Fluid-fluxed melting of orogenic crust in the South Qinling Belt, central China: Implications from migmatites of the Foping dome

Zhang, He; Cheng, H. S.; Wu, Guozhong; Huang, Xiguang; He, Song; Chen, Fukun

doi:10.1016/j.jseaes.2020.104606

Cited by 2 publications

(1 citation statement)

References 90 publications

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“…Diagram of element variation. (Kongling group metamorphic rock data comes from Qiu et al (2016); Yudongzi group metamorphic rocks data comes from Chen et al (2019); Foping group data comes from Zhang et al (2021). Note: unit of major elements: wt%, unit of trace elements: ppm.…”

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confidence: 99%

Petrology and geochemical characteristics of amphibolite facies rocks in Xunyangba area, South Qinling Orogen, Central China

Kong

Wang²,

Yao³

et al. 2023

Front. Earth Sci.

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As a tectonic block of the Qinling Orogenic Belt, Central China, the South Qinling Orogen is generally believed to have had a tight affinity with the Yangtze Block during the Precambrian. Knowledge on the South Qinling Orogen is important to constrain the tectonic evolution of the northern margin of the Yangtze Block basement. Previous studies mainly focused on the east segment of the South Qinling Orogen. This paper presented petrological, geochronological, and geochemical studies on the amphibolite-facies rocks newly discovered in the middle section of the South Qinling Orogen. Geochemical studies indicate that the protolith of these amphibolites is calc-alkaline island arc basalt, which was formed during the reconstruction of the Paleo-Middle Archean crust on the northern margin of the Yangtze Block 2,362 ± 100 Ma ago (equivalent to metamorphic rocks of the Yudongzi group). Later, these arc basalts experienced amphibolite-facies metamorphism at 1,500–1,800 Ma, which is consistent with the metamorphism identified in the Yangtze Block, confirming the association of the South Qinling Orogen with the Yangtze Block basement. Subsequently, these amphibolite-facies rocks further experienced three stages of metamorphism at c. 800 Ma, 440 Ma, and 200 Ma in the context of the northward subduction of the Yangtze Block.

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Section: Data Availability Statementmentioning

confidence: 99%

Petrology and geochemical characteristics of amphibolite facies rocks in Xunyangba area, South Qinling Orogen, Central China

Kong

Wang²,

Yao³

et al. 2023

Front. Earth Sci.

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Late Mesozoic volcanism in the southern Xiong'er Mountains, eastern Qinling: Partial melting of the subducted Qinling crust underneath North China

Zhang

et al. 2022

GSA Bulletin

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Volcanism along the continental margins is a powerful tool with which to probe the orogenic processes and crustal components underlying orogenic belts. In this study, we report the zircon ages and geochemical compositions of volcanic rocks exposed in the Luanchuan area, along the southern margin of the North China block. In previous studies, these volcanic rocks were reported to be products of Paleoproterozoic (ca. 1.75 Ga) volcanism related to rifting in the Xiong’er Mountains. Our zircon age data reveal that most volcanic rocks contain late Mesozoic zircon grains of magmatic origin, suggesting that Late Jurassic to Early Cretaceous (ca. 150−120 Ma) volcanism must have occurred in the southern Xiong’er Mountains, coeval with emplacement of large granitoid plutons along the southern margin of the North China block. These late Mesozoic volcanic rocks mainly consist of trachyandesite, andesite, dacite, and rhyolite. They vary in their major-element compositions but are relatively uniform in their normalized patterns of trace and rare earth elements and have consistently enriched Nd isotopic compositions. Numerous inherited and/or xenocrystic zircon grains of mostly Paleoproterozoic and occasionally Neoproterozoic to early Mesozoic ages were found in all of the volcanic rocks, indicating complex magma sources and/or diverse crustal rocks overlying the magma chambers. The Paleoproterozoic zircon grains originated from the Paleoproterozoic volcanic and basement rocks in the southern North China block. Notably, some volcanic rocks contained early Mesozoic, early Paleozoic, and Neoproterozoic zircon grains of both metamorphic and magmatic origin that indicate derivation from the North and South Qinling blocks, which recorded thermo-tectonic events during the closure of the Shangdan and Mianlue oceans in the early Paleozoic and early Mesozoic. Therefore, we propose that these late Mesozoic volcanic rocks originated from partial melting of crustal rocks and are composed partly of the subducted basement of the Qinling orogenic belt underneath the southern Xiong’er Mountains due to asthenospheric upwelling in an extensional setting.

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Fluid-fluxed melting of orogenic crust in the South Qinling Belt, central China: Implications from migmatites of the Foping dome

Cited by 2 publications

References 90 publications

Petrology and geochemical characteristics of amphibolite facies rocks in Xunyangba area, South Qinling Orogen, Central China

Petrology and geochemical characteristics of amphibolite facies rocks in Xunyangba area, South Qinling Orogen, Central China

Late Mesozoic volcanism in the southern Xiong'er Mountains, eastern Qinling: Partial melting of the subducted Qinling crust underneath North China

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