The Chu Lai granite is widespread throughout the northern Kontum massif and is an important key in understanding the evolution of the Kontum region and its vicinity. The study presents new data on geochemistry, zircon U-Pb ages, and Nd-Hf isotopes from the Chu Lai granite which allows to constrain the Paleozoic tectonic evolution of the Kontum massif. The Chu Lai granite contains alumina-rich minerals (garnet and muscovite), is depleted in Ba, Nb, Ta, Sr and Ti but enriched in Rb, Th, U and Pb. These geochemical characteristics indicate a S-type nature of the Chu Lai granite. The zircon ɛ Hf values vary between −16.7 to −1 and Hf model ages (T DM2 ) between 1.50 and 2.49 Ga as well as whole rock ɛ Nd values of −8.3 to −5.8 and Nd model ages (T DM2 ) between 1.67 and 1.89 Ga. The Hf-Nd isotope data indicate that the Chu Lai granite was derived from partial melting of Paleoproterozoic metasedimentary material. The LA-ICP-MS zircon U-Pb ages range from 445 Ma to 454 Ma, suggesting a crystallization of the Chu Lai granite during the Ordovician-Silurian period.

中文翻译：

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越南中部昆东地块朱莱花岗岩体锆石U-Pb年龄、地球化学及同位素特征

朱莱花岗岩广泛分布于昆仑山北部，是了解昆仑地区及其附近演化的重要钥匙。该研究提供了关于来自朱莱花岗岩的地球化学、锆石 U-Pb 年龄和 Nd-Hf 同位素的新数据，这些数据可以限制 Kontum 地块的古生代构造演化。朱莱花岗岩含有富含氧化铝的矿物（石榴石和白云母），贫化 Ba、Nb、Ta、Sr 和 Ti，但富含 Rb、Th、U 和 Pb。这些地球化学特征表明朱莱花岗岩具有S型性质。锆石 ɛ Hf 值在 -16.7 至 -1 之间变化，Hf 模型年龄（T DM2 ）在 1.50 至 2.49 Ga 之间以及全岩 ɛ Nd 值为 -8.3 至 -5.8 和 Nd 模型年龄（T DM2 ）介于 1.67 和1.89 加仑。Hf-Nd同位素数据表明，朱莱花岗岩来源于古元古代变沉积物质的部分熔融。LA-ICP-MS 锆石 U-Pb 年龄范围为 445 Ma 至 454 Ma，表明珠来花岗岩在奥陶纪-志留纪时期结晶。