The Continental Collision Process Deduced from the Metamorphic Pattern in the Dabie‐Hongseong and Himalayan Collision Belts

Oh, Chang Whan

doi:10.1002/9781118888865.ch2

Cited by 9 publications

(3 citation statements)

References 133 publications

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“…This inferred geometry of the intracontinental orogenic belt is consistent with the generally accepted model of the Central China Orogenic belt, where the amalgamation of North and South China initiated in the east and gradually propagated to the west (Fig. 1b) (Gilder et al, 1999;Huang et al, 2018;Oh, 2015;Yin and Nie, 1993).…”

Section: Permian Initiation Of the Continental Collision And Restrict...supporting

confidence: 88%

East Asia orogenesis restricted oceanic circulation between Paleo-Tethys and Panthalassa before the Permian mass extinction

Zhao

Mitchell

et al. 2022

Preprint

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The Paleo-Tethys and Panthalassa are two major oceans that witnessed the end-Permian mass extinction, and they have been suggested to have distinct compositions, with the Paleo-Tethys Ocean euxinic, and the much larger Panthalassa Ocean being largely ventilated. Distinctions of these two once-connected oceans imply that interactions between them must have been restricted shortly before the end-Permian extinction. However, detailed geological processes for the disconnection between them along the eastern Paleo-Tethys Ocean due to the collision of North and South China, are still unclear. Previous geochronological studies on eclogite facies rocks in the Dabie–Sulu orogenic belt, which are the metamorphic products of the collision between North and South China, have yielded mainly Triassic metamorphic ages. Nonetheless, new Permian metamorphic ages are identified from southeastern North China, northern Dabie, and the Permo–Triassic intracontinental orogen of South China, which may collectively closely associate this major tectonic event with the end-Permian extinction. New age dating results, as well as a synthesis of recent studies on metamorphic rocks, show that the onset of the collisional orogenesis dates back to the Middle Permian (270–252 Ma). We thereby provide a new tectonic model for the major continents of East Asia, in which the initial collision between North and South China during the Middle Permian critically isolated the Paleo-Tethys Ocean from the Panthalassa Ocean, facilitating the oceanographic transition of the once fossiliferous Paleo-Tethys from a life-giving nutrient-rich ocean into a euxinic death trap, thereby serving as prelude to the end-Permian extinction.

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Section: Permian Initiation Of the Continental Collision And Restrict...supporting

confidence: 88%

East Asia orogenesis restricted oceanic circulation between Paleo-Tethys and Panthalassa before the Permian mass extinction

Zhao

Mitchell

et al. 2022

Preprint

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“…Such a younging trend suggests that the onset of the intracontinental orogeny started from the northeast of South China and propagated to the southwest. This inferred geometry of the intracontinental orogenic belt is consistent with the generally accepted model of the Central China Orogenic belt, where the amalgamation of North and South China initiated in the east and gradually propagated to the west (Figure 2b) (Gilder et al, 1999;Huang et al, 2018;Oh, 2015;Yin & Nie, 1993).…”

Section: Permian Initiation Of the Continental Collisionsupporting

confidence: 88%

The Joining of North and South China During the Permian: Coherent Metamorphic Evidence From East Asia Orogenesis

Zhao,

Tang,

Mitchell

et al. 2023

Tectonics

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The joining of the North and South China blocks marks the formation of the united East Asian continent, which is an integral part of Pangea. The amalgamation of these two continental blocks also resulted in the formation of the world‐class ultrahigh pressure orogenic belt, namely the Dabie–Sulu orogenic belt. Figuring out the time of the initial collision between the two continents is critical for resolving questions such as the duration and the geodynamic processes of the orogeny. A Triassic joining time has been suggested by the geochronology of the eclogite facies rocks in this orogenic belt. However, paleomagnetic and paleontological studies suggested a Permian docking time for these continental blocks. In this paper, we present new metamorphic ages of rocks from northern Dabie and the Permo–Triassic intracontinental orogen of South China, which are all closely associated with this continental collisional event. New age dating results, as well as a synthesis of recent studies on metamorphic rocks occurring in southeastern North China and the Cathaysia Block of South China, show that the onset of the collisional orogenesis along the eastern part of the orogenic belt dates back to the Middle Permian (270–252 Ma). Considering these data and other geological records, we provide a new tectonic model for the major continents of East Asia, in which we show that the initial collision between North and South China occurred in the east during the Middle Permian, and then propagated westward. Continental collisions forming mountains and closing seaways in East Asia thus apparently occurred before the end‐Permian mass extinction, suggesting these paleogeographic changes might have also preconditioned and facilitated the end‐Permian biospheric crisis in the region.

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“…Alternatively, the schematically proposed Hongseong-Imjingang or Hongseong-Odaesan (for locations, see Fig. 2) belts were considered to be the extended collision zone (Oh, 2006(Oh, , 2016Kwon et al, 2009;Oh et al, 2015). More recently, Cho et al (2017a) suggested that the Imjingang, Okcheon, and Taean-Hongseong belts, collectively referred to as the Gyeonggi Marginal Belt, represent the Neoproterozoic to Paleozoic rift-and arc-related tectonic slivers built upon the North China-like Gyeonggi Massif.…”

Section: Geological Backgroundmentioning

confidence: 99%

Magmatic response to the interplay of collisional and accretionary orogenies in the Korean Peninsula: Geochronological, geochemical, and O-Hf isotopic perspectives from Triassic plutons

Cheong

Jeong

et al. 2018

GSA Bulletin

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Phanerozoic internal and peripheral orogens in Northeast Asia converge toward the Korean Peninsula situated between cratonic Asia and the outboard magmatic arc. Widespread Mesozoic plutons in the peninsula provide first-hand information about the magmatic response to the continental and oceanic plate subduction. The present study addresses this issue using comprehensive (n >1100) whole-rock geochemical, zircon U-Pb geochronological, and O-Hf isotopic data obtained from Triassic gabbro-pyroxenitemangerite-monzonite-syenite-granodioritegranite plutons in the central and southern parts of the peninsula. The intrusion of ca. 265-250 Ma calc-alkaline granitoids, including the high-silica adakite, along the outboard (in present coordinates) Yeongnam Massif is coeval with or slightly younger than the Barrovian metamorphism recognized in fold-and-thrust belts surrounding the inboard (northward, present coordinates) Gyeonggi Massif, suggesting a close link between the collisional orogenesis and subduction initiation as commonly documented in Phanerozoic supercontinents. Subsequent Late Triassic plutons emplaced in the Yeongnam Massif are subdivided into the older (232-224 Ma) magnesian and alkalicalcic to calc-alkalic group and the younger (220-217 Ma) ferroan and alkalic to alkalicalcic group temporally intervened by the geochemically arc-like Andong ultramafic complex (222 Ma). Zircon O-Hf isotopic compositions of the older plutons reflect the mixing of metasomatized lithospheric mantle, young (probably Paleozoic) arc crust, and Precambrian basement crust, whereas those of the younger plutons reflect input of the asthenospheric/lithospheric mantle and mafic lower crust. Meanwhile, the Late Triassic (233-224 Ma) potassic plutons in and around the Gyeonggi Massif represent postcollisional magmatism most likely induced by slab breakoff, which may also have been responsible for the shoshonitic magmatism in the Yeongnam Massif. Spatial differences in the age pattern and O-Hf isotopic signature of inherited and synmagmatic zircons from the potassic plutons indicate a selective contribution from an ancient metasomatized lithospheric mantle beneath the North China-like craton and an allochthonous South China-like lithosphere. The formation of the Triassic plutons could be explained by a series of tectonomagmatic events consisting sequentially of the ridge subduction, low-angle subduction, slab breakoff beneath the collisional orogen, tectonic switch to an extension-dominated arc system, and delamination of an overthickened arc lithosphere.

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The Continental Collision Process Deduced from the Metamorphic Pattern in the Dabie‐Hongseong and Himalayan Collision Belts

Cited by 9 publications

References 133 publications

East Asia orogenesis restricted oceanic circulation between Paleo-Tethys and Panthalassa before the Permian mass extinction

East Asia orogenesis restricted oceanic circulation between Paleo-Tethys and Panthalassa before the Permian mass extinction

The Joining of North and South China During the Permian: Coherent Metamorphic Evidence From East Asia Orogenesis

Magmatic response to the interplay of collisional and accretionary orogenies in the Korean Peninsula: Geochronological, geochemical, and O-Hf isotopic perspectives from Triassic plutons

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