云开地块印支期变质-深熔作用:混合岩、片麻岩锆石U-Pb年代学和Hf同位素证据

柯贤忠,; 周岱,; 龙文国,; 王晶,; 徐德明,; 田洋,; 金巍,

doi:10.3799/dqkx.2018.574

Cited by 1 publication

(5 citation statements)

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“…The Yunkai region is a part of the Wuyi-Yunkai orogen and is located in the western Cathaysia block (Figure 1a). The metamorphosed basement in the Yunkai region is mainly composed of the Gaozhou Complex and Yunkai Group, which are unconformably overlain by weakly metamorphosed to unmetamorphosed Cambrian to Devonian strata (Figure 2a) [31,37,41,42]. The Gaozhou Complex is composed of amphibolite facies (locally granulite facies) paragneiss, schist, quartzite, marble, and migmatites, whereas the Yunkai Group is composed of lower-grade schist, slate, and phyllite as well as less common paragneiss, amphibolite, and marble [34,37].…”

Section: Regional Geologymentioning

confidence: 99%

“…The Gaozhou Complex is composed of amphibolite facies (locally granulite facies) paragneiss, schist, quartzite, marble, and migmatites, whereas the Yunkai Group is composed of lower-grade schist, slate, and phyllite as well as less common paragneiss, amphibolite, and marble [34,37]. Late Paleozoic to Cenozoic sedimentary rocks and Paleozoic to Early Mesozoic granites also occur in the Yunkai region (Figure 2a) [41][42][43].…”

Section: Regional Geologymentioning

confidence: 99%

“…Histograms (blue boxes) and probability distribution functions (red lines) for (a) detrital zircons from metasedimentary rocks of Yunkai region and (b) inherited zircons from metatexite and diatexite from this study. Data source: Yunkai Group two-mica gneiss and quartz-mica schist [36]; gneiss from Luoding [64]; paragneiss from Xiejie [29]; biotite plagioclase gneiss from Xinyi [65]; and metamorphic feldspar quartz-sandstone from Luola Village, southwest of Luoding, and biotite gneiss from the east of Xinyi [42]. Histograms (blue boxes) and probability distribution functions (red lines) for (a) detrital zircons from metasedimentary rocks of Yunkai region and (b) inherited zircons from metatexite and diatexite from this study.…”

Section: Nature Of the Protolithsmentioning

confidence: 99%

“…Recently, Wang et al (2013) [31] obtained zircon U-Pb ages from gneissic migmatites from the Longxiu-Yunlu section of the Gaozhou area, and Ke et al (2018) [42] obtained zircon U-Pb ages from leucosome in migmatites from Luoding, Guangdong, and Xinyi, Guangdong. Both studies documented metamorphic zircon growth mostly in the Early Paleozoic(~440 Ma) and minor growth in the Early Mesozoic(~230 Ma).…”

Section: Timing Of Crustal Partial Melting In Yunkai Regionmentioning

confidence: 99%

“…[31] suggested that the Early Paleozoicages represent the timing of crustal partial melting, and the Early Mesozoicages may be related to low-temperature metamorphism during Indosinian movement. Ke et al (2018) [42] interpreted both the Early Paleozoic ages and the Early Mesozoic ages as the timing of melt crystallization and suggestedthat the Yunkai region wasaffected by crustal partial melting in the Early Paleozoic and the Early Mesozoic. Figure 10.…”

Section: Timing Of Crustal Partial Melting In Yunkai Regionmentioning

confidence: 99%

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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

et al. 2019

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：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.

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