Late Carboniferous to early Permian sedimentary–tectonic evolution of the north of Alxa, Inner Mongolia, China: Evidence from the Amushan Formation

Yin, Haiquan; Zhou, Hang; Zhang, Weijie; Zheng, Xiaoming; Wang, Shengyu

doi:10.1016/j.gsf.2015.08.008

Cited by 16 publications

(13 citation statements)

References 17 publications

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“…In addition, from the geological records, in the early Silurian, the north of Alxa is still in the multi‐island environment under the stretching background (Yin, Zhou, Zhang, Zheng, & Wang, ). In this context, a set of abyssal‐bathyal sediments composed of radiolarian siliceous rocks, limestone (Bandingtaolegai Formation), and flysch deposition (Yuanbaoshan Formation) were formed in the continental marginal slope environment (Yin et al, ). Beginning in the early Silurian, the regional expansion gradually weakened and turned into a continental marginal activity stage dominated by subduction and cooperation.…”

Section: Discussionmentioning

confidence: 99%

Provenance and tectonic setting of the Palaeozoic sediments in the northern Alxa area: Implications for the Central Asian Orogenic Belt

Yin¹,

Zhou

Zhang

et al. 2020

Geological Journal

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Understanding the tectonic nature of the Alxa area is significant in tectonic reconstruction of the Central Asian Orogenic Belt, but their tectonic correlation, affinity, and implications have not been well defined. The late Palaeozoic sediments in the northern Alxa area can help to understand this question. The sedimentary sequence of the late Palaeozoic strata (Benbatu Formation) indicates that the sedimentary environment of the study area gradually changed from a stable carbonate platform to a bathyal‐abyssal environment with relatively active tectonic setting. The results of the grain size analysis of the sandstone debris show the typical characteristics of a turbidity current. The composition of clastic particles is mainly feldspar, which is characterized by short transport distance and rapid deposition of sediments. Combined with the geochemical characteristics of sandstone, the northern Alxa Block is considered to be an active continental margin in the late Palaeozoic. Through summarizing the zircon data of the Alxa Block, Tarim Craton, and North China Craton, it is concluded that the Palaeozoic clastic zircons in the study area come from the Alxa Block and the surrounding magmatic arc, the Neoproterozoic‐Middle Proterozoic zircons come from the Alxa Block, the Archean zircons come from the North China Craton. According to the age distribution of clastic zircons, the magmatic activity may exist in the early Palaeozoic, which suggests it may not be a stable passive continental margin in the margin of northern Alxa Block in the early Palaeozoic. Based on the provenance analyses, the sources block shows no tectonic affinity to the Tarim Craton, but the Hanwula area in the north of the study area might have been accreted to the Tarim Craton, which means the size of the Paleo‐Asian Ocean between the study area and the Hangwula area is large. The earliest Palaeozoic clastic zircon ages in sedimentary rocks are recorded in the late Cambrian, whereas the earliest Palaeozoic detrital zircons in the Hangwula area are recorded in the Ordovician, which means that the magmatic activity recorded in the study area is earlier than the Hangwula area and indicates that the subduction of the south side of the Paleo‐Asian Ocean began earlier than the north side. The evidence of magmatic rocks discovered so far confirms this view.

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Section: Discussionmentioning

confidence: 99%

Provenance and tectonic setting of the Palaeozoic sediments in the northern Alxa area: Implications for the Central Asian Orogenic Belt

Yin¹,

Zhou

Zhang

et al. 2020

Geological Journal

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“…Therefore, the tectonic background of the sedimentary basin can be effectively recovered by using the geochemical characteristics of clastic rocks. Tectonic environments of sedimentary basins mainly include four types: oceanic island arc, continental island arc, active continental margin, and passive continental margin (Bhatia & Crook, 1986; Li et al, 2016; Yin, Zhou, Zhang, Zheng, & Wang, 2016). Oceanic island arc consists of forearc and backarc basins, which are close to the volcanic arc and developed on the oceanic crust or thin continental crust.…”

Section: Discussionmentioning

confidence: 99%

“…Abbreviations: ACM, active continental margin; CI, continental island arc; DHG, Daohugou Formation; OI, oceanic island arc (Li et al, 2016; Shen et al, 2015; Yin et al, 2016); PCM, passive continental margin.…”

Section: Discussionmentioning

confidence: 99%

Geochemical characteristics and geological significance of Daohugou Formation at Ningcheng County of Inner Mongolia, Eastern China

Meng

et al. 2020

Geological Journal

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Geochemical characteristics of sedimentary rocks play an important role in indicating depositional environments and tectonic backgrounds. In this article, the major and trace elements of the Daohugou Formation are measured, which shows that the quartz and silicate minerals are abundant; trace elements, except for Rb, are depleted than that of the upper crust; the rare earth elements (REE) curves incline to the right with Eu negative anomaly and slight Ce negative anomaly. The Daohugou Formation is continental deposits with freshwater and oxic conditions, and the climate changes from warm and humid to hot and dry. The source rock of the Daohugou Formation is granite which experienced an intermediate chemical weathering under wet and warm conditions, and the tectonic background of the Daohugou Formation is a passive continental margin. It is deduced that the provenance of the Daohugou Formation is Archean gneiss in the south of the Daohugou Basin.

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“…Similar to microcontinents in the Central Tianshan and southern Beishan, which have a tectonic affinity with the Baltica Craton (He, Klemd, Yan, & Zhang, 2018; Huang et al, 2019), the ZSZ is also considered to be a microcontinent within the PAO and was accreted to the northern margin of the Alxa Block along Quagan Qulu suture zone. Consequently, late Carboniferous to early Permian arc‐related volcanic rocks and sedimentary rocks (i.e., the latest marine sediments, Amushan Formation) along both sides of the Qagan Qulu suture zone (W. Zhang, Wu, Feng, et al, 2013; Zheng et al, 2017), forming in an active continental margin (Yin et al, 2016), suffered nearly E‐ to W‐trending fold and thrust deformation (Shi, Song, et al, 2016). The early Permian (278–275 Ma) forearc bonintic complex in the Tepai‐Quagan Qulu ophiolitic mélange belts (Zheng et al, 2018) reveals the possible subduction‐accretion process.…”

Section: Discussionmentioning

confidence: 99%

“…Minor late Carboniferous granitoids also occur in this region (Yang et al, 2014). The Amushan Formation is the dominant Paleozoic volcano‐sedimentary units in this area and is mainly composed of volcanic rocks, neritic carbonate rocks, and clastic sediments, which has recently been explained to have been deposited during the Carboniferous to early Permian (Yin et al, 2016). Some Precambrian high‐grade metamorphic rocks are exposed in the Zongnaishan area, which yielded zircon U‐Pb ages of ca.…”

Section: Regional Tectonicsmentioning

confidence: 99%

Late Paleozoic Tectonic Evolution of the Paleo‐Asian Ocean in the Northern Alxa Block (NW China)

et al. 2020

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The northern Alxa Block occupies a key position in the southern margin of the Central Asian Orogenic Belt (CAOB) and records late Paleozoic subduction and closure processes of the Paleo‐Asian Ocean (PAO). However, there are still controversies regarding the timing and location of the final closure of the PAO. This study presents structural deformation data and geochronological and geochemical data for Permian volcanic rocks, as well as detrital zircon provenance analysis of Permian sedimentary rocks along the Nuoergong‐Langshan Zone (NLZ) in the northern Alxa Block. During the early to middle Permian, the PAO lithospheric slab subducted beneath the northern Alxa Block, rendering a continental volcanic arc in the NLZ and also giving rise to extensive folding, thrusting, and crustal thickening. The crustal thickening in the NLZ may trigger the early Permian magmatic flare‐up that constructed much of the continental arc plutons. In the middle to late Permian, a retroarc foreland basin was formed, within which the Dahongshan Formation deposited. Significant active tectonic movements led to regional unconformity occurring during this period. A large‐scale dextral ductile shear deformation in the NLZ resulting from the lateral extrusion of the thickened crust after the terminal amalgamation of the southern CAOB was constrained between 272 and 249 Ma, suggesting a late Permian tectonic transition from compression to transpression. Combining these findings with published data, we suggest that the final consumption of the PAO occurred in the late Permian, probably along the Enger Us suture zone in the northern margin Alxa Block.

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Late Carboniferous to early Permian sedimentary–tectonic evolution of the north of Alxa, Inner Mongolia, China: Evidence from the Amushan Formation

Cited by 16 publications

References 17 publications

Provenance and tectonic setting of the Palaeozoic sediments in the northern Alxa area: Implications for the Central Asian Orogenic Belt

Provenance and tectonic setting of the Palaeozoic sediments in the northern Alxa area: Implications for the Central Asian Orogenic Belt

Geochemical characteristics and geological significance of Daohugou Formation at Ningcheng County of Inner Mongolia, Eastern China

Late Paleozoic Tectonic Evolution of the Paleo‐Asian Ocean in the Northern Alxa Block (NW China)

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