Evolution of Middle-Late Triassic granitic intrusions from the Badaguan Cu-Mo deposit, Inner Mongolia: Constraints from zircon U-Pb dating, geochemistry and Hf isotopes

Kang, Yongjian; Hongquan, She; Lai, Yue‐Yun; Wang, Zhaoqiang; Jinwen, LI; Zhang, Zuoheng; Xiang, Anping; Jiang, Zongsheng

doi:10.1016/j.oregeorev.2018.02.013

Cited by 22 publications

(8 citation statements)

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“…Early–Middle Triassic calc‐alkaline intermediate‐felsic rocks and porphyry‐ and skarn‐type Cu–Mo deposits are also associated with an active continental margin at the western edge of the EB, but are subordinate within the CGXR (Figure a; Chen et al, ; Kang et al, ; Mi et al, ), indicating a southward subduction of the MO oceanic plate along an area equivalent to the lateral extent of the EB rather than the XB during the Early–Middle Triassic (Figure a).…”

Section: Discussionmentioning

confidence: 99%

“…porphyry-and skarn-type Cu-Mo deposits are also associated with an active continental margin at the western edge of the EB, but are subordinate within the CGXR (Figure 9a; Chen et al, 2010;Kang et al, 2018;Mi et al, 2017), indicating a southward subduction of the MO oceanic plate along an area equivalent to the lateral extent of the EB rather than the XB during the Early-Middle Triassic (Figure 10a). allel to the MO belt, and these rocks originated due to the partial melting of delaminated lower crust and interaction with surrounding mantle material during magma ascent Xu et al, 2017) in an extensional setting associated with the closure of the PAO during the Late Triassic.…”

Section: Early-middle Triassic Calc-alkaline Intermediate-felsic Rockmentioning

confidence: 99%

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Timing and evolution of Mesozoic volcanism in the central Great Xing'an Range, northeastern China

et al. 2018

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In this paper, we report on LA‐ICP‐MS zircon U–Pb dates of 14 Mesozoic volcanic rocks from the central Great Xing'an Range (CGXR). These data are integrated with the temporal and spatial distribution of local magmatism‐related Mesozoic mineralization, in an effort to develop an understanding of the geodynamic evolution of the region. Periodic magmatic events in the GXR date from ~1,703 through ~145 Ma. Mesozoic volcanism in the CGXR can be subdivided into three episodes: Triassic (250–205 Ma), Early–Middle Jurassic (182–165 Ma), and Late Jurassic–Early Cretaceous (155–115 Ma). A revision of the previously defined volcanic sequence is offered using a combination of our zircon U–Pb ages and published Mesozoic geological and geophysical evidence from northeast China. We propose that (a) Early–Middle Triassic volcanism in the CGXR resulted from subduction of the Paleo‐Asian oceanic plate; (b) Late Triassic volcanism was related to subduction of the Mongol–Okhotsk oceanic plate (especially near the Erguna Block) and subsequent extension after the closure of the Paleo‐Asian Ocean; (c) Early–Middle Jurassic volcanism was mainly controlled by the southward subduction of the Mongol–Okhotsk oceanic plate; (d) Late Jurassic–initial Early Cretaceous magmatism was initiated by closure of the Mongol–Okhotsk Ocean; and (e) late Early Cretaceous volcanism was induced following the final closure of the Mongol–Okhotsk Ocean and rollback of the Paleo‐Pacific oceanic plate.

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Section: Discussionmentioning

confidence: 99%

Section: Early-middle Triassic Calc-alkaline Intermediate-felsic Rockmentioning

confidence: 99%

Timing and evolution of Mesozoic volcanism in the central Great Xing'an Range, northeastern China

et al. 2018

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“…Examples are the Badaguan Cu-Mo deposit (~228 Ma), Taipingchuan Cu-Mo deposit (~202 Ma), and Wunugetushan Cu-Mo deposit (183−178 Ma) (Fig. 13a; Chen et al, 2010;Kang et al, 2014;Deng et al, 2019a). With the closure of the western section of the MOO in the Middle Jurassic, the northern part of the GXR was in a compressional setting, as evidenced by a series of thrust nappe structures (171−161 Ma; Xu et al, 2013;Guo et al, 2017) and S-type granites (such as muscovite monzogranite and garnet granite, 168−164 Ma; Fig.…”

Section: Tectonic and Metallogenic Implicationsmentioning

confidence: 99%

Geochronology and Geochemistry of Early Cretaceous A‐type Granites in Central–Eastern Inner Mongolia, China: Implications for Late Mesozoic Tectonic Evolution of the Southern Great Xing'an Range

Zhang

ZHANG

CHEN

et al. 2023

Acta Geologica Sinica (Eng)

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The southern Great Xing'an Range is the most critical Sn‐polymetallic metallogenic belt in northeast China. However, the tectonic setting of the Early Cretaceous magmatic‐metallogenic “flare‐up” event remains uncertain. This paper presents an integrated study on the occurrence, petrology, zircon U–Pb ages, whole‐rock geochemistry, and in situ zircon Hf isotopes for Wenduerchagan granites of Xi Ujimqin Banner, central‐eastern Inner Mongolia. These granites consist primarily of granite porphyry (with ages of 137 ± 1 Ma and 138 ± 1 Ma) and (porphyritic) alkali feldspar granite (with an age of 141 ± 2 Ma), corresponding to the early Early Cretaceous. They are A‐type granites characterized by high silicon, alkali, and FeOT/MgO contents while being depleted of Ba, Nb, Ta, Sr, P, and Ti. They show right‐dipping trend rare‐earth element distribution characteristics with negative Eu anomalies (Eu/Eu* = 0.01–0.20) and weak heavy rare‐earth element fractionation ((Gd/Yb)N = 0.77–2.30). They demonstrate homogeneous zircon Hf isotopic compositions (positive ɛHf (t) values from +5.3 to +7.1 and young two‐stage Hf model ages of 851–742 Ma) and high zircon saturation temperatures (av. 810 °C). These geochemical characteristics indicate that Wenduerchagan granites originated from the partial melting of juvenile crust under high‐temperature and low‐pressure conditions. Wenduerchagan granites most likely formed in a post‐collisional compression‐extension transition regime caused by the closure of the Mongol‐Okhotsk Ocean, when combined with regional geology. Such a transition regime can probably be attributed to the upwelling of the asthenospheric mantle caused by the break‐off of a subducted Mongol‐Okhotsk oceanic slab. Upwelling asthenospheric mantle provided sufficient energy and favorable tectonic conditions for magmatism and mineralization of the Early Cretaceous.

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“…The subduction-related magmatic activities in the Transbaikalia such as the Selenge arc archived persistent north-directed subduction from the Middle Carboniferous to the Triassic or Jurassic [92,112]. The southward subduction was initiated since the Carboniferous as evidenced by the Middle Gobi arc [113], followed by widespread Permo-Triassic subduction-related magmatic activities in the Central Mongolia, Erguna, and Xing'an blocks [12,13,31]. During the Early Jurassic, the continued subduction of the MOOP triggered the initiation of crustal thickening, accompanied by the intrusion of high-K calc-alkaline I-type monzogranites in the Erguna Block at ca.…”

Section: Geodynamic Scenariomentioning

confidence: 99%

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

et al. 2020

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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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Evolution of Middle-Late Triassic granitic intrusions from the Badaguan Cu-Mo deposit, Inner Mongolia: Constraints from zircon U-Pb dating, geochemistry and Hf isotopes

Cited by 22 publications

References 72 publications

Timing and evolution of Mesozoic volcanism in the central Great Xing'an Range, northeastern China

Timing and evolution of Mesozoic volcanism in the central Great Xing'an Range, northeastern China

Geochronology and Geochemistry of Early Cretaceous A‐type Granites in Central–Eastern Inner Mongolia, China: Implications for Late Mesozoic Tectonic Evolution of the Southern Great Xing'an Range

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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