气候变化领域集成服务门户(CCPortal): A Late Miocene magmatic flare-up in West Sulawesi triggered by Banda slab rollback

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DOI	10.1130/B35534.1
	A Late Miocene magmatic flare-up in West Sulawesi triggered by Banda slab rollback
	Zhang X.; Tien C.-Y.; Chung S.-L.; Maulana A.; Mawaleda M.; Chu M.-F.; Lee H.-Y.
发表日期	2020
ISSN	167606
起始页码	2517
结束页码	2528
卷号	132 期号:2021-11-12
英文摘要	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 εHf(t) values (–17.0 to 0.4) and old crustal model ages (TDMC = 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 206Pb/238U 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. © 2020. All Rights Reserved.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184841
作者单位	Institute of Earth Sciences, Academia Sinica, Taipei, 11529, Taiwan; Department of Geosciences, National Taiwan University, Taipei, 10617, Taiwan; Department of Geology, Hasanuddin University, Makassar, 90245, Indonesia
推荐引用方式 GB/T 7714	Zhang X.,Tien C.-Y.,Chung S.-L.,et al. A Late Miocene magmatic flare-up in West Sulawesi triggered by Banda slab rollback[J],2020,132(2021-11-12).
APA	Zhang X..,Tien C.-Y..,Chung S.-L..,Maulana A..,Mawaleda M..,...&Lee H.-Y..(2020).A Late Miocene magmatic flare-up in West Sulawesi triggered by Banda slab rollback.Bulletin of the Geological Society of America,132(2021-11-12).
MLA	Zhang X.,et al."A Late Miocene magmatic flare-up in West Sulawesi triggered by Banda slab rollback".Bulletin of the Geological Society of America 132.2021-11-12(2020).