The 40Ar/39Ar geochronology constraint and geological significance of mylonites in Shangyi-Chicheng fault belt on the north of North China Craton

Hu, Ling; Honglin, Song; Yan, Dan‐Ping; Hu, Daogong

doi:10.1360/02yd0439

Cited by 24 publications

(15 citation statements)

References 3 publications

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“…40 Ar/ 39 Ar dating of the syndeformational biotites and hornblends from the thrust ductile shear zone identified the late Permian (ca. 263 Ma) [36] and Middle Jurassic (163 Ma) [35]. The synkinematic sedimentation features and deformations of the foredeep sequences in front of the thrust system [37][38][39][40][41] imply that they underwent south-directed brittle thrusting during and after the sedimentation of the Tuchengzi Formation in the Late Jurassic.…”

Section: Large-scale Basement-involved Thrust Tectonicsmentioning

confidence: 99%

“…The ductile thrust shear zone along the Shangyi-ChongliChicheng fault in the western part of the Yanshan indicates deep crust contraction deformations [28,33,35,36]. In addition, large-scale overturned folds or fold nappes and ductile thrust shear zones have been recognized in the central part of the Yanshan belt, north of Beijing, as basement-involved Sihetang fold nappe tectonics and Sihetang ductile shear zones [77], respectively.…”

Section: Large-scale Overturned Folds and Ductile Thrust Tectonicsmentioning

confidence: 99%

“…The ductile thrusting deformation of the amphibolite facies along the Shangyi-Chicheng fault zone in the latest Paleozoic and Middle Jurassic [33][34][35][36] together with the Sihetang ductile shear thrusting in late Mesozoic [77,78] indicate that the crust thickness involved in the contraction deformations in the Yanshan belt is around 20-25 km. Based on the shortening rate in the central Yanshan belt described above, it is estimated that the crust thickness after the contraction deformations was about 47-50 km (Table 3), which is similar to the crust thickness required by the tectonic model for lower crust eclogitization [17,104,105].…”

Section: Crust Thickening Caused By Contraction Deformationsmentioning

confidence: 99%

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Mesozoic contraction deformation in the Yanshan and northern Taihang mountains and its implications to the destruction of the North China Craton

Zhang

Deng

et al. 2011

Sci. China Earth Sci.

103

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Mesozoic contraction deformation in the Yanshan and Taihang mountains is characterized by basement-involved thrust tectonics, basement-cored buckling anticlines and ductile thrust and nappe tectonics. Most of these deformations are orientated west-east, west-northwest and northeast to north-northeast. The contraction deformations began in the Permian, continued through the Triassic and Jurassic and terminated in the Early Cretaceous, and constitute an important part of the destruction of the North China Craton. It is estimated, from balanced cross-section reconstructions, that the north-south shortening of the central part of the Yanshan belt before 135 Ma was around 38%. The initial crust thickness, pre-dating the major contraction deformation in late Paleozoic and early Mesozoic, was estimated to be around 35 km based on paleogeographic characteristics. Assuming that the inferred depth of ductile thrusting deformation, 20-25 km, was the crust thickness involved in the contraction deformation, and also assuming that the N-S contraction deformation was accommodated by vertical crust thickening, the thickness of the crust after the contraction deformation was expected to be around 47-50 km. This was the approximate crust thickness required for the eclogitization of the lower crust for delamination. The gravity potential accumulated by the isostatic uplift of the thickened crust, together with the decrease in crustal strength caused by the coeval magmatisms associated with the contraction deformation, led to the subsequent extensional collapse of the middle and upper crust although the regional stress regime associated with the plate interactions remained constant. It is inferred that the Mesozoic contraction deformations in the Yanshan and Taihang mountains were not only a significant tectonic process contributing to the destruction of the craton in middle and upper crust but also stimulated delamination at a deep level and the extension of the shallow crust. In other words, both the suspected delamination of the lower crust and upper mantle and the well constrained extension deformations of the shallow crust in the eastern North China Craton during the late Mesozoic are a consequence of crust thickening due to previous contractions. Extensional deformations could be expected to occur independently in the shallow crust, and are not necessarily associated with or responding to delamination at a deep level.

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Section: Large-scale Basement-involved Thrust Tectonicsmentioning

confidence: 99%

Section: Large-scale Overturned Folds and Ductile Thrust Tectonicsmentioning

confidence: 99%

Section: Crust Thickening Caused By Contraction Deformationsmentioning

confidence: 99%

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Mesozoic contraction deformation in the Yanshan and northern Taihang mountains and its implications to the destruction of the North China Craton

Zhang

Deng

et al. 2011

Sci. China Earth Sci.

103

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“…For instance, the Chicheng-FengningLonghua Fault (Fig. 8a) in the south shows two phases of ductile dextral shearing, which are Middle Permian-Early Triassic (263-243 Ma) and Late Triassic (237-233 Ma;Hu et al, 2003;Wang et al, 2013) in age, followed by a brittle episode in the Jurassic (Faure et al, 2012).…”

Section: Triassic Strike-slip Fault System At the Northern Margin Of mentioning

confidence: 99%

A new Triassic shortening-extrusion tectonic model for Central-Eastern Asia: Structural, geochronological and paleomagnetic investigations in the Xilamulun Fault (North China)

Zhao

Faure

Chen

et al. 2015

Earth and Planetary Science Letters

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International audienceAt the northern margin of the North China Block (NCB), the Xilamulun Fault (XMF) is a key belt to decipher the tectonic evolution of Central-Eastern Asia, as it records the Paleozoic final closure of the Paleo-Asian Ocean, and localizes a Late Triassic intracontinental deformation. In this study, structural analysis, 40Ar–39Ar dating, and paleomagnetic studies were performed to investigate the kinematics of the XMF and to further discuss its Triassic geodynamic significance in the Central-Eastern Asia framework after the Paleozoic Central Asian Orogenic evolution. The structural analyses reveal two phases of ductile deformation. The first one (D1), which displays N-verging and E–W trending folds, is related to the Early Paleozoic collisional event between the NCB and the Songliao–Hunshandake Block (SHB). The second phase (D2) displays a high-angle foliation and a pervasive sub-horizontal E–W stretching lineation with kinematic criteria indicative of dextral strike–slip shearing. The 40Ar–39Ar dating on mylonitic granite places the main shearing event around 227–209 Ma. This D2 shearing is coeval with that of the dextral strike–slip Bayan Obo–Chifeng Fault (BCF) and the Chicheng–Fengning–Longhua Fault to the south, which together constitute a dextral shearing fault system on the northern margin of the NCB during the Late Triassic. The paleomagnetic study performed on the Middle Permian Guangxingyuan pluton, located between the XMF and BCF, documents a local clockwise rotation of this pluton with respect to the NCB and SHB. Our multidisciplinary study suggests an NNW–SSE shortening and strike–slip shearing dominated tectonic setting on the northern margin of the NCB during the Late Triassic. Combining the contemporaneous dextral strike–slip movements of the XMF and BCF in northern China and the sinistral strike–slip movement of East Gobi Fault (EGF) in southeastern Mongolia with the large-scale tectonic framework, a Late Triassic NNW–SSE shortening-eastward extrusion tectonic model for Central-Eastern Asia is firstly proposed. The NNW–SSE shortening results in the eastward extrusion of the continental wedge bounded by the BCF and EGF, which is accommodated by the different kinematic patterns of the southern (XMF and BCF) and northwestern (EGF) bounding faults. This shortening-extrusion tectonic framework is tentatively interpreted as the result of the far field forces associated with three Late Triassic lithosphere-scale convergences in East Asia: i) northward intracontinental subduction between the NCB and South China Block, ii) collision of the Qiangtang Block with the Qaidam Block, and iii) southward subduction of the Mongol–Okhotsk Ocean beneath the Mongolia Block

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“…The northern part of the North China Craton (NCC) was a convergent plate margin during the Paleozoic and experienced a metacratonization process associated with the closure of the Paleo-Asian Ocean in the Central Asian orogenic belt (CAOB), mainly in the form of multiple episodes of Paleozoic magmatism (Zhang and Zhai, 2010) and structural deformations (Cui et al, 2002;Hu et al, 2003;Wan, 2012;Zhang et al, 2005). A number of recent studies have been conducted to establish the sequence of these magmatic events and to resolve their tectonic affiliation with evolving orogenic processes in the neighboring orogenic belt (Chen et al, 2009;S.H.…”

Section: Introductionmentioning

confidence: 99%

Late Permian appinite–granite complex from northwestern Liaoning, North China Craton: Petrogenesis and tectonic implications

Zhang

Xue

Yuan

et al. 2012

Lithos

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The 40Ar/39Ar geochronology constraint and geological significance of mylonites in Shangyi-Chicheng fault belt on the north of North China Craton

Cited by 24 publications

References 3 publications

Mesozoic contraction deformation in the Yanshan and northern Taihang mountains and its implications to the destruction of the North China Craton

Mesozoic contraction deformation in the Yanshan and northern Taihang mountains and its implications to the destruction of the North China Craton

A new Triassic shortening-extrusion tectonic model for Central-Eastern Asia: Structural, geochronological and paleomagnetic investigations in the Xilamulun Fault (North China)

Late Permian appinite–granite complex from northwestern Liaoning, North China Craton: Petrogenesis and tectonic implications

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