Petrological and geochemical constraints on the petrogenesis of granitoids in the Gonghe geothermal basin, western Qinling (China)

Zou, Fenghui; Wu, Cailai; Deng, Lihuan; Dong, Guochen; Gao, Yuanhong

doi:10.1016/j.apgeochem.2021.105176

Cited by 10 publications

(14 citation statements)

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“…Voluminous igneous rocks are widely distributed in the West Qinling orogen, especially in the westernmost tip along the Zongwulong‐Qinghainanshan Tectonic Belt (hereinafter termed “ZQTB”). The ZQTB situated in the northern margin of the Gonghe geothermal basin is embedded in the Proto‐Tethys realm (Zou, Wu, et al, 2022), and the Late Palaeozoic to Early Mesozoic rocks and Carboniferous ophiolites related to the evolution of the Palaeo‐Tethys Ocean were developed in the belt, which is a key window for deciphering the transition from Proto‐ to Palaeo‐Tethys Oceans (Fu et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…(a) Subdivision of the major tectonic units in China (modified from Zheng et al (2010)) and (b) tectonic outline and distribution map showing the magmatism of the Zongwulong‐Qinghainanshan Tectonic Belt and periphery areas around the Gonghe geothermal basin (modified after Feng et al (2018) and Zou, Wu, et al (2022)). The age data are listed in Table S1 …”

Section: Introductionmentioning

confidence: 99%

“…The Xiangpishan complex in the ZQTB is an excellent case of the intrusive suite which was emplaced above a subduction zone with coeval appearance of mafic to felsic rocks. Notably, along the ZQTB, magmatic rocks correlated to oceanic crust subduction process are widely distributed including pyroxenite, gabbro, gabbro‐diorite, diorite, quartz diorite, granodiorite, monzogranite and syenogranite (Zhang, Pei, Li, Li, Liu, Pei, Chen, Chen, & Wang, 2017; Zhang, Pei, Li, Li, Liu, Pei, Chen, Wang, & Chen, 2017; Zhang, Pei, Li, Li, Liu, Pei, & Wang, 2019; Zou, Deng, et al, 2022; Zou, Wu, et al, 2022). Although some projects have been implemented by previous workers to discuss the genesis of the ZQTB, the principal focus was on geochronology (e.g., Kong et al, 2019; Shi et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…They belong to the derivatives from the southward subduction of the Palaeo‐Zongwulong oceanic basin. Recently, Zou, Wu, et al (2022) obtained some older ages of ca. 255–254 Ma for granites in the Gonghe geothermal basin and described them as the mixture of partial melting of metabasaltic rocks and a small amount of mantle‐derived magma during the southward subduction of the Palaeo‐Zongwulong Ocean.…”

Section: Introductionmentioning

confidence: 99%

“…It has been commonly acknowledged that mafic‐ultramafic rocks are significant for constraining the mantle source of large‐scale magmatism (Sun et al, 2021). Then, MMEs could provide crucial insights for deciphering the magma mixing process, and recently they have been a focus in petrology (Alves et al, 2021; Ortiz et al, 2021; Sun, Zhang, et al, 2020; Zou, Wu, et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

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Subduction‐related mafic to felsic magmatism in the Xiangpishan concentric calc‐alkaline complex, Northeast Tibetan Plateau

Zou

Deng

et al. 2022

Geological Journal

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The Xiangpishan complex in the Zongwulong‐Qinghainanshan Tectonic Belt, Northeast (NE) Tibetan Plateau, is a composite concentric pluton consisting of a felsic core (granodiorite) surrounded by quartz diorite in the middle to diorite and minor gabbro at the margin with locally less volume of monzogranite. Many dioritic enclaves are unevenly distributed within host granitoids. We evaluate the petrogenesis of the complex by geochemical, geochronological, and Hf isotopic data in tandem with regional data in the belt. The results show that felsic rocks were emplaced during the Late Permian (ca. 262–256 Ma); whilst gabbros yielded a younger age of ca. 249 Ma. As the hybrid phase from mixing between felsic and mafic magmas, enclaves and diorites have analogous ages (ca. 257–254 Ma) to both. Zircons from gabbro and enclaves are marked by higher εHf(t) value up to +1.82; whilst granodiorites have lower εHf(t) value of −5.48, consistent with hybrid diorites possessing intermediate εHf(t) values of −3.14 to 0.34. Furthermore, the quantitative calculation from Mass Balances Modelling suggests that the mass of mafic magma (ca. 67%–79%) is involved to achieve the hybridization. Geochemically, these rocks crystallized from calc‐alkaline magma with different sources, but demonstrated consistent arc‐like signatures, as they are enriched in large‐ion lithophile elements and light rare earth element (LREE), and depleted in high‐ field‐strength elements and heavy rare earth element (HREE). Besides, they present negative Nb–Ta anomalies together with significant P and Ti troughs. Finally, an evolutional model has been proposed that the asthenosphere‐lithosphere interaction played an important role during the emplacement of the complex, where the limited volumes of mantle‐derived melt act as the suppliers of heat and mass (mainly volatile components) to induce partial melting of the juvenile mafic lower crust and mixed (or mingled) with the produced crust‐derived magma during the oceanic subduction, which led to the generation of diorites as well as mafic microgranular enclaves.

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Section: Introductionmentioning

confidence: 99%