Origins of igneous microgranular enclaves in granites: the example of Central Victoria, Australia

Clemens, J. D.; Elburg, Marlina; Harris, Chris

doi:10.1007/s00410-017-1409-2

Cited by 49 publications

(19 citation statements)

References 102 publications

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“…Furthermore, the similar formation ages and identical zircon Hf isotopes (Figure 8) between the Shuanghu MMEs and host granodiorites also eliminate the xenolith origin (W. Xu et al, 2021; Zhou et al, 2020). The magma mixing model is the most common and prevailing mechanism to explain the origin of MMEs in granitoids (Barbarin, 2005; Clemens et al, 2017; H. J. Xu, Ma, & Zhang, 2012; H. J. Xu, Song, Ye, Zhang, & Wang, 2012; Yang et al, 2005; Yang, Wu, Chung, Wilde, & Chu, 2004). Linear arrays in elemental variation diagrams between end‐members and mixtures (Keller, Schoene, Barboni, Samperton, & Husson, 2015) and disequilibrium textures and mineral compositions in mixtures are expected from magma mingling (Vernon, 1984; Y. Zhu et al, 2019c).…”

Section: Discussionmentioning

confidence: 99%

“…MMEs are common in intermediate to felsic granitic intrusions and volcanic rocks. They generally preserve important information on the nature of source rocks, emplacement mechanism and magma evolution (Barbarin & Didier, 1992; Clemens, Elburg, & Harris, 2017; Donaire, Pascual, Pin, & Duthou, 2005). The Late Triassic magmatic rocks from the Longmu Co‐Shuanghu suture zone (LSSZ), central of Qiangtang (Figure 1a,b), contains numerous MMEs.…”

Section: Introductionmentioning

confidence: 99%

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Petrogenesis and geodynamic significance of Late Triassic mafic microgranular enclaves and its host granodiorite in the Shuanghu area, central Qiangtang

Xie

Huang

et al. 2022

Geological Journal

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The genesis of Late Triassic granitoids in the central Qiangtang is significant for deducing the evolution of the Palaeo‐Tethys Ocean in Qiangtang Block. Herein, we present a comprehensive study of zircon U–Pb ages, whole‐rock geochemistry and zircon Lu–Hf isotopes for the mafic microgranular enclaves (MMEs) and host granodiorites from the Shuanghu area, in order to evaluate their petrogenesis and geodynamic implications. New zircon U–Pb dating show identical formation ages for host granodiorites (207.1 ± 2.2 Ma and 206.6 ± 3.8 Ma) and MMEs (205.4 ± 2.9 Ma and 209.2 ± 2.2 Ma). The Shuanghu granodiorites contain amphibole and biotite and are characterized by moderate SiO2 (64.74–66.40 wt%) and K2O contents (2.48–3.62 wt%) as well as low A/CNK (0.69–1.00), indicating I‐type granite affinity. Its enriched zircon Hf isotopes (εHf(t) = −12.04 to −5.09) indicate that they were derived from the ancient mafic lower crust. The MMEs have a similar mineral assemblage, emplacement ages, trace elemental and zircon Hf isotopic compositions with the host granodiorites, indicating the cognate origin. These MMEs represent autoliths captured by latter ascending host magmas in the middle‐upper magma chamber. The highly variable Mg# (37–53), Cr (16.9–190 ppm) and Ni (5.71–67.2 ppm) in the Shuanghu MMEs and host granodiorites indicate that the mantle‐derived magma provided not only the heat but also the mafic components. In combining with previous studies, we suggest that the Shuanghu granodiorites and MMEs were formed in the post‐collision stage, which were caused by the asthenosphere upwelling related to the slab breakoff.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Petrogenesis and geodynamic significance of Late Triassic mafic microgranular enclaves and its host granodiorite in the Shuanghu area, central Qiangtang

Xie

Huang

et al. 2022

Geological Journal

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“…Igneous microgranular enclaves are widespread in granitic rocks and point to magma mixing processes [56]. However, enclaves are common in granitic rocks, and their presence should not be used to infer any particular tectonic setting [57] specifically. Nevertheless, there are considerable models proposed to decipher the origins of MEs, for instance, whether they are restites of source rocks [13,14], autoliths [58,59], or they were formed by the mantle-crust magma mixing [12,60].…”

Section: Origin Of the Mesmentioning

confidence: 99%

Petrogenesis of the Microgranular Enclaves and Their Host Granites from the Xitian Intrusion in South China: Implications for Geodynamic Setting and Mineralization

Liu

Hou

et al. 2020

Minerals

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The South China Block had experienced a significant tectonic transition during the Mesozoic in response to the subduction of the Paleo- and the Pacific Ocean. Large-scale granitic intrusions with massive mineralization are widespread in South China, and their tectonic settings are not defined. The Xitian intrusion is ideal for probing the geodynamic setting and mineralization in South China because they comprise an abundance of microgranular enclaves (MEs) and diverse types of granite associated with mineralization. Age determined by zircon U-Pb dating suggests that the MEs and their host granites are coeval within error, of ca. 152 Ma. The MEs have a similar initial Hf-O isotopic composition as host granites, and the rapid cooling mineral textures indicate that they are autoliths. Geochemical data show that the host granites are high-K, calc-alkaline, and transitional from metaluminous to peraluminous, slightly enriched in light rare earth elements (LREEs) relative to heavy rare earth elements (HREEs), with obvious negative Eu anomalies, belonging to I-type. The Nb/Ta and Zr/Hf ratios indicate the volatile penetrates the magmatic-forming process, and the fluid with abundant volatile could extract metal element effectively from the mantle.

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“…However, the textural, mineralogical, chemical and isotopic characteristics of these enclaves suggest that they only mingled with their host magmas at emplacement levels, with variable degrees of hybridization of the enclave magma by the granite (see e.g. Clemens et al 2017). Such enclaves most likely represent small volumes of high-temperature hybrid magmas that were formed by mixing between mantle-derived and crustal melts, near the depths of the granitic magma sources (Clemens and Bezuidenhout 2014;Clemens et al 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Clemens et al 2017). Such enclaves most likely represent small volumes of high-temperature hybrid magmas that were formed by mixing between mantle-derived and crustal melts, near the depths of the granitic magma sources (Clemens and Bezuidenhout 2014;Clemens et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Age, duration and mineral markers of magma interactions in the deep crust: an example from the Pyrenees

Vielzeuf

Paquette

Clemens

et al. 2021

Contrib Mineral Petrol

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We report in-situ dating, and Hf and O isotope studies of zircon crystals, together with electron microprobe imaging of garnet crystals from a migmatitic diorite containing noritic globules, in the Ursuya massif (French Pyrenees). Diorite zircon crystals have old inherited cores and 295 ± 2 Ma rims, while those in the norite are homogeneous, with lower U and Pb, and higher Th and Th/U ratios than in the diorite zircon rims. The 295 Ma dates represent the crystallisation age of hybridised crustal melts. Norite zircon crystals display similar ages (298 ± 3 Ma) than the diorite zircon rims, interpreted as the crystallisation age of the norite. Hf isotopes indicate that the noritic magmas were already crustally contaminated prior to intrusion at their present locations. The contrasting behaviours of slow-and fast-diffusing species within garnet (e.g. P vs Ca) caused sharp P and diffuse Ca core-rim transitions.2 Modelling of garnet Ca diffusion profiles suggests a duration of 2 ± 1 Myr for the magma interactions in the deep crust. Integrated with granite dating, these data provide insights into pulsations in the regional thermal event that concluded the Hercynian orogenic cycle.

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Origins of igneous microgranular enclaves in granites: the example of Central Victoria, Australia

Cited by 49 publications

References 102 publications

Petrogenesis and geodynamic significance of Late Triassic mafic microgranular enclaves and its host granodiorite in the Shuanghu area, central Qiangtang

Petrogenesis and geodynamic significance of Late Triassic mafic microgranular enclaves and its host granodiorite in the Shuanghu area, central Qiangtang

Petrogenesis of the Microgranular Enclaves and Their Host Granites from the Xitian Intrusion in South China: Implications for Geodynamic Setting and Mineralization

Age, duration and mineral markers of magma interactions in the deep crust: an example from the Pyrenees

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