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首页> 外文期刊>Geological Society of America Bulletin >A Late Miocene magmatic flare-up in West Sulawesi triggered by Banda slab rollback
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A Late Miocene magmatic flare-up in West Sulawesi triggered by Banda slab rollback

机译：西苏拉威西的后期内蒙古幻影爆发由Banda Slab Roldback触发

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Cenozoic magmatism occurs throughout West Sulawesi, Indonesia, yet its detailed evolution remains enigmatic due mainly to the scarcity of precise dating. Here, we report new whole-rock geochemical and zircon U-Pb-Hf isotopic data of plutonic/volcanic rocks and river sediments from West Sulawesi to constrain the petrogenesis and magmatic tempo. The magmatic rocks are intermediate to felsic (SiO2 = 58.1-68.0 wt%), high-K calc-alkaline to shoshonitic (K2O = 2.2-6.0 wt%), metaluminous to weakly peraluminous, and I-type in composition. Trace element concentrations and ratios (e.g., Nb/U = 1.7-4.3 and Ti/Zr < 28), along with negative zircon epsilon(Hf)(t) values (-17.0 to -0.4) and old crustal model ages (T-DM(C) = 2.1-1.1 Ga), indicate a dominant magma source region from the underlying continental crystalline basement. U-Pb dating on zircons from ten magmatic rocks yielded weighted mean Pb-206/U-238 ages of 7.2-6.1 Ma, best representing the crystallization ages of host magmas, further consistent with the prominent age peaks (7.3-6.3 Ma) defined by detrital zircons from four sedimentary samples. Our new data, combined with available results, allow the identification of a noticeable climax of magmatism (flare-up) at ca. 7-6 Ma, forming a continuous magmatic belt throughout West Sulawesi. Given the absence of contemporaneous subduction and the coincidence of incipient opening of the South Banda Basin during ca. 7.15-6.5 Ma, the Late Miocene magmatic flare-up in West Sulawesi and coeval regional extension in eastern Indonesia are attributed to a resumed episode of Banda slab rollback.
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