Neoproterozoic subduction-accretionary tectonics of the South Qinling Belt, China

Dong, Yunpeng; Sun, Shengsi; Yang, Zhao; Liu, Xiaoming; Zhang, Feifei; Li, Wei; Cheng, Bin; He, Dengfa; Zhang, Guowei

doi:10.1016/j.precamres.2017.02.015

Cited by 94 publications

(48 citation statements)

References 66 publications

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“…The SQB situated between the Shangdan and Mianlue Sutures comprises minor amphibolite facies metamorphosed Neoarchean‐Paleoproterozoic crystallized basement rocks and greenschist‐facies Neoproterozoic volcanic‐sedimentary transitional basement rocks (Dong et al, ). A series of Neoproterozoic granites intruded into these basements (Dong et al, , ; Dong, Zhang, Neubauer, et al, ; Hu et al, ). All these Precambrian basements and intrusions are overlain by the sedimentary cover composed of Cryogenian‐Ediacaran clastic and carbonate rocks, Cambrian‐Ordovician limestone, Silurian shale, and Devonian to Carboniferous sandstones with interlayered limestones.…”

Section: Geological Setting and Samplingmentioning

confidence: 99%

Paleomagnetic Constraints of the Lower Triassic Strata in South Qinling Belt: Evidence for a Discrete Terrane Between the North and South China Blocks

2020

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The paleoposition of the South Qinling Belt is a crucial key to understanding the collisional process between the North and South China blocks. In order to identify the paleogeography of the South Qinling Belt during the Early Triassic and its correlation to the North and the South China blocks, combined paleomagnetic studies have been conducted on the Lower Triassic sedimentary rocks in the South Qinling Belt. After systematic thermal demagnetization, a high-temperature characteristic remanence was isolated from 133 specimen embracing 22 sites with a mean direction of D = 330.5°, I = 27.7°(α 95 = 2.5°). The positive fold and reversal tests suggest that the characteristic remanence was acquired during deposition. This characteristic remanence corresponds to a mean paleopole at φ p = 7.2°E, λ p = 62.5°N (A 95 = 2.4°), indicating a paleolatitude of~23.6°N for the South Qinling Belt. These new data are in concordance with the coeval paleomagnetic pole of the North China Block but are distinctly different from that of the South China Block with~10.0°paleolatitude and~73.6°declination differences. Together with the regional geology, our new data suggest that the South Qinling Belt had amalgamated with the North China Block along the Shangdan Suture by the Early Triassic times; however, it was still separated from the South China Block by the Mianlue Ocean up to the Early Triassic. The final collision between the North and South China blocks resulted from a~73.6°clockwise rotation of the South China Block relative to the South Qinling Belt along the Mianlue Suture during the Late Triassic.Besides the Shangdan Suture representing the major boundary between the NCB and SCB, the Mianlue Suture has been recognized in the southern South Qinling Belt (SQB), leading to a composite model: an Early Devonian collision between the SQB and the NCB along the Shangdan Suture and a Triassic

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Section: Geological Setting and Samplingmentioning

confidence: 99%

Paleomagnetic Constraints of the Lower Triassic Strata in South Qinling Belt: Evidence for a Discrete Terrane Between the North and South China Blocks

2020

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“…The SQB chiefly consists of minor amphibolite facies metamorphosed Neoarchean to Paleoproterozoic basement rocks in the Douling, Yudongzi, and Tongbai‐Dabie areas, and Neoproterozoic subduction‐related volcanic‐sedimentary assemblages metamorphosed under greenschist facies conditions in the Wudangshan and Fenghuangshan areas (Figure ; Dong et al, ). The sedimentary cover unconformably overlaying the metamorphic basement is composed of the widespread Ediacaran–Paleozoic clastic and carbonate successions (G. W. Zhang et al, ).…”

Section: Geological Settingmentioning

confidence: 99%

Timing of Orogenic Exhumation Processes of the Qinling Orogen: Evidence From⁴⁰Ar/³⁹Ar Dating

et al. 2018

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The Qinling Orogenic Belt was formed by long-lived subduction and collision between the North and South China blocks. Our 40 Ar/ 39 Ar geochronological data of amphibole, white mica, and biotite reveal different exhumation and cooling histories of the major units in the North Qinling Belt and South Qinling Belt (SQB), constraining the multiple orogenic processes. The exhumation of the Qinling Group in the North Qinling Belt started before 432 Ma, through about 500°C during 432.3-405 Ma, followed by rapid cooling below 425°C at 388.9 ± 1.1 Ma and slow cooling through about 300°C during 333.3-329.5 Ma. A similar exhumation history of the Kuanping Group started from about 383 Ma, cooled below 425°C at 364.9 ± 1.2 Ma and 300°C at 341.8 ± 1.3 Ma. The metamorphic fore-arc sedimentary wedge cooled below 500°C during 322-311.2 Ma, below 425°C at 306.3 ± 2.8 Ma, and 300°C at 249 ± 2.8 Ma. However, the white mica 40 Ar/ 39 Ar ages of 349.4 ± 5.1 and 363.2 ± 2.5 Ma constrain the syntectonic metamorphic crystallization age of the Devonian Liuling Group in the northern SQB, whereas 228.2 ± 0.7 Ma indicates either a delayed cooling of the Wudang Group in the southern SQB or a second stage of low-temperature thermal overprint. Together with previous cooling ages and regional geology, our new data support a tectonic model of Early Paleozoic Andean-type orogeny with subsequent Late Paleozoic continental subduction in the Qinling Orogenic Belt. 40 Ar/ 39 Ar dating. Tectonics, 37, 4037-4067. https://doi.

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“…It is located between the North China Block (NCB) and the South China Block (SCB), and links the Dabie‐Sulu Orogen in the east, with the Kunlun and Qilian orogens to the west, represents a compound orogen formed through multi‐stage tectonic processes (Figure ; Ames, Zhou, & Xiong, ; Dong et al, ; Dong et al, ; Dong, Genser, Neubauer et al, ; Dong et al, ; Kröner, Zhang, Zhuo, & Sun, ; Li et al, ; Li, Zhao et al, ; Li, Jahn et al, ; Liu, Liu et al, ; Mattauer et al, ; Meng & Zhang, , ; Ratschbacher et al, ; Wu & Zheng, ; Zhai, Day, Hacker, & You, ; Zhang, Zhang, Yuan, & Xiao, ; Zhang, Dong et al, ). Therefore, the Qinling Orogen is not only an important target to decipher the tectonic evolution of China and East Asia but is also an ideal laboratory to study the geodynamics of subduction and collision (Bader et al, ; Dong et al, , ; Dong et al, ; Dong & Santosh, ; Li et al, , ; Li et al, ; Li et al, ; Li, Chen, Santosh, & Pirajno, ; Wang, Wang, Zhang, Pei, & Zhang, ; Zhang, Meng, & Lai, ; Zhang et al, ; Zheng, ).…”

Section: Introductionmentioning

confidence: 99%

“…. Therefore, the Qinling Orogen is not only an important target to decipher the tectonic evolution of China and East Asia but is also an ideal laboratory to study the geodynamics of subduction and collision (Bader et al, 2013;Dong et al, 2013Dong et al, , 2015Dong et al, 2017;Dong & Santosh, 2016;Li et al, 2009Li et al, 2016;Li, Chen, Santosh, & Pirajno, 2015;Wang, Wang, Zhang, Pei, & Zhang, 2003;Zhang, Meng, & Lai, 1995;Zhang et al, 1996;Zheng, 2012).…”

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A review of the Early Mesozoic granitoids in the Qinling Orogen: Implication for gold metallogeny

Yang

Tong

et al. 2017

Geological Journal

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The Qinling Orogen is located between the North China and South China blocks, and considered to form by the multiple accretionary processes, being also characterized by development of voluminous magmatic intrusions as well as abundant mineral resources. Here we compile the geological, geochemical and geochronological data of the Early Mesozoic granitoids from the Qingling Orogen and attempt to constrain the Early Mesozoic tectonic evolution and mechanism of gold mineralization in this region. The Early Mesozoic granitoids are most widespread in the Qinling Orogen, especially in western part, and can be classified into S‐, I‐, I‐A‐types, with the I‐type constituting the major variety. The isotopic ages of the three types granitoids are 200–222 Ma, 185–248 Ma, 210–227 Ma, respectively, indicating overlapping ages with a wide span of I‐type granitoids. The S‐, I‐, I‐A‐type granitoids show obvious zonation characteristics, that is the S‐type granitoids only occurred in southern South Qinling Belt, the I‐type granitoids are most widespread in the western Qinling Orogen, and the I‐A‐type granitoids are mainly exposed in the North Qinling Belt. The S‐type granitoids crystallized at relatively low temperature (800–850 °C) and deep‐crustal level (ca. 8 kb) and derived mainly from partial melting of a clay‐poor psammitic source. The I‐type granitoids formed at high temperature (>925 °C) and pressures above the garnet‐in phase boundary (>1.2 GPa) and derived from greywackes and partially igneous source. Moreover, the I‐A‐type granitoids probably derived from distinct sources with sufficient interaction, or common origin but underwent different degrees of crustal contamination, and generated at high temperatures (ca. 950 °C) and low pressures (1.0–0.2 GPa) conditions. These features indicate the Qinling Orogen experienced subduction, syn‐collisional, and post‐collisional during the Early Mesozoic, and also suggest the S‐, I‐, I‐A‐types granitoids underwent an episodic growth documenting the tectonic regime switchover at this stage. The gold deposits in the western Qinling Orogen can be classified as orogenic, Carlin‐type, and Carlin‐like gold deposits with the formation age of Late Triassic. The orogenic and Carlin‐type gold deposits have no genetic relation to granitic magmatism, but the Carlin‐like gold deposits is related to the synchronous magmatism. Combined with regional geology and metallogenic systems, we suggest that the multi‐stage Qinling Orogenesis resulted in the formation of the Early Mesozoic S‐, I‐, I‐A‐type granitoids and different types of gold deposits with some characteristic differences.

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Neoproterozoic subduction-accretionary tectonics of the South Qinling Belt, China

Cited by 94 publications

References 66 publications

Paleomagnetic Constraints of the Lower Triassic Strata in South Qinling Belt: Evidence for a Discrete Terrane Between the North and South China Blocks

Paleomagnetic Constraints of the Lower Triassic Strata in South Qinling Belt: Evidence for a Discrete Terrane Between the North and South China Blocks

Timing of Orogenic Exhumation Processes of the Qinling Orogen: Evidence From⁴⁰Ar/³⁹Ar Dating

A review of the Early Mesozoic granitoids in the Qinling Orogen: Implication for gold metallogeny

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Neoproterozoic subduction-accretionary tectonics of the South Qinling Belt, China

Cited by 94 publications

References 66 publications

Paleomagnetic Constraints of the Lower Triassic Strata in South Qinling Belt: Evidence for a Discrete Terrane Between the North and South China Blocks

Paleomagnetic Constraints of the Lower Triassic Strata in South Qinling Belt: Evidence for a Discrete Terrane Between the North and South China Blocks

Timing of Orogenic Exhumation Processes of the Qinling Orogen: Evidence From40Ar/39Ar Dating

A review of the Early Mesozoic granitoids in the Qinling Orogen: Implication for gold metallogeny

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Timing of Orogenic Exhumation Processes of the Qinling Orogen: Evidence From⁴⁰Ar/³⁹Ar Dating