New chronological constrains on the tectonic affinity of the Alxa Block, NW China

Song, Dongfang; Xiao, Wenjiao; Collins, Alan S.; Glorie, Stijn; Han, Chunming; Li, Yongchen

doi:10.1016/j.precamres.2017.07.015

Cited by 58 publications

(28 citation statements)

References 71 publications

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“…The lack of basalts in the volcanic association suggests a mature, continental arc rather than an intra‐oceanic island arc setting for the volcanic rocks (Ducea et al, ). This is consistent with the presence of fragmentary Precambrian basement along the south‐western ATB (Figure ; Song et al, , and references therein).…”

Section: Discussionsupporting

confidence: 87%

“…All the granitoids show predominately positive ε Hf ( t ) values below the depleted mantle line and relatively young T DM C ages of 659–1096 Ma (Figure ). The presence of latest Mesoproterozoic to Neoproterozoic crust is supported by a recent geochronological study on the metamorphic rocks in the south‐western ATB (Song et al, ). These suggest that the granitoids were likely generated by mixing of mantle‐derived magmas with minor late Precambrian basement.…”

Section: Discussionmentioning

confidence: 76%

“…Granitic gneisses at the Beidashan area have protolith ages of ~2.5 Ga and metamorphic ages of ~2.5 and ~1.85 Ga (Zhang, Gong, Yu, Li, & Hou, ). The protoliths for the metasedimentary rocks at the NW end of the south‐western ATB were deposited at Stenian–Tonian and Ediacaran periods, constrained by detrital zircon U‐Pb age data (Song et al, ). Early Ordovician to early Devonian intrusions are locally distributed at the Beidashan and Alxa Youqi areas (Figure b).…”

Section: Geological Settingmentioning

confidence: 99%

“…(a) A tectonic sketch map showing the tectonic position of the Central Asian Orogenic Belt, South China Craton; the location of Figure b is outlined; (b) A simplified geological map of the Alxa Tectonic Belt and its adjacent areas. Modified from Song et al (). The study area of Figure is outlined [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Introductionmentioning

confidence: 99%

“…Located in a key position in the southern CAOB, the Alxa Tectonic Belt (ATB; Song et al, ; Song, Xiao, et al, ) connects the Tianshan and Beishan orogenic belts to the west with the Inner Mongolia orogenic belt to the east (Figure b). The tectonic evolution of the ATB during the Palaeozoic is essential for understanding the overall subduction–accretion history of the southern CAOB.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 76%

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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A database of detrital zircon U–Pb ages in the North China Craton from the Paleoproterozoic to the early Palaeozoic

Dong,

Zuo,

Xiao

et al. 2023

Geoscience Data Journal

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U–Pb dating of detrital zircon is widely used in geology to identify the source of sediments and constrain palaeogeography and tectonic history. We collected the detrital zircon from the Paleoproterozoic to early Palaeozoic strata to understand the North China Craton's geological chronological characteristics. After screening and sorting out data information, we managed and analysed 84 papers from 2006 to 2022. Three hundred seventy‐nine samples comprising 29,431 pieces of U–Pb ages of detrital zircons gathered from the Proterozoic to Ordovician sedimentary rocks in North China Craton (NCC). Detrital zircons within five areas in the NCC, i. e., Xuhuai Basin, Zhaertai‐Bayan Obo‐Huade Basin, Yanliao Basin, Xiong'er Basin and Alxa Block, are discussed in detail. Meanwhile, we collected 2,588 pieces of Lu‐Hf detrital zircon data in the study. This Database can be helpful in understanding and explaining the tectonic evolution of the NCC from the Paleoproterozoic to the Early Palaeozoic.

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Tectonic evolution of the Qingshuihe Basin since the Late Miocene: Relationship with north‐eastward expansion of the Tibetan Plateau

Tian¹,

Li²,

Liang³

et al. 2019

Geological Journal

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Southwest Ningxia is located at the tectonic and geographical northeastern edge of the Tibetan Plateau and is an ideal site for studying continental dynamics and plateau building. The Southern Ningxia Arc Tectonic Belt (SNATB) formed during the Cenozoic period as a result of the collision between India and Eurasia and was affected by the Tibetan Plateau uplift. However, the upward growth and expansion processes of the SNATB remain unclear. We investigated the Qingshuihe Basin (a Late Cenozoic basin located between the Tianjingshan and Qingshuihe faults in the northeastern SNATB) using field geological surveys combined with borehole, high-density resistiv

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New chronological constrains on the tectonic affinity of the Alxa Block, NW China

Cited by 58 publications

References 71 publications

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

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

A database of detrital zircon U–Pb ages in the North China Craton from the Paleoproterozoic to the early Palaeozoic

Tectonic evolution of the Qingshuihe Basin since the Late Miocene: Relationship with north‐eastward expansion of the Tibetan Plateau

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