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Late Triassic post-collisional slab break-off along the Ailaoshan suture: insights from OIB-like amphibolites and associated felsic rocks

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Abstract

What dynamic processes the South China-Indochina collision had gone through is still a pending problem. Our recent investigations identified a Late Triassic gabbroic intrusion in Mengdong village and several granitic plutons near Wana village, Yunnan province (SW China). Both have underwent strong metamorphism and been altered to amphibolite and granitic gneiss, respectively. We carried out SIMS and LA-ICPMS zircon U–Pb dating for the amphibolites and granitic gneisses, respectively. Dating results yield weighted mean 206Pb/238U ages of 221.5 ± 5.3 Ma for the amphibolites and 224.0 ± 1.8 and 235.4 ± 0.6 Ma for the granitic gneisses. The amphibolite samples have low Mg# (41.7–42.8), high TiO2 (~3.7 wt%) and Na2O (Na2O/K2O = 1.89–2.68) contents and depleted Sr–Nd isotopic compositions [(87Sr/86Sr)i = 0.707647 and ε Nd(t) = +1.17]. They exhibit OIB-like REE patterns and spidergrams, with strongly enriched LREE contents, insignificant Eu anomalies (Eu* = 0.99–1.03) and moderate negative Sr anomalies (Sr* = 0.46–0.56). The protolith gabbro of the Mengdong amphibolites is derived from low-degree partial melting of a homogeneous OIB-type mantle source in the garnet stability field and experienced significant fractionation of olivine, clinopyroxene and plagioclase during magma evolution. The Wana samples are strongly peraluminous (A/CNK > 1.1) and K-enriched (K2O/Na2O = 2.93–3.63). They show enriched Sr–Nd isotopic compositions with (87Sr/86Sr)i = 0.718589–0.719754 and ε Nd(t) = −11.34 to −10.92. The Wana plutons are typical S-type granite and product of the dehydration melting of meta-sedimentary rocks. We summarized Late Triassic age data in the literature along the South China-Indochina suture zone and recognized a significant Late Triassic magmatic flare-up. In combination with previous studies on the Late Triassic HP–UHP metamorphic rocks, we proposed that during the Late Triassic the South China-Indochina suture zone had transformed into post-collisional setting, and accompanied slab break-off triggered the OIB-type asthenospheric mantle upwelling and provided the heat source for the Late Triassic magmatic flare-up.

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Acknowledgments

We would like to express our gratitude to Dr. T.-P. Peng and X.-P. Xia for their help during fieldwork, geochemical and zircon U–Pb analyses. Financial supports from National Science Foundation of China (41190073, 41030352), National Basic Research Program of China (2014CB440901), China Postdoctoral Science Foundation (41090280) and “the Fundamental Research Funds for the Central Universities to SYSU” are gratefully acknowledged.

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  1. Yuejun Wang

    Present address: School of Earth Science and Geological Engineering, Sun Yat-Sen University, Guangzhou, 510275, China

Authors and Affiliations

  1. School of Earth Science and Geological Engineering, Sun Yat-Sen University, Guangzhou, 510275, China

    Huichuan Liu

  2. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, 100101, China

    Xiaofei Guo, Weiming Fan & Jingjing Song

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  1. Huichuan Liu
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  2. Yuejun Wang
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Correspondence to Yuejun Wang.

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Liu, H., Wang, Y., Guo, X. et al. Late Triassic post-collisional slab break-off along the Ailaoshan suture: insights from OIB-like amphibolites and associated felsic rocks. Int J Earth Sci (Geol Rundsch) 106, 1359–1373 (2017). https://doi.org/10.1007/s00531-016-1373-5

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