New constraints on the tectono-magmatic evolution of the central Gangdese belt from Late Cretaceous magmatic suite in southern Tibet

Ye, Meng; Santosh, M.; Mao, Guangzhou; Lin, Peijun; Liu, Jinqing; Ren, Peijia

doi:10.1016/j.gr.2019.10.014

Cited by 26 publications

(13 citation statements)

References 105 publications

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“…We thus propose that the granodiorites were derived from partial melting of juvenile crust with participation of ancient crustal material. These features are consistent with the Late Cretaceous to Early Paleogene volcanic and intrusive rocks that are considered to have been derived from juvenile continental crust (Ji et al, 2009;Jiang et al, 2014;Chen et al, 2015;Meng et al, 2020). Ji et al (2014) also reported that there are obvious contributions of a juvenile component in the magma generation of the GB during the Late Cretaceous to Early Paleogene.…”

Section: Petrogenesis Of the Monzodiorites And Granodiorites In The E...supporting

confidence: 77%

Petrogenesis and Tectonic Implications of the Latest Cretaceous Intrusive Rocks from the Eastern Gangdese Belt, Southeast Tibet

Chen

Zhang

et al. 2022

Acta Geologica Sinica (Eng)

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The latest Cretaceous magmatic activity in the eastern segment of the Lhasa terrane provides important insights for tracking the magma source and geodynamic setting of the eastern Gangdese batholith, eastward of eastern Himalayan Syntaxis. Detailed petrological, geochemical and geochronological studies of the intrusive rocks (monzodiorites and granodiorites) of the eastern Gangdese batholith are presented with monzodiorites and granodiorites giving zircon U–Pb crystallization dates of 70–66 Ma and 71–66 Ma with εHf(t) values of –4.8 to +6.2 and –1.9 to +5.3, respectively. These rocks are metaluminous to weakly peraluminous I‐type granites showing geochemically arc‐related features of enrichment in LREEs and some LILEs, e.g., Rb, Th, and U, and depletion in HREEs and some HFSEs, e.g., Nb, Ta, and Ti. The rocks are interpreted to be derived from partial melting of mantle material and juvenile crust, respectively, which are proposed to be triggered by Neo‐Tethyan slab rollback during northward subduction, with both experiencing ancient crustal contamination. The studied intrusive rocks formed in a transitional geodynamic setting caused by Neo‐Tethyan oceanic flat subduction to slab rollback beneath the eastern Gangdese belt during the latest Cretaceous.

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Section: Petrogenesis Of the Monzodiorites And Granodiorites In The E...supporting

confidence: 77%

Petrogenesis and Tectonic Implications of the Latest Cretaceous Intrusive Rocks from the Eastern Gangdese Belt, Southeast Tibet

Chen

Zhang

et al. 2022

Acta Geologica Sinica (Eng)

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“…4. Wen et al (2008Wen et al ( , 2008a, Zhang et al (2010Zhang et al ( , 2014Zhang et al ( , 2019, Chu et al (2011), Tafti et al (2011), Zhu et al (2011), Jiang et al (2012, 2014, Ma et al (2013Ma et al ( , 2013aMa et al ( , 2013bMa et al ( , 2015, Ji et al (2014), Zheng et al (2014), Chen et al (2015a, Xu et al (2015Xu et al ( , 2019, Ye et al (2015), Gao et al (2017), Dai et al (2018), Wu et al (2018), Liu et al (2019), Meng et al (2019Meng et al ( , 2020…”

Section: Discussionmentioning

confidence: 99%

“…The southern Lhasa terrane experienced a magmatic peak in the late Cretaceous (100-80 Ma) during which a large volume of island arc magmatic rocks was emplaced, including gabbro, diabase, diorite and granite (Ji et al, 2009;Meng et al, 2019Meng et al, , 2020Tang et al, 2019). The early portion of the flare-up period was dominated by basic and intermediate magma with a limited range of isotopic compositions, but the period from 95-90 Ma is marked by a wide range of SiO 2 contents (from ultramafic cumulates to high-SiO 2 granites) and extremely diverse isotopic compositions (Fig.…”

Section: Geodynamic Implicationsmentioning

confidence: 99%

“…The widespread late Cretaceous magmatic rocks exposed in southern Tibet offer a unique view into geodynamic and geochemical interactions between the mantle and the crust in a subduction environment (Zhu et al, 2009;Meng et al, 2020;Zhang et al, 2020). However, the petrogenesis of these rocks was complex and, as a result, geodynamic models for their origin remain highly debated.…”

Section: Introductionmentioning

confidence: 99%

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Late Cretaceous adakitic and A-type granitoids in Chanang, southern Tibet: Implications for Neo-Tethyan slab rollback

Wang

Zhao

et al. 2021

Gondwana Research

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“…This magmatic belt is known as the Gangdese magmatic belt or the Gangdese batholith, comprised of subduction and collision-related plutons and equivalent volcanic rocks now exhumed as a tilted magmatic orogen (Cao et al, 2020). Existing geochronological data identify four distinct episodes of magmatism in the Gangdese belt at 240-150, 100-80, 65-40, and 30-13 Ma (Ji et al, 2009;Ma et al, 2018;Zhu et al, 2019;Ma et al, 2020b;Meng et al, 2020). The 240-150 and 100-80 Ma magmatism is ascribed to be associated with the subduction of the Neotethyan oceanic lithosphere (Wen et al, 2008;Ji et al, 2009;Xie and Tang, 2021).…”

Section: Geological Settingmentioning

confidence: 99%

Mesoscopic and Microscopic Magmatic Structures in the Quxu Batholith of the Gangdese Belt, Southern Tibet: Implications for Multiple Hybridization Processes

Zhao

Cao

et al. 2021

Front. Earth Sci.

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The Quxu batholith of the Gangdese magmatic belt, southern Tibet, comprises predominantly Early Eocene calc-alkaline granitoids that feature a variety of types of magmatic microgranular enclaves and dikes. Previous studies have demonstrated that magma mixing played a crucial role in the formation of the Quxu batholith. However, the specific processes responsible for this mixing/hybridization have not been identified. The magmatic microgranular enclaves and dikes preserve a record of this magma mixing, and are therefore an excellent source of information about the processes involved. In this study, mesoscopic and microscopic magmatic structures have been investigated, in combination with analyses of mineral textures and chemical compositions. Texturally, most of the enclaves are microporphyritic, with large crystals such as clinopyroxene, hornblende, and plagioclase in a groundmass of hornblende, plagioclase, and biotite. Two types of enclave swarms can be distinguished: polygenic and monogenic swarms. Composite dikes are observed, and represent an intermediate stage between undisturbed mafic dike and dike-like monogenic enclave swarms. Our results reveal three distinct stages of magma mixing in the Quxu batholith, occurring at depth, during ascent and emplacement, and after emplacement, respectively. At depth, thorough and/or partial mixing occurred between mantle-derived mafic and crust-derived felsic magmas to produce hybrid magma. The mafic magma was generated from the primitive mantle, whereas the felsic end-member was produced by partial melting of the preexisting juvenile crust. Many types of enclaves and host granitoids are thus cogenetic, because all are hybrid products produced by the mixing of the two contrasting magmas in different proportions. In the second stage, segregation and differentiation of the hybrid magma led to the formation of the host granitoids as well as various types of magmatic microgranular enclaves. At this stage, mingling and/or local mixing happened during ascent and emplacement. In the final stage, mafic or hybrid magma was injected into early fractures in the crystallizing and cooling pluton to form dikes. Some dikes remained undisturbed, whereas others experienced local mingling and mixing to form composite dikes and eventually disturbed dike-like monogenic enclave swarms. In summary, our study demonstrates the coupling between magmatic texture and composition in an open-system batholith and highlights the potential of magmatic structures for understanding the magma mixing process.

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New constraints on the tectono-magmatic evolution of the central Gangdese belt from Late Cretaceous magmatic suite in southern Tibet

Cited by 26 publications

References 105 publications

Petrogenesis and Tectonic Implications of the Latest Cretaceous Intrusive Rocks from the Eastern Gangdese Belt, Southeast Tibet

Petrogenesis and Tectonic Implications of the Latest Cretaceous Intrusive Rocks from the Eastern Gangdese Belt, Southeast Tibet

Late Cretaceous adakitic and A-type granitoids in Chanang, southern Tibet: Implications for Neo-Tethyan slab rollback

Mesoscopic and Microscopic Magmatic Structures in the Quxu Batholith of the Gangdese Belt, Southern Tibet: Implications for Multiple Hybridization Processes

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