A Neoarchean subduction recorded by the Eastern Hebei Precambrian basement, North China Craton: Geochemical fingerprints from metavolcanic rocks of the Saheqiao-Shangying-Qinglong supracrustal belt

Guo, Rongrong; Liu, Shuwen; Xiang, Bingren; Wang, Wei

doi:10.1016/j.jseaes.2017.01.007

Cited by 32 publications

(14 citation statements)

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“…As outlined in above, several authors have used HFSE anomalies present in intrusive and/or extrusive Archaean ultramafic-mafic suites as evidence that these rocks (interpreted as cumulates [45]) were produced by subduction-related magmatism [20,26,27]. Considering the bulk-rock geochemical data alone, a similar interpretation could be offered for the Ben Strome ultramafic rocks.…”

Section: Primary Magmatic Processesmentioning

confidence: 96%

“…Although the role of modern-style plate tectonic processes (including Phanerozoic-style subduction) remains highly controversial, HFSE anomalies in extrusive/intrusive ultramafic-mafic Archaean assemblages have been widely cited as evidence for Archaean subduction-related magmatism (Figure 1; [20][21][22][23][24][25][26][27]). Such interpretations assume that, as with Phanerozoic subduction-related magmatism, the HFSE anomalies are generated by the enrichment of subduction-mobile elements (e.g., the alkali metals and LREE) relative to subduction-immobile elements (e.g., the HFSE; [4,6]).…”

Section: Implications For Geochemical Fingerprinting In Archaean Cratonsmentioning

confidence: 99%

“…Some studies that invoke a subduction-related origin for HFSE anomalies in other Archaean intrusive/extrusive ultramafic-mafic assemblages offer several (and inconsistent) lines of evidence and argument to demonstrate that the rocks have not been subject to element mobility [20,21,26,27], with LOI values lower than 3.5 wt. % and the assumed immobility of the REE during hydrothermal alteration most commonly cited.…”

Section: Implications For Geochemical Fingerprinting In Archaean Cratonsmentioning

confidence: 99%

“…Use of HFSE anomalies as supporting evidence for subduction-related magmatism has been extended to suites of mafic-ultramafic volcanic and/or plutonic rocks in several Archaean cratons over the last two decades [20][21][22][23][24][25][26][27]. Figure 1 details primitive mantle-normalised trace-element patterns for selected Archaean assemblages attributed to subduction-related magmatism in several Cratons.…”

Section: Introductionmentioning

confidence: 99%

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Assessing the Validity of Negative High Field Strength-Element Anomalies as a Proxy for Archaean Subduction: Evidence from the Ben Strome Complex, NW Scotland

et al. 2018

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The relative depletion of high field strength elements (HFSE), such as Nb, Ta and Ti, on normalised trace-element plots is a geochemical proxy routinely used to fingerprint magmatic processes linked to Phanerozoic subduction. This proxy has increasingly been applied to ultramafic-mafic units in Archaean cratons, but as these assemblages have commonly been affected by high-grade metamorphism and hydrothermal alteration/metasomatism, the likelihood of element mobility is high relative to Phanerozoic examples. To assess the validity of HFSE anomalies as a reliable proxy for Archaean subduction, we here investigate their origin in ultramafic rocks from the Ben Strome Complex, which is a 7 km2 ultramafic-mafic complex in the Lewisian Gneiss Complex of NW Scotland. Recently interpreted as a deformed layered intrusion, the Ben Strome Complex has been subject to multiple phases of high-grade metamorphism, including separate granulite- and amphibolite-facies deformation events. Additional to bulk-rock geochemistry, we present detailed petrography, and major- and trace-element mineral chemistry for 35 ultramafic samples, of which 15 display negative HFSE anomalies. Our data indicate that the magnitude of HFSE anomalies in the Ben Strome Complex are correlated with light rare earth-element (LREE) enrichment likely generated during interaction with H2O and CO2-rich hydrothermal fluids associated with amphibolitisation, rather than primary magmatic (subduction-related) processes. Consequently, we consider bulk-rock HFSE anomalies alone to be an unreliable proxy for Archaean subduction in Archaean terranes that have experienced multiple phases of high-grade metamorphism, with a comprehensive assessment of element mobility and petrography a minimum requirement prior to assigning geodynamic interpretations to bulk-rock geochemical data.

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Section: Primary Magmatic Processesmentioning

confidence: 96%

Section: Implications For Geochemical Fingerprinting In Archaean Cratonsmentioning

confidence: 99%

Section: Implications For Geochemical Fingerprinting In Archaean Cratonsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Assessing the Validity of Negative High Field Strength-Element Anomalies as a Proxy for Archaean Subduction: Evidence from the Ben Strome Complex, NW Scotland

et al. 2018

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“…It is essential to determine the mobility of elements prior to evaluating petrogenesis due to possible alterations in the chemical compositions of rocks caused by metamorphism and structural deformation (Angerer et al, ; Condie, ; Guo et al, ; Guo et al, ; Guo et al, ; Guo et al, ; Klausen et al, ). Based on a detailed assessment, Si, Fe, Mg, Ti, transition metals (Cr, Ni, and Co), REEs, Nb, Ta, and Hf in all the volcanic samples, and K and Sr only in the felsic volcanic samples are essentially immobile and could be suitable for further establishing the petrogenesis and tectonic setting.…”

Section: Discussionmentioning

confidence: 99%

A Ca. 2.8‐Ga Plume‐Induced Intraoceanic Arc System in the Eastern North China Craton

et al. 2019

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The conversion of Archean tectonic regimes from mantle plume to plate tectonic and the mechanism of subduction initiation are two crucial issues in the current Earth sciences. A typical komatiite‐tholeiite sequence consisting of ~2,850–2,800‐Ma komatiites and ~2,780–2,710‐Ma basaltic and andesitic to dacitic volcanic rocks is well preserved in the Archean Western Shandong terrane of the eastern North China Craton. These volcanic rocks were derived from the partial melting of a depleted mantle source with subsequent fractional crystallization, a metasomatized subarc mantle wedge, and a descending oceanic slab. Structural and kinematic observations suggest that the Qixingtai‐Yanlinguan‐Panchegou granite‐greenstone belt experienced ~2.85–2.80‐Ga extensional deformation (D1) by upwelling of a mantle plume and NE‐SW‐oriented shortening (D2) during ~2.78–2.71 Ga. The petrogenesis of the Mesoarchean to early Neoarchean metamorphosed volcanic rock series and regional deformation indicate that a plume‐induced self‐sustaining intraoceanic arc system with SW‐dipping subduction polarity operated ~2.8 Ga, followed by the evolution from initial to mature subduction. An increasing pull caused by the descending slab generated gravitational instability in the surrounding oceanic lithosphere and formation of a new initial subduction zone adjacent to the preexisting arc system. Similar to the process in the Western Shandong terrane, plume activity generally culminated in subduction events in many other Archean greenstone belts, revealing that plume‐arc interaction may have been a crucial mechanism for global Archean tectonic regime conversion from mantle plume to initial plate subduction in the crust of the early Earth.

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Products of an Early Cretaceous extensional mechanism in the central Great Xing'an Range: Felsic plutons in the Zhalantun area and their parental magma compositions and diagenetic processes

Xiao

Guo

et al. 2021

Geological Journal

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Late Mesozoic extensional mechanisms in the Great Xing'an Range (GXR) and relevant crust-mantle interactions are complicated, which result in widespread magmatisms with diverse parental origins and petrogenesises. In this paper, we present the lithology, whole-rock geochemistry, and zircon U-Pb-Lu-Hf isotopes for granodiorite-monzogranite rocks (GM) and their enclaves of quartz monzodiorites in the Zhalantun area, east of central GXR. Zircon U-Pb dating results reveal that both GM rocks and their enclaves of quartz monzodiorites yield a nearly identical crystallization age of $125 Ma. The GM rocks exhibit weak peraluminous and high-K calcalkaline compositions with high SiO 2 , Na 2 O + K 2 O, and Al 2 O 3 contents, and low MgO, Mg # , Fe 2 O 3T , and TiO 2 contents, which are characterized by fractionated REE patterns, relatively strong negative Eu anomalies, enrichments of LILEs (e.g., Rb, Ba, and K), and depletions of Nb, Ta, P, and Ti. The parental origins for GM samples were juvenile crustal materials, with positive zircon ε Hf (t) values of +2.5 to +12.9. The whole-rock and zircon geochemical simulations limit slightly lower GM magma crystallization temperatures (T Ti-Zrn ) of 683-824 C and relatively more oxidizing conditions (log(fO 2 ) = FMQ+7.6-FMQ-6.8), and further confine that they were probably formed by $10-35% degrees of fluid-present partial melting of lower to middle crustal materials, with fractional crystallization and/or residual mineral phases of plagioclase, amphibole, clinopyroxene, and garnet. By contrast, the enclaves of quartz monzodiorites possess lower SiO 2 and Na 2 O + K 2 O compositions, but higher MgO, Mg # , Fe 2 O 3T , and TiO 2 values, which are consistent with metaluminous-weak peraluminous and high-K calc-alkaline series. All quartz monzodiorites exhibit subparallel right-declined REE patterns, negligible to none Eu anomalies, enrichments of LILEs, and depletions of Nb, Ta, and Ti. Combined with mineral morphology and disequilibrium structures, the whole-rock geochemical and Hf isotopic simulations imply that parental magmas for quartz monzodiorites were hybrid mixtures between $50% host GM acid magmas and $50% ancient crust compositions, with a wide range of zircon ε Hf (t) of +14.0 to À7.7, slightly higher T Ti-Zrn of 710-835 C, and lower log(fO 2 ) of FMQ+8.2-FMQ-10.5. Taken together, felsic plutons in the Zhalantun area

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A Neoarchean subduction recorded by the Eastern Hebei Precambrian basement, North China Craton: Geochemical fingerprints from metavolcanic rocks of the Saheqiao-Shangying-Qinglong supracrustal belt

Cited by 32 publications

References 102 publications

Assessing the Validity of Negative High Field Strength-Element Anomalies as a Proxy for Archaean Subduction: Evidence from the Ben Strome Complex, NW Scotland

Assessing the Validity of Negative High Field Strength-Element Anomalies as a Proxy for Archaean Subduction: Evidence from the Ben Strome Complex, NW Scotland

A Ca. 2.8‐Ga Plume‐Induced Intraoceanic Arc System in the Eastern North China Craton

Products of an Early Cretaceous extensional mechanism in the central Great Xing'an Range: Felsic plutons in the Zhalantun area and their parental magma compositions and diagenetic processes

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