Citation: | Xianghong Lu, Chengshi Gan, Peter A. Cawood, Xin Qian, Yuejun Wang. Oligocene High-Silica Felsic Magmatism in Juvenile Intra-Oceanic Arc Crust, North Sulawesi Arc, Indonesia. Journal of Earth Science, 2025, 36(3): 880-893. doi: 10.1007/s12583-024-0038-8 |
The North Sulawesi arc (NSUA) constitutes the northern arm of Sulawesi Island and is characterized by complex Cenozoic records of magmatism and tectonics. Zircon U-Pb geochronological and Hf-O isotopic data, whole-rock major oxides, trace elemental, and Sr-Nd-Pb isotopic data of the high-silica granites from the NSUA document their petrogenesis and tectonic setting. Zircon elemental analysis of the granitic samples shows a juvenile oceanic crust origin and the U-Pb geochronology indicates their Oligocene ages between 30.4 and 27.3 Ma. The samples have high SiO2 (75.05 wt.%–79.38 wt.%) and Na2O (4.48 wt.%–5.67 wt.%), low K2O (0.15 wt.%–1.34 wt.%) and MgO (0.07 wt.%–0.91 wt.%) contents, belonging to calc-alkaline I-type high-silica granites. They have enriched LREE and LILE, and depleted HREE and HFSE, showing significant Eu, Sr, Nb, and Ta negative anomalies. These high-silica granites have low (87Sr/86Sr)i ratios (0.704 412–0.704 592), positive
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