Abstract
The sub-vertical meso- and micro-structures and fabrics developed in coesite-bearing foliated eclogites in the Taohang (桃行) area, southeastern Shandong (山东), China. The diagnostic structures and fabrics, including penetrative foliation or mylonitic foliation containing mineral and stretching lineations, as well as sheath-like folds, appear to be the development of anastomosing UHP eclogite-facies shear belt arrays hosting massive eclogites. Textural relationships and mineral assemblages indicate that the deformation of foliated eclogites developed closely after the formation of the massive eclogite, prior to the development of the granulite/amphibolite-facies symplectites and coronas, occurring over a very wide pressure range of (31−8)×102 MPa. It presents the structural records of the tectonometamorphic processes as being responsible for the earliest stages of exhumation of the UHP metamorphic rocks. Extensive regional field observations show that the meso- and micro-structures and fabrics recognized in the foliated eclogites at Taohang are remarkably similar or consistent in the whole Dabie (大别)-Sulu (苏鲁) UHP metamorphic belt. This article, thus, supports the idea that earliest stages of exhumation of the UHP metamorphic rocks, from mantle depths to the Moho or the mantle-crust boundary layering, may be attributed mainly to a sub-vertical extrusion and ductile flow along the subduction channel, belonging to a syn-collision exhumation at about 235 to 220 Ma.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References Cited
Abalos, B., 1997. Omphacite Fabric Variation in the Cabo Ortegal Eclogite (NW Spain): Relationships with Strain Symmetry during High-Pressure Deformation. Journal of Structural Geology, 19(5): 621–637
Ames, L., Tilton, G. R., Zhou, G. Z., 1993. Timing of Collision of the Sino-Korean and Yangtse Cratons: U-Pb Zircon Dating of Coesite-Bearing Eclogites. Geology, 21: 339–342
Banno, S., Enami, M., Hirajima, T., et al., 2000. Decompression P-T Path of Coesite Eclogite to Granulite from Weihai, Eastern China. Lithos, 52(1–4): 97–108
Bell, T. H., 1985. Deformation Partitioning and Porphyroblast Rotation in Metamorphic Rocks: A Radical Reinterpretation. Journal of Metamorphic Geology, 3(2): 109–118
Berthe, D., Choukroune, P., Jegouzo, P., 1979. Orthogneiss, Mylonite and Non-coaxial Deformation of Granites: The Example of the South Armorican Shear Zone. Journal of Structural Geology, 1(1): 31–42
Burg, J. P., 1999. Ductile Structures and Instabilities: Their Implication for Variscan Tectonics in the Ardennes. Tectonophysics, 309(1–4): 1–25
Carswell, D. A., 1986. The Metamorphic Evolution of Mg-Cr Type Norwegian Garnet Peridotites. Lithos, 19(3–4): 279–297
Cobbold, P. R., Quinquis, H., 1980. Development of Sheath Folds in Shear Regimes. Journal of Structural Geology, 2(1/2): 119–126
Cong, B. L., Zhai, M. G., Carswell, D. A., et al., 1995. Petrogenesis of Ultrahigh-Pressure Rocks and Their Country Rocks at Shuanghe in Dabieshan, Central China. European Jorunal of Mineralogy, 7: 119–138
de Sigoyer, J., Guillot, S., Dick, P., 2004. Exhumation of the Ultrahigh-Pressure Tso Morari Unit in Eastern Ladakh (NW Himalaya): A Case Study. Tectonics, 23(3): TC 3003, doi: 10 1029/2002TC001492
Ernst, W. G., Maruyama, S., Wallis, S. R., 1997. Buoyancy-Driven, Rapid Exhumation of Ultrahigh-Pressure Metamorphosed Continental Crust. Proceedings of the National Academy of Science, 94(18): 9532–9537
Godin, L., Grujic, D., Law, R. D., et al., 2006. Channel Flow, Ductile Extrusion and Exhumation in Continental Collision Zones: An Introduction. In: Law, R. D., Searle, M. P., Godin, L., eds., Channel Flow, Ductile Extrusion and Exhumation in Continental Collision Zones. Special Publication of Geological Society, London, 268: 1–23
Gong, B., Zheng, Y. F., Wu, Y. B., et al., 2007. Geochronology and Stable Isotope Geochemistry of UHP Metamorphic Rocks at Taohang in the Sulu Orogen, East-Central China. International Geology Review, 49(3): 259–286
Gu, D. L., Zhang, C. H., Chen, J. Q., 1996. The Geological and Tectonic Evolution of the Northern Part of the Jiaonan Uplift, Southeastern Shandong Province. China University of Geosciences Press, Wuhan. 122 (in Chinese)
Hacker, B. R., Ratschbacher, L., Webb, L. E., et al., 2000. Exhumation of Ultrahigh-Pressure Continental Crust in East Central China: Late Triassic-Early Jurassic Tectonic Unroofing. Journal of Geophysical Research, 105(B6): 13339–13364
Handy, M. R., 1990. The Solid-State Flow of Polymineralic Rocks. Journal of Geophysical Research, 95(B6): 8647–8661
Liou, J. G., Zhang, R. Y., Jahn, B. M., 1997. Petrology, Geochemistry and Isotope Data on an Ultrahigh-Pressure Jadeite Quartzite from Shuanghe, Dabie Mountains, East-Central China. Lithos, 41(1–3): 59–78
Liu, D. Y., Jian, P., 2004. 243 Ma UHP and 228 Ma Retrograde Events of the Shuanhe Jideite Quartzite, Eastern Dabie Mountains—SHRIMP Dating, Mineral Inclusions and Zircon REE Patterns. Acta Geologica Sinica, 78(2): 211–217 (in Chinese with Enghish Abstract)
Okay, A. I., Sengor, A. M. C., Satir, M., 1993. Tectonics of an Ultrahigh-Pressure Metamorphic Terrane: The Dabie Shan/Tongbai Shan Orogen, China. Tectonics, 12(6): 1320–1334
Platt, J. P., 1993. Exhumation of High-Pressure Rocks: A Review of Concepts and Processes. Terra Nova, 5(2): 119–113
Ratschbacher, L., Hacker, B. R., Calvert, A., et al., 2003. Tectonics of the Qinling (Central China): Tectonostratigraphy, Geochronology and Deformation History. Tectonophysics, 366(1–2): 1–53
Schulmann, K., Lexa, O., Stipsk, P., et al., 2008. Vertical Extrusion and Horizontal Channel Flow of Orogenic Lower Crust: Key Exhumation Mechanisms in Large Hot Orogens? Journal of Metamorphic Geology, 26(2): 273–297
Stöckhert, B., 2002. Stress and Deformation in Subduction Zones: Insight from the Record of Exhumed Metamorphic Rocks. In: de Meer, S., Drury, M. R., de Bresser, J. H. P., et al., eds., Deformation Mechanism, Rheology and Tectonics: Current Status and Future Perspectives. Geological Society of London Special Publication, 200: 255–274
Su, S. G., Wang, R. M., Gu, D. L., et al., 1994. High-Pressure Metamorphism of Eclogitic Country Rocks, Jiaonan Group, Zhucheng District, Shandong Province. Geoscience, 8(1): 65–72 (in Chinese with English Abstract)
Suo, S. T., Zhong, Z. Q., You, Z. D., 2000. Extensional Deformation of Post Ultrahigh-Pressure Metamorphism and Exhumation Process of Ultrahigh-Pressure Metamorphic Rocks in the Dabie Massif, China. Science in China (Series D), 43(3): 225–236
Suo, S. T., Zhong, Z. Q., Zhou, H. W., et al., 2002. Triassic Collisional Structures and Post-Collisional Deformation of Bixiling UHP Rock Stack: Insights for Tectonic Evolution of UHP Metamorphic Belt in Dabie Massif, Central China. Journal of China University of Geosciences, 13(1): 1–13
Suo, S. T., Zhong, Z. Q., Zhou, H. W., et al., 2005. Tectonic Evolution of the Dabie-Sulu UHP and HP Metamorphic Belts, East-Central China: Structural Record in UHP Rocks. International Geological Review, 47(11): 1207–1221
Suo, S. T., Zhong, Z. Q., Zhou, H. W., et al., 2007. Polyphase Deformation of the Weihai-Rongcheng UHP Unit Rocks, NE Sulu: Insights into the Tectonic Evolution of the Dabie-Sulu UHP and HP Belts, China. Acta Geologica Sinica, 81(1): 42–54
Thompson, A. B., Schulmann, K., Jezek, J., 1997. Extrusion Tectonics and Elevation of Lower Crustal Metamorphic Rocks in Convergent Orogens. Geology, 25(6): 491–494
Xiao, T. L., Li, S. G., Jagoutz, E., et al., 1995. P-T-t Path for Coesite-Bearing Peridotite-Eclogite Association in the Bixiling, Dabie Mountains. Chinese Science Bulletin, 40(Suppl.): 156–158
Xu, S. T., Okay, A. I., Ji, S. Y., et al., 1992. Diamond from the Dabie Shan Metamorphic Rocks and Its Implication for Tectonic Setting. Science, 256(5053): 80–82
Yao, Y. P., Ye, K., Liu, J. B., et al., 2000. A Transitional Eclogite- to High Pressure Granulite-Facies Overprint on Coesite-Eclogite at Taohang in the Sulu Ultrahigh-Pressure Terrane, Eastern China. Lithos, 52(1–4): 109–120
Ye, K., Yao, Y. P., Katayama, I., et al., 2000. Large Areal Extent of Ultrahigh-Pressure Metamorphism in the Sulu Ultrahigh-Pressure Terrane of East China: New Implications from Coesite and Omphacite Inclusions in Zircon of Granitic Gneiss. Lithos, 52(1–4): 157–164
Zhang, C. H., Gu, D. L., Song, H. L., et al., 1993. A Study of the Left-Lateral Normal Slip Ductile Shear Zone in the North Margin of Jiaonan Uplift, Shandong. Geoscience, 7(4): 435–443 (in Chinese with English Abstract)
Zhang, R. Y., Liou, J. G., Ernst, W. G., 1995. Ultrahigh-Pressure Metamorphism and Decompressional P-T Paths of Eclogites and Country Rocks from Weihai, Eastern China. Island Arc, 4(4): 293–309
Zhong, Z. Q., Suo, S. T., Zhang, L., 2007. Plastic Rheology of Rocks: A Structural Study on the Dabie-Sulu UHP and HP Metamorphic Belts. China University of Geosciences Press, Wuhan. 195 (in Chinese with English Abstract)
Author information
Authors and Affiliations
Corresponding author
Additional information
This study was supported by the National Natural Science Foundation of China (Nos. 40372094 and 49972067).
Rights and permissions
About this article
Cite this article
Suo, S., Zhong, Z., Zhou, H. et al. Meso- and micro-structures of foliated eclogites in Dabie-Sulu UHP belt and implications for the earliest stages of exhumation of UHP metamorphic rocks: An example from Taohang, southeastern Shandong, China. J. Earth Sci. 20, 649–658 (2009). https://doi.org/10.1007/s12583-009-0057-5
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12583-009-0057-5