Chinese Science Bulletin

, Volume 51, Issue 8, pp 952–962 | Cite as

SHRIMP zircon U-Pb dating for subduction-related granitic rocks in the northern part of east Jungaar, Xinjiang

  • Zhang Zhaochong 
  • Yan Shenghao 
  • Chen Bailin 
  • Zhou Gang 
  • He Yongkang 
  • Chai Fengmei 
  • He Lixin 
  • Wan Yusheng 
Articles

Abstract

SHRIMP U-Pb zircon dating on the Xileketehalasu granodiorite porphyry and Kalasayi monodiorite porphyry that intrude middle Devonian Beitashan Formation at the north part of east Junggar region shows that they were formed at 381 ±6 Ma and 376±10 Ma respectively. They are interpreted as subduction-related granitic rocks, which is the first report that the isotopic ages for the granitic rocks range from 350 to 390 Ma. Another determined age for the Kalasayi monodiorite porphyry is 408±9 Ma, representing the age of underlain Lower Devonian volcanic rocks. Thus, the U-Pb dates suggest that the northeastward subduction of Junggar ocean from southwest occurred at 408 to 376 Ma (the real interval may be larger). Because the ore-bearing porphyry intruded following the formation of the volcanic rocks of middle Devonian Beitashan Formation, their tectonic setting is similar to the Andes Mountains that hosts world-class porphyry copper deposits, and the researched area could be regarded as a potential area for prospecting large porphyry copper deposits.

Keywords

SHRIMP U-Pb zircon age subduction granitic porphyry east Jungaar 

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References

  1. 1.
    Xiao X, Tang Y, Feng Y, et al. The Tectonics in the Northern Xinjiang and Its Adjacent Area (in Chinese). Beijing: Geological Publishing House, 1992Google Scholar
  2. 2.
    He G, Li M S, Liu D Q, et al. Paleozoic Crustal Evolution and Mineralization in Xinjiang of China (in Chinese). Urumqi: Xinjiang People’s Publishing House, 1994Google Scholar
  3. 3.
    Ren J, Wang Z, Chen B, et al. Tectonics of China from the Global (in Chinese). Beijing: Geological Publishing House, 1999Google Scholar
  4. 4.
    Han B, He G, Wang S. Postcollisional mantle-derived magmatism, underplating and implications for basement of the Junggar Basin. Sci China Ser D-Earth Sci, 1999, 42(2): 113–119Google Scholar
  5. 5.
    Chen B, Arakawa Y. Elemental and Nd-Sr isotopic geochemistry of granitoids from the West Junggar foldbelt (NW China), with implications for Phanerozoic continental growth. Geochimica et Cosmochimical Acta, 2005, 69: 1307–1320Google Scholar
  6. 6.
    Chen B, Jahn B M. Genesis of post-collisional granitoids and basement nature of the Junggar Terrane, NW China: Nd-Sr isotope and trace element evidence. Journal of Asian Earth Sciences, 2004, 23: 691–703CrossRefGoogle Scholar
  7. 7.
    Windley F B, Kroner A, Gao J, et al. Neoproterozoic to Paleozoic geology of the Altai orogen, NW China: New zircon age data and tectonic evolution. The Journal of Geology, 2002: 110: 719–737CrossRefGoogle Scholar
  8. 8.
    Sengor A M C, Natal’in B A, Burtman V S. Evolution of the Altaid tectonic collage and Paleozoic crustal growth in Eurasia. Nature, 1993, 364: 299–307Google Scholar
  9. 9.
    Li J, Xiao W, Wang K, et al. Neoproterozoic to Paleozoic tectonostratigraphy, magmatic activies and tectonic evolution of eastern Xinjiang, NW China. In: Mao J, Goldfarb R J, Seltmann R, et al. eds. Tectonic Evolution and Metallogeny of the Chinese Altay and Tianshan (eds.), London: IAGOD Guidebook Series, 2003, 10: 31–74Google Scholar
  10. 10.
    Xiao W, Windley B F, Badarch G, et al. Palaeozoic accretionary and convergent tectonics of the southern Altaids: implications for the growth of Central Asia. Journal of the Geological Society, London. 2004, 161: 339–342Google Scholar
  11. 11.
    Wang D, Deng J. Characteristics and evolution of the plate tectonics in eastern Junggar, Xinjiang. Journal of Chengdu Institute of Technology (in Chinese), 1995, 22(4): 38–45Google Scholar
  12. 12.
    Li J. On evolution of Paleozoic plate tectonics of east Junggar, Xinjiang, China. In: Xiao X, Tang Y. eds. Tectonic Evolution of the Southern Margin of the Paleo-Asian Composite Megasuture (in Chinese). Beijing: Beijing Scientific and Technical Publishing House, 1991, 92–108Google Scholar
  13. 13.
    Yang W, Zhang Z, Zhou G, et al. Discovery of the Xileketehalsu porphyry copper deposit in the south margin of the Altay metallogenic belt. Geology in China (in Chinese), 2005, 32: 107–114Google Scholar
  14. 14.
    Campston W, Williams I S, Meyer C. U-Pb geochronology of zircons from lunar braccia 73217 using a sensitive high mass-resolution ion microprobe. Journal of Geophysical Research, 1984, 89(B): 525–534Google Scholar
  15. 15.
    Williams I S. Some observations on the use of zircon U-Pb geochronology in the study of granitic rocks. Trans R Soc Edinburgh-Earth Sci., 1992, 83: 447–458Google Scholar
  16. 16.
    Belousova E A, Griffin W L, O’Reilly S Y, et al. Igneous zircon: trace element composition as an indicator of source rock type. Contribution to Mineralogy and Petrology, 2002, 143: 602–622Google Scholar
  17. 17.
    Wang F, Ma T, Liu G. Metallogeny and Prospecting Model of the Kalatongke Cu-Ni-Au Ore Belt in Xinjiang (in Chinese). Beijing: Geological Publishing House, 1992Google Scholar
  18. 18.
    Zhang H X, Niu H C, Hiroaki S, et al. Late Paleozoic adakite and Nb-enriched basalt from northern Xinjiang: Evidence for the southward subduction of the Paleo-Asian Ocean, Geological Journal of China Universities (in Chinese), 2004, 10(1): 106–113Google Scholar
  19. 19.
    Zhang Z, Yan S, Chen B, et al. Geochemistry of the middle dovenian picritic rocks of the south margin of Altay Orogenic Belt: Implications for the tectonic setting and petrogenesis. Journal of China University of Geosciences, 2005, 30(3): 289–297Google Scholar
  20. 20.
    Yu X Y, Mei H J, Yang X C, et al. Volcanic rocks and tectonic evolution of the Irytish region. In: Tu G C. ed. New Progress of Solid Earth Sciences of the Northern Xinjiang (in Chinese). Beijing: Science Press, 1993, 185–198Google Scholar
  21. 21.
    Chappell B W, White A J R. Two contrasting granite types. Pacific Geology, 1974, 3: 173–174Google Scholar
  22. 22.
    Rogers J J W, Greenberg J K. Late-orogenic, post-orogenic, and anorogenic granites: distinction by major-element and trace-element chemistry and possible origins. Journal of Geology, 1990, 98: 291–309Google Scholar
  23. 23.
    Holtz F, Barrey P. Genesis of peraluminous granites, II. Mineralogy and chemistry of the tourem complex (North Portugal)-sequential melting vs restite unmixing. Journal of Petrology, 1991, 32: 959–978Google Scholar
  24. 24.
    Pearce J A, Harris N B W, Tindle A G. Trace element discrimination diagrams for the tectonic interpretation of granitic rocks. Journal of Petrology, 1984, 25: 956–983Google Scholar
  25. 25.
    Sun S S, McDonough W F. Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. In: Saunders A D, Norry M J. eds. Magmatism in the Ocean Basins. Geological Society, Special Publication, London, 1989, 42: 313–345Google Scholar
  26. 26.
    Jian P, Liu D, Zhang Q, et al. SHRIMP dating of ophiolite and leucocratic rocks within ophiolite. Earth Science Frontiers (in Chinese), 2003, 10(4): 439–456Google Scholar
  27. 27.
    Xu J F, Mei H J, Yu X Y, et al. Adakites related to subduc-tion in the northern margin of Junggar arc for the Late Paleozoic: products of slab melting, Chin Sci Bull, 2001, 46(15): 1312–1316Google Scholar
  28. 28.
    Zhang H X, Niu H C, Terada K, et al. Zircon SHRIMP U-Pb dating on plagiogranite from Kuerti ophiolite in Altay, north Xinjiang, Chin Sci Bull, 2003, 48(20): 2231–2235Google Scholar
  29. 29.
    Xu J F, Chen F R, Yu X Y, et al. Kuerti ophiolite in Altay area of north Xinjiang: magmatism of an ancient back-arc basin. Acta Petrologica et Mineralogica, 2001, 20(3): 344–352Google Scholar
  30. 30.
    Camus F, Dilles J H. A special issue devoted to porphyry copper deposits of northern Chile-Preface. Economic Geology, 2001, 96: 233–238CrossRefGoogle Scholar
  31. 31.
    Hu A, Wei G. A review of ages of basement rocks from Junggar basin in Xinjiang, China—Based on studies of geochronology. Xinjiang Geology (in Chinese), 2003, 21(4): 398–406Google Scholar

Copyright information

© Science in China Press 2006

Authors and Affiliations

  • Zhang Zhaochong 
    • 1
    • 2
  • Yan Shenghao 
    • 3
  • Chen Bailin 
    • 4
  • Zhou Gang 
    • 5
  • He Yongkang 
    • 5
  • Chai Fengmei 
    • 1
  • He Lixin 
    • 5
  • Wan Yusheng 
    • 2
  1. 1.State Key Laboratory of Geological Processes and Mineral ResourcesChina University of GeosciencesBeijingChina
  2. 2.Institute of GeologyChinese Academy of Geological SciencesBeijingChina
  3. 3.Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijingChina
  4. 4.Institute of GeomechanicsChinese Academy of Geological SciencesBeijingChina
  5. 5.No. 4 Geological PartyXinjiang Bureau of Geology and Mineral ResourcesAltayChina

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