Tectonic Boundary and Ceasing Time of Amalgamation between the North China Craton and the North Qinling Belt
- 21 Downloads
The Qinling orogenic belt is a composite orogen, consisting of the north and south Qinling belts with different collision ages. The North Qinling belt is composed of several petro-tectonic units, including the Kuanping, Erlangping, Qinling and Danfeng groups with numerous granitoid plutons from Neoproterzoic to Middle Devonian. To the north of the Kuanping Group, a mylonitized granite body in the Luanchuan Group was determined to have the magmatic age of 850 Ma, which is the northernmost Neoprotozoic granite body. The volcanic rocks of the Dahongkou Formation from the Luanchuan Group had the eruptive age of ~1 600 Ma, obtained from zircon U-Pb LA-ICP-MS analysis. The detrital zircons in meta-sandstones from the Taowan Group have three populations of ~920–1 400, ~1 600–2 100, and >2 200 Ma ages, whereas those from the Kuanping Group shows six populations with the peaks of ~590, ~767, ~952, ~1 590, ~2 485, and ~3 200 Ma. These data suggest that the boundary between the North China Craton and the North Qinling belt cannot simply be constrained by using the events determined from zircon U-Pb ages. The granitoid plutons with the magmatic age of 430 Ma were strongly deformed, while those with the magmatic age of ~390 Ma show no or less deformation, indicating that the deformation of amalgamation between the North China Craton and the North Qinling belt ceased between 390 and 430 Ma.
Key WordsQinling orogenic belt Taowan Group Kuanping Group granitoid zircon age
Unable to display preview. Download preview PDF.
This study was supported by the National Natural Science Foundation of China (No. 41372080). Professor Zhendong You guided me to finish my thesis studies on the metamorphism of the Qinling-Dabie orogenic belt, as a master student from 1985 to 1988 and as a PHD student from 1991 to 1994. He is a knowledgeable, gentle and kind teacher. This paper is dedicated to Professor Zhendong You for his birthday of 90 years old. The final publication is available at Springer via https://doi.org/10.1007/s12583-018-0847-8.
- Cao, H. H., Li, S. Z., Zhao, S. J., et al., 2016. Detrital Zircon Geochronology of Neoproterozoic to Early Paleozoic Sedimentary Rocks in the North Qinling Orogenic Belt: Implications for the Tectonic Evolution of the Kuanping Ocean. Precambrian Research, 279: 1–16. https://doi.org/10.13039/501100001809 CrossRefGoogle Scholar
- Chen, D. L., Ren, Y. F., Gong, X. G., et al., 2015. Identification and Its Geological Significance of Eclogite in Songshugou, the North Qinling. Acta Petrologica Sinica, 31(7): 1841–1854 (in Chinese with English Abstract)Google Scholar
- Diwu, C. R., Sun, Y., Liu, L. A., et al., 2010. The Disintegration of Kuanping Group in North Qinling Orogenic Belts and Neo-Proterozoic N-MORB. Acta Petrologica Sinica, 26: 2025–2038 (in Chinese with English Abstract)Google Scholar
- Diwu, C. R., Sun, Y., Zhang, H., et al., 2012. Episodic Tectonothermal Events of the Western North China Craton and North Qinling Orogenic Belt in Central China: Constraints from Detrital Zircon U-Pb Ages. Journal of Asian Earth Sciences, 47: 107–122. https://doi.org/10.1016/j.jseaes.2011.07.012 CrossRefGoogle Scholar
- Dong, Y. P., Yang, Z., Liu, X. M., et al., 2014. Neoproterozoic Amalgamation of the Northern Qinling Terrain to the North China Craton: Constraints from Geochronology and Geochemistry of the Kuanping Ophiolite. Precambrian Research, 255: 77–95. https://doi.org/10.13039/501100001809 CrossRefGoogle Scholar
- Gong, X. K., Chen, D. L., Ren, Y. F., et al., 2016. Identification of Coesite-Bearing Amphibolite in the North Qinling and Its Geological Significance. Chinese Science Bulletin, 61(12): 1365–1378 (in Chinese)Google Scholar
- Henan Institute of Geological Survey, 2001. 1: 250 000 Geological Map of Pingdingshan. Henan Institute of Geological Survey, Zhengzhou (in Chinese)Google Scholar
- Lu, S. N., Li, H. K., Chen, Z. H., et al., 2003. Meso-Neoproterozoic Geological Evolution of the Qinling and Its Respondence to Rodinia Event. Geological Publishing House, Beijing. 1–194 (in Chinese)Google Scholar
- Yang, J. S., Xu, Z. Q., Dobrzhinetskaya, L. F., et al., 2003. Discovery of Metamorphic Diamonds in Central China: An Indication of a >4 000-km-Long Zone of Deep Subduction Resulting from Multiple Continental Collisions. Terra Nova, 15(6): 370–379. https://doi.org/10.1046/j.1365-3121.2003.00511.x CrossRefGoogle Scholar
- Yuan, H. L., Gao, S., Dai, M. N., et al., 2008. Simultaneous Determinations of U-Pb Age, Hf Isotopes and Trace Element Compositions of Zircon by Excimer Laser-Ablation Quadrupole and Multiple-Collector ICP-MS. Chemical Geology, 247(1/2): 100–118. https://doi.org/10.1016/j.chemgeo.2007.10.003 CrossRefGoogle Scholar
- Zhang, G. W., Meng, Q. G., Yu, Z. P., et al., 1996. Orogenesis and Dynamics of the Qinling Orogen. Science in China Series D: Earth Sciences, 39: 225–234Google Scholar