Early Cretaceous volcanic rocks in the Great Xing’an Range: Late effect of a flat-slab subduction

Deng, Changzhou; Dong, Sun; Li, Guanghui; Lu, Shan; Tang, Zong‐Yuan; Gou, Jun; Yang, Yue-Tzu

doi:10.1016/j.jog.2019.01.012

Cited by 47 publications

(20 citation statements)

References 91 publications

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“…Consequently, the spatial distribution of magmatic rocks and tectonic locations of the Erguna Block indicate that the magmatism within the block was associated with neither the Paleo-Asian nor the Paleo-Pacific tectonic regimes. In addition, the impact of the Mongol-Okhotsk tectonic regime is suggested to extend at least as far as the eastern margin of the Xing'an Block, which lies in the southeast of the Erguna Block (Figure 1b) [12,91]. Thus, we consider that the Mongol-Okhotsk tectonic regime played a dominant role in accounting for the generation of the Early-Middle Jurassic intrusive rocks in the Erguna Block.…”

Section: Tectonic Regimementioning

confidence: 82%

Genesis of Early–Middle Jurassic Intrusive Rocks in the Erguna Block (NE China) in Response to the Late-Stage Southward Subduction of the Mongol–Okhotsk Oceanic Plate: Constraints from Geochemistry and Zircon U–Pb Geochronology and Lu–Hf Isotopes

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The subduction processes and geodynamic scenarios of the late-stage southward subduction of the Mongol–Okhotsk oceanic slab since the Early Jurassic are subjects of great debate. This contribution presents new U–Pb zircon dating, trace element geochemistry, Ti-in zircon geothermometry, and Lu–Hf isotopes of zircon, as well as bulk-rock geochemical data for Early–Middle Jurassic intrusive rocks in the Erguna Block, NE China. Approximately 181–198 Ma monzogranites and ca. 162–174 Ma quartz monzonites were identified in the block. The Early Jurassic monzogranites are high-K calc-alkaline I-type granites, which display moderately concave-upward rare earth element (REE) patterns with slightly negative Eu anomalies, and low zircon crystallization temperatures. The Middle Jurassic quartz monzonites have low Yb and Y concentrations, high Sr/Y ratios, and strong high field strength elements (HFSEs) depletions, that are in excellent agreement with adakitic rocks. They exhibit right-sloping REE patterns with negligible Eu anomalies, and a wide range of zircon crystallization temperatures. The intrusions yield εHf(t) values between −4.1 to +4.8 and juvenile two-stage model (TDM2) ages varying from 918–1488 Ma. The geochemical and isotopic signatures suggest that the monzogranites were likely derived by the partial melting of K-rich meta-basalts within the lower part of a juvenile crust that had medium-thickness (≤40 km), with the involvement of minor mantle materials. Whereas, the quartz monzonites were possibly produced by partial melting of a thickened continental lower crust (≥50 km). The Mongol–Okhotsk tectonic regime played a dominant role in accounting for their formation. An Andean-type continental arc setting was developed during the Early–Middle Jurassic, with gradual thickening of the continental crust. The significant crustal thickening may reach its ultimate stage at ca. 162–174 Ma, which marks the tectonic transition from compression to extension. The southward subduction beneath the Erguna Block was continuous and stable during the Early Jurassic. Rollback of the subducted slab occurred at ca. 174–177 Ma, followed by moderate magmatic activities represented by adakitic rocks.

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Section: Tectonic Regimementioning

confidence: 82%

Genesis of Early–Middle Jurassic Intrusive Rocks in the Erguna Block (NE China) in Response to the Late-Stage Southward Subduction of the Mongol–Okhotsk Oceanic Plate: Constraints from Geochemistry and Zircon U–Pb Geochronology and Lu–Hf Isotopes

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“…The Early Cretaceous igneous rocks consist of a suite of alkaline igneous rocks and A‐type granites, widespread volcanic rocks (Ge et al, ; Gou et al, ; Guo et al, ; Ji et al, ; Li et al, ; Lin, Ge, Cao, Sun, & Lim, ; Meng et al, ; ; Wang, Chen, & Ding, ), and exhumation of metamorphic core complexes (Li, Mo, He, Sun, & Chen, ; Mazukabzov et al, ; Miao, Zhang, Baatar, Zhu, & Anaad, ; Wang, Guo, et al, ) crop out in the Erguna Massif and the northern margin of the NCC within the Great Xing'an Range (Chen et al, ; Deng, Sun, Han, et al, ; Deng, Sun, Li, et al, ; Fan, Guo, Wang, & Lin, ; Liang et al, ; Wang et al, ; Wu et al, ; Xu et al, ; Ying et al, ; Zhang, ; Zhang et al, ), suggesting that they formed in a post‐collisional setting of an extensional environment (Wang et al, ; Xu et al, , Xu, Pei, et al, ; Meng et al, , ; Gao, Guo, Fan, Li, & Li, ; Gao et al, ; Li et al, ), also consistent with the large‐scale destruction of the eastern part of the NCC (Gao, Zhang, Xu, & Liu, ; Xu, Wang, et al, ; Zhai, Fan, Zhang, Sui, & Shao, ; Zhu, Chen, Wu, & Liu, ) and giant gold and porphyry Mo mineralisation in the NCC (Mao, Zhang, Yu, Wang, & Niu, ; Ouyang et al, ). This extensional event as a result of either delamination or upwelling of the thickened lithosphere of Mongol‐Okhotsk tectonic regime (Fan et al, ; Meng et al, ; Ouyang et al, ; Tang et al, ; Wang et al, ; Xu, Pei, et al, ; Ying et al, ; Zhang, ; Zhang et al, , ), and rollback of the back‐arc region associated with the subduction of the Paleo‐Pacific Plate (Figure c; Mao et al, ; Shao, Zhang, Xiao, & Li, ; Zhang et al, ; Wu et al, ; Zhou & Li, ; Hong et al, …”

Section: Discussion and Interpretationmentioning

confidence: 99%

Deformation of granitic rocks within Derbugan Fault belt, Erguna Massif, Northeast China: Implication of the subduction of Mongol‐Okhotsk oceanic plate

et al. 2019

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The NE-SW striking Derbugan Fault has been comprehensively accepted as a Mesozoic strike-slip fault in Erguna Massif rather than a suture belt of Erguna and Xing'an massifs. The rocks exposed within the fault belt, which consist of Jiageda Formation and intrusions which have been multiply deformed and metamorphosed. These deformed rocks provide an ideal opportunity to understand the geodynamics of the uplift history and tectonic evolution of Derbugan Fault in Mongol-Okhotsk regime and influence of the circum-Pacific tectonic regime, particularly during the later stages of the Mongol-Okhotsk Ocean collision. In this study, we report kinematics, mesomicrostructures, quartz EBSD analysis and geochronology data of the Jiageda Formation exposed within the Derbugan Fault belt in Cuogang area, Erguna Massif. The Jiageda Formation and granitic rocks have experienced regional metamorphism and deformation, and is mainly characterised by simple-shear dominated general shearing with LS tectonites. Our new zircon U-Pb data of mylonitic rocks from Cuogang area yielded ages between 381 to 401 Ma which was produced as a result of the subduction of the Paleo-Asian Ocean. Deformed granitic intrusive formed in the Early Triassic (244.8 ± 5.6 Ma) was related to the southward subduction of the Mongol-Okhotsk oceanic plate beneath the Erguna Massif. The Derbugan Fault represents a ductile to brittle deformation at decreasing crustal level due to the dominant oblique (subhorizontal) slip. The early sinistral strike-slip deformation with a medium temperature between 450 and 550°C developed at a deep ductile regime resulted from NW-SE extension. The subsequent deformation was essentially brittle that corresponded to a low-temperature deformation corresponded to a greenschist metamorphic facies. Crystallographic textures indicate a restricted recrystallisation of quartz mainly via dislocation creep through activation prismatic slip and rhomb slip system, with a later activation of basal slip system. The Early Cretaceous extensional environment may consist with the main medium temperature deformation stage of Derbugan Fault, which was related to either delamination or upwelling of the thickened lithosphere of the Mongol-Okhotsk tectonic regime, and rollback of the Paleo-Pacific Plate.

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“…The tectonic setting in the Late Mesozoic remains controversial. These different viewpoints toward the tectonic setting include subduction of the Mongol-Okhotsk Oceanic plate (Meng, 2003;Ying et al, 2010;Deng et al, 2019), westward subduction of the Paleo-Pacific Oceanic plate (Zhang et al, 2010(Zhang et al, , 2011, or both (Ouyang et al, 2015;Wan et al, 2018), as well as mantle plume activity (Niu et al, 2011). The mantle plume model is excluded because of the short longevity of mantle plume activity.…”

Section: Early Cretaceousmentioning

confidence: 99%

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confidence: 99%

Felsic Igneous Rocks in the Hua'aobaote Pb‐Zn‐Ag Polymetallic Orefield, Southern Great Xing'an Range: Genesis, Metallogenetic and Tectonic Significance

Shang

Chen

Guo

2022

Acta Geologica Sinica (Eng)

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Numerous granitoids that principally formed in the Paleozoic and Mesozoic were distributed along the GXAR and adjacent areas, which in some respects makes elucidating the tectonic evolution of this area difficult (Zhang et al., 2010;Meng et al., 2011;Wu et al., 2011;Deng et al., 2019). However, granitoids can provide vital information on the geodynamic setting in which they were generated. Extensive geochemical and geochronological research has been performed on intrusive and volcanic rocks over the past decade. The Paleo-Asian ocean was closed in the late Paleozoic and then the North China Craton was amalgamated with Mongolian terranes along the northern margin of the North China Craton, forming the eastern segment of the CAOB (Geng et al., 2009;Jiang et al., 2010). The GXAR subsequently entered the Mongol-Okhotsk and the Paleo-Pacific ocean tectonic regime (Wu et al., 2011).Over the past decades, many Mesozoic Pb-Zn-Ag deposits have been discovered in the GXAR, including the

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Early Cretaceous volcanic rocks in the Great Xing’an Range: Late effect of a flat-slab subduction

Cited by 47 publications

References 91 publications

Genesis of Early–Middle Jurassic Intrusive Rocks in the Erguna Block (NE China) in Response to the Late-Stage Southward Subduction of the Mongol–Okhotsk Oceanic Plate: Constraints from Geochemistry and Zircon U–Pb Geochronology and Lu–Hf Isotopes

Genesis of Early–Middle Jurassic Intrusive Rocks in the Erguna Block (NE China) in Response to the Late-Stage Southward Subduction of the Mongol–Okhotsk Oceanic Plate: Constraints from Geochemistry and Zircon U–Pb Geochronology and Lu–Hf Isotopes

Deformation of granitic rocks within Derbugan Fault belt, Erguna Massif, Northeast China: Implication of the subduction of Mongol‐Okhotsk oceanic plate

Felsic Igneous Rocks in the Hua'aobaote Pb‐Zn‐Ag Polymetallic Orefield, Southern Great Xing'an Range: Genesis, Metallogenetic and Tectonic Significance

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