Generation of andesite through partial melting of basaltic metasomatites in the mantle wedge: Insight from quantitative study of Andean andesites

Chen, Long; Zheng, Yong‐Fei; Xu, Zheng; Zhao, Zi‐Fu

doi:10.1016/j.gsf.2020.12.005

Cited by 26 publications

(14 citation statements)

References 256 publications

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“…The general low Mg# (= 100*MgO/(MgO + FeO) = 19.9-41.4) and higher alkali contents of the studied samples compared to other andesites from continental arcs (Conway et al 2020a, b) possibly result from either fractionation processes of the magma during ascent or, according to a recent interpretation, from source mixing and partial melting of metasomatic domains in the mantle wedge (Chen and Zhao 2017;Chen et al 2021). Such metasomatic domains might result from the reaction of mantle wedge peridotite with hydrous felsic melts derived from the subducted slab.…”

Section: Magma Differentiationmentioning

confidence: 67%

“…From the magma differentiation trends and overall geochemical compositions of the studied rocks, two alternative schematic tectonic models can be proposed (Fig. S3 in the ESM): (1) "Basalt-input model" supporting the assumption that assimilation and fractional crystallization (AFC) processes account for the observed chemical compositions and (2) the SARSH model (Chen and Zhao 2017;Chen et al 2021) interpreted as subduction, anatexis, reaction, storage and heating, which favors the hypothesis of source mixing and partial melting of metasomatic domains in the mantle wedge. The former is supported by bulk compositions ranging mainly from basaltic to andesitic and the evidence of fractional crystallization trends and assimilation that led to enrichment and variable concentrations of melt-mobile incompatible trace elements.…”

Section: Magma Differentiationmentioning

confidence: 99%

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Geochemical and zircon U-Pb geochronological constraints on late mesozoic Paleo-Pacific subduction-related volcanism in southern Vietnam

et al. 2022

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Late Mesozoic volcanic rocks comprising mainly basalt and basaltic-andesite to dacite occur in south-central Vietnam (Dalat zone) and to a lesser extent in southwestern Vietnam (Bay Nui area). Mineral and whole-rock chemistry indicate a calc-alkaline affinity for samples in the Dalat zone and a high-K calc-alkaline to shoshonitic affinity for rocks in the Bay Nui area. Mineral characteristics and variation diagrams of selected elements suggest that fractional crystallization dominated during magma differentiation. The Bay Nui volcanic rocks generally are more enriched in potassium and LILEs (large-ion lithophile elements) than volcanic rocks from the Dalat zone, which may indicate a more evolved nature or crustal assimilation. The similar chemical characteristics and eruption/emplacement age range of volcanic and plutonic rocks (ca. 90–110 Ma) of equal silica concentration indicate that the magma feeding the volcanic eruptions had the same source as that of the plutonic rocks. The observed mineral and whole-rock compositions with enrichment in LILEs, depletion in HFSEs (high field strength elements), and noticeably negative Nb, Ta, and Ti anomalies are characteristic for arc signatures. Zircon U-Pb geochronological data for the volcanic rocks indicate an age range of 95–105 Ma for the eruption. These geochemical and geochronological data link this Late Mesozoic volcanism with continental arc magmatism driven by the subduction of the Paleo-Pacific beneath eastern Indochina. Zircon xenocrysts with a likely magmatic origin cluster around 350 Ma and 250 Ma, indicating two earlier magmatic events most likely related to the subduction of the Paleo-Tethys beneath western Indochina and the subsequent Indosinian orogeny.

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Section: Magma Differentiationmentioning

confidence: 67%

Section: Magma Differentiationmentioning

confidence: 99%

Geochemical and zircon U-Pb geochronological constraints on late mesozoic Paleo-Pacific subduction-related volcanism in southern Vietnam

et al. 2022

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“…Data were filtered to exclude rocks that were obviously cumulate (e.g., samples with >20 wt.% MgO), incorrectly entered, transferred or normalized (e.g., lavas with >80 wt.% SiO 2 and Mg# >50, lavas with >70 wt.% SiO 2 and Mg# >60, lavas with <10 wt.% MgO and Mg# >80, and lavas with <5 wt.% MgO and Mg# > 75) or obviously altered (e.g., the sample that is labelled as moderately or significantly altered in the database or with LOI >20 wt.%). These filtrate criteria are similar to those of Kelemen et al (2003) and Chen et al (2021). Furthermore, the samples that have certain trace element compositions or trace element ratios with several orders of magnitude different from the other data, and therefore present as outliers in certain diagrams, were also eliminated.…”

Section: Methods and Data Compilationmentioning

confidence: 99%

Geochemical comparison between oceanic and continental arc volcanic rocks: Insights to arc magmatism

et al. 2023

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Compositional differences between continental and oceanic arc volcanic rocks have long been recognized; however, our understanding of them is incomplete. This study presents a comprehensive geochemical comparison, including major, trace and Sr–Nd–Pb isotope compositions, between global continental and oceanic arc volcanic rocks. Our data compilation reveals that volcanic rocks from a single oceanic arc occupy basaltic to basaltic–andesitic average lithochemical compositions, except for volcanic rocks from the Lesser Antilles arc, which occupies an andesitic average lithochemical composition, similar to the bulk composition of volcanic rocks from single continental arcs. The composition of the average continental arc volcanic rocks, the average Lesser Antilles arc volcanic rocks and the average oceanic arc volcanic rocks are different in many ways, which span the entire compositional range from basalts to rhyolites, and are reflected in major, trace element and Sr–Nd–Pb isotope compositions. Qualitative geochemical analyses and semi‐quantitative modelling suggest that the compositional differences in mafic arc volcanic rocks can be accounted for by differences in source mixing between mantle wedge peridotite and slab‐derived crustal components. Slab melts‐peridotite source mixing governs most of the lithochemical features of the continental arc and the Lesser Antilles arc mafic volcanic rocks, which is especially true for Sr–Nd–Pb isotopes. On the other hand, such source mixing occurred to a lesser extent in the petrogenesis of oceanic arc mafic volcanic rocks. Magma evolution processes such as fractional crystallization may further modify the lithochemical composition of the arc volcanic rocks, especially the felsic ones, but this is not the governing factor.

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“…The AOC‐derived fluid, sediment‐derived melt, SF, and diapiric solid mélange are all important agents for transporting crustal materials from the slab to the mantle wedge source of arc magmas. Nevertheless, the relative roles of these agents, and whether there is a dominant agent, have been greatly debated (e.g., L. Chen et al., 2021; Codillo et al., 2018; Cruz‐Uribe et al., 2018; H. Li et al., 2022; Nielsen & Marschall, 2017; Parolari et al., 2021; Turner & Langmuir, 2022).…”

Section: Implications On Processes Of Subduction Zone Crustal Recyclingmentioning

confidence: 99%

Fe–Mg Isotopes Trace the Mechanism of Crustal Recycling and Arc Magmatic Processes in the Neo‐Tethys Subduction Zone

Chen,

Li,

Deng

et al. 2023

JGR Solid Earth

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There has been intense debate on the mechanism of crustal recycling in subduction zones, and Fe–Mg isotopes may provide new constraints on this issue. This study reports Fe–Mg isotope data for mafic plutonic rocks from the eastern and central Gangdese arc, along with their associated trench sediments in southern Tibet. The δ26Mg values of the eastern Gangdese arc rocks show negative correlations with (87Sr/86Sr)i and (206Pb/204Pb)i values, but positive correlations with εNd(t) and εHf(t) values. Conversely, the δ56Fe values of the eastern Gangdese arc rocks show positive correlations with (87Sr/86Sr)i and (206Pb/204Pb)i values, but negative correlations with εNd(t) and εHf(t) values. The Mg and Fe isotopic compositions of the central Gangdese arc rocks are comparable with those of the eastern ones, but they do not correlate with Sr–Pb–Nd–Hf isotopic compositions. Notably, the Fe–Mg isotopic compositions of most arc rocks fall between those of local trench sediments and the mantle wedge. Combined qualitative analyses and quantitative simulations suggest that: (1) the Fe–Mg isotope variations observed in the eastern Gangdese arc rocks highlight the important role of source mixing between sediment‐derived melts and peridotite, whereas (2) the Fe–Mg isotope variations observed in the central Gangdese arc rocks reflect the superposition of carbonated serpentinite‐derived Mg‐rich fluids‐peridotite source mixing and source melting. The strong correlations between Fe–Mg isotope ratios and traditional geochemical tracers provide further evidence for the recycling of crustal materials in subduction zones via various types of slab‐derived fluids and melts.

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Generation of andesite through partial melting of basaltic metasomatites in the mantle wedge: Insight from quantitative study of Andean andesites

Cited by 26 publications

References 256 publications

Geochemical and zircon U-Pb geochronological constraints on late mesozoic Paleo-Pacific subduction-related volcanism in southern Vietnam

Geochemical and zircon U-Pb geochronological constraints on late mesozoic Paleo-Pacific subduction-related volcanism in southern Vietnam

Geochemical comparison between oceanic and continental arc volcanic rocks: Insights to arc magmatism

Fe–Mg Isotopes Trace the Mechanism of Crustal Recycling and Arc Magmatic Processes in the Neo‐Tethys Subduction Zone

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