of ca. 230 Ma is yielded from the zircon contacting or included in secondary minerals such as chlorite or muscovite with the distinguishably depleted HREE, which corresponds to the timing of later intense hydration event during exhumation.

In-situ U–Pb isotope and REE analyses for zircons from ultrahigh temperature metamorphic rocks in the Kannak Complex, Kontum Massif, Vietnam.

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