Early Triassic initial collision between the North China and South China blocks in the eastern Qinling Orogenic Belt

Ma, Qiang; Yang, Jianghai; Du, Yu; Dai, Xianduo; Chai, Rong; Guo, Huaming; Xu, Yajun

doi:10.1016/j.tecto.2021.228965

Cited by 13 publications

(19 citation statements)

References 106 publications

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“…Separately located at the Middle Yangtze and Upper Yangtze regions, the Xiakou section and the Chaohu section recorded different sequences of sedimentary rocks, and studies indicated that late Early Triassic conodont was much more enriched in the Chaohu area (Zhao et al, 2007(Zhao et al, , 2008(Zhao et al, , 2013. Hence, as nektonic organisms lived in multiple water depths (Chen et al, 2021;Sun et al, 2012), the different conodont results from the two sections were also controlled by the complex tectonic and sedimentary evolution history which further resulted in different conodont features (Ma et al, 2021). Original diagnosis (from Koike, 1998): Neostrachanognathus is characterized by a quadrimenbrate apparatus composed of an adenticulated (Figure 6a, M elements) and three denticulated nongeniculate coniform elements (Figure 6a, Sa, Sb and Sc elements).…”

Section: Resultsmentioning

confidence: 99%

“…Located at the north edge of the Middle Yangtze Platform (Figure 1b), the NYF was recorded in medium-to thick-bedded limestone or argillaceous limestone as well as thick-bedded dolostone of the upper Jialingjiang Formation (Benton et al, 2013;Li et al, 2002;Yan et al, 2021). Owing to the complex sedimentary background of the Daye and Jialingjiang formations, regional Lower Triassic sequences from the Hubei Province have variable sequence records (Wu et al, 2020), and different opinions about the divisions of these two formations remained, especially for the Jialingjiang Formation (Ma et al, 2021;Yan et al, 2021). After systematic fieldwork in the Nanzhang-Yuan'an area, Yan et al (2021) reclassified the Jialingjiang Formation in this area.…”

Section: Geological Setting and Lithostratigraphymentioning

confidence: 99%

“…Overlying part III, part IV of the Zhangjiawan section is composed of "green bean"-like ash bed, sandstone, argillaceous limestone and dolomite (Figure 4i). The GBR is characterized by greenish or yellowish-green tuff containing prominent bean-like F I G U R E 2 (a) Geological map of the Huangling Dome area (Ma et al, 2021) and (b) locations of the studied sections. YDH, Yanduhe section; ZJW, Zhangjiawan section.…”

Section: Geological Setting and Lithostratigraphymentioning

confidence: 99%

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A unique early Triassic (Spathian) conodont community from the Nanzhang‐Yuan'an Fauna, Hubei Province, South China

Zou

et al. 2023

Geological Journal

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The largely stagnant marine ecosystem following the Permian–Triassic mass extinction (PTME) was superseded by the appearance of marine reptiles. One of the most abundant Early Triassic (Spathian) marine reptile faunas occurs in the Nanzhang‐Yuan'an area of Hubei Province, South China, and provides remarkable information for understanding biotic recovery after the PTME. Situated on the north edge of the Middle Yangtze Platform in South China, the well‐exposed Zhangjiawan stratigraphic succession in Yuan'an County represents one of the most productive sections, yielding abundant marine reptiles. Intensive sampling of this section reveals a unique conodont community both before and during the emergence of the Nanzhang‐Yuan'an Fauna (NYF). Occurrences of Neostrachanognathus tahoensis below the NYF and deposition of ʻGreen Bean Rock (GBR)ʼ above the NYF restricted this fauna to the latest Early Triassic. Except for the coniform Neostrachanognathus, this conodont community consists of abundant Ellisoniidae characterized by ramiform P1 elements. Foraminifers and fish found together with the conodont elements form other low‐level parts of the local food web. Other temporally coincident sections nearby, for example, the Yanduhe section of western Hubei Province, yield only rare conodonts. Hence, the unique conodont community from the Zhangjiawan section suggests that the Nanzhang‐Yuan'an area might be a “refuge area” for the Early Triassic marine ecosystem, or at least for the marine reptiles and the conodont communities. Although the direct connection between conodonts and marine reptiles is still uncertain, low‐level consumers—conodont animals‐played important roles in the food webs of NYF. The collision of the South China and North China blocks removed this “refuge area” and witnessed the disappearance of endemic Hupeisuchians.

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Section: Resultsmentioning

confidence: 99%

Section: Geological Setting and Lithostratigraphymentioning

confidence: 99%

Section: Geological Setting and Lithostratigraphymentioning

confidence: 99%

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A unique early Triassic (Spathian) conodont community from the Nanzhang‐Yuan'an Fauna, Hubei Province, South China

Zou

et al. 2023

Geological Journal

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“…Li et al, 2015;Roger et al, 2008Roger et al, , 2011Yan et al, 2018). The Paleo-Tethys Ocean closed between the North and South China blocks via a scissor-like movement involving oblique subduction and collision propagating toward the NNW (Ma et al, 2021;Xue et al, 2021). Thus, the A'nyemaqen-Mianlue suture zone consists of several north-dipping thrust faults with rock slices that were deformed into a broad salient by the southward extrusion of the Bikou, Micang Shan, and Daba Shan thrust belts (Figure 1a; Ma et al, 2021;J.…”

Section: Regional Geologymentioning

confidence: 99%

Multi‐Phase Non‐Coaxial Orogenic Growth: Propagation of the Longmen Shan Thrust Belt on the Eastern Margin of the Tibetan Plateau

Zhou,

Yan,

Qiu

et al. 2023

Tectonics

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Reconstructing the deformation sequence and strain history of the Longmen Shan thrust belt (LSTB) has significant implications for the growths of the SW Qinling orogenic belt and the Tibetan Plateau. However, the Mesozoic–Cenozoic propagation of the LSTB remains poorly understood owing to weak constraints on strain variations. We conducted a comprehensive structural investigation and made measurements of anisotropy of magnetic susceptibility along the entire LSTB. Magnetic fabrics are represented by prevalent layer‐parallel shortening (LPS) fabrics, intersection lineation fabrics, and folding fabrics with magnetic lineations trending NE–SW, WSW–ENE, NW–SE, and N–S, corresponding to four compressional deformations. AMS results and structural analyses, revealed four phases of deformation (D1, D2, D3, and D4) that were characterized respectively by top‐to‐the‐SSE thrusting in the northern LSTB at >219–164 Ma, top‐to‐the‐SW thrusting in the central‐northern LSTB at >201–164 Ma, top‐to‐the‐SE thrusting of the LSTB at 125–5 Ma, and top‐to‐the‐east thrusting at 5–0 Ma in the LSTB. D1, D3, and D4 LPS fabrics exhibit a strain evolution that progressed from incipient deformation to pencil structure to cleavage fabrics, corresponding to moderately oblate, prolate, and oblate strain ellipsoids, respectively. The intersection lineation fabrics imply a hinterland‐ward progression from LPS fabrics to cleavage‐controlled fabrics and non‐coaxial superimposition of D2 on D1. Therefore, the early Mesozoic LSTB developed owing to the superimposition of D2 on D1 being non‐coaxial, likely suggesting southward growth of the SW Qinling orogenic belt, whereas the modern LSTB was formed by the superimposition of D4 on D3, implying non‐coaxial eastward growth of the Tibetan Plateau.

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“…Triassic orogenesis in the Qinling Orogenic Belt is not only supported by the evidence of magmatic petrology [6], but also by metamorphic petrology [7][8][9] and sedimentary petrology [10][11][12]. However, there is no consensus on when the Mianlue Ocean began to subduct after the Silurian rifting.…”

Section: Introductionmentioning

confidence: 99%

Late Paleozoic Tectonic Evolution of the Qinling Orogenic Belt: Constraints of Detrital Zircon U-Pb Ages from the Southern Margin of North China Block

et al. 2022

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The tectonic evolution of the Qinling Orogenic Belt in the Late Paleozoic has long been controversial, especially due to the limitation of the Mianlue Ocean subduction time. Basin formation and sedimentary development in the southern North China Block are closely related to the tectonic evolution of the Qinling Orogenic Belt, which is an effective entry point to study basin–mountain interaction. We present new detrital zircon U–Pb data from the Shihezi Formation in the Luonan area in the southern margin of the North China Block. The results show that the bottom sample has two major peaks at 288 Ma and 448 Ma, with weak peaks at 908, 1912 Ma and 2420 Ma. The top sample has one major peak at 297 Ma, with weak peaks at 1933 Ma and 2522 Ma. Combined with the published paleocurrent data and lithofacies paleogeography, the sediments of the bottom sample were sourced from the North Qinling Belt, Inner Mongolia Palaeo-Uplift and the basement of the North China Block. The top sample originated mainly from the Inner Mongolia Palaeo-Uplift and the basement of the North China Block. Comparing the obtained zircon U-Pb ages with the published relevant data in the North China Block, it is found that the provenance area shifted from the Qinling Orogenic Belt to the Inner Mongolia Paleo-Uplift in the Late Carboniferous–Permian, and the Qinling Orogenic Belt could hardly provide provenance for the southern North China Block in the Middle Permian. The uplift of the Qinling Orogenic Belt in the Late Carboniferous may be the continuation of Caledonian orogeny in the Early Paleozoic, whereas the uplift of the Inner Mongolia Palaeo-Uplift is related to the tectonic evolution of the Central Asian Orogenic Belt during the Late Paleozoic. This tectonic transformation occurred when the Qinling Orogenic Belt no longer supplied sediments to the southern North China Block in the Middle Permian, and the Mianlue Ocean subduction did not occur until at least the Late Permian.

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Early Triassic initial collision between the North China and South China blocks in the eastern Qinling Orogenic Belt

Cited by 13 publications

References 106 publications

A unique early Triassic (Spathian) conodont community from the Nanzhang‐Yuan'an Fauna, Hubei Province, South China

A unique early Triassic (Spathian) conodont community from the Nanzhang‐Yuan'an Fauna, Hubei Province, South China

Multi‐Phase Non‐Coaxial Orogenic Growth: Propagation of the Longmen Shan Thrust Belt on the Eastern Margin of the Tibetan Plateau

Late Paleozoic Tectonic Evolution of the Qinling Orogenic Belt: Constraints of Detrital Zircon U-Pb Ages from the Southern Margin of North China Block

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