Blueschist from the Toudaoqiao area, Inner Mongolia, NE China: Evidence for the suture between the Ergun and the Xing’an blocks
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Blueschist accompanied by pelitic schist expose along the Xinlin-Xiguitu fault in the Toudaoqiao area, northeastern China. In this paper, the blueschist is systematically studied on the petrography and mineral chemistry. The amphiboles in the blueschist are zoned from winchite core to magnesioriebeckite/glaucophane rim to winchite outermost rim. The peak metamorphic conditions are defined by the mineral assemblage of magnesioriebeckite/glaucophane, epidote, high-Si phengite (Si<7.1), chlorite, albite, hematite and quartz, indicating an epidote-blueschist facies metamorphism. The P-T conditions are estimated as T=350-400 °C and P=10-12 kbar. The occurrence of the blueschist along the Xinlin-Xiguitu fault strongly suggests the fault is the suture between the Ergun and the Xing'an blocks situated in the eastern portions of the Central Asia orogenic Belt (CAOB).
Key WordsToudaoqiao blueschists zoned amphibole P-T path Xinlin-Xiguitu suture
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We thank the members of the Metamorphic Seminar and the Geoscience Seminar, Shimane University for helpful discussion and suggestions. We also thank Profs. W., Jin, C. Q., Zheng, Dr. Q. B., Wen, L., Zhang and Y. L., Shao, of the College of Earth Sciences, Jilin University, for their suggestion and help in the field. This study was supported by 973 program (No. 2013CB429802) to Y.J. Liu, the National Natural Science Foundation of China (Grant 41302175) to W. M. Li, Jilin University and JSPS Grant-in-Aid for Scientific Research (Nos. 17340149, 24340124) to A. Takasu, Shimane University, Japan. The final publication is available at Springer via http://dx.doi.org/10.1007/s12583-017-0721-0.
- Chen, L., Sun, J. G., Chen, X. S., et al., 2009. Zircon LA-ICP-MS U-Pb Dating of Granite from the Yinchengzi Gold Deposit Area in the Eastern Zhang Guang Cailing Area and Its Geological Significance. Acta Geologica Sinica, 83: 1327–1334Google Scholar
- Ge, W. C., Sui, Z. M., Wu, F. Y., et al., 2007a. Hf Isotopic Characteristics and Their Implications of the Early Paleozoic Granites in the Northern Da Hinggan Mts., Northeastern China. Acta Petrologica Sinica, 23(2): 423–440 (in Chinese with English Abstract)Google Scholar
- Heilongjiang Bureau of Geology and Mineral Resources (HBGMR), 1981. Explanation of the Geological Map of the Taerqi Sheet with a 1: 200 000 Scale. 204–207 (in Chinese)Google Scholar
- Heilongjiang Bureau of Geology and Mineral Resources (HBGMR), 1993. Regional Geology of Heilongjiang Province, Geological Publishing House, Beijing. 527 (in Chinese with English Abstract)Google Scholar
- Kretz, R., 1983. Symbols for Rock-Forming Minerals. American Mineralogist, 68(1): 277–279Google Scholar
- Li, R. S., 1991. Xinlin Ophiolite. Heilongjiang Geology, 2(1): 19–32 (in Chinese with English Abstract)Google Scholar
- Mo, Y. C., 1980. The Petrological Description of the Toudaoqiao Blueschists. Heilongjiang Geology, 2 (in Chinese)Google Scholar
- Peng, Y. J., Ji, C. H., Xin, Y. L., 2002. Petrology and Geochronology of the Paleo-Jilin-Heilongjiang Orogenic Belt in the Adjacent Areas of China, Russion and Korea. Geology and Resources, 11(2): 65–75Google Scholar
- Takasu, A., 1989. P-T Histories of Peridotite and Amphibolite Tectonic Blocks in the Sanbagawa Metamorphic Belt, Japan. In: Daly, J. S., Cliff, R. A. Yardley, B. W. D. eds., Evolution of Metamorphic Belts. Geological Society Special Publication. 43(1): 533–538Google Scholar
- Wei, C. J., 1994. Progress in the Study of Blueschists and Related High Pressure Metamorphic Belts. Earth Science Frontiers, 1(1–2): 140–144 (in Chinese with English Abstract)Google Scholar
- Wei, C. J., Su, X. L., Li, Y. J., 2009. A New Interpretation of the Conventional Thermobarometry in Eclogite: Evidence from the Calc Ulated PT Pseudosections. Acta Petrological Sinica, 25(09): 2078–2088Google Scholar
- Wilde, S. A., Dorsett, B. H., Liu, J. L., 1997. The Identification of A Late Pan-African Granulite Facies Event in Northeastern China: SHRIMP U-Pb Zircon Dating of the Mashan Group at Liu Mao, Heilongjiang Province, China. Proceedings of the 30th IGC: Precambrian Geology and Metamorphic Petrology, VSP International. Science Publishers, Amsterdam. 17, 59–74Google Scholar
- Ye, H. W., Zhang, X. Z., Zhou, Y. W., 1994. The Texture and Evolution of Manzhouli-Suifenhe Lithosphere-Study Based on Features of Blueschist and Ophiolites. In Geological Studies of Lithospheric Structure and Evolution of Manzhouli-Suifenhe Geotransect, China (M-SGT Geology Group eds.). Seismic Press, Beijing. 73–83 (in Chinese with English Abstract)Google Scholar
- Zhang, M. S., Peng, X.D., Sun, X. M., 1998. The Paleozoic Tectonic Geographical Pattern of Northeast China. Liaoning Geology, 2: 91–96 (in Chinese with English Abstract)Google Scholar
- Zhao, S., Xu, W. L., Tang, J., et al., 2016. Neoproterozoic Magmatic Events and Tectonic Attribution of the Erguna Massif: Constraints from Geochronological, Geochemical and Hf Isotopic Data of Intrusive Rocks. Earth Science, 41(11): 1803–1829Google Scholar