Journal ArticleDOI
Crustal structure of the southern Dabie ultrahigh‐pressure orogen and Yangtze foreland from deep seismic reflection profiling
Shuwen Dong,Rui Gao,Bolin Cong,Zhongyan Zhao,Xiaochun Liu,Sanzhong Li,Qiusheng Li,Dongding Huang +7 more
TLDR
A 140km-long seismic reflection profile provided a high-resolution crustal-scale image of the southern Dabieshan high-pressure (HP) metamorphic belt and the Yangtze foreland fold-and-thrust belt as discussed by the authors.Abstract:
A new 140-km-long seismic reflection profile provides a high-resolution crustal-scale image of the southern Dabieshan high-pressure (HP) metamorphic belt and the Yangtze foreland fold-and-thrust belt. The seismic image of the stacked section shows that the southern Dabieshan metamorphic terrane and Yangtze foreland belt are separated by a large north-dipping fault. In the foreland the upper crust is dominated by a series of folds and thrusts formed during the collisional stage in the mid-Triassic; it was reworked by crustal extension resulting in the formation of a late Jurassic and Cretaceous red-bed basin. The southern Dabieshan profile shows stacked crustal slabs developed along the margin of the collisional orogenic belt. The Moho reflectors at 10–11 s (∼30–33 km) are seismically prominent and segmented by a number of south-verging thrusts that were probably developed by foreland-directed thrusting of the deeply subducted continental crust during exhumation. The seismic reflection profile suggests that structures related to the Triassic–Jurassic subduction and exhumation of the Yangtze plate are preserved despite the severe crustal extension superimposed during the late Mesozoic and Cenozoic.read more
Citations
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Journal ArticleDOI
A perspective view on ultrahigh-pressure metamorphism and continental collision in the Dabie-Sulu orogenic belt
TL;DR: In this paper, the Dabie-Sulu orogenic belt in China crops out the largest lithotectonic unit containing ultra-high-pressure metamorphic rocks in the world.
Journal ArticleDOI
Delamination/thinning of sub-continental lithospheric mantle under eastern china: the role of water and multiple subduction
TL;DR: In this article, a new model was proposed to explain why the Archean sub-continental lithospheric mantle under the Eastern Block of the North China Craton (NCC) delaminate or thin so drastically in the Cretaceous.
Journal ArticleDOI
Jurassic Tectonic Revolution in China and New Interpretation of the “Yanshan Movement”
Dong Shuwen,Zhang Yueqiao,Long Changxing,Yang Zhenyu,Ji Qiang,Wang Tao,HU Jianming,Chen Xuanhua +7 more
TL;DR: In this article, the authors defined the Yanshan movement as the Late Jurassic East Asian multi-directional plate convergent tectonic regime and its associated extensive intracontinental orogeny and great change that started at ˜165±5 Ma.
Journal ArticleDOI
Triassic southeastward subduction of North China Block to South China Block: Insights from new geological, geophysical and geochemical data
Sanzhong Li,Bor-ming Jahn,Bor-ming Jahn,Shujuan Zhao,Liming Dai,Xiyao Li,Yanhui Suo,Lingli Guo,Yongming Wang,Xiaochun Liu,Haoyuan Lan,Zaizheng Zhou,Qiliang Zheng,Pengcheng Wang +13 more
TL;DR: In this paper, a new and revolutionary tectonic model was proposed to explain the distribution and exhumation of high pressure (HP)-ultra-high pressure (UHP) metamorphic rocks of the Dabie-Sulu Belt.
Journal ArticleDOI
Intracontinental deformation in a frontier of super-convergence: A perspective on the tectonic milieu of the South China Block
TL;DR: In this paper, a comparison of the intensive contraction of the South China Block with the distinct features of rifting of the North China Block, brings out the contrasting structural and tectonic signatures developed in the same frontier of one of the largest superconvergent systems on the globe during the Mesozoic to Cenozoic.
References
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Journal ArticleDOI
Coesite and pure pyrope in high-grade blueschists of the Western Alps: a first record and some consequences
TL;DR: A pyrope-quartzite originally described by Vialon (1966) from the Dora Maira massif was resampled and reinvestigated in this article, showing that the whole matrix has once been coesite.
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Diamond inclusions in garnets from metamorphic rocks: a new environment for diamond formation
TL;DR: In this article, the authors reported the occurrence of diamonds in situ in crustal rocks: highly retrograded high-pressure metamorphic garnet-pyroxene and pyroxene-carbonate-garnet rocks, biotite gneisses and schists from the Kokchetav massif, northern Kazakhstan, USSR.
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Diamond from the Dabie Shan Metamorphic Rocks and Its Implication for Tectonic Setting
TL;DR: The diamonds and diamondiferous rocks of Dabie Shan are interpreted to be the products of ultrahigh pressure metamorphism in the und�rthrust basement of the Yangtze continental plate during the early Mesozoic, at greater than 4.0 gigapascals and 900�C.
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Coesite in clinopyroxene in the Caledonides and its implications for geodynamics
TL;DR: Coesite was reported for the first time from the Caledonide orogen as discussed by the authors, and it occurs as inclusions in clinopyroxene in the dolomite-eclogite at Grytting, Norway, and provides valuable new evidence to support the hypothesis of extremely high pressure in certain Norwegian eclogites.
Journal ArticleDOI
Exhumation of ultrahigh-pressure continental crust in east central China: Late Triassic-Early Jurassic tectonic unroofing
Bradley R. Hacker,Lothar Ratschbacher,Laura E. Webb,Michael McWilliams,Trevor Ireland,Andrew J. Calvert,Shuwen Dong,Hans-Rudolf Wenk,Daniel Chateigner +8 more
TL;DR: The largest tract of ultrahigh pressure rocks, the Dabie-Hong'an area of China, was exhumed from 125 km depth by a combination of normal-sense shear from beneath the hanging wall Sino-Korean craton, southeastward thrusting onto the footwall Yangtze craton and orogen-parallel eastward extrusion as discussed by the authors.