Abstract
Samples of mylonite, ultramylonite and phyllonite were collected from 5 localities in the Anhui part of the Tan-Lu fault zone for40Ar/39Ar chronological studies. Among them 4 samples from 3 localities on the eastern margin of the Dabie orogenic belt yielded40Ar/39Ar plateau ages of 128 —132 Ma; and 2 samples from the western margin of the Zhangbalin uplift and eastern margin of the Bengbu uplift gave the same40Ar/39Ar plateau ages of 120 Ma. Isochron analyses and other lines of evidence suggest that the data are reliable. The data are interpreted as cooling ages of sinistral strike-slip deformation of the Tan-Lu fault zone. The younger ages from the north might be related to slower strike-slip rising. These results indicate that the large-scale left-lateral displacement in the Tan-Lu fault zone took place in the Early Cretaceous, rather than in Late Triassic (Indosinian) as proposed by some geologists. Therefore, this fault zone is an intracontinental wrench fault rather than a transform fault or suture line developed during formation of the Dabie orogenic belt.
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References
Xu, J. W., Ma, G. F., Ten years review on studies on the Tan-Lu fault zone, Geological Review (in Chinese), 1992, 38(4): 316–324.
Xu, J. W., The Tancheng-Lujiang Wrench Fault System, Chichester(UK): John Wiley & Sons Ltd, 1993, 177–183.
Zhu, G., Xu, J. W., Tectonic relationships between the Tan-Lu fault zone and the Dabie-Jiaonan orogenic belt, in Research Progress in Structural Geology and Lithosphere Dynamics ((ed., Ma, Z. J.) (in Chinese), Beijing: Seismological Publishing House, 1999, 164–170.
Dou, L. R., Song, J. G., Wang, Y., Chronology of formation of the northern part of the Tan-Lu fault zone and its implications, Geological Review (in Chinese), 1996, 42(6): 508–512.
Yin, A., Nie, S. Y., An indendation model for the North and South China collision and the development of the Tan-Lu and Honam fault system, eastern Asia, Tectonics, 1993, 12(4): 801–813.
Wan, T. F., Zhu, H., The maximum sinistral strike-slip displacement and formation time of the Tan-Lu fault zone, Geological Journal of China Universities (in Chinese), 1996, 2(1): 14–27.
Wang, X. F., Li, Z. J., Chen, B. L. et al., Formation and evolution of the Tan-Lu strike-slip fault system and its geological significance, in Proceedings of 30th International Geological Congress (ed., Zheng, Y. Z.), Beijing: Geological Publishing House,1998, 14: 176–196.
Xu, J. W., Zhu, G., Tectonic models of the Tan-Lu fault zone, eastern China, International Geology Review, 1994, 36: 771- 784.
Zhu, G., Xu, J. W., Displacement, timing and tectonic models of the Tan-Lu fault zone, in Proceedings of 30th International Geological Congress ((ed., Zheng, Y. D.), Beijing: Geological Publishing House, 1998, 14: 167–175.
Zhang, Z. M., Liou, J. G., Coleman, R. G., An outline of the plate tectonics of China, Geol. Soc. Am. Bull., 1984, 95: 295–312.
Watson, M. P., Hayward, A. B., Parkinson, D. N. et al., Plate tectonics history, basin development and petroleum source rock deposition onshore China, Marine and Petroleum Geology, 1987, (4): 205–225.
Okay, A. I., Sengor, A. M. C., Evidence for intracontinental thrust related exhumation of the ultra-high-pressure rocks in China, Geology, 1992, 20: 411–414.
Fossen, H., Dunlap, W. J., Timing and kinematics of Caledonian thrusting and extensional collapse, southern Norway: Evidence from40Ar/39Ar thermochronology, Journal of Structural Geology, 1998, 20(6): 765–781.
Wang, Z. H., Lu, H. F.,40Ar/39Ar thermochronological studies on the Changle-Nanao ductile shear zone, Science in China, Ser. D., 1997, 40(6): 641–647.
Lee, J., Incremental40Ar/39Ar thermochronology of mylonitic rocks from the northern Snake Range, Nevada, Tectonics, 1991, 10(1): 77–100.
Maluski, H., Rajlich, P., Matte, P.,40Ar-39Ar dating of the inner Carpathians Variscan basement and Alpine mylonitic overprinting, Tectonophysics, 1993, 223: 313–337.
Van Camp, S. G., Fullagar, P. D., Rb-Sr whole-rock ages of mylonites from the Blue Ridge and Brevard zone of North Carolina, Geol. Soc. Amer. Abs. With. Prog., 1982, 14: 92–93.
Leak, B. E., Tanner, P. W., Singh, D. et al., Major southward thrusting of the Dalradian rocks of Connemara, western Ireland, Nature, 1983, 305: 210–213.
Adams, M. G., Su, Q., The nature and timing of deformation in the Beech Mountain Thrust Sheet between the Grandfather Mountain and Mountain City Windows in the Blue Ridge of northwestern north Carolina, The Journal of Geology, 1996, 104: 197–213.
Dallmeyer, R. D., Takasu, A.,40Ar/39Ar ages of detrital muscovite and whole-rock slate/phyllite, Naragansett Basin: Implications for rejuvenation during very low-grade metamorphism, Contributions to Mineralogy and Petrology, 1992, 110: 515–527.
Little, T. A., McWilliams, M. O., Holcombe, R. J.,40Ar/39Ar thermochronology of epidote blueschists from the North D’Aguilar block, Queensland, Australia: Timing and kinematics of subduction complex unroofing, Geol. Soc. Am. Bull., 1995, 107(5): 520–535.
Arita, K., Dallmeyer, R. D., Takasu, A., Tectonothermal evolution of the Lesser Himalaya, Nepal: Constraints from40Ar/39Ar ages from the Kathmandu Nappe, The Island Arc, 1997, 6: 372–385.
Dallmeyer, R. D., Pana, D. I., Neubauer, F. et al., Tectonothermal evolution of the Apuseni Mountains, Romania: Resolution of Variscan versus Apline events with40Ar/39Ar ages, The Journal of Geology, 1999, 107: 329–352.
Hu, S. L., Zou, H. B., Zhou, X. M.,40Ar/39Ar muscovite and hornblende ages respectively from cordierite granite at Shexian, Anhui and albite granite at Dexing, Jiangxi, in Lithospheric Textures and Geological Evolution of the Southeast China ((ed., Li, J. L.) (in Chinese), Beijing: Metallurgical Industry Publishing House, 1993, 141–144.
Li nX. M., Li nB. X., Zhang nJ. et al., Isotopic ages of the Guangdian intrusion in Anhui and dynamometamorphism in the Tan-Lu fault zone, Journal of University of Science and Technology (in Chinese), 1985 (supplement): 254–261.
Li, S. G., Hart, S. K., Zheng, S. G. et al., Sm-Nd isotopic age constraint on collision time of North and South blocks, Science in China, Ser. B, 1989, (3): 1391–1400.
Li, S. G., Liu, D. L., Cheng, Y. Z. et al., Formation ages of blueschists in central China, Scientia Geologica Sinica, 1993, 28(1): 21–27.
Li, S. G., Li, H. M., Cheng, Y. Z., Chronology of ultra-high- pressure metamorphism of the Dabieshan-Sulu terrane—Zircon U-Pb isotopic system, Science in China, Ser. D (in Chinese), 1997, 27(3): 200–206.
Wang, G. Z., Yang, W. R., Time and space pattern of Meso-Cenozoic exhumation of Dabie orogenic belt, tectonochronological evidence, Scientia Geologica Sinica (in Chinese), 1998, 23(5): 461–467.
Li, Q., Cheng, W. J., Ma, B. L. et al., Preliminary studies on thermal evolution post collsion of the North China and Yangtze plates, Seismological Geology (in Chinese), 1995, 17(3): 193–203.
Engebretson, D. C., Cox, A., Gordon, R. G., Relative motions between oceanic and continental plates in the Pacific basin, The Geological Society of America, Special Paper 206, 1985, 1–59.
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Zhu, G., Song, C., Wang, D. et al. Studies on40Ar/39Ar thermochronology of strike-slip time of the Tan-Lu fault zone and their tectonic implications. Sci. China Ser. D-Earth Sci. 44, 1002–1009 (2001). https://doi.org/10.1007/BF02875393
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DOI: https://doi.org/10.1007/BF02875393