Partial melting of the South Qinling orogenic crust, China: Evidence from Triassic migmatites and diorites of the Foping dome

Zhang, He; Ye, Risheng; Liu, Bingxiang; Wang, Yan; Zhang, Yuan-Shuo; Siebel, Wolfgang; Chen, Fukun

doi:10.1016/j.lithos.2016.05.007

Cited by 21 publications

(11 citation statements)

References 88 publications

(101 reference statements)

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“…Characteristics including low Th/U ratios and flat HREE patterns with Eu anomalies suggest that they grew from anatectic melts (Hoskin & Schaltegger, 2003; Rubatto, 2002). Similar age groups were also reported by Zhang et al (2016) in the Foping region. They observed that, after the collision of the Yangtze and North China blocks, collapse began and subsequent upwelling of the asthenosphere led to partial melting at approximately 215 Ma.…”

Section: Discussionsupporting

confidence: 90%

“…Grey areas are determined from Zhu et al (2009) and Hu, Liu, Zhang, Deng, and Chen (2016). Other spots from the South Qinling belt use data from the following sources: Triassic granitoids (Gong, Zhu, Sun, Li, Guo, et al, 2009; Gong, Zhu, Sun, Li, & Guo, 2009; Hu, Liu, Santosh, et al, 2016; Hu, Liu, Zhang, et al, 2016; Jiang et al, 2010; Meng et al, 2013; Ping, Zheng, Zhao, Tang, & Griffin, 2013; Qin, 2010; Wang et al, 2011; Yang et al, 2011; Zhang, Wang, et al, 2009; Zhang, Liu, et al, 2009; Zhang et al, 2016; Zhu et al, 2011); Triassic migmatites (Zhang et al, 2016) [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

“…Although multiple compositions or source components should be considered with respect to the Hf model ages of the migmatites (Wu, Li, Zheng, & Gao, 2007), information about the protolith can be acquired from the Hf isotopic compositions of the zircons from the samples (Zhang et al, 2016). The ε Hf ( t ) values (−11.1 to −9.4) and T DM C (1,818–1,925 Ma) for the zircons from the leucosomes indicate that the Madao migmatites were derived from an ancient crustal source, and that the migmatites probably formed during the middle‐Late Palaeoproterozoic.…”

Section: Discussionmentioning

confidence: 99%

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Zircon U–Pb geochronology and in situ Hf isotopic compositions of the Madao migmatite: Constraints on the Mesozoic orogeny in the South Qinling belt

Wang

et al. 2020

Geological Journal

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To understand the crustal growth of the Qinling orogenic belt and the Mesozoic continental interaction between the North China and Yangtze blocks, it is critical to study the South Qinling accretionary complex belt, which is an important part of the Qinling orogen. Based on detailed zircon U–Pb geochronology and Hf isotopic compositional analyses of the Madao complex, this study presents constraints on the migmatization and tectonic evolution of the South Qinling orogenic belt during the Mesozoic. Zircons from leucosome samples of migmatites were found to have weak oscillatory zoning, and one sample yielded a weighted mean age that reflects the time at which the regional tectono‐thermal event initiated the anatexis (210–217 ± 2 Ma). The Hf isotopic compositions indicate that the Madao migmatites were derived from the ancient middle–Late Palaeoproterozoic crust. Zircons from mesosome samples of the migmatites that varied in age from the Palaeozoic to Neoproterozoic exhibited core‐rim textures with magmatic cores (256–1,329 Ma), indicating that they were derived from multiple sources with sedimentary protoliths. Of the 55 analysis spots on the overgrowth rims that yielded 206Pb/238U ages of 200–233 Ma, 40 analyses yielded a weighted age of 211.5 ± 1.0 Ma, indicating the time of anatexis due to the regional tectono‐thermal event. Combined with previously reported Mesozoic data from the South Qinling belt, these results suggest that the migmatites were probably controlled by post‐orogenic extension driven by Mesozoic orogenesis and a prolonged melting episode (from ~200 to 233 Ma). This study reinforces the interpretation that the continental crust in the South Qinling belt may have experienced complex interactions with asthenospheric mantle material during the Mesozoic.

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Section: Discussionsupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Zircon U–Pb geochronology and in situ Hf isotopic compositions of the Madao migmatite: Constraints on the Mesozoic orogeny in the South Qinling belt

Wang

et al. 2020

Geological Journal

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“…From the Early Palaeozoic, the Shangdan Ocean began to subduct down through the NQB and caused extensive basic and granitic magmatism in NQB. The subduction of the Mianlue Ocean to SQB from the Late Palaeozoic to Late Triassic formed Island arc volcanic rocks and collision granites, mostly recorded in the western part of SQB (Figure 10) (Deng, Liu, Zhang, Hu, & Li, 2016; Dong et al, 2012; Gong, Zhu, Sun, Li, Guo, & Wang, 2009; Gong, Zhu, Sun, Li, & Guo, 2009; Hu, Liu, Zhang, Deng, & Chen, 2016; Jin, Zhang, He, & Jia, 2005; Qin & Lai, 2007; Qin, Lai, & Li, 2013; Wang, Wang, & Zhang, 2013; Zhang, Ye, et al, 2016; Figure 9).…”

Section: Discussionmentioning

confidence: 99%

Sedimentary and geochronological studies on tuff levels from Triassic strata in the Nanzhao Basin, North Qinling Orogenic Belt, and their geological significance

et al. 2020

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The Ordos Basin is the second largest oil‐ and gas‐bearing sedimentary basin in China. This basin formed during the Triassic. At present, the location of the basin margins is still highly debated in the literature, especially its eastern and southern margins. The Triassic Yanchang Formation extensively outcrops in the Ordos Basin, and its distribution can provide a significant constraint on the basin extension. In this study, we focus on the measurement and correlation of the Middle–Late Triassic sedimentary strata from Nanzhao Basin, which is located to the south‐east of the present‐day Ordos Basin. The results of this study indicate that the sedimentary sequence of Triassic strata from Taizishan Formation and Taishanmiao Formation in the Nanzhao Basin is comparable with that of the Yanchang Formation in the Ordos Basin. Tuff intercalations in clastic rocks from Taizishan Formation in the Nanzhao Basin were studied with zircon chronology and Hf isotope analysis. The results show that the tuff sample has concord U–Pb age of 234.6 ± 1.5 Ma, which is considered as the boundary age between Middle and Late Triassic with a similar age in respect to that of the Yanchang Formation. The TDM2 values for the studied sample range from 1.0 to 1.4 Ga with the peak at 1.2 Ga, which is also similar to TDM2 values for tuffs encountered in the Yanchang Formation. On the other hand, the corresponding εHf(t) values of tuff in Nanzhao Basin range from −1.1 to +4.2 with an average of 1.2 and peak at 2, which are different with respect to those of the Yanchang Formation. According to the geochronological data, the tuffs in Nanzhao Basin might be mainly derived from a depleted‐mantle source from Late Meso‐Proterozoic period, and contaminated by a continental Early–Middle Meso‐Proterozoic crust. Therefore, we suggest that in Middle–Late Triassic, the southeastern margin of the Ordos Basin may have extended to Nanzhao area and the different εHf(t) values between tuffs in Nanzhao Basin and present Ordos Basin may be the result of scissor‐type collision of North China Block and South China Block during the Triassic.

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“…Based on present knowledge, the buildup of the QOB involved at least three tectonomagmatic cycles that took place during the Neoproterozoic, Paleozoic, and Mesozoic eras. Each period was associated with extensive granitic magmatism (e.g., Lu et al 1996;Wang et al 2013Wang et al , 2015Dong et al 2015b;Zhang et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Granitoid Petrogenesis and Tectonic Implications of the Late Triassic Baoji Pluton, North Qinling Orogen, China: Zircon U-Pb Ages and Geochemical and Sr-Nd-Pb-Hf Isotopic Compositions

Xue

Siebel

et al. 2018

The Journal of Geology

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A B S T R A C TThe Qinling orogenic belt in central China resulted from the final collision of the North China and South China blocks in the Triassic. Early Mesozoic granitoids are widespread in the Qinling orogen. Their genesis can provide key constraints on the tectonic evolution of this orogenic belt. The Late Triassic Baoji pluton, located in the North Qinling unit, consists of granodiorites, monzogranites, quartz monzodiorites, and K-feldspar granites. U-Pb zircon dating via the laser ablation ICP-MS technique yields ages of 217.4 5 1.4, 212.3 5 1.8, 212.6 5 1.6, and 195.1 5 2.0 Ma for granodiorites, monzogranites, quartz monzodiorites, and K-feldspar granites, respectively. The granitoids have high-K calc-alkaline, metaluminous to weakly peraluminous composition(s). Silica contents increase and Mg, Fe, Ti, Ca, and P contents decrease from quartz monzodiorites through granodiorites to monzogranites and K-feldspar granites. Combining our findings with evidence from whole-rock Sr-Nd and zircon Hf isotopes, we suggest that the granodiorites formed by magma-mixing processes involving metasomatized lithospheric mantle and Mesoproterozoic crustal material. The monzogranites record the contribution of an asthenospheric mantle source. The quartz monzodiorites were derived from a metasomatized lithospheric mantle source. Partial melting of crustal lithologies generated the K-feldspar granites. It is argued that the Baoji pluton formed in a late-collision setting.

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Partial melting of the South Qinling orogenic crust, China: Evidence from Triassic migmatites and diorites of the Foping dome

Cited by 21 publications

References 88 publications

Zircon U–Pb geochronology and in situ Hf isotopic compositions of the Madao migmatite: Constraints on the Mesozoic orogeny in the South Qinling belt

Zircon U–Pb geochronology and in situ Hf isotopic compositions of the Madao migmatite: Constraints on the Mesozoic orogeny in the South Qinling belt

Sedimentary and geochronological studies on tuff levels from Triassic strata in the Nanzhao Basin, North Qinling Orogenic Belt, and their geological significance

Granitoid Petrogenesis and Tectonic Implications of the Late Triassic Baoji Pluton, North Qinling Orogen, China: Zircon U-Pb Ages and Geochemical and Sr-Nd-Pb-Hf Isotopic Compositions

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