Nature and development of the South Tianshan-Solonker suture zone

Li, Hao-Dong; Zhou, Jian‐Bo; Wilde, Simon A.

doi:10.1016/j.earscirev.2022.104189

Cited by 21 publications

(4 citation statements)

References 197 publications

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“…There are usually several geodynamic environments for the generation of adakite in the subduction zone: (1) the initiation of subduction; (2) partial melting of young and hot oceanic crust; (3) ridge subduction; and (4) slab break-off (Defant & Drummond, 1990; Sajona et al 1993; Yogodzinski et al 1995; Guivel et al 1999; Calmus et al 2003; Jian et al 2010; Castillo, 2012). The CAOB is usually considered to have undergone prolonged subduction and accretion until the Early-Middle Triassic (Eizenhöfer et al 2014; Eizenhöfer & Zhao, 2018; Li et al 2022b; Xiao et al 2003; Jing et al 2020, 2021; Huang et al 2018; Wu et al 2011). Therefore, the first and second assumptions are not suitable.…”

Section: Discussionmentioning

confidence: 99%

Tectonic evolution of the Middle-Late Permian orogenic belt in the eastern part of the CAOB: Implications from the magmatism in the Changchun-Kaiyuan area

Zhang,

Liu,

et al. 2023

Geol. Mag.

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Various magmatisms during the subduction-collision process are crucial to reveal the long-term tectonic evolution of the eastern Central Asian Orogenic Belt. In this paper, we present major and trace elements of whole-rock, zircon U-Pb dating and Hf isotope of the Shanmen pluton. Results imply that the Shanmen pluton consists of quartz diorite and mylonitic granite, with zircon U-Pb ages of 263.7–259.6 Ma. The studied quartz diorite contains high Sr/Y (51.19–90.87) and (La/Yb)N (7.82–13.62) ratios, and belongs to adakitic rocks. Coupled with the positive εHf(t) values of +5.71 to +12.8 with no obvious Eu anomaly, we propose that quartz diorite is the product of the interaction between different degrees of slab melt and the overlying mantle wedge. In contrast, the mylonitic granite has lower MgO (0.28 wt% – 0.47 wt%) contents and positive εHf(t) values of +7.79 to +10.15, indicating an affinity with I-type granite originated by partial melting of the intermediate-basic lower crust. The geochemical characteristics and lithological assemblages, along with the Permian magmatic rocks in the Changchun-Kaiyuan area displaying arc rocks affinity, propose their formation is related to the southward subduction of the Paleo-Asian Ocean (PAO). Based on this study and previous evidence, we lean towards adopting a middle-late Permian slab break-off model, wherein the PAO did not close until the late Permian.

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Section: Discussionmentioning

confidence: 99%

Tectonic evolution of the Middle-Late Permian orogenic belt in the eastern part of the CAOB: Implications from the magmatism in the Changchun-Kaiyuan area

Zhang,

Liu,

et al. 2023

Geol. Mag.

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“…Since then, NCC was continually effected by the subduction of surrounding plates, which caused large‐scale magmatism, including arc‐type and subsequent post‐orogenic magmatism (Dong et al., 2011; Meng et al., 2020; Wang et al., 2003; Zhang et al., 2014). During the Carboniferous–Permian, the northern margin was strongly influenced by the southward subduction of Paleo‐Asian Ocean, forming the Central Asian orogenic belt (CAOB), and the Solonker suture marks the final closure of the Paleo‐Asian Ocean and the amalgamation of the NCC and the southern Mongolian terranes during the Late Permian to Early Triassic (Li et al., 2022; Xiao et al., 2003). During the Silurian–Triassic, the southern margin of the NCC experienced subduction of the Paleo‐Qinling(Mianlue)‐Shangdan oceanic plate followed by multiple collisions of micro‐continents, forming the Qinling orogen (Wu & Zheng, 2013).…”

Section: Geological Settingmentioning

confidence: 99%

Circum‐Cratonic Triassic Syenite Province of North China Craton Reveals Heterogeneous Lithospheric Mantle Related to Dual Subduction

Liu,

Peng,

Mitchell

et al. 2023

JGR Solid Earth

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Subduction‐induced metasomatism may increase heterogeneity in the subcontinental lithospheric mantle (SCLM) over time. Syenite and its relevant varieties are typically derived from the most metasomatized portions of the SCLM and thus provide a key to decipher its heterogeneity. The only circum‐cratonic syenite province in the world, the Late Triassic belt around North China craton, is unique and offers an opportunity to investigate heterogeneity of the SCLM right before its destruction in the Mesozoic. New and previous data of whole‐rock Sr‐Nd and zircon in situ Hf‐O isotopes of syenite intrusions encircling the craton indicate two distinct types of metasomatism characterized by an alteration of juvenile or ancient materials. The spatiotemporally distinct sources can be discriminated by melts from oceanic slabs subducting beneath much of North China followed by deep subduction of South China craton only in the south. This unique setting of a circum‐cratonic syenite belt proves in a single case study that subduction‐induced metasomatism may cause craton‐scale SCLM heterogeneity.

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“…Until now, there are vigorous controversies about the timing of the final closure of the PAO. The final closure might have occurred in the middle Devonian (Su et al, 2011;Li et al, 2013;Xu et al, 2013), before the late Carboniferous (Xia et al, 2012;Li et al, 2022), before the early Permian (Xie et al, 2020), during the late Permian to early Triassic (Xiao et al, 2018;Li et al, 2020) or the in Triassic (Song et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Late Paleozoic tectonics of Southern Central Asian orogenic belt: Evidence from magmatic rocks in the northern Alxa, Northwest China

Wang

Zhai²,

Chen³

et al. 2023

Front. Earth Sci.

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Late Paleozoic magmatic rock outcrops are common in the Northern Alxa, Southern Central Asian Orogenic Belt (CAOB), which is a key area for understanding tectonic processes and defining the final closure time of the Paleo-Asian Ocean (PAO). We present zircon U‒Pb chronology and whole-rock geochemistry data for late Paleozoic magmatic rocks from the Yagan area of northern Alxa. This paper reveals two periods of magmatism: syenogranite (374.8 Ma) and bimodal intrusive rocks, which consist of gabbro (261.4 Ma), diabase (262.9 Ma) and biotite monzogranite (263.4 Ma). The syenogranite is high-K calc-alkaline and shows enrichments in Th, Zr, Hf and LREEs; depletions in Sr, Nb, Ta, and Ti; and low Mg# values (6.9–13.2); the syenogranite was derived from partial melting of the crust and has volcanic arc characteristics. The gabbro and diabase have similar geochemical characteristics, such as enrichments in Pb, Rb, Sr, Zr, and Hf and depletions in Nb, Ta, and Ti, with positive εHf(t) values (+0.9–+2.7 and +2.6–+3.6, respectively), indicating that they originated from partial melting of depleted mantle and experienced crustal contamination during magma emplacement. The biotite monzogranite shows depletions in Nb, Ta, and Ti and εNd (t) values of -2.6 to −2.4 and resulted from partial melting of the lower crust caused by asthenospheric underplating. The bimodal intrusive rocks formed in a postcollision extensional setting. Combined with previous data, we conclude that northern Alxa was an active continental margin during the late Devonian and that the final closure of the Yagan branch ocean of the PAO occurred prior to the middle Permian.

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Nature and development of the South Tianshan-Solonker suture zone

Cited by 21 publications

References 197 publications

Tectonic evolution of the Middle-Late Permian orogenic belt in the eastern part of the CAOB: Implications from the magmatism in the Changchun-Kaiyuan area

Tectonic evolution of the Middle-Late Permian orogenic belt in the eastern part of the CAOB: Implications from the magmatism in the Changchun-Kaiyuan area

Circum‐Cratonic Triassic Syenite Province of North China Craton Reveals Heterogeneous Lithospheric Mantle Related to Dual Subduction

Late Paleozoic tectonics of Southern Central Asian orogenic belt: Evidence from magmatic rocks in the northern Alxa, Northwest China

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