High-Mg adakitic rocks and their complementary cumulates formed by crystal fractionation of hydrous mafic magmas in a continental crustal magma chamber

Ma, Qiang; Xu, Yi–Gang; Zheng, Jian Ping; Sun, Min; Griffin, William L.; Wei, Yang; Ma, Liang; Yu, Xiaolu

doi:10.1016/j.lithos.2016.05.024

Cited by 19 publications

(6 citation statements)

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“…However, the tectonic setting of adakitic rocks in most areas is not well constrained, except for some in areas with clear tectonic settings, such as Jurassic-Cretaceous adakitic rocks in the Gangdese region that were generated in an arc setting related to subduction of the Neo-Tethys oceanic lithosphere. There are many areas containing Jurassic-Cretaceous adakitic rocks in eastern China (Zhang et al, 2001;Xu et al, 2002Xu et al, , 2006Xu et al, , 2009Wang et al, 2003Wang et al, , 2004aWang et al, , 2004bWang et al, , 2006aWang et al, , 2006bWang et al, , 2007Gao et al, 2004;Ling et al, 2009;Liu et al, 2010;He et al, 2011;Ma et al, 2012Ma et al, , 2015Ma et al, , 2016Sun et al, 2010Sun et al, , 2013Sun et al, , 2015Li et al, 2009Xu et al, 2014;Yang et al, 2014aYang et al, , 2014bDai et al, 2017), but whether these rocks were generated in an intra-continental extensional, continentalmargin arc, or back-arc extensional setting remains controversial, with inconsistent viewpoints arising concerning their genesis. Furthermore, some adakitic magmatic rocks occur in convergent plate boundaries within continental areas but were formed after paleo-plate subduction, possibly in association with thinning of thickened lithosphere caused by accretion/collisional orogenic processes (Wang et al, 2017;Zhao et al, 2017).…”

Section: Diversity Of Tectonic Setting Of Pre-cenozoic Adakitic Rocksmentioning

confidence: 99%

“…The initial materials in earlier melting experiments were generally MORB-like rocks, and further work is needed to constrain the formation of adakitic magmas by the melting of mafic rocks depleted in Nb and Ta. Furthermore, some adakitic rocks in the North China Craton (Ma et al, 2012(Ma et al, , 2015(Ma et al, , 2016 and Japan arc (Kamei et al, 2009) are suggested to have been formed by melting of the lower crust at low pressures (1.0-1.2 GPa), corresponding to depths of 30-40 km, with likely source rocks being granulites (Jiang et al, 2007) or intermediate-felsic rocks (Kamei et al, 2009). Experimental petrological data alternatively indicate that adakitic rocks in the North China Craton originated mainly from medium-and high-K metabasites (Xiong et al, 2011).…”

Section: Generation Of Adakitic Magmasmentioning

confidence: 99%

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Adakitic rocks at convergent plate boundaries: Compositions and petrogenesis

Wang

Hao

Zhang

et al. 2020

Sci. China Earth Sci.

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Adakitic rocks are intermediate-acid magmatic rocks characterized by enrichment in light rare-earth elements, depletion in heavy rare-earth elements, positive to negligible Eu and Sr anomalies, and high La/Yb and Sr/Y ratios. Cenozoic adakitic rocks generated by partial melting of subducted oceanic crust (slab) under eclogite-facies conditions (i.e., the original definition of "adakite") occur mainly in Pacific Rim volcanic arcs (intra-oceanic, continental, and continental-margin island arcs), whereas those generated by partial melting of thickened lower crust occur mainly in Tethyan Tibetan collisional orogens. In volcanic arcs, adakitic melts derived from the melting of subducted oceanic crust metasomatize the mantle wedge to form a unique rock suite comprising adakite-adakite-type high-Mg andesite-Piip-type high-Mg andesite-Nb-rich basalt-boninite. This suite differs from the basalt-andesite-dacite-rhyolite suite formed from mantle wedge metasomatized by fluids derived from subducted oceanic crust. Previously published data indicate that partial melting of mafic rocks can generate adakitic magmas under pressure, temperature, and hydrous conditions of 1.2-3.0 GPa, 800-1000°C, and 1.5-6.0 wt.% H 2 O, respectively, leaving residual minerals of garnet and rutile with little or no plagioclase. Cenozoic Au and Cu deposits occur proximally to adakitic rocks, with host rocks of some deposits actually being adakitic rocks. Adakitic rocks thus have important implications for both deep-Earth dynamics and Cu-Au mineralization/exploration. Although studies of Cenozoic adakitic rocks have made many important advances, there remain weaknesses in some important areas such as their tectonic settings, petrogenesis, magma sources, melt-mantle interactions of pre-Cenozoic adakitic rocks, and their relationship with the onset of plate tectonics and crustal growth. Future research directions are likely to involve (1) the generation of adakitic magmas by experimental simulations of partial melting of different types of rock (including intermediate-acid rocks) and magma fractional crystallization at different temperatures and pressures, (2) the relationship between magma reservoir evolution and the formation of adakitic rocks, (3) the tectonic setting and petrogenesis of pre-Cenozoic adakitic rocks and related geodynamic processes, (4) interactions between slab melts and the mantle wedge, (5) the formation of Archean adakitic tonalite-trondhjemite-granodiorite and its link to the onset of plate tectonics and crustal growth, and (6) the relationship between the formation of adakitic rocks and metal mineralization in different tectonic settings.

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Section: Diversity Of Tectonic Setting Of Pre-cenozoic Adakitic Rocksmentioning

confidence: 99%

Section: Generation Of Adakitic Magmasmentioning

confidence: 99%

Adakitic rocks at convergent plate boundaries: Compositions and petrogenesis

Wang

Hao

Zhang

et al. 2020

Sci. China Earth Sci.

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“…Consequently, Mesozoic igneous rocks with abundant granulite‐facies xenoliths are widespread (Figure ) and provide direct samples of the deep crust of the NCC. The Ningcheng and Chifeng igneous complexes were emplaced at mid‐ to lower‐crustal depths (~4.9–8.3 kbar; Ma, Xu, Zheng, Sun et al., ) in the early Mesozoic (~227 Ma). The Ningcheng complex preserves a fractionating system, consisting of cumulates and residual melts from hydrous mafic magmas, derived from an enriched mantle (Ma, Xu, Zheng, Sun et al., ).…”

Section: Geological Setting and Samplesmentioning

confidence: 99%

“…The Ningcheng and Chifeng igneous complexes were emplaced at mid‐ to lower‐crustal depths (~4.9–8.3 kbar; Ma, Xu, Zheng, Sun et al., ) in the early Mesozoic (~227 Ma). The Ningcheng complex preserves a fractionating system, consisting of cumulates and residual melts from hydrous mafic magmas, derived from an enriched mantle (Ma, Xu, Zheng, Sun et al., ). Petrogenesis of the Chifeng gabbroic diorites is not well constrained, but their geochemical compositions also suggest an origin from an enriched mantle source (She et al., ).…”

Section: Geological Setting and Samplesmentioning

confidence: 99%

Phanerozoic magma underplating and crustal growth beneath the North China Craton

Zheng

et al. 2017

Terra Nova

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Evidence for post‐Archaean crustal growth via magma underplating is largely based on U–Pb dating of zircons from granulite‐facies xenoliths. However, whether the young zircons from such xenoliths are genetically related to magma underplating or to anatexis remains controversial. The lower‐crustal xenoliths carried by igneous rocks in the Chifeng and Ningcheng (North China Craton) have low SiO2 and high MgO, indicating that parental melts of their protoliths were of unambiguous mantle origin. The xenoliths contain abundant magmatic zircons with late‐Palaeozoic ages, and have more radiogenic zircon Hf‐isotope compositions and hence younger model ages than ancient crustal magmas and the “reworking array” of the basement rocks. Our data suggest that the granulites represent episodic magmatic underplating to the lower crust of this craton in Phanerozoic time. Considering the observation that regional lowermost crust (~5 km) is mafic and characterized by Phanerozoic zircons, this work reports an example of post‐Archaean crustal growth via magma underplating.

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“…More significantly, high Sr/Y magmatic rocks and high Ba-Sr intrusions have been found in the central and eastern NCC during the Cretaceous Period (Zhang et al 2001;Qian et al 2002;Wang et al 2014;Ma et al 2016a;Wang et al 2017). These high Sr/Y magmatic rocks in the NCC usually show adakitic features that imply their special genetic and geodynamic links to a subducted oceanic slab (Wang et al 2016a), thickened or delaminated lower continental crust (Gao et al 2004;Liu et al 2012;Xu et al 2013;Yang et al 2016), fractional crystallization processes (Gao et al 2012;Ma et al 2016b), or inheritance from source materials at the normal crustal level (Qian & Hermann, 2010;Jiang et al 2011;Ma et al 2015). Meanwhile, the Cretaceous high Ba-Sr intrusions in the NCC are related to the partial melting of the enriched subcontinental lithospheric mantle and subsequent crust-mantle interaction (Wang et al 2017) or the mixing of melts from the basement and juvenile mafic lower crust (Wang et al 2014) and are possibly linked to the post-collisional lithospheric extension (Qian et al 2002) or subduction of the Palaeo-Pacific Plate (Wang et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Petrogenesis of high Ba–Sr plutons with high Sr/Y ratios in an intracontinental setting: evidence from Early Cretaceous Fushan monzonites, central North China Craton

Huang

et al. 2019

Geol. Mag.

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Geochronological, major and trace element, and Sr–Nd–Hf isotopic data are reported for the monzonitic rocks of the Fushan pluton in the Taihang Mountains, central North China Craton, in order to investigate their sources, petrogenesis and tectonic implications. Zircon U–Pb dating results reveal that the Fushan pluton was emplaced during the Early Cretaceous (∼126–124 Ma). The monzonites and quartz monzonites are mainly characterized by calc-alkaline and magnesian features and display light rare earth element (LREE) enrichment and flat heavy REE (HREE) patterns with slightly positive Eu anomalies. They have similar whole-rock initial 87Sr/86Sr ratios (0.70653–0.70819), εNd(t) values (−13.6 to −18.6) and zircon εHf(t) values (−21.8 to −17.3). The primary magma of the Fushan pluton was derived from the partial melting of a spinel-facies amphibole-bearing ancient enriched lithospheric mantle. The monzonitic rocks also have high Ba–Sr and low Y and Yb contents, with high Sr/Y and La/Yb ratios. These geochemical features of monzonitic rocks are not only inherited from the magma source but also significantly enhanced by crystal fractionation during magmatic evolution; e.g. hornblende fractionation increased the Ba–Sr concentrations and Sr/Y ratios. During the Early Cretaceous, the slab sinking and roll-back of the Palaeo-Pacific Plate could have created an ancient big mantle wedge beneath East Asia and induced a lithospheric extensional process in the central North China Craton within an intracontinental setting.

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High-Mg adakitic rocks and their complementary cumulates formed by crystal fractionation of hydrous mafic magmas in a continental crustal magma chamber

Cited by 19 publications

References 73 publications

Adakitic rocks at convergent plate boundaries: Compositions and petrogenesis

Adakitic rocks at convergent plate boundaries: Compositions and petrogenesis

Phanerozoic magma underplating and crustal growth beneath the North China Craton

Petrogenesis of high Ba–Sr plutons with high Sr/Y ratios in an intracontinental setting: evidence from Early Cretaceous Fushan monzonites, central North China Craton

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