Late Mesozoic magmatism in the East Qinling Orogen, China and its tectonic implications

Yang, Fan; Xue, Fei; Santosh, M.; Kim, Sung Won; Shen, Zhiwei; Jia, Wenjuan; Zhang, Xuhuang

doi:10.1016/j.gsf.2019.03.003

Cited by 48 publications

(39 citation statements)

References 78 publications

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“…Therefore, late Mesozoic post-collisional granitoids were distributed in the EQOB after the Triassic collision between the NCC and YC [95][96][97]. (iii) The third model considered that the Palaeo-Pacific slab was subducted northwestward beneath East China during the late Mesozoic [4,48,98]. iv) Li et al [1] proposed a new viewpoint that the collision between the NCC and YC occurred at circa 195-160 Ma, which led to the thickening of the lower continental crust, and the subsequent post-collisional magmatism continued until circa 125 Ma.…”

Section: Geodynamic Implicationsmentioning

confidence: 99%

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Geochemistry, Zircon U-Pb Geochronology and Hf-O Isotopes of the Banzhusi Granite Porphyry from the Xiong’ershan Area, East Qinling Orogen, China: Implications for Petrogenesis and Geodynamics

et al. 2019

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The Banzhusi granite porphyry is located in the Xiong’ershan area, East Qinling orogenic belt (EQOB). This study presents an integrated whole-rock geochemistry and zircon U-Pb-Hf-O isotope analysis of the Banzhusi granite porphyry. These rocks have metaluminous, high-K alkali-calcic and shoshonitic features and show significant enrichment in light rare earth elements (LREEs) over heavy rare earth elements (HREEs) with negative Eu anomalies. These samples are also greatly enriched in Rb, Ba, K, Pb, Th and U and depleted in Nb, Ta, P and Ti, and they mostly overlap the ranges of the Taihua Group tonalite–trondhjemite–granodiorite (TTG) gneiss. Magmatic zircons from three samples of the Banzhusi granite porphyry yield U-Pb ages of 125.1 ± 0.97 Ma, 128.1 ± 1.2 Ma and 128.2 ± 1.3 Ma. The Hf-O isotope features of zircons from the three samples are very similar (δ18Ozircon = 4.84‰ to 6.51‰, εHf(t) = −26.9 to −14.4). The co-variations of geochemical and isotopic data in these granite porphyries imply that the Banzhusi granite porphyry resulted from the mixing of the partially melted Taihua Group and mantle-derived material in a post-collisional setting from 128–125 Ma.

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Section: Geodynamic Implicationsmentioning

confidence: 99%

“…In the East Qinling orogenic belt (EQOB), late Mesozoic granitoid plutons are widely distributed ( Figure 1) [1][2][3][4]. Most late Mesozoic granitoids are spatially, temporally and genetically correlated with Mo, Au and Ag-Pb-Zn mineralization in the EQOB [2,[5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Geochemistry, Zircon U-Pb Geochronology and Hf-O Isotopes of the Banzhusi Granite Porphyry from the Xiong’ershan Area, East Qinling Orogen, China: Implications for Petrogenesis and Geodynamics

et al. 2019

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“…Molybdenite Re–Os data yielded mineralizing ages of 147–144 Ma that are coeval with the zircon U–Pb age of the Yuku porphyritic granite (Guo et al, 2018; Li et al, 2015; Xue et al, 2018). Multiple isotopes indicate that the Yuku intrusion was sourced from partial melting of the lower crust with a minor mantle contribution (Bao, Wang, Zhao, Li, & Gao, 2014; Guo et al, 2018; Li et al, 2015; Xue et al, 2018; Yang et al, 2019). However, existing research has focused on geochronology, geochemistry, and mineralogy, meaning that the evolution and source of the ore‐forming fluids and the processes of Mo mineralization remain poorly understood.…”

Section: Introductionmentioning

confidence: 99%

Genesis and fluid evolution of the Yuku porphyry Mo deposit, East Qinling orogen, China

Xue

Wang

et al. 2021

Geological Journal

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The Yuku is a large porphyry Mo deposit (1.5 Mt at 0.12% Mo) in the Luanchuan ore district of the East Qinling orogen, central China. The economic Mo ore bodies occur as veins, veinlets, and disseminated ore and are developed mainly within the late Mesozoic Yuku porphyritic granite. Molybdenum mineralization is generally associated with potassic and phyllic alteration. Hydrothermal processes in the Yuku deposit are divided into four stages: (I) a quartz–K‐feldspar–biotite ± pyrite stage, (II) a quartz–molybdenite ± pyrite ± K‐feldspar ± sericite stage, (III) a quartz–polymetallic sulphide stage, and (IV) a calcite ± quartz ± fluorite ± pyrite stage. The fluid evolution during these hydrothermal stages was constrained through systematic investigation of fluid inclusions (FIs) and H−O isotopes. Four types of primary or pseudosecondary FIs were recognized in hydrothermal quartz and calcite: two‐phase liquid‐rich inclusions (L‐type), two‐phase vapour‐rich inclusions (V‐type), halite‐bearing (hypersaline) inclusions (H‐type), and three‐phase CO2‐bearing inclusions (C‐type). FIs within Stages I–IV have homogenization temperatures of 375 to >550, 297–400, 198–298, and 149–188°C, with salinities of 0.53–13.18, 0.35–40.23, 5.11–11.81, and 5.71–9.73 wt% NaCl equiv., respectively. In Stage I, coexisting vapour‐rich (V‐type) and liquid‐rich (L‐type) FIs have similar homogenization temperatures (488 to >550°C) and distinct salinities, indicating fluid boiling during the formation of quartz–K‐feldspar–biotite veins at a pressure of 550–700 bar and a lithostatic depth of 2.3–2.8 km. In Stage II, FIs in quartz were also trapped under boiling conditions, as evidenced by coexisting hypersaline H‐type (34.13–40.23 wt% NaCl equiv.) and low‐salinity V‐type (0.35–2.24 wt% NaCl equiv.) inclusions, which formed at temperatures of 309–361°C and hydrostatic depths of 1.0–2.0 km, equivalent to pressures of 100–200 bar. During Stage III, the ore‐forming fluids were cooler (198–298°C) and more dilute (5.11–11.81 wt% NaCl equiv.) due to the involvement of meteoric water, with minimum trapping pressures estimated at <100–150 bar, corresponding to a hydrostatic depth of <1.0 km. In Stage IV, temperatures decreased further to 149–188°C, with lower salinities (5.71–9.73 wt% NaCl equiv.), indicating a post‐ore fluid stage. These data suggest that the mineralizing fluids forming the Yuku Mo deposit changed from early moderate‐ to low‐salinity CO2‐rich fluids in the H2O–NaCl–CO2 system that formed at high temperature and pressure, to late H2O–NaCl low‐salinity fluids that formed at low temperature and pressure. H−O isotopic compositions indicate that the mineralizing fluids had a dominantly magmatic signature but were diluted by meteoric waters. Combining our integrated analysis of the fluid evolution and deposit geology, we propose that fluid boiling and fluid–rock interaction, including intensive potassic alteration, changed the salinity and triggered CO2 escape, leading to a decrease in fO2 and an increase in the acidity of the ore‐forming fluids...

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“…The Qinling‐Dabie orogens extend east–west for >2,000 km, located in between the North China Craton and Yangtze Craton (Li et al, 2019; Wu et al, 2009; Wu & Zheng, 2013; Yu & Chen, 2016). As a major collisional orogen in China, it formed by attempted N‐directed subduction of the Yangtze Craton during the Early Mesozoic (Hacker et al, 1998; Yang et al, 2019). The Qinling‐Dabie orogens are often referred to comprise Qinling, Tongbai, Hong'an and Dabie, which connect with the Sulu orogenic belt in the east and the Qilian‐Kunlun orogenic belt in the west (e.g., Bao, Sun, Zartman, Yao, & Gao, 2017), recording the multiperiod processes of tectonic evolution and granitoid formation (Li et al, 2019; Wu & Zheng, 2013; Yang et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…As a major collisional orogen in China, it formed by attempted N‐directed subduction of the Yangtze Craton during the Early Mesozoic (Hacker et al, 1998; Yang et al, 2019). The Qinling‐Dabie orogens are often referred to comprise Qinling, Tongbai, Hong'an and Dabie, which connect with the Sulu orogenic belt in the east and the Qilian‐Kunlun orogenic belt in the west (e.g., Bao, Sun, Zartman, Yao, & Gao, 2017), recording the multiperiod processes of tectonic evolution and granitoid formation (Li et al, 2019; Wu & Zheng, 2013; Yang et al, 2019). The Qinling‐Dabie orogens host one of the world's largest ultrahigh/high pressure (UHP‐HP) metamorphic belt, formed from the Palaeozoic to Mesozoic (Li et al, 2011; Wang et al, 2011; Wu & Zheng, 2013; Zhang et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Geochronological, geochemical, and Sr–Nd–Pb–Hf isotopes of Cretaceous gneissic granite and quartz monzonite in the Tongbai Complex: Record of lower crust thickening beneath the Tongbai orogen

Niu

Jiang

2021

Geological Journal

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A comprehensive study of zircon U–Pb ages, major and trace elements, whole‐rock Sr–Nd–Pb isotopes and zircon Hf isotopes of the gneissic granite and quartz monzonite in the Tongbai Complex is conducted in an attempt to unravel their petrogenesis and shed new light on the tectonic evolution and crust thickening process of the Tongbai orogen. Zircon U–Pb dating indicates that the emplacement of gneissic granite was early at 144.2 ± 1.3 Ma, whereas the quartz monzonite formed later at 130.2 ± 1.7 Ma. Both the gneissic granite and quartz monzonite samples share many chemical similarities, such as high Al2O3, K2O, Sr contents and low MgO contents, together with high Sr/Y, high La/Yb ratios, suggesting an C‐adakitic affinity and possibly derived from partial melting of the thickened lower crust. The later quartz monzonites may have involvement of much more proportion of mantle‐derived materials (such as the metamorphosed mafic rocks, ecologite) in the lower crust during partial melting for its petrogenesis, due to its higher MgO, Cr, Ni, and V contents than the gneissic granites. The formation of the gneissic granite and quartz monzonite records the evolution history for the lower crust thickening beneath the Tongbai orogen at the Cretaceous. Nearly all granitoids in the Tongbai orogen currently found have an emplacement age of >130 Ma and have higher Sr/Y ratios and lower MgO, Cr, Ni, and V contents with respect to the granitoids in the Dabie orogen which occurs in two stages of granitic magmatism of >130 Ma and <130 Ma. The Tongbai orogen lacks the granitoids formed by significant crust–mantle mixing that occurred in the Dabei area at <130 Ma. These results indicate that the lower crust was continuing thickening but probably not delaminated beneath the Tongbai orogeny during the Early Cretaceous.

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Late Mesozoic magmatism in the East Qinling Orogen, China and its tectonic implications

Cited by 48 publications

References 78 publications

Geochemistry, Zircon U-Pb Geochronology and Hf-O Isotopes of the Banzhusi Granite Porphyry from the Xiong’ershan Area, East Qinling Orogen, China: Implications for Petrogenesis and Geodynamics

Geochemistry, Zircon U-Pb Geochronology and Hf-O Isotopes of the Banzhusi Granite Porphyry from the Xiong’ershan Area, East Qinling Orogen, China: Implications for Petrogenesis and Geodynamics

Genesis and fluid evolution of the Yuku porphyry Mo deposit, East Qinling orogen, China

Geochronological, geochemical, and Sr–Nd–Pb–Hf isotopes of Cretaceous gneissic granite and quartz monzonite in the Tongbai Complex: Record of lower crust thickening beneath the Tongbai orogen

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