An Early Cambrian plume-induced subduction initiation event within the Junggar Ocean: Insights from ophiolitic mélanges, arc magmatism, and metamorphic rocks

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

doi:10.1016/j.gr.2020.07.002

Cited by 35 publications

(11 citation statements)

References 196 publications

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“…The Central Asian Orogenic Belt (CAOB) is the largest accretionary orogenic belt in the world and is located between four cratons: the East European craton in the NW, the Siberian craton in the north, the Tarim craton in the S and the North China craton in the SE (Figure 14A). The CAOB formed by longlived subduction of the Paleo-Asian Ocean (PAO) which was active from the Neoproterozoic to Early Mesozoic (Khain et al, 2003;Xiao et al, 2019;Yang et al, 2020). Using geological, geochronological and geochemical observations, Yang et al (2020) investigated the timing and mechanism of subduction initiation in the PAO.…”

Section: Junggar Ocean In Northwest Chinamentioning

confidence: 99%

“…Modeling studies (Ueda et al, 2008;Gerya et al, 2015;Baes et al, 2016Baes et al, , 2020aBaes et al, and, 2020bDavaille et al, 2017;Lu et al, 2015;Crameri and Tackley, 2016) and geological and geochemical observations (Whattam and Stern, 2015;Davaille et al, 2017;Gao et al, 2019;Stern and Dumitru, 2019;Gülcher et al, 2020;Yang et al, 2020;Rodriguez et al, 2021;van Hinsbergen et al, 2021) have advanced our understanding of plume-lithosphere interplay and its role in forming new subduction zones. Here, we revisit models and natural examples of oceanic PISI.…”

Section: Introductionmentioning

confidence: 99%

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Plume-Induced Subduction Initiation: Revisiting Models and Observations

et al. 2021

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Subduction initiation induced by a hot and buoyant mantle plume head is unique among proposed subduction initiation mechanisms because it does not require pre-existing weak zones or other forces for lithospheric collapse. Since recognition of the first evidence of subduction nucleation induced by a mantle plume in the Late Cretaceous Caribbean realm, the number of studies focusing on other natural examples has grown. Here, we review numerical and physical modeling and geological-geochemical studies which have been carried out thus far to investigate onset of a new subduction zone caused by impingement of a mantle plume head. As geological-geochemical data suggests that plume-lithosphere interactions have long been important - spanning from the Archean to the present - modeling studies provide valuable information on the spatial and temporal variations in lithospheric deformation induced by these interactions. Numerical and physical modeling studies, ranging from regional to global scales, illustrate the key role of plume buoyancy, lithospheric strength and magmatic weakening above the plume head on plume-lithosphere interactions. Lithospheric/crustal heterogeneities, pre-existing lithospheric weak zones and external compressional/extensional forces may also change the deformation regime caused by plume-lithosphere interaction.

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Section: Junggar Ocean In Northwest Chinamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Plume-Induced Subduction Initiation: Revisiting Models and Observations

et al. 2021

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“…The three ophiolitic mélanges are composed of SSZ-type ophiolitic rocks, oceanic island pillow basalt, and overlying chert, subduction-related blueschist and amphibolite, and island arc granitoid and/or their tectonic blocks (Figure 1c; B. Liu et al, 2020;G. X. Yang, Li, Tong, Wang, & Si, 2020).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Both of the SSZ-type ophiolitic mélanges and island arc granitoids show a northward younger trend (Liao et al, 2021;B. Liu et al, 2020;G. X. Yang, Li, et al, 2020).…”

Section: Geological Backgroundmentioning

confidence: 99%

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Ediacaran‐Cambrian intra‐oceanic arc volcanic rocks in southern West Junggar, NW China: New constraints on the initial subduction of the Junggar‐Balkhash Ocean and migration of arc magmatism

Liao

Han

et al. 2021

Geological Journal

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As numerous blocks of the Ediacaran‐Cambrian supra‐subduction zone ophiolites, seamounts, subduction‐related metamorphic rocks, and arc granitoids have been identified in the ophiolitic mélanges in the contiguous West Junggar (China) and Balkhash (Kazakhstan) area, the initial subduction of the Junggar‐Balkhash Ocean, a major branch of the southern Palaeo‐Asian Ocean is emerging as an interesting topic. In this study, we present new data from diabase and basalt xenoliths in an Ediacaran‐Early Cambrian quartz‐monzonite block within the Tangbale ophiolitic mélange and an isolated dacitic tufflava block within the Saleinuohai ophiolitic mélange in southern West Junggar, NW China, as another line of evidence for the Ediacaran initial subduction of the Junggar‐Balkhash Ocean and the Cambrian migration of arc magmatism in West Junggar. The diabase and dacitic tufflava yield concordant zircon U–Pb ages of 568 and 530 Ma, respectively. The diabase and basalt exhibit high Al2O3 (17.38–17.75 wt%) and low TiO2 (0.69–0.90 wt%), with Mg# = 47–55, whereas the dacitic tufflava is characterized by high Na2O (7.87–8.43 wt%), with Mg# = 46–49. All the samples display similar LREE and large‐ion lithophile element (LILE) enrichment and Nb, Ta, Ti, and varying Zr and Hf depletion, indicating that they were formed in an intra‐oceanic arc setting. An integration of the new and published data shows that the subduction of the Junggar‐Balkhash Ocean was initiated in the Late Ediacaran at least, followed by slab rollback and retreat of subduction zone, which would be responsible for the northward migration of arc magmatism.

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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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An Early Cambrian plume-induced subduction initiation event within the Junggar Ocean: Insights from ophiolitic mélanges, arc magmatism, and metamorphic rocks

Cited by 35 publications

References 196 publications

Plume-Induced Subduction Initiation: Revisiting Models and Observations

Plume-Induced Subduction Initiation: Revisiting Models and Observations

Ediacaran‐Cambrian intra‐oceanic arc volcanic rocks in southern West Junggar, NW China: New constraints on the initial subduction of the Junggar‐Balkhash Ocean and migration of arc magmatism

The effect of seamount chain subduction and accretion

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