Rheological transitions in progressive melting of rock and their geological constraints from the Fuhu metatexite-diatexite profile in Guangdong Province, SE China

Chen, Zhen; Liu, Yongjiang; Chen, Guoneng; Peng, Zhenwei

doi:10.1016/j.jseaes.2017.02.009

Cited by 6 publications

(9 citation statements)

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“…We measured leucosome proportions in each layer of the metatexite-diatexite profile and linked this with the possible rheological transitions controlled by melt fraction (Table S3). Based on the relationship between aggregate strength and melt fraction of the partially melted protolith at Fuhuling [92] and our structural analysis of leucosome networks, we now propose a conceptual model for the variable morphologies observed in the Fuhuling migmatites (Figure 12a-i). This is essential for establishing a link between rheological transitions and crustal partial melting in the Yunkai region during Early Paleozoic Wuyi-Yunkai orogeny.…”

Section: Minerals 2019 9 X For Peer Reviewmentioning

confidence: 89%

“…The first is known as the melt connectivity transition (MCT) [86][87][88][89], which is generally thought to occur at 7 vol.% melt in a static system [88]. A second threshold is known as the solid-to-liquid transition (SLT) [88], which is similar to the rheologically critical melt percentage (RCMP), and is characterized by the less-pronounced aggregate strength drop at a melt fraction around 40 vol.% [90][91][92].…”

Section: Rheology Of the Yunkai Region During The Wuyi-yunkai Orogenymentioning

confidence: 99%

“…Fuhuling migmatites have variable proportions of leucosome, which is inferred to approximate the variable amount of anatectic melt that was present during orogenesis. Chen et al (2017) [92] investigated the relationship between aggregate strength versus leucosome fraction in the Fuhuling migmatites and proposed that, in addition to MCT and SLT, there is a third rheological threshold termed the framework-melting transition (FMT). The FMT is characterized by a sharp decrease of aggregate strength at melt fractions of~21 vol.% and can be interpreted as a transition of the solid framework from compact to fused.…”

Section: Rheology Of the Yunkai Region During The Wuyi-yunkai Orogenymentioning

confidence: 99%

“…To assess the influence of the aggregate strength and melt fraction of the partially melted protolith on the structures of Fuhuling migmatite in the Yunkai region, we quantified leucosome proportions along the metatexite-diatexite transect (Figure 11). The methodology of our approach is the same as described in detail by Zhang et al (2017) [38] and Chen et al (2017) [92]. We measured leucosome proportions in each layer of the metatexite-diatexite profile and linked this with the possible rheological transitions controlled by melt fraction (Table S3).…”

Section: Rheology Of the Yunkai Region During The Wuyi-yunkai Orogenymentioning

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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Section: Minerals 2019 9 X For Peer Reviewmentioning

confidence: 89%

Section: Rheology Of the Yunkai Region During The Wuyi-yunkai Orogenymentioning

confidence: 99%

Section: Rheology Of the Yunkai Region During The Wuyi-yunkai Orogenymentioning

confidence: 99%

Section: Rheology Of the Yunkai Region During The Wuyi-yunkai Orogenymentioning

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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“…However, these mafic-ultramafic rocks primarily occurred in the western Cathaysia on the northwest side of the Zhenghe-Dapu and Gaoyao-Huilai regional faults. They rarely occurred in the coastal area of SCB, that is, the eastern Cathaysia, in spite of numerous metamorphic rocks, including various migmatites distributed in the area (Chen & Grapes, 2007;Chen, Liu, Chen, & Peng, 2017;Granitoid Research Group of the Naning Project, 1989;Shu, Wang, Cawood, Santosh, & Xu, 2015;Sun, 2006;Zhou, Sun, Shen, Shu, & Niu, 2006).…”

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confidence: 99%

A preliminary study of the siliceous and femic rock blocks in the Neoproterozoic diatexitic granite at Fuhu Hill in southwestern Guangdong, China

et al. 2021

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The crystalline basement of Cathaysia Block is commonly believed to have formed before the Middle Neoproterozoic; however, the basement rock has seldom been reported in the eastern Cathaysia. Recently, numerous siliceous and femic rock blocks distributed in the diatexitic host granite were observed on the rocky beach of Fuhu Hill in the southwestern Guangdong, China. The results of geological and geochemical investigations of these rock blocks revealed that the protolith of siliceous rock blocks (SRBs) was marine silicalite deposited in a pelagic environment between the ridge-proximal and continental margin, and the femic rock blocks (FRBs) geochemically corresponded to trachybasalt and monzogabbro, pertaining to OIB/E-MORB types in the Ce/Y-Zr/Nb and Zr/Y/Nb systems. 206 Pb/ 238 U ages of 995 and 1,002 Ma were obtained from zircon U-Pb dating of the FRBs. The host rocks of the SRBs and FRBs were mainly diatexitic granite that was intruded and sometimes hosted by massive granite. The zircon 206 Pb/ 238 U age gained from the diatexitic granite was 991 Ma whereas that from the massive granite was 239 Ma. It may be concluded that SRBs and FRBs were derived from a spilite-keratophyre formation formed during 1,005-995 Ma and disintegrated around 991 Ma due to crustal anataxis. These SRBs, FRBs, and their diatexitic host granite blocks might have been brought up to the shallow crust by granitic magma in the Indosinian period or due to fault activity in the late stage. Moreover, the southwest part of the eastern Cathaysia possessed a similar basement as the western Cathaysia.

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Deformation and rheology of the Asian continent

Liu

Neubauer

2017

Journal of Asian Earth Sciences

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Rheological transitions in progressive melting of rock and their geological constraints from the Fuhu metatexite-diatexite profile in Guangdong Province, SE China

Cited by 6 publications

References 41 publications

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

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

A preliminary study of the siliceous and femic rock blocks in the Neoproterozoic diatexitic granite at Fuhu Hill in southwestern Guangdong, China

Deformation and rheology of the Asian continent

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