Blueschist from the Toudaoqiao area, Inner Mongolia, NE China: Evidence for the suture between the Ergun and the Xing’an blocks

Abstract

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).

Keywords

Toudaoqiao blueschists / zoned amphibole / P-T path / Xinlin-Xiguitu suture

References

[1] Badarch G., Cunningham W. D., Windley B. F., . A New Terrane Subdivision for Mongolia: Implication for the Phanerozoic Crustal Growth of Central. Asia. Journal of Asian Earth Science, 2002, 21(1): 87-110.

[2] Buchan C., Pfäjder J., Kröner A., . Timing of Accretion and Collisional Deformation in the Central Asian Orogenic Belt: Implicaitions of Granite Geochronology in the Bayankhongor Ophiolite Zone. Chemical Geology, 2002, 192(1–2): 23-45.

[3] Chen L., Sun J. G., Chen X. S., . 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, 2009, 83: 1327-1334.

[4] Ernst W. G. Tectonic History of Subduction Zones Inferred from Retrograde Blueschist P-T Paths. Geology, 1988, 16(12): 1081-1084.

[5] Evans B. W. Phase Relations of Epidote-Blueschists. Lithos, 1990, 25(1–3): 3-23.

[6] Gao F. H., Xu W. L., Yang D. B., . LA-ICP-MS Zircon U-Pb Dating from Granitoids in Southern Basement of Songliao Basin: Constraints on Ages of the Basin Basement. Science in China D: Earth Science, 2007, 50: 995-1004.

[7] Ge W. C., Wu F. Y., Zhou C. Y., . Emplacement Age of the Tahe Granite and Its Constraints on the Tectonic Nature of the Erguna Block in the Northern Part of the Da Hinggan Range. Chinese Science Bulletin, 2005, 50(7): 2097-2105.

[8] Ge W. C., Sui Z. M., Wu F. Y., . Hf Isotopic Characteristics and Their Implications of the Early Paleozoic Granites in the Northern Da Hinggan Mts., Northeastern China. Acta Petrologica Sinica, 2007, 23(2): 423-440.

[9] Ge W. C., Wu F. Y., Zhou C. Y., . Porphyry Cu-Mo Deposits in the Eastern Xing’an-Mongolian Orogenic Belt: Mineralization Ages and Their Geodynamic Implications. Chinese Science Bulletin, 2007, 52(24): 3416-3427.

[10] Heilongjiang Bureau of GeologyMineral Resources HBGMR Explanation of the Geological Map of the Taerqi Sheet with a 1: 200 000 Scale, 1981, 204-207.

[11] Heilongjiang Bureau of GeologyMineral Resources HBGMR Regional Geology of Heilongjiang Province, 1993, Beijing: Geological Publishing House, 527.

[12] Holland T. J. B. Experimental Determination of the Activities in Disordered and Short-Range Ordered Jadeitic Pyroxene. Contributions to Mineralogy and Petrology, 1983, 82(2): 214-220.

[13] Kretz R. Symbols for Rock-Forming Minerals. American Mineralogist, 1983, 68(1): 277-279.

[14] Leake B. E., Woolley A. R., Arps C. E. S., . Nomenclature of Amphiboles: Report of the Subcommittee on Amphiboles of the International Mineralogical Association, Commission on New Minerals and Mineral Names. Mineralogical Magazine, 1997, 61(405): 295-321.

[15] Li R. S. Xinlin Ophiolite. Heilongjiang Geology, 1991, 2(1): 19-32.

[16] Maruyama S., Liou J., Terabayashi M. Blueschists and Eclogites of the World and Their Exhumation. International Geology Review, 1996, 38(6): 485-594.

[17] Miao L. C., Fan W. M., Zhang F. Q., . Zircon^SHRIMP Geochronology of the Xinkailing-Kele Complex in the Northwestern Lesser Xing’an Range, and Its Geological Implications. Chinese Science Bulletin, 2003, 49(2): 201-209.

[18] Miao L. C., Liu D. Y., Zhang F. Q. Zircon^SHRIMP U-Pb Ages of the “Xinghuadukou Group” in Hanjiayuanzi and Xinlin Areas and the “Zhalantun Group” in Inner Mongolia, Da Hinggan Mountains. Chinese Science Bulletin, 2007, 52(8): 1112-1124.

[19] Miao L. C., Zhang F. C., Jiao S. J. Age, Protoliths and Tectonic Implications of the Toudaoqiao Blueschists, Inner Mongolia, China. Journal of Asian Earth Sciences, 2015, 105: 360-373.

[20] Miyashiro A. Evolution of Metamorphic Belts. Journal of petrology, 1961, 2(3): 277-311.

[21] Mo Y. C. The Petrological Description of the Toudaoqiao Blueschists. Heilongjiang Geology, 1980, 2.

[22] Muller J. F., Rogers J. J. W., Jin Y. G., . Late Carboniferous to Permian Sedimentation in Inner Mongolia, China, and Tectonic Relationships between North China and Siberia. Journal of Geology, 1991, 99(3): 251-263.

[23] Otsuki M., Banno S. Prograde and Retrograde Metamorphism of Hematite-Bearing Basic Schists in the Sanbagawa Belt in Central Shikoku. Journal of Metamorphic Geology, 1990, 8(4): 425-439.

[24] Peng Y. J., Ji C. H., Xin Y. L. Petrology and Geochronology of the Paleo-Jilin-Heilongjiang Orogenic Belt in the Adjacent Areas of China, Russion and Korea. Geology and Resources, 2002, 11(2): 65-75.

[25] Sal'nikova E. B., Sergeev S. A., Kotov A. B., . U-Pb Zircon Dating of Granulite Metamorphism in the Sludyanskiy Complex, Eastern Siberia. Gondwana Research, 1998, 1(2): 195-205.

[26] Sal'nikova E. B., Kozakov I. K., Kotov A. B., . Age of Palaeozoic Granites and Metamorphism in the Tuvino-Mongolian Massif of the Central Asian Mobile Belt: Loss of a Precambrian Microcontinent. Precambrian Research, 2001, 110(1): 143-164.

[27] Sengör A. M. C., Natal’in B. A., Burtman V. S. Evolution of the Altaid Tectonic Collage and Palaeozoic Crustal Growth in Eurasia. Nature, 1993, 364(6435): 299-307.

[28] Takasu A. Daly J. S., Cliff R. A., Yardley B. W. D. P-T Histories of Peridotite and Amphibolite Tectonic Blocks in the Sanbagawa Metamorphic Belt, Japan. Evolution of Metamorphic Belts, 1989, 43, 533-538.

[29] Wang Y., Zhang F. Q., Zhang D. W., . Zircon^SHRIMP U-Pb Dating of Meta-Diorite from the Basement of the Songliao Basin and Its Geological Significance. Chinese Science Bulletin, 2006, 51(15): 1877-1883.

[30] Wei C. J. Progress in the Study of Blueschists and Related High Pressure Metamorphic Belts. Earth Science Frontiers, 1994, 1(1–2): 140-144.

[31] Wei C. J., Su X. L., Li Y. J. A New Interpretation of the Conventional Thermobarometry in Eclogite: Evidence from the Calc Ulated PT Pseudosections. Acta Petrological Sinica, 2009, 25(09): 2078-2088.

[32] Wilde S. A., Dorsett B. H., Liu J. L. 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, 1997, 17: 59-74.

[33] Wilde S. A., Wu F. Y., Zhang X. Z. Late Pan-African Magmatism in Northeastern China: SHRIMP U-Pb Zircon Evidence for Igneous Ages from the Mashan Complex. Precambrian Research, 2003, 122(1–4): 311-327.

[34] Wu F. Y., Sun D. Y., Li H. M., . The Nature of Basement beneath the Songliao Basin in NE China: Geochemical and Isotopic Constraints. Physics and Chemistry of the Earth (Part A), 2001, 26(9): 793-803.

[35] Wu F. Y., Sun D. Y., Ge W. C., . Geochronology of the Phanerozoic Granitoids in Northeastern China. Journal of Asian Earth Sciences, 2011, 41(1): 1-30.

[36] Wu F. Y., Zhao G.C., Sun D.Y., . The Hulan Group: Its Role in the Evolution of the Central Asian Orogenic Belt of NE China. Journal of Asian Earth Sciences, 2007, 30(3–4): 542-556.

[37] Xiao W. J., Windley B., Hao J., . Accretion Leading to Collision and the Permian Solonker Suture, Inner Mongolia, China: Termination of the Central Asian Orogenic Belt. Tectonics, 2003, 22(6): 1-20.

[38] Xiao W. J., Windley B. F., Huang B. C., . End Permian to Mid-Triassic Termination of the Southern Central Asian Orogenic Belt. International Journal of Earth Sciences, 2009, 98: 1189-1217.

[39] Ye H. W., Zhang X. Z., Zhou Y. W. The Texture and Evolution of Manzhouli-Suifenhe Lithosphere-Study Based on Features of Blueschist and Ophiolites. Geological Studies of Lithospheric Structure and Evolution of Manzhouli-Suifenhe Geotransect, China, 1994, Beijing: Seismic Press, 73-83.

[40] Zhang J. H., Ge W. C., Wu F. Y., . Large-Scale Early Cretaceous Volcanic Events in the Northern Great Xing’an Range, Northeastern China. Lithos, 2008, 102(1–2): 138-157.

[41] Zhang M. S., Peng X.D., Sun X. M. The Paleozoic Tectonic Geographical Pattern of Northeast China. Liaoning Geology, 1998, 2: 91-96.

[42] Zhao S., Xu W. L., Tang J., . Neoproterozoic Magmatic Events and Tectonic Attribution of the Erguna Massif: Constraints from Geochronological, Geochemical and Hf Isotopic Data of Intrusive Rocks. Earth Science, 2016, 41(11): 1803-1829.

[43] Zhou J. B., Wilde S. A., Zhang X. Z. Early Paleozoic Metamorphic Rocks of the Erguna Block in the Great Xing’an Range, NE China: Evidence for the Timing of Magmatic and Metamorphic Events and Their Tectonic Implications. Tectonophysics, 2011, 499(1–4): 105-117.

[44] Zhou J. B., Wang B., Wilde S. A., . Geochemistry and U-Pb Zircon Dating of the Toudaoqiao Blueschists in the Great Xing’an Range, Northeast China, and Tectonic Implications. Journal of Asian Earth Sciences, 2015, 97: 197-210.

[45] Zorin Y. A. Geodynamics of the Western Part of the Mongolia-Okhotsk Collisional Belt, Trans-Baikal Region (Russia) and Mongolia. Tectonophysics, 1999, 306(1): 33-45.