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Partial Melting and Crustal Deformation during the Early Paleozoic Wuyi–Yunkai Orogeny: Insights from Zircon U-Pb Geochronology and Structural Analysis of the Fuhuling Migmatites in the Yunkai Region, South China

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School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China
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School of Marine Sciences, Sun Yat-sen University, Guangzhou 510006, China
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Department of Earth and Environmental Sciences, University of Waterloo, ON N2L 3G1, Canada
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Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 510760, China
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China Aerospace Academy of Architectural Design and Research Co., Beijing 100162, China
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State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
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Geophysical Exploration Center, China Earthquake Administration, Zhengzhou 450002, China
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(10), 621; https://doi.org/10.3390/min9100621
Received: 28 August 2019 / Revised: 26 September 2019 / Accepted: 5 October 2019 / Published: 9 October 2019
Migmatites record crucial information about the rheology and tectonothermal evolutionof the deep crust during orogenesis. In the Wuyi–Yunkai orogen in South China, migmatites at Fuhuling record Early Paleozoic high temperatures and associated partial melting. However, the absolute timing and implications for the rheology of the deep crust during orogenesis are poorly constrained. In this contribution, we used spatial analysis of migmatitic leucosomes, structural analysis, and U-Pb geochronology of zircon to elucidate the absolute timing of crustal partial melting, the degree of partial melting, and the role of partial melting on the rheology of the crust during the Wuyi–Yunkai orogeny. Partial melting of the Fuhuling migmatites occurred at c. 440 Ma during Early Paleozoic Wuyi–Yunkai orogenesis. Subsequent lower temperature metamorphism associated with Indosinian movement that caused minor zircon recrystallization was temporally associated with the crystallization of nearby biotite monzogranites, but it did not influence the morphology of the Fuhuling migmatites. The migmatites preserve a morphological transition from metatexite to diatexite with an increasing proportion of leucosome. This transition preserves different structural characteristics that represent the response of the solid framework and melt network to variable melt fractions during partial melting. The large proportion of in situ or in source leucosome in the Fuhuling migmatites suggests that it was a melt-rich crustal horizon during orogenesis, and that a substantial proportion of anatectic melt was retained in the deep crust. The rheological transition documented in the Fuhuling migmatites was caused by changes in the melt fraction, and it is an analogue for the rheological transition characteristics of melt-rich crustal horizons in the Yunkai region during Early Paleozoic Wuyi–Yunkai orogenesis and subsequent orogenic collapse. View Full-Text
Keywords: metatexite; diatexite; crustal partial melting; rheological transitions; Wuyi–Yunkai orogeny metatexite; diatexite; crustal partial melting; rheological transitions; Wuyi–Yunkai orogeny
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Zhang, J.; Liu, W.; Yakymchuk, C.; Sa, R.; Zeng, Z.; Ding, R.; Tang, G.; Liu, H.; Xu, Q.; Wang, Y. Partial Melting and Crustal Deformation during the Early Paleozoic Wuyi–Yunkai Orogeny: Insights from Zircon U-Pb Geochronology and Structural Analysis of the Fuhuling Migmatites in the Yunkai Region, South China. Minerals 2019, 9, 621.

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