Silurian magmatism on the eastern margin of the Erguna Block, NE China: Evolution of the northern Great Xing'an Range

Feng, Zhiqiang; Liu, Yongjiang; Wu, Peng; Jin, Wei; Liu, Weimin; Wen, Qiang; Zhao, Yue; Jian-ping, Zhou

doi:10.1016/j.gr.2018.04.011

Cited by 28 publications

(20 citation statements)

References 86 publications

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“…Two‐stage Hf model ages of representative early Palaeozoic volcanic rocks in the XAC are mainly Neoproterozoic, indicating that the basement is composed of crustal rocks that were newly accreted during the Neoproterozoic (Liu et al, 2019). Feng et al (a) identified several Neoproterozoic to late Palaeozoic ophiolitic mélanges and island arc magmatic rocks, as well as early Palaeozoic subduction accretionary complexes, within the XAC, thereby confirming that this unit is an accretionary complex rather than a continental block.…”

Section: Geological Background Samples and Petrographymentioning

confidence: 96%

Late Devonian to early Carboniferous magmatism in the western Songliao–Xilinhot block, Northeast China: Implications for eastward subduction of the Nenjiang oceanic lithosphere

Liu

Qin

et al. 2020

Geological Journal

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The timing and direction of narrowing and closure of the Nenjiang Ocean (NJO) by plate subduction remain poorly constrained. This paper presents geochemical, isotopic, and geochronological results for Late Devonian to early Carboniferous intrusive rocks in the western Songliao–Xilinhot block to constrain the evolution of subduction in the NJO region. The Late Devonian syenogranites and monzogranites formed at 366–360 Ma and are classified as A‐type granites. The wide range of εHf(t) values (−17.62 to +8.13) and TDM2 ages (789–2,208 Ma) of the syenogranites indicate that the primary magma was derived from partial melting of multiple sources, including both young accreted continental crust and old lower crust rocks. The early Carboniferous granitic mylonites formed at 342 Ma and are I‐type granites. Their high SiO2 and K2O contents, εHf(t) values of +6.61 to +9.86, and young TDM2 ages of 675 to 857 Ma suggest a preexisting juvenile crustal material source region. The early Carboniferous hornblende gabbros formed at 334 Ma and are part of an appinite suite. The gabbros have low silica and high MgO contents, E‐MORB‐like trace element features, εHf(t) values of +1.34 to +8.97, and young TDM1 ages of 595 to 902 Ma, which together suggest a primitive magmatic source including juvenile MORB and/or enriched lithospheric mantle. Magmatism in the western Songliao–Xilinhot block formed a late Palaeozoic magmatic arc stretching along the eastern Hegenshan–Heihe suture. A new model of the evolution of subduction in the NJO region and associated coeval magmatic events is proposed that includes westward subduction of NJO oceanic crust during the Late Devonian at 366–360 Ma, bidirectional subduction during the early Carboniferous at ~342 Ma, and break‐off/delamination of the eastward subducting slab at ~334 Ma.

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Section: Geological Background Samples and Petrographymentioning

confidence: 96%

Late Devonian to early Carboniferous magmatism in the western Songliao–Xilinhot block, Northeast China: Implications for eastward subduction of the Nenjiang oceanic lithosphere

Liu

Qin

et al. 2020

Geological Journal

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“…For example, collision‐related assemblage between the Kokchetav microcontinent and the Stepnyak island arc in North Kazakhstan, which was indicated by the Late Silurian–Early Devonian alkali‐rich granitoids that directly intrude into the collision zone, and post‐collisional magmatism of adjacent areas (Dobretsov, Buslov, Zhimulev, Travin, & Zayachkovsky, 2006; Shatagin, Degtyarev, Golubevt, Astrakhantsev, & Kuznetsov, 2001); Middle–Late Silurian collage between the BASJ arc and BC arc in the central, with end‐Silurian–Early Devonian post‐collisional A‐type granites and associated mafic to felsic intrusions (Chen et al, 2015); moreover, collision of the Central Tianshan and the Kazakhstan–Yili–North Tianshan before the Late Silurian in the southern rim (Bazhenov et al, 2003; Filippova et al, 2001; Gao et al, 2009; Lomize, Demina, & Zarshchicov, 1997; Long, Gao, Xiong, & Qian, 2007; Qian et al, 2009), which is significant for the formation of the Kazakhstan Block. Actually, the Middle Palaeozoic is not only a significant period for the Kazakhstan Block amalgamation, but also for the collage of the whole Central Asian Orogenic Belt (Chen, Liu, & Guan, 2019; Feng et al, 2018; Liu, Zhao, et al, 2018; Liu, Feng, et al, 2019; Zhou, Zhao, Han, & Wang, 2018).…”

Section: Discussionmentioning

confidence: 99%

Silurian alkaline magmatism in the Saur area, northern West Junggar: Evidence for the Middle Palaeozoic amalgamation of the Kazakhstan Block at the south‐west of the Central Asian Orogenic Belt

2020

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Although it is generally accepted that the Kazakhstan Block is an assemblage of Precambrian microcontinents and Early Palaeozoic island arcs, the details and timing constraint of the collage process need to be precisely studied in local regions. Thus, we conducted combined studies of geochemistry, zircon U–Pb geochronology and Sr–Nd–Hf isotopes upon the Awusiqi alkali‐feldspar granite and volcanic rocks from the Saur area in northern West Junggar. The Awusiqi volcanic rocks are mainly composed of andesites, rhyolites, and pyroclastic rocks. The alkali‐feldspar granite directly intrudes into the surrounding volcanic strata. Zircon U–Pb ages of the Awusiqi andesites, rhyolites, and alkali‐feldspar granite are 431 ± 3 Ma, 428 ± 5 Ma, and 426 ± 6 Ma, respectively. These new age data imply for the existence of Silurian magmatism in the Saur area. The alkali‐feldspar granite and rhyolites with high silica and alkali contents belong to metaluminous to weakly peraluminous and alkaline series and show seagull‐type REE patterns with strongly negative Eu anomalies. They are relatively enriched in the light rare earth elements (LREEs), K, Rb, Ba, Cs and other large‐ionic lithophile elements (LILEs), and are poor in P, Sr, and Eu, geochemically similar to those of A2‐type granites. The alkali‐feldspar granites have positive zircon εHf(t) values varying from +11.03 to +16.87 and young Hf model ages (TDM2 = 686 – 425 Ma). These features suggest that the Awusiqi alkali‐feldspar granite and rhyolites (except sample 18XJSF22C) were generated by partial melting of the juvenile lower crust with fractional crystallization, whereas sample 18XJSF22C shows mantle‐derived features. Awusiqi andesites show typical sanukitic high‐Mg andesites characteristics(Mg# = 48.08 – 65.52). The andesites are enriched in LREEs and LILEs, and are depleted in Nb, Ta, and Ti. They also have relatively high initial 87Sr/86Sr ratios (0.70543 – 0.70547), positive εNd(t) values (+2.5 – +5.7), and ancient Nd model ages (TDM1 = 1,093 – 815 Ma). These features suggest the andesites were likely derived from partial melting of a depleted mantle source previously metasomatized by slab‐derived fluids and melts. The discovery of Silurian magmatism in the Saur area has further confirmed the existence of Early Palaeozoic Tarbagtay arc basement and widespread Middle Palaeozoic A2‐type granitoids. We favor a post‐collisional setting in the Silurian in northern West Junggar, which also is the local embodiment of the Middle Palaeozoic amalgamation of the Kazakhstan Block.

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“…As mentioned above, three GM samples 17LT01-3, 17LT01-5, and 17LT01-7 were probably partial melting products of crustal mafic rocks. Given that sample 17LT01-5 yields an average T DM (Hf) value of $436 Ma (Table S2), average compositions of reported $430 Ma gabbro and $447 Ma amphibole gabbro from the northwestern Zhalantun area are considered source rocks (C O ) for GM rocks 17LT01-3, 17LT01-5, and 17LT01-7 (Feng et al, 2018;Qin et al, 2019, Table S4). With respect to residual minerals, negative Eu and (Gd/Yb) N of 1.59-2.27 infer that garnet may be a residue phase but not a major one.…”

Section: Simulation Modelling For Diagenetic Processmentioning

confidence: 99%

“…A purple line and a claybank line refer to simulations between average GM compositions and YQ38, and between 17LT01-3 and YQ38, respectively. Partial melting simulations in (i) are taken as the mean values of reported gabbros fromQin et al (2019) andFeng et al (2018) as parental magma compositions. Curves 1-8 represent different mineral residuals.…”

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confidence: 99%

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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Silurian magmatism on the eastern margin of the Erguna Block, NE China: Evolution of the northern Great Xing'an Range

Cited by 28 publications

References 86 publications

Late Devonian to early Carboniferous magmatism in the western Songliao–Xilinhot block, Northeast China: Implications for eastward subduction of the Nenjiang oceanic lithosphere

Late Devonian to early Carboniferous magmatism in the western Songliao–Xilinhot block, Northeast China: Implications for eastward subduction of the Nenjiang oceanic lithosphere

Silurian alkaline magmatism in the Saur area, northern West Junggar: Evidence for the Middle Palaeozoic amalgamation of the Kazakhstan Block at the south‐west of the Central Asian Orogenic Belt

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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