Abstract
The Hongzhen metamorphic core complex is situated in the Yangtze plate to the east of the Dabie orogenic belt. Its ductile detachment zone in the foot wall overprints on the metamorphic complex of the Proterozoic Dongling Group. The present profile of the ductile shear zone with consistent SW-dipping mineral elongation lineation shows antiform and reversed S-shape from northeast to southwest respectively. Exposure structures, microstructures and quartz C-axis fabric all indicate top-to-SW movement for the ductile shear zone. Recrystallisation types of quartz and feldspar in the mylonites demonstrate that the shear zone was developed under the amphibolite facies condition and at mid-crust levels. The metamorphic core complex formed in the Early Cretaceous with a muscovite plateau age of 124.8±1.2 Ma. Regional NE-SW extension along a SW-dipping, gentle detachment zone was responsible for formation of the core complex. Intrusion of the Hongzhen granite with a biotite plateau age of 124.8±1.2 Ma rendered the ductile shear zone curved, uplifted and final localization of the core complex. The Hongzhen metamorphic core complex suggests that the Early Cretaceous magmatism in this region took place under the condition of regional extension and the eastern Yangtze plate also experienced lithospheric thinning.
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Luo Q K, Liu G S, Wang B. The study of metamorphic core complex of Hongzhen near Anqing in the lower Yangtze area. J Nanjing Univ (Earth Sciences, in Chinese), 1992, 4(2): 14–25
Li D W. Geological characteristics and metallogenic significance of Hongzhen metamorphic core complex, Anhui, Geotect Metall (in Chinese), 1993, 17(3): 211–220
Dong S W, He D L, Shi Y H. Structural characteristics and emplacement mechanism of granitoid in Dongling, Anhui. China. Sci Geol Sin (in Chinese), 1993, 28(1): 10–20
Xu Y G. Thermo-tectonic destruction of the Archaean lithospheric keel beneath the Sino-Korean craton in China: timing and mechanism. Phys Chem Earth (A), 2001, 26(9–10): 747–757
Gao S, Rudnick R L Carlson R W, et al. Re-Os evidence for replacement of ancient mantle lithosphere beneath the North China craton. Earth Plane Sci Lett, 2002, 198: 307–322
Zhang H F, Sun M, Zhou X H, et al. Lithosphere destruction beneath the North China craton: evidence from major, trace, and Sr-Nd-Pb isotope studies of Fangcheng basalts. Contrib Mineral Petrol, 2002, 144: 241–253
Zhai M G, Zhu R X, Liu J M, et al. Time range of Mesozoic tectonic regime inversion in eastern North China Block. Sci in China Ser D-Earth Sci, 2004, 47(2): 151–159
Ratschbacher L, Hacker B R, Webb L E, et al. Exhumation of the ultrahigh-pressure continental crust in east central China: Cretaceous and Cenozoic unroofing and the Tan-Lu fault zone. J Geophys Res, 2000, 105(B6): 13303–13338
Fan W M, Guo F, Wang Y J, et al. Post-orogenic bimodal volcanism along the Sulu orogenic belt in eastern China. Phys Chem Earth (A), 2001, 26: 133–146
Wu F Y, Lin J Q, Wilde S A, et al. Nature and significance of the Early Cretaceous giant igneous event in eastern China. Earth Plane Sci Lett, 2005, 233: 103–119
Zhang Q, Li C D, Wang Y, et al. Mesozoic high-Sr and Low-Yb granitoids and low-Sr and high-Yb granitoids in eastern China: comparison and geological implications. Acta Petrol Sin, 2005, 21(6): 1527–1537
Liu J L, Guan H M, Ji M, et al. Metamorphic core complexes of late Mesozoic in the North China Block and their constraint on lithospheric thinning. Prog Nat Sci, 2006, 16(1): 21–26
Schmid J C, Ratschbacher L, Hacker B R, et al. How did the foreland react? Yangtze foreland fold-and thrust belt deformation related to exhumation of the Dabie Shan ultrahigh-pressure continental crust (eastern China). Terra Nova, 1999, 11: 266–272
Zhu G, Wang D X, Liu G S, et al. Extensional activities of the Tan-Lu fault zone and its geodynamic setting. Chinese J Geol (in Chinese), 2001, 36(3): 269–278
Hou M J, Wang Y M, Mercier J, et al. Dynamic evolution and tectonic significance of the Tanlu fault zone (Anhui segment). Geol Bull Chin (in Chinese), 2003, 22(2): 105–112
Wang Y S, Zhu G, Song C Z, et al. 40Ar/39Ar geochronology records of transition from strike-slip to extension in the Tan-Lu fault zone on the eastern terminal of the Dabie Mountains. Chin J Geol (in Chinese), 2006, 41(2): 242–255
Lin W, Faure M, Monie P, et al. Tectonics of SE China: New insights from the Lushan massif (Jiangxi Province). Tectonics, 2000, 19: 852–871
Grimmer J C, Ratschbacher L, McWilliams M, et al. When did the ultrahigh-pressure rocks reach the surface? A 207Pb/206Pb zircon, 40Ar/39Ar white mica, Si-in white mica, single-grain provenance study of Dabie Shan synorogenic foreland sediments. Chem Geol, 2003, 197: 87–110
Zhu G, Wang Y S, Wang D X, et al. Constraints of foreland deformation and sedimentation on synorogenic movement pattern of the Tan-Lu fault zone. Chin J Geol (in Chinese), 2006, 41(1): 102–121
Zhou T X, Chen J F, Li X M, et al. Questions on the Indosinia magmatism in Anhui. Acta Petrol Sin (in Chinese), 1988, 4(3): 46–53
Passchier C W, Trouw R A J. Microtectonics. Berlin: Springer, 2005, 25–110
Stipp M, Stünitz H, Heilbronner R, et al. The eastern Tonale fault zone: a ‘natural laboratory’ for crystal plastic deformation of quartz over a temperature range from 250 to 700°C. J Struct Geol, 2002, 24: 1861–1884
Lafrance B, John Barbara E, Frost B R. Ultra high-temperature and subsolidus shear zones: examples from the Poe Mountain anorthosite, Wyoming. J Struc Geol, 1998, 20: 945–955
Altenberger U. Ductile deformation of K-feldspar in dry eclogite facies shear zones in the Bergen Arcs, Norway. Tectonophysics, 2000, 320: 107–121
Rosenberg C L. Deformation and recrystallisation of plagioclase along a temperature Gradient: an example from the Bergell tonalite. J Struct Geol, 2003, 25: 389–408
Mancktelow N S, Pennacchioni G. The influence of grain boundary fluids on the microstructure of quartz-feldspar mylonites. J Struct Geol, 2004, 26: 47–69
Hongn F D, Hippertt J F. Quartz crystallographic and morphologic fabrics during folding/transposition in mylonites. J Struct Geol, 2001, 23: 81–92
Lebit H, Klaper E M, Lunebirg C M. Fold-controlled quartz textures in the Pennine Mischabel backfold near Zermatt, Switzerland. Tectonophysics, 2002, 359: 1–28
Lister G S, Davies G A. The origin of metamorphic core complexes and detachment faults formed during Tertiary continental extension in the northern Colorado River Region. J Struct Geol, 1989, 12: 65–94
Liu J L, Davis G A, Lin Z Y, et al. The Liaonan metamorphic core complex, Southeastern Liaoning Province, North China: A likely contributor to Cretaceous rotation of Eastern Liaoning, Korea and contiguous areas. Tectonophysics, 2005, 407: 65–80
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Supported by the National Natural Science Foundation of China (Grant Nos. 40272094 and 40672131)
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Zhu, G., Xie, C., Xiang, B. et al. Genesis of the Hongzhen metamorphic core complex and its tectonic implications. Sci. China Ser. D-Earth Sci. 50, 649–659 (2007). https://doi.org/10.1007/s11430-007-0032-x
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DOI: https://doi.org/10.1007/s11430-007-0032-x