Mineralogical and geochemical constraints on contribution of magma mixing and fractional crystallization to high-Mg adakite-like diorites in eastern Dabie orogen, East China

Zhang, Chao; Ma, Changqian; Holtz, François; Koepke, Jürgen; Wolff, Paul Eric; Berndt, Jasper

doi:10.1016/j.lithos.2013.04.011

Cited by 45 publications

(15 citation statements)

References 128 publications

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“…They exhibit high initial 87 Sr/ 86 Sr ratios and negative e Nd (t) values, and different O isotope compositions compared to normal mantle values. In addition, their element and isotope compositions display high heterogeneities [e.g., Dai et al, 2011;Zhang et al, 2013;Zhao et al, 2013]. These features were interpreted to indicate incorporation of the deeply subducted continental crust into their mantle source [e.g., Jahn et al, 1999;Fan et al, 2004;Wang et al, 2005;Zhao et al, 2005Zhao et al, , 2011Huang et al, 2007;Dai et al, 2011Dai et al, , 2012.…”

Section: Introductionmentioning

confidence: 99%

Source and magma mixing processes in continental subduction factory: Geochemical evidence from postcollisional mafic igneous rocks in the Dabie orogen

Dai

Zhao

Zheng

et al. 2015

Geochem. Geophys. Geosyst.

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Postcollisional mafic igneous rocks commonly exhibit petrological and geochemical heterogeneities, but their origin still remains enigmatic. While source mixing is substantial due to the crustmantle interaction during continental collision, magma mixing is also significant during postcollisional magmatism. The two processes are illustrated by Early Cretaceous mafic igneous rocks in the Dabie orogen. These mafic rocks show arc-like trace element distribution patterns and enriched Sr-Nd-Pb isotope compositions, indicating their origination from enriched mantle sources. They have variable whole-rock e Nd (t) values of 217.6 to 25.2 and zircon e Hf (t) values of 229.0 to 27.7, pointing to source heterogeneities. Such whole-rock geochemical features are interpreted by the source mixing through melt-peridotite reaction in the continental subduction channel. Clinopyroxene and plagioclase megacrystals show complex textural and compositional variations, recording three stages of mineral crystallization during magma evolution. Cpx-1 core has low Cr and Ni but high Ba, Rb and K, indicating its crystallization from a mafic melt (Melt 1) derived from partial melting of hydrous peridotite rich in phlogopite. Cpx-1 mantle and Cpx-2 exhibit significantly high Cr, Ni and Al 2 O 3 but low Rb and Ba, suggesting their crystallization from pyroxenite-derived mafic melt (Melt 2). Whole-rock initial 87 Sr/ 86 Sr ratios of gabbro lies between those of Pl-1core (crystallized from Melt 1) and Pl-1 mantle and Pl-2 core (crystallized from Melt 2), providing isotopic evidence for magma mixing between Melt 1 and Melt 2. Taken together, a heterogeneously enriched mantle source would be generated by the source mixing due to reaction of the overlying subcontinental lithospheric mantle wedge peridotite with felsic melts derived from partial melting of different rocks of the deeply subducted continental crust during the continental collision. The magma mixing would occur between mafic melts that were derived from partial melting of the heterogeneously metasomatic mantle domains in the postcollisional stage. As a consequence, the source and magma mixing processes in the continental subduction factory are responsible for the significant variations in the whole-rock and mineral geochemistries of postcollisional mafic igneous rocks.

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Section: Introductionmentioning

confidence: 99%

Source and magma mixing processes in continental subduction factory: Geochemical evidence from postcollisional mafic igneous rocks in the Dabie orogen

Dai

Zhao

Zheng

et al. 2015

Geochem. Geophys. Geosyst.

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“…Gu et al, 2013; age data from this study, Huang et al, 2008;Wang et al, 2007b;Xu et al, 2004;Zi et al, 2008;Liu et al, 2010b;Xu et al, 2012;Zhang et al, 2013;Gu et al, 2013).…”

Section: Geodynamic Modelmentioning

confidence: 64%

Early Cretaceous continental delamination in the Yangtze Block: Evidence from high-Mg adakitic intrusions along the Tanlu fault, central Eastern China

Jia

Santosh

et al. 2016

Journal of Asian Earth Sciences

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“…Several models have been suggested for the genesis of adakitic magma, including (1) partial melting of subducted oceanic slab (Defant & Drummond, ; Ling, Wang, Ding, Zhou, & Sun, ; Rapp, Shimizu, Norman, & Applegate, ; W. D. Sun et al, ; Y. H. Wang et al, ; Zhu et al, ); (2) partial melting of thickened lower crust (Z. H. Zhao, Xiong, Wang, Bai, & Qiao, ); (3) partial melting of subducted continental crust (Ling et al, ; J. F. Xu, Shinjo, Defant, Wang, & Rapp, ); (4) assimilation and fractional crystallization of parental basaltic magma (Macpherson, Dreher, & Thirlwall, ; Richards, ); and (5) mixing of basaltic and felsic magmas (J. F. Qin, Lai, Diwu, Ju, & Li, ; Y. H. Wang et al, ; C. Zhang et al, ).…”

Section: Discussionmentioning

confidence: 99%

Petrogenesis of Middle Devonian diorite at the Xierqu Fe–Cu deposit in the Kalatag district, eastern Tianshan, NW China

et al. 2019

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Xierqu is a skarn Fe–Cu deposit associated with porphyritic diorite, in the Kalatag district of eastern Tianshan, China. The diorite yields a sensitive high‐resolution ion microprobe U–Pb zircon date of 391 ± 3 Ma interpreted as its age of emplacement. Major element geochemistry shows that the diorite is a calc‐alkaline assaying 16.7–19 wt.% of Al2O3, with Mg# values of 56.8–67.1, and Al2O3/(CaO + Na2O + K2O) (A/CNK) values of 0.55–0.94. Trace element characteristics of the diorite show that it is enriched in Ba, K, and Sr and depleted in Nb, Ta, and Ti, with a positive Eu (1.18–1.44) anomaly and high Sr/Y and La/Yb ratios. Sr–Nd isotopic analyses yielded positive εNd(t) values ranging from 7.1 to 9.8 with low initial 87Sr/86Sr ratios of 0.703806 to 0.703856. These geochemical and isotopic characteristics indicate that the diorite is adakite‐like emplaced in an island‐arc setting and resulted from partial melting of subducted oceanic crust in a mantle wedge during the Devonian.

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Mineralogical and geochemical constraints on contribution of magma mixing and fractional crystallization to high-Mg adakite-like diorites in eastern Dabie orogen, East China

Cited by 45 publications

References 128 publications

Source and magma mixing processes in continental subduction factory: Geochemical evidence from postcollisional mafic igneous rocks in the Dabie orogen

Source and magma mixing processes in continental subduction factory: Geochemical evidence from postcollisional mafic igneous rocks in the Dabie orogen

Early Cretaceous continental delamination in the Yangtze Block: Evidence from high-Mg adakitic intrusions along the Tanlu fault, central Eastern China

Petrogenesis of Middle Devonian diorite at the Xierqu Fe–Cu deposit in the Kalatag district, eastern Tianshan, NW China

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