Plastic flow of coesite eclogite in a deep continent subduction regime: Microstructures, deformation mechanisms and rheologic implications

Zhao, Zhong Yan; Wei, Chun Jing; Fang, Ai Min

doi:10.1016/j.epsl.2005.06.021

Cited by 25 publications

(21 citation statements)

References 40 publications

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“…According to an experimental study on the rheology of eclogite and harzburgite [193] , it is suggested that the detachment of the subducting crust component from the underlying upper mantle is only likely to happen in hot slow subducting slabs, but not the cold fast subducting GEOLOGY SPECIAL TOPICS FRONTIER lithosphere. From a detailed study on deformation microstructures of some eclogite mylonites from a ductile shear complex in the Sulu orogen, Zhao et al [194] found that dislocation creep is the predominant deformation mechanism, providing insight into plastic flow of coesite-phase eclogite in the continental deep-subduction zone. According to comparison of surface geology and CCSD samples, Xu et al [38] recognized fold-overthrust structure and a ductile shear zone within the orogenic crust at CCSD sites ( Figure 18).…”

Section: Lithospheric Architecture Of Collision Orogenmentioning

confidence: 98%

A perspective view on ultrahigh-pressure metamorphism and continental collision in the Dabie-Sulu orogenic belt

2008

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Section: Lithospheric Architecture Of Collision Orogenmentioning

confidence: 98%

A perspective view on ultrahigh-pressure metamorphism and continental collision in the Dabie-Sulu orogenic belt

2008

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“…D00 occurred in amphibolite-facies during the pre-orogenic subduction, and is only preserved in the inclusions of porphyroblasts. The D0 deformation took place in eclogite-facies, preserved in the eclogite-facies units or blocks such as eclogite-facies sheath folds in the Bixiling of the eastern Dabie Orogen showing that they have omphacite lineations parallel to fold axes (Figure 4a), and the Yangkou Bay Block of the Sulu Orogen (Zhao et al, 2005;Li et al, 2009aLi et al, , 2009bLi et al, , 2010a. Based on the similarity of kinematics of lineations of omphacite of D0 and amphibole of the D1 and D2 deformation, D0, D1 and D2 structures have similar kinematics of southwestward motion (Li et al, 2009a(Li et al, , 2010a.…”

Section: Geological Settingmentioning

confidence: 99%

Not all folds and thrusts in the Yangtze foreland thrust belt are related to the Dabie Orogen: Insights from Mesozoic deformation south of the Yangtze River

Zhao

Zhang

et al. 2010

Geological Journal

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The Yangtze foreland fold-and-thrust belt is located between the Mesozoic Dabie collisional orogen and the Mesozoic Jiangnan intraplate orogen in east-central China. Three regional deformation events are recognized in the Dabie Orogen north of the Yangtze River. The earliest regional deformation (D1) corresponded to a southeastward compression that occurred during the subduction of the South China Plate below the North China Plate. Top-to-the-southeast shearing coeval with Late Permian-Early Triassic blueschist facies metamorphism, was possibly associated with the development of regional gneissosity in the Dabie complexes and flat-ramp-style thrusts within the NeoproterozoicPalaeozoic sedimentary cover, north of the Yangtze River. The main ductile deformation (D2) is also characterized by southeast-verging overturned and recumbent folds, coeval with the early stage of exhumation of the high-pressure rocks. A top-to-the-SW thrusting and WNWstriking open folds belong to a separate, later deformation phase, D3. Previous 40 Ar-39 Ar mica dates ranging between 245 and 205 Ma suggest Late Permian-Early Jurassic ages for the D1 to D3 events. The foreland folds and thrusts related to these deformations in the Dabie Orogen flank the eastern and western 'limbs' of the Dabie Orogen but are absent in the front of it. In contrast to the deformation north of the Yangtze River, the deformation of Neoproterozoic-Palaeozoic sedimentary cover in the Jiangnan Orogen south of the Yangtze River is generally characterized by north-verging folding and top-to-the-north thrusting from Triassic to Jurassic times. Based on the differences of deformation and structural polarity between the south and north areas of the Yangtze River, we propose that the Yangtze foreland fold-and-thrust belt in the direct front of the Dabie Orogen is unrelated to the Dabie Orogen but resulted from the Jiangnan Orogen.

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“…Early Cretaceous granitoids (c. 130 Ma, U -Pb zircon data, Xue et al 1997;Hacker et al 1998;Ratschbacher et al 2000) intruded all these units, including supracrustal sediments and high-grade migmatites. Contemporaneously, mafic to ultramafic igneous rocks were interpreted to have been generated by partial melting of metasomatized mantle (Jahn et al 1999) or remelting of subducted lithosphere (Zhao et al 2005).…”

Section: Geological Setting and Samplesmentioning

confidence: 99%

⁴⁰ Ar/ ³⁹ Ar Thermochronology on Central China Orogen: Cooling, uplift and implications for orogeny dynamics

Wang

Zhu

Hou

et al. 2013

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40 Ar/ 39 Ar geochronology was carried out on the non-deformed synorogenic granitoid plutons from the Qinling-Dabie Orogen. The new model cooling history (MCH) method is applied to K-feldspar to obtain information about its cooling history. MCH is a quicker and easier method of calculating cooling histories compared with the multi-domain diffusion (MDD) model. Cooling histories indicate that Qinling-Dabie suffered differential uplift and denudation processes since the collision in the Late Triassic. East Qinling uplifted and denuded rapidly from c. 181-187 to c. 150 Ma at a rate of c. 20 8C Ma 21 , three times as fast as west Qinling which was exhumed at a rate of c. 6.6 8C Ma 21 from c. 195-190 to c. 100 Ma. Although west and east Qinling started uplift and denudation at the same time, east Qinling reached the 150 8C geothermal line (c. 7.5 km deep) at c. 150 Ma, earlier than west Qinling by c. 50 myr, suggesting that earliest collision and strongest compression occurred in east Qinling. Dabie is characterized with a polyphased process of uplift and denudation, implying that the subduction of south China block in this region was multi-staged. The emplacement of the granitoids and uplift pattern along Qinling-Dabie may be due to delamination of the root of the mountains or the slab break-off. Cooling histories suggest that more mass had been removed from the root of east Qinling than west Qinling and Dabie; the final delamination occurred in Dabie at c. 100 Ma but affected the whole Qinling-Dabie orogen.

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Plastic flow of coesite eclogite in a deep continent subduction regime: Microstructures, deformation mechanisms and rheologic implications

Cited by 25 publications

References 40 publications

A perspective view on ultrahigh-pressure metamorphism and continental collision in the Dabie-Sulu orogenic belt

A perspective view on ultrahigh-pressure metamorphism and continental collision in the Dabie-Sulu orogenic belt

Not all folds and thrusts in the Yangtze foreland thrust belt are related to the Dabie Orogen: Insights from Mesozoic deformation south of the Yangtze River

⁴⁰ Ar/ ³⁹ Ar Thermochronology on Central China Orogen: Cooling, uplift and implications for orogeny dynamics

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Plastic flow of coesite eclogite in a deep continent subduction regime: Microstructures, deformation mechanisms and rheologic implications

Cited by 25 publications

References 40 publications

A perspective view on ultrahigh-pressure metamorphism and continental collision in the Dabie-Sulu orogenic belt

A perspective view on ultrahigh-pressure metamorphism and continental collision in the Dabie-Sulu orogenic belt

Not all folds and thrusts in the Yangtze foreland thrust belt are related to the Dabie Orogen: Insights from Mesozoic deformation south of the Yangtze River

40 Ar/ 39 Ar Thermochronology on Central China Orogen: Cooling, uplift and implications for orogeny dynamics

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⁴⁰ Ar/ ³⁹ Ar Thermochronology on Central China Orogen: Cooling, uplift and implications for orogeny dynamics