Geodynamic model and geological effect of seamount accretion in West Junggar, NW China

Yang, Gaoxue; Wang, Zuopeng; Li, Yongjun; Si, Guohao; Duan, Fenghao; Tong, Lili

doi:10.1080/00206814.2019.1686661

Cited by 4 publications

(3 citation statements)

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“…It is clear that the history of CAOB involved accretion and amalgamation of oceanic plateaus, seamounts, island arcs, and microcontinents (e.g., Kröner et al, 2014; Safonova & Santosh, 2014; Windley et al, 2007; Xiao et al, 2010; G. X. Yang et al, 2015; G. X. Yang, Li, et al, 2019), and accompanied with ridge subduction, slab roll‐back and oroclinal bending processes (e.g., P. F. Li et al, 2018, 2022; Y. J. Liu et al, 2021; T. Wang, Tong, et al, 2022; Windley & Xiao, 2018; Xiao et al, 2018, Xiao et al, 2020). However, geological effects of the subduction of seamounts and oceanic plateaus, which are likely present seamount chains on the ocean floors (e.g., Buchs et al, 2016; Greene et al, 2009; Kerr et al, 2000; Timm et al, 2013; J. Zhang & Zhang, 2020), has not been comprehensively evaluated yet during the formation of the CAOB (G. X. Yang et al, 2020). For example, the formation of Kazakhstan orocline was attributed to the buckling of linear belts (Abrajevitch et al, 2008; Xiao et al, 2010), or driven by asymmetric roll‐back with the amalgamation of the Siberian, Tarim, and Baltic cratons (P. F. Li et al, 2018).…”

Section: Implications For the Evolution Of Caobmentioning

confidence: 99%

“…Schematic diagram show the Tacheng oceanic plateau collision and subduction initiation behind the plateau from Ordovician to Carboniferous (Y. C. Chen et al, 2017; P. F. Li et al, 2018; G. X. Yang, Wang, et al, 2020). (a) The ocean subducted with the Tacheng oceanic plateau, and then the plateau came to forearc.…”

Section: Implications For the Evolution Of Caobmentioning

confidence: 99%

“…Except for subduction transference and subduction polarity reversal triggered by oceanic plateau collision, the plume‐induced subduction initiation played the dominant role prior to Cambrian in the CAOB (G. X. Yang et al, 2022; G. X. Yang, Li, et al, 2020). Moreover, the geochemical anomaly (higher Nd/Sm and 206 Pb/ 204 Pb ratios) in Devonian – Carboniferous volcanic rocks from West Junggar were probably affected by the partial melting of an early seamount in the subduction channel (G. X. Yang, Wang, et al, 2020). In addition, porphyry Cu and Au deposits in West Junggar may be also related to seamount subduction, due to seamount is a potential source of material to the subduction factory (Staudigel, Koppers, Plank, & Hanan, 2010).…”

Section: Implications For the Evolution Of Caobmentioning

confidence: 99%

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The effect of seamount chain subduction and accretion

Yang

Tong

et al. 2022

Geological Journal

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Seamount chains (oceanic plateaus, submarine ridges) are unique morphologic features on the seafloor, which resulted from the motion of the lithosphere over a convective plume. Seamount chains are being carried along by plate motions, which are eventually subducted beneath continental/oceanic plates or accreted in the accretionary complex, thus causing a series of effects in the convergent margin. In this paper, we briefly review the distribution and features of the typical modern seamount chains, including Hawaiian‐Emperor and Louisville seamount chains, Cocos, Ninetyeast and Caroline ridges, and Ogasawara Plateau, and mainly focus on the effects of seamount chains subduction and accretion. The geological effects mainly include the following: (1) deformation and tectonic erosion of the overriding plate; (2) flat‐slab subduction in the convergent margin; (3) growth of continental crust through time; (4) subduction initiation of plate tectonics; (5) generation of large earthquakes; (6) magmatism of the volcanic arc; and (7) formation of porphyry copper and gold deposits. The subduction of seamount chains resulted in similar effects in the Central Asian Orogenic Belt (CAOB) which is one of the largest and longest‐lived accretionary orogens on Earth. However, there are still many aspects that need further improvements, such as identification of the seamounts in the geological record, and geodynamic effects of subducted seamount chains. A detailed study on these sides of the seamount chains will enable us to further understand the tectonic evolution and metallogenesis of the CAOB, especially in accretionary orogenesis, continental crust growth, and subduction initiation dynamics.

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Section: Implications For the Evolution Of Caobmentioning

confidence: 99%

Section: Implications For the Evolution Of Caobmentioning

confidence: 99%

Section: Implications For the Evolution Of Caobmentioning

confidence: 99%

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The effect of seamount chain subduction and accretion

Yang

Tong

et al. 2022

Geological Journal

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Petrogenesis of the Cenozoic Lianhuashan pluton (SW China): Constrained by zircon U–Pb geochronology, Lu–Hf isotope, and geochemistry

Wang

Yang

et al. 2019

Geological Journal

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Potassic magmatic rocks provide significant insights in understanding of mantle composition, evolution, and interaction with crust. Potassic magmatism along the Jinshajiang-Ailaoshan Paleo-Tethyan suture has drawn much attention. Whereas igneous intrusion in the Simao terrane, west to Jinshajiang-Ailaoshan potassic magmatic belt has rarely been investigated. Hence, we present zircon U-Pb ages and Lu-Hf isotope and whole-rock geochemistry for the Lianhuashan pluton. Zircon U-Pb dating from monzonite and quartz monzonite porphyry yield ages of 33.6 ± 0.2 and 33.5 ± 0.3 Ma, respectively. Monzonites are characterized by high K 2 O (4.93-5.16%) and K 2 O/Na 2 O (1.46-1.71), high Y (22.90-23.80 ppm), and Yb (1.87-2.21 ppm), relatively enrichment of light rare earth element (LREE). Zircons from monzonites show ε Hf (t) values ranging from −1.1 to +0.6 and crustal model ages (T DM C ) between 1.04 and 1.15 Ga. These geochemical features suggest that parent magmas of the rocks originated from a metasomatized lithospheric mantle. Quartz monzonite porphyries are characterized by high Sr (836.00-1,529.00 ppm), Sr/Y (70.85-99.93) and La/Yb (32.31-49.83), low Y (11.80-15.60 ppm), and Yb (0.95-1.30 ppm), enrichment in LREE and depletion in heavy rare earth elements (HREE).Quartz monzonite porphyries have higher Mg # , MgO, Ni, and Cr contents than the lower crust-derived adakite-like rocks. It is suggested that they were derived by variable degree of mixing between lower-crustal melts and mafic magmas. Based on petrology and geochemistry features, the following evolution process are concluded.During the Neoproterozoic, metasomatic-enriched mantle magma resulted from the bisubduction of oceanic plate; meanwhile, the crust thickened, and juvenile lower crust formed. During late Eocene, hot asthenosphere upwelled and K-rich mafic magmas resulted from the decompression of delamination, followed by magmatism emplacing, crystallizing, and the forming of the Lianhuashan pluton. KEYWORDS Lianhuashan potassic pluton, magmatism model, metasomatized lithospheric mantle, the Sanjiang Orogen ). However, few detailed investigations have been carried out on the Lianhuashan pluton in the Simao terrane, which restricts understanding of the deep crust-mantle interaction, the genesis, and dynamic processes of potassic magmatic rocks in the Jinshajiang-Ailaoshan Suture. The Lianhuashan pluton is part of the Jinshajiang-Ailaoshan potassic magmatic belt and a representative pluton developed in the Lanping basins. Despite of few geological and geochemical researches on the Lianhuashan pluton since the 2000s (Dong et al., 2005;Liu et al., 2017), the magma source, evolution, and the tectonic setting are still obscure. This is partly due to the lack of precise geochemical data and integrated studies. In this paper, we present zircon LA-ICP-MS U-Pb age, Lu-Hf isotope, and whole-rock geochemistry for the Lianhuashan pluton with a view to (1) constrain the crystallization age, (2) reveal the magma source and magma evolution, and (3) construct a geodynamic ...

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Subduction initiation triggered by collision: A review based on examples and models

Yang

2022

Earth-Science Reviews

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Geodynamic model and geological effect of seamount accretion in West Junggar, NW China

Cited by 4 publications

References 181 publications

The effect of seamount chain subduction and accretion

The effect of seamount chain subduction and accretion

Petrogenesis of the Cenozoic Lianhuashan pluton (SW China): Constrained by zircon U–Pb geochronology, Lu–Hf isotope, and geochemistry

Subduction initiation triggered by collision: A review based on examples and models

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