Advertisement

Science in China Series D: Earth Sciences

, Volume 43, Supplement 1, pp 69–81 | Cite as

Identification of the island-arc magmatic zone in the Lianghe-Raofeng-Wuliba area, south Qinling and its tectonic significance

  • Lai Shaocong 
  • Zhang Guowei 
  • Yang Ruiying 
Article

Abstract

Detailed studies indicate that a typical island-arc magmatic zone exists in the Lianghe-Raofeng-Wuliba area of south Qinling. This is characterized by continental marginal andesite and bimodal volcanic rock association which was formed in a rift environment within an oceanic island-arc. The island-arc magmatic zone is the product of Devonian-Carboniferous oceanic crust subduction and rifting of Mianlue ancient oceanic basin. The presence of the island-arc magmatic zone suggests that the Mianxian-Lueyang suture zone had extended to the Bashan arcuate area. The Sunjiahe volcanic rock association of the Xixiang Group formed in a volcanic-arc setting which should have a close relationship with Mianlue suture zone.

Keywords

island-arc volcanic rock association geochemistry tectonic setting south Qinling 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Zhang, G. W., Meng, Q. R., Lai, S. C., Structure and tectonic of the Qinling orogenic belt, Science in China, Series B (in Chinese), 1995, 25: 994.Google Scholar
  2. 2.
    Lai, S. C., Zhang, G. W., Geochemical features of ophiolite in Mianxian-Lueyang suture zone, Qinling orogenic belt, Journal of China University of Geosciences, 1996, 7(2): 165.Google Scholar
  3. 3.
    Lai, S. C., Zhang, G. W., Yang, Y. C. et al., Petrology and geochemistry features of the metamorphic volcanic rocks in Mianxian-Lueyang suture zone, south Qinling, Acta Petrologica Sinica (in Chinese), 1997, 13(4): 563.Google Scholar
  4. 4.
    Lai, S. C., Zhang, G. W., Yang, Y. C. et al., Geochemistry of the ophiolite and island-arc volcanic rocks in the Mianxian-Lueyang suture zone, southern Qinling and their tectonic significance, Geochimica (in Chinese), 1998, 27(3): 283.Google Scholar
  5. 5.
    Xu, J. F., Han, Y. W., High radiogenic Pb-isotope composition of ancient MORB-typerocks from Qinling area— Evidence for the presence of Tethyan-type oceanic mantle, Science in China, Series D, 1996, 39(Supp.): 33.Google Scholar
  6. 6.
    Dong, Y. P., Zhang, G. W., Lai, S. C. et al., An ophiolitic tectonic mélange first discovered in Huashan area, south margin of Qinling orogenic belt, and its tectonic implications, Science in China, Series D, 1999, 42(3): 292.CrossRefGoogle Scholar
  7. 7.
    Wang, G. B., Wu, W. R., Zhang, S. Q., The characteristic of the geological body between Lueyang and Shiquan in Shaanxi, China, Geology of Shaanxi (in Chinese), 1997, 15(1): 1.Google Scholar
  8. 8.
    Huang, Y., Presinian crystalline rock in Xinji-Moujiaba area, south Shaanxi Province, Geological Review (in Chinese), 1948, 13(1–2): 131.Google Scholar
  9. 9.
    Editorial Group of Shaanxi Regional Strata, Regional Strata Table of Northwest Area of China—Fascicle of Shaanxi Province (in Chinese). Beijing: Geological Publishing House, 1983, 1.Google Scholar
  10. 10.
    Bureau of Geology and Mineral Resources of Shaanxi Province, Regional Geology of Shaanxi Province (in Chinese), Beijing: Geological Publishing House, 1989, 1.Google Scholar
  11. 11.
    Tao, H. X., Cheng, X. R., Feng, H. R. et al., Strata classification and comparison for the “Xixiang Group”, south Hanzhong, Journal of Xi'an College of Geology (in Chinese), 1982, 4(1): 32.Google Scholar
  12. 12.
    Tao, H. X., He, H. Y., Wang, Q. Q. et al., Tectonic Evolutionary History of Northern Margin of Yangtze Plate (in Chinese), Xi'an: Northwest University Press, 1993 1.Google Scholar
  13. 13.
    Shang, R. J., Xie, M. X., Metamorphism for the Middle-Upper Proterozoic Group of the Northern Margin of Yangtze Plate (in Chinese), Xi'an: Northwest University Press, 1992, 1.Google Scholar
  14. 14.
    Zhang, E. P., Niu, D. Y., Huo, Y. G. et al., Review of the geology and tectonic features of the Qinling and its adjacent area (in Chinese), Beijing: Geological Publishing House, 1993, 1.Google Scholar
  15. 15.
    Wang, Z. Q., Cheng, H. H., Li, J. L. et al., Discovery and its geological significance of the radiolariate fossil in the Xixiang group, south Qinling, Science in China, Series D (in Chinese), 1999, 29(1): 38.Google Scholar
  16. 16.
    Winchester, J. A., Floyd, P. A., Geochemical discrimination of different magmas series and their differentiation products using immobile elements, Chem. Geol., 1977, 20: 325.CrossRefGoogle Scholar
  17. 17.
    Pearce, J. A., A “users guide” to basalt discrimination diagrams, Overseas Geology (in Chinese), 1984, (4): 1.Google Scholar
  18. 18.
    Marlina, A. E., John, F., Geochemical response to varying tectonic settings: An example from southern Sulawesi (Indonesia), Geochimica et Cosmochimica Acta, 1999, 63(7/8): 1155.Google Scholar
  19. 19.
    Pearce, J. A., The role of sub continental lithosphere in magma genesis at destructive plate margins, Continental Basalts and Mantle Xenoliths (eds. Hawkesworth et al.), Nantwich Shiva, 1983, 230.Google Scholar
  20. 20.
    Coish, R. A., Hickey, R., Frey, F. A., Rare earth element geochemistry of the Betts Cove ophiolite, Newfoundland: complexities in ophiolite formation, Geochim. Cosmochim. Acta, 1982, 46: 2117.CrossRefGoogle Scholar
  21. 21.
    Beccaluva, L., Ohnenstetter, D., Ohnenstetter, M., Two magmatic series with island arc affinites within the Vourinos ophiolite, Contr. Mineral. Petrol., 1984, 85: 253.CrossRefGoogle Scholar
  22. 22.
    Sun, S. S., McDonough, W. F., Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes, Magmatism in the Ocean Basin (ed. Saunders, A. D., Norry, M. J.), Geol. Soc. Special Publ., 1989, (42): 313.Google Scholar
  23. 23.
    Li, S. G., The Ba−Th−Nb−La diagrams for the discrimination of ophiolitic tectonic settings, Acta Petrologica Sinica (in Chinese), 1993, 9(2): 146.Google Scholar
  24. 24.
    Hergt, J. M., Peate, D. W., Hawkesworth, C. J., The petrogenesis of Mesozoic Gondwana low-Ti flood basalts, Earth Planet Sei. Lett., 1991, 105: 134.CrossRefGoogle Scholar
  25. 25.
    Viramonte, J. G., Kay, S. M., Becchio, R. et al., Cretaceous rift related magmatism in central western south America, Journal of South American Earth Sciences, 1999, 12: 109.CrossRefGoogle Scholar
  26. 26.
    Wilson, M., Igneous Petrogenesis, London: Unwin Hyman Press, 1989, 153.CrossRefGoogle Scholar
  27. 27.
    Feng, Q. L., Du, Y. S., Yin, H. F. et al., Carboniferous radiolaria fauna firstly discovered in Mian-Lue ophiolitic mélange belt of south Qinling mountains, Science in China, Series D, 1996, 39(Suppl.): 87.Google Scholar
  28. 28.
    Li, S. G., Sun, W. D., Zhang, G. W. et al., Chronology and geochemistry of metavolcanic rocks from Heigouxia Valley in the Mianlue tectonic zone, South Qinling-Evidence for a Paleozoic oceanic basin and its close time, Science in China, Series D, 1996, 39(3): 301.Google Scholar
  29. 29.
    Li, J. Y., Wang, Z. Q., Zhao, M.,40Ar/39Ar thermochronological constraints on the timing of collisional orogeny in the Mian Lue collision belt, southern Qinling Mountains, Acta Geologica Sinica, 1999, 73(2): 208.Google Scholar
  30. 30.
    Yoshiyuki, T., Steve, E., Subduction Zone magmatism, Oxford: Oxford University Press, 1995, 1.Google Scholar
  31. 31.
    Middlemost, E. A. K., Magmas, Rocks and Planetary Development, Singapore: Longman Singapore Publishers Ltd., 1997, 177.Google Scholar
  32. 32.
    Nathan, L. G., Dennis, L. H., On the relationship between subducted slab age and arc basalt petrogenesis, Cascadia subduction system, North America, Earth and Planetary Sci. Lett., 1999, 171: 367.CrossRefGoogle Scholar

Copyright information

© Science in China Press 2000

Authors and Affiliations

  • Lai Shaocong 
    • 1
  • Zhang Guowei 
    • 1
  • Yang Ruiying 
    • 2
  1. 1.Department of GeologyNorthwest UniversityXi'anChina
  2. 2.Institute of High Energy PhysicsChinese Academy of SciencesBeijingChina

Personalised recommendations