Early Paleozoic subduction processes of the Paleo-Asian Ocean: Insights from geochronology and geochemistry of Paleozoic plutons in the Alxa Terrane

Liu, Qian; Zhao, Guochun; Sun, Min; Han, Ying‐Feng; Eizenhöfer, Paul R.; Hou, Wenzhu; Zhang, Xiaoran; Zhu, Yanlin; Wang, Bo; Liu, Dongxing; Xu, Bing

doi:10.1016/j.lithos.2016.07.041

Cited by 82 publications

(58 citation statements)

References 73 publications

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“…This is consistent with regional data that few magmatic events of this time interval exist in the Nuru‐Langshan and Shalazhashan tectonic zones in the ATB (Dan, Li, Wang, Tang, et al, ). The Late Ordovician to Early Devonian magmatic events (~408–464 Ma) recorded in sample 15ALS28 are consistent with the Early‐Middle Paleozoic granitic magmatism (~408 Ma and ~415–450 Ma) reported in the Beidashan area in the southeast end of the southwestern Alxa (Figure ), which was interpreted as the product of southward subduction of the PAO (Q. Liu et al, ; Zhou et al, ). This observation indicates that the Early‐Middle Paleozoic plutons could have been eroded and supplied detritus to the Middle Permian sedimentary rocks.…”

Section: Discussionsupporting

confidence: 78%

“…Comparison of the age distributions of the Permian volcanic‐sedimentary rocks from the southwestern Alxa (a) with magmatic records of the Alxa Tectonic Belt (b), southern Beishan Orogenic Belt (c), and southern Mongolia (d). Age sources for Alxa magmatic rocks (b) are from Dan, Li, Wang, Tang, et al (), Feng et al (), Liu et al (), Q. Liu, Zhao, Han, Eizenhofer, Zhu, Hou, and Zhang (), Q. Liu, Zhao, Han, Eizenhofer, Zhu, Hou, Zhang, and Wang (), Ran et al (), X. J. Shi et al (), G. Z. Shi et al (), W. Zhang et al (), J. J. Zhang, Wang, et al (), Zhang et al (), Zheng et al (), and Zhou et al (). Age sources for southern Beishan (c) are from Song et al () and W. Zhang et al ().…”

Section: Discussionmentioning

confidence: 99%

“…Neoproterozoic metasedimentary rocks consisting of marble, quartzite, metasandstone, and schist are mainly exposed in the Longshoushan and Gaotai areas (BGMRNM, ; Song et al, ). The Early Paleozoic granites mainly occur along the Beidashan, southeast of Alxa Youqi (Figure ), and were dated at ~415–450 Ma by LA‐ICP‐MS U‐Pb on zircons (Q. Liu et al, ). The Late Paleozoic granitoids were mainly emplaced during Late Carboniferous to Middle Permian (BGMRNM ; Q. Liu, Zhao, Han, Eizenhöfer, Zhu, Hou, Zhang, & Wang, ; our unpublished data), although some Early Devonian granites (~397–411 Ma) were also reported in the Beidashan area (Zhou et al, ).…”

Section: Geology Of the Southwestern Atbmentioning

confidence: 99%

“…Thus, the southernmost segment of the CAOB (Figure ), extending from the Tianshan Orogenic Belt in the west through the Beishan and Alxa tectonic belts in the middle to the Inner Mongolian Orogenic Belt in the east, has long been considered as the location that records the final subduction history of the PAO and the terminal amalgamation of the CAOB (e.g., Han et al, ; Q. Liu, Zhao, Han, Eizenhofer, Zhu, Hou, & Zhang, ; Q. Liu, Zhao, Han, Eizenhofer, Zhu, Hou, Zhang, & Wang, ; Şengör et al, ; Xiao et al, , ). A large number of publications have been focusing on the tectonic evolution of the western and eastern segments of the southern CAOB (e.g., Charvet et al, ; Eizenhöfer et al, ; Han et al, ; Jepson et al, ; Jian et al, , ; Y. J. Li et al, , Y. L. Li et al, ; Song et al, ; B. Wang et al, ; Xiao, Windley, Yuan, et al, ; Xiao, Huang, et al, ), while relatively little attention has been given to the Alxa area in the middle part of the southernmost CAOB (Figure ; Feng et al, ; Q. Liu et al, ; Q. Liu, Zhao, Han, Eizenhofer, Zhu, Hou, & Zhang, ; Q. Liu, Zhao, Han, Eizenhofer, Zhu, Hou, Zhang, & Wang, ). This makes the Alxa area one of the least understood tectonic belts within the CAOB.…”

Section: Introductionmentioning

confidence: 99%

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Final Subduction Processes of the Paleo‐Asian Ocean in the Alxa Tectonic Belt (NW China): Constraints From Field and Chronological Data of Permian Arc‐Related Volcano‐Sedimentary Rocks

et al. 2018

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The timing of final subduction and closure of the Paleo-Asian Ocean (PAO) is controversial.Located in a key position within the southern Central Asian Orogenic Belt, the Alxa Tectonic Belt (ATB) provides a crucial window to evaluate the final subduction processes of the PAO. This study presents field and geochronological data for Permian volcano-sedimentary rocks from the southwestern ATB. Field observations revealed a syntectonic unconformity between the Middle and Upper Permian strata. Detrital zircon U-Pb analyses show a major peak at~273 Ma and a subordinate peak at~440 Ma for the Middle Permian sample. The Upper Permian samples show consistently unimodal age spectra with single peaks at 261 and~263 Ma, respectively. The Permian zircons from the analyzed samples yield predominately positive ε Hf (t) values, indicating major juvenile magmatic processes mixed with limited recycled Precambrian basement. The diagnostic zircon U-Pb-Hf isotopic characteristics and ubiquitous intermediate and felsic volcanic detritus in these rocks indicate rapid sediments accumulation sourced from a proximal magmatic terrane in a suprasubduction zone environment. The Paleozoic zircon U-Pb age peaks from this study are comparable to those for the Permian arc-related sediments along the Solonker Suture Zone, thus linking the Alxa active margin with the northern margin of the North China Craton during Middle-Late Permian times. Our study thus provides key constraints for the final subduction processes of the PAO, documented within the ATB, before the terminal amalgamation of the southern Central Asian Orogenic Belt.

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Section: Discussionsupporting

confidence: 78%

Section: Discussionmentioning

confidence: 99%

Section: Geology Of the Southwestern Atbmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Final Subduction Processes of the Paleo‐Asian Ocean in the Alxa Tectonic Belt (NW China): Constraints From Field and Chronological Data of Permian Arc‐Related Volcano‐Sedimentary Rocks

et al. 2018

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“…Early Ordovician to early Devonian intrusions are locally distributed at the Beidashan and Alxa Youqi areas (Figure b). These rocks were dated from ~460 to ~397 Ma and were considered to be formed in a continental arc setting related to the southward subduction of the PAO (Liu et al, ; Zhou et al, ). The late Palaeozoic granitoids are widely distributed along the south‐western ATB.…”

Section: Geological Settingmentioning

confidence: 99%

LateCarboniferous–earlyPermian arc magmatism in the south‐westernAlxaTectonicBelt (NW China):Constraints on the latePalaeozoic subduction history of thePalaeo‐AsianOcean

et al. 2018

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The tectonic setting of the Alxa Tectonic Belt (ATB) during the late Palaeozoic is highly controversial. The nature and tectonic origin of the late Palaeozoic magmatism in the ATB are key to resolving the current controversy. This paper provides field, petrographic, geochemical, and zircon U‐Pb‐Hf isotopic data for the late Palaeozoic granitoids and volcanic rocks from the south‐western ATB. The granitoids display a wide range of SiO2 contents from diorite, granodiorite, to granites, with widely distributed hydrous minerals such as hornblende and biotite. They are calc‐alkaline to high‐potassium calc‐alkaline, metaluminous with an enrichment of light rare earth elements and large‐ion lithophile elements (LILE), and a depletion of high‐field‐strength elements (HFSE). The presence of mafic‐intermediate enclaves in the plutons suggests the role of crust–mantle interaction in generating the granitoids. The volcanic rocks show “block‐in‐matrix” structures in the field. They are dacite‐porphyry and rhyolite and show calc‐alkaline characteristics with an enrichment of LILE and a depletion of HFSE. Laser ablation inductively coupled plasma mass spectrometry zircon U‐Pb dating shows that the granitoids and enclaves crystallized during ~317–287 Ma and the dacite porphyry formed at ~295 Ma. Hf‐in‐zircon isotopic compositions reveal predominately positive εHf (t) values and Neoproterozoic TDMC ages for the magmatic rocks, indicating mixing between mantle‐derived magma and Precambrian basement during their genesis. The diagnostic field, geochemical data, and isotopic data imply these rocks were generated in a subduction‐related active continental margin setting. The presence of A2‐type granite indicates an extensional environment resulted from slab rollback in a retreating accretionary context can best interpret the large‐scale late Carboniferous–early Permian magmatism in the ATB. Our new data, combined with published data, imply that a large active continental margin existed in the Beishan, Alxa, and the northern margin of the North China Craton, due to the south‐dipping subduction of the Palaeo‐Asian Ocean (PAO) in the late Palaeozoic. Therefore, our data suggest that the PAO did not close until after the early Permian.

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Mid‐Mesozoicto Cenozoic multiphase deformation in the Bayanwula Tectonic Belt, northern China

et al. 2022

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The Bayanwula Tectonic Belt (BTB) is located between the Alxa Massif and the Ordos Basin in the northwestern North China Craton (NCC). The Mid-Mesozoic to Cenozoic deformation characteristics of the BTB is crucial for understanding the tectonic processes of eastern Asia during that time. Together with the regional geology, our field observation and structural analysis reveal that the BTB has undergone three phases of deformation since the Late Jurassic. The first phase of deformation (D 1 ) is represented by NE-SW-striking thrust faults involved in the Jurassic strata, indicating a phase of NW-SE shortening deformation. Based on the combination of angular unconformity between the Upper Jurassic and Lower Cretaceous strata, the timing of D 1 is constrained at the end of Jurassic and dynamically related to the westward subduction of the Palaeo-Pacific Plate during the end of the Jurassic. The second one (D 2 ) is characterized by the NE-SW-striking normal faults and Lower Cretaceous syn-sedimentary strata on both sides of the BTB, which show that a phase of NW-SE extension deformation occurred in the Early Cretaceous, dynamically related to the rollback of the Palaeo-Pacific Plate in the Early Cretaceous. The third stage of deformation (D 3 ) is represented by the NW-SE-striking folds that involved the Pliocene strata, as well as dextral strike-slipping of the East Bayanwula Fault and the West Helanshan Fault, indicating a phase of NE-SW shortening at the end of the Pliocene. Dynamically, the D 3 is related to the outward expansion of the Tibetan Plateau.

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Early Paleozoic subduction processes of the Paleo-Asian Ocean: Insights from geochronology and geochemistry of Paleozoic plutons in the Alxa Terrane

Cited by 82 publications

References 73 publications

Final Subduction Processes of the Paleo‐Asian Ocean in the Alxa Tectonic Belt (NW China): Constraints From Field and Chronological Data of Permian Arc‐Related Volcano‐Sedimentary Rocks

Final Subduction Processes of the Paleo‐Asian Ocean in the Alxa Tectonic Belt (NW China): Constraints From Field and Chronological Data of Permian Arc‐Related Volcano‐Sedimentary Rocks

LateCarboniferous–earlyPermian arc magmatism in the south‐westernAlxaTectonicBelt (NW China):Constraints on the latePalaeozoic subduction history of thePalaeo‐AsianOcean

Mid‐Mesozoicto Cenozoic multiphase deformation in the Bayanwula Tectonic Belt, northern China

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