Abstract
The Daqingshan thrust system, to the south of the Shiguai Mesozoic basin, is a complex system of top-to-the-north thrusting tectonic sheets. The thrust system has a complicated evolution due to multi-stage thrusting. In order to date the thrusting events, syntectonic muscovite and biotite grains are respectively analyzed with normal40Ar/39Ar dating and laser40Ar/39Ar dating, which yield 2 isochron ages, i.e. 193.74 ± 3.88 Ma and 121.6 ± 1.6 Ma. These ages suggest that faults within the Daqingshan thrust system formed during 2 stages of thrusting, one the early Indosinian and the other the late Yanshanian. The isotopic dating is consistent with field geological relations. Indosinan deformation is evidenced by top-to-the-north thrusting, with the occurrence of a series of large-scale east-west trending thrust faults and folds, while the Yanshanian thrusting is characterized by top-to-the-NNW thrusting. It is superposed on and modifies early Indosinian thrust faults.
Similar content being viewed by others
References
Wang, Z. Q., Daqingshan coal geology in Shuiyuan, Geological Report (in Chinese), 1928, 10: 1–42.
Sun, J. C., Western region geology of Suiyuan and Chahaer, Geological Memoirs (10) (in Chinese), 1934, 12: 1–66.
Li, X. X., Shiguai coalfield stratum and significance of several unconformities at Daqingshan region in Inner Mongolia, Acta Geologica Sinica (in Chinese with English abstract), 1954, 34(4): 411–436.
Wang, J. P., Yang, Y. D., Genesis mechanism discuss of Daqingshan thrust-nappe, Collection of Structural Geology (in Chinese with English abstract), 1986, 6: 1–16.
Zhu, S. Y., Thrusts of Seertengshan-Daqingshan region in Inner Mongolia, Geology of Inner Mongolia (in Chinese with English abstract), 1997, 84(1): 41–48.
Liu, Z. H., Xu, Z. Y., Yang, Z. S., On Daqingshan thrust-nappe in Inner Mongolia, Regional Geology of China (in Chinese with English abstract), 1999, 18(4): 366–372.
Cheng, Y. Q., Generality of China Regional Geology (in Chinese), Beijing: Geological Publishing House, 1994.
Zheng, Y. D., Davis, G. A., Wang, C., Major thrust system in the Daqingshan area, Inner Mongolia, China, Science in China, Ser. D. (in Chinese), 1998, 28(4): 289–295.
Davis, G. A., Wang, C., Zheng, Y. D., The enigmatic Yinshan fold-and-thrust belt of northern China: New views on its intraplate contractional style, J. Geology, 1988, 26(1): 43–46.
Darby, J., Davis, G. A., Zheng, Y. D., Structural evolution of the southwestern Daqingshan, Yinshan belt, Inner Mongolia, China, Geological Society of America, 2001, 194: 199–214.
Ritts, D., Darby, B. J., Cope, T., Early Jurassic extensional basin formation in the Daqing Shan segment of Yinshan belt, northern North China Block, Inner Mongolia, Tectonophysics, 2001, 339: 239–258.
Yan, G. H., Mou, B. L., Xu, B. L., Triassic alkaline intrusives in the Yanliao-Yinshan area: Their chronology, Sr, Nd, Pb isotopic characteristics and significance, Science in China, Ser. D, 1999, 42(6): 582–586.
Tao, J. X., Tectonic environment of alkaline intrusions in Wulashan fronts, Geology of Inner Mongolia (in Chinese with English abstract), 1994, 8(1): 20–26.
McDougall, I., Harrison, T. M., Geochronology and Thermochronologyby 40Ar/39Ar method: An example from the Norumbega fault zone, Maine, Earth and Planetary Science Letters, 1993, 120: 221–237.
Davis, G. A., Darby, B. J., Zheng, Y. D. et al., Geometric and temporal evolution of an extensional detachment fault, Hohhot metamorphic core complex, Inner Mongolia, China, Geology, 2002, 30(11): 1003–1006.
Author information
Authors and Affiliations
Corresponding author
About this article
Cite this article
Liu, Z., Xu, Z. & Yang, Z. 40Ar/39Ar dating of Daqingshan thrust. Chin. Sci. Bull. 48, 2734–2738 (2003). https://doi.org/10.1007/BF02901766
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02901766