Geochronological and geochemical constraints on genesis of the adakitic rocks in Outang, South Tan–Lu Fault Belt (Northeastern Yangtze Block)

Hu, Zilong; Yang, Xiaoyong; Duan, Liuan; Sun, Weidong

doi:10.1016/j.tecto.2014.04.004

Cited by 35 publications

(13 citation statements)

References 73 publications

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“…The melt would be distinguished by a significantly inclined distribution pattern of HREE with (Ho/Yb) N > 1.2 when the residual is dominated by garnet, otherwise, a flat distribution pattern of HREE ((Ho/Yb) N ≈ 1; Moyen, 2009) would suggest that amphibole is the major residual phase (Hu, Yang, Duan, & Sun, 2014). The average…”

Section: Sr-nd-hf Isotope Geochemistrymentioning

confidence: 99%

“…(2.87-3.1 ppm) and obvious Eu negative anomaly (δEu = 0.39-0.46), indicating that partial melting occurred in the middle and lower crust, and the residual phase is plagioclase, without garnet residue (Zhang, Jin, Li, & Wang, 2010). The (Ho/Yb) N value of monzogranites is 0.95-1.03, indicating that amphibole is also a residual phase (Hu et al, 2014). The monzogranites have a CaO/Na 2 O ratios of 0.3-0.5, indicating that the source of monzogranites is clay-poor psammitolite or greywacke (Sylvester, 1998).…”

Section: Petrogenesis Of the Monzogranitesmentioning

confidence: 99%

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Evidence for magma mixing during Triassic magmatism in West Qinling, China: Constraints from petrology, geochemistry, U–Pb zircon geochronology, and Sr–Nd–Hf isotopic of the Baguashan pluton

Dong

et al. 2021

Geological Journal

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The West Qinling Orogen, which forms the western part of the Qinling Orogenic Belt, is characterized by the voluminous distribution of Triassic granitoids. Here, we investigate the Baguashan monzogranite which hosts numerous mafic microgranular enclaves (MMEs). We present zircon U–Pb–Hf and whole‐rock geochemical as well as Sr–Nd isotopic data of the monzogranites and MMEs with a view to gain insights on the petrogenesis and geodynamic setting. Zircon LA‐ICP‐MS U–Pb dating yields ages of 219.0 ± 1.7 Ma and 219.5 ± 1.6 Ma for the MMEs, and 214.2 ± 1.3 Ma for the host monzogranite, suggesting formation from coeval magmas. The host monzogranites show high SiO2, Rb, Ba, and Th contents, but low TiO2, MgO, P2O5 values, with A/CNK of <1.1. Zircon grains from monzogranites show εHf(t) values in the range of −6.3 to +3.2 with corresponding two‐stage Hf model ages (TDM2) of 1.39–2.25 Ga. The MMEs are mostly elliptical or spherical in shape and have lower SiO2 and Th contents, but higher MgO, TiO2, and CaO, and εHf(t) values ranging from −6.1 to +5.7 with TDM2 of 1.17–2.23 Ga. The Sr–Nd isotopic data for MMEs and monzogranites show (87Sr/86Sr)i ratios ranging from 0.7059 to 0.7069 and low εNd(t) values ranging from −6.07 to −4.18, suggesting a crustal origin. Based on the relatively homogeneous Sr–Nd–Hf isotopic compositions, we suggest that the MMEs represent magma mixing, and the mafic magma injected into the felsic magma chamber was probably derived by the reworking of mafic lower crust with a contribution of juvenile materials. We propose a model involving delamination of thickened lower crust below the West Qinling Orogen after the collision between the North China Block and the South China Block in the Late Triassic. Subsequently, the lower crust was partially melted by the heat input from the upwelling asthenosphere and produced the mafic magma. Partial melting of the ancient metamorphic rocks generated the granitic magma. The interaction of mafic and felsic magmas occurred within a post‐collisional tectonic setting in the Late Triassic.

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Section: Sr-nd-hf Isotope Geochemistrymentioning

confidence: 99%

Section: Petrogenesis Of the Monzogranitesmentioning

confidence: 99%

Evidence for magma mixing during Triassic magmatism in West Qinling, China: Constraints from petrology, geochemistry, U–Pb zircon geochronology, and Sr–Nd–Hf isotopic of the Baguashan pluton

Dong

et al. 2021

Geological Journal

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“…The Feidong district is located at the junction of the NCC and SCB. Previous researchers have proposed that the source of adakites in the Feidong district might have (1) been derived from the SCB (Wang et al, 2013;Hu et al, 2014;Shang et al, 2018). 2belonged to the NCC (Xie, 2008;Niu et al, 2008Niu et al, , 2010 and (3) originated from the mixing of NCC and SCB lower crustal material (Xie et al, 2016).…”

Section: Petrogenesismentioning

confidence: 99%

“…After systematic geological and petrographic research, we analyzed zircon LA-ICP-MS U-Pb isotopic dating, zircon Hf isotopes and whole-rock geochemistry of the representative samples from the two studied intrusions. After combining with published geochemical data from the region and previous studies (Zhu et al, 2004;Hu et al, 2014;Jia et al, 2016), we further restrict the origin of the granitoid intrusions, which provide significant evidence about their petrogenesis of the abundant granitoid intrusions in Feidong district, southern Tan-Lu Fault Zone.…”

Section: Introductionmentioning

confidence: 99%

“…Most previous studies have focused on the genesis of the widelydistributed magmatic rocks, investigating the geochronology, geochemistry and petrogenesis (Niu et al, 2002(Niu et al, , 2008(Niu et al, , 2010Xie, 2008;Shang et al, 2018). Three potential magmatic sources have been proposed for explaining the igneous rocks in the Feidong district: (1) the crustal rocks of the NCC (Xie et al, 2008;Niu et al, 2002Niu et al, , 2008Niu et al, , 2010; (2) the crustal rocks of the SCB (Wang et al, 2013;Hu et al, 2014;Jia et al, 2016); (3) a mix of lower crustal components of the NCC and SCB (Xie et al, 2016). To further identify the petrogenesis in the Feidong district.…”

Section: Introductionmentioning

confidence: 99%

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Geochronology and Petrogenesis of Granitoid Intrusions in the Feidong District, Southern Tan–Lu Fault Zone, China

Zhang

Yao

et al. 2020

Acta Geologica Sinica (Eng)

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The Feidong district is located in the southern segment of the Tan–Lu fault zone that separates the South China Block (NCB) from the North China Craton (NCC). We report zircon U‐Pb geochronology and Hf isotope data, as well as whole‐rock geochemistry for Xishanyi granodiorite and Jianshan granite in the Feidong district. Zircon U‐Pb dating results show that the emplacement ages of the Xishanyi and Jianshan intrusions are 124 ± 3 Ma and 130 ± 1 Ma respectively, coeval with magmatic events linked to large‐scale lithospheric thinning in eastern China. The whole‐rock geochemistry of the Xishanyi and Jianshan intrusions demonstrate that they are peraluminous, high potassium calc‐alkaline I‐type granites with adakitic characteristics. Both intrusions underwent weak crustal assimilation during emplacement. The in situ zircon ∊Hf(t) values of the Xishanyi granodiorites range from –26.4 to –21.8, with TDM2 model ages of 2552 to 2841 Ma. The in situ zircon ∊Hf(t) values of the Jianshan granite are from –27.5 to –23.0 with TDM2 model ages of 2632 to 2904 Ma. The peak age of inherited zircon grains from the Xishanyi granodiorite and the Jianshan granite were ∼2.07 Ga and ∼1.94 Ga, respectively. After compared with the regional magmatism, we suggest that both the Xishanyi and Jianshan granitoid intrusions were derived from partial melting of the NCC lower crust.

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Understanding the genesis of ore-bearing and ore-barren adakitic rocks: insights from geochronology and geochemical analysis of the Tuncang intrusion and enclaves along the South Tan-Lu Fault

Zi,

Xiao,

Sami

et al. 2024

Int J Earth Sci (Geol Rundsch)

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Geochronological and geochemical constraints on genesis of the adakitic rocks in Outang, South Tan–Lu Fault Belt (Northeastern Yangtze Block)

Cited by 35 publications

References 73 publications

Evidence for magma mixing during Triassic magmatism in West Qinling, China: Constraints from petrology, geochemistry, U–Pb zircon geochronology, and Sr–Nd–Hf isotopic of the Baguashan pluton

Evidence for magma mixing during Triassic magmatism in West Qinling, China: Constraints from petrology, geochemistry, U–Pb zircon geochronology, and Sr–Nd–Hf isotopic of the Baguashan pluton

Geochronology and Petrogenesis of Granitoid Intrusions in the Feidong District, Southern Tan–Lu Fault Zone, China

Understanding the genesis of ore-bearing and ore-barren adakitic rocks: insights from geochronology and geochemical analysis of the Tuncang intrusion and enclaves along the South Tan-Lu Fault

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