Zircon U-Pb Age, Geochemistry and geological implication of the 255 Ma Alkali-rich dykes from Ulungur Area, North Xinjiang

详细信息    查看全文

• 作者：Yanfei Chen (1) (2)
  Yuwang Wang (2)
  Jingbin Wang (2)
  Rufu Ding (2)
  Yuelei Yuan (3)
  Yu Shi (1) (2)
  
• 关键词：Ulungur ; alkali ; rich dyke ; zircon U ; Pb age ; petrology and geochemistry ; tectonic setting ; post ; collision
• 刊名：Journal of Earth Science
• 出版年：2013
• 出版时间：August 2013
• 年：2013
• 卷：24
• 期：4
• 页码：519-528
• 全文大小：728KB
• 参考文献：1. Batchelor, R. A., Bowden, P., 1985. Petrogenetic Interpretation of Granitoid Rock Series Using Multicationic Parameters. / Chemical Geology, 48(1-): 43-5 CrossRef
  2. Black, L. P., Kamo, S. L., Allen, C. M., et al., 2004. Improved ²⁰⁶Pb/²³⁸U Microprobe Geochronology by the Monitoring of a Trace-Element Related Matrix Effect: SHRIMP, ID-TIMS, ELA-ICP-MS, and Oxygen Isotope Documentation for a Series of Zircon Standards. / Chemical Geology, 205: 115-40 CrossRef
  3. Boynton, W. V., 1984. Cosmochemistry of the Rare Earth Elements: Mete-Orite Studies. / Developments in Geochemistry, 2: 63-14 CrossRef
  4. Eby, G. N., 1990. The A-Type Granitoids: A Review of Their Occurrence and Chemical Characteristics and Speculations on Their Petrogenesis. / Lithos, 26: 115-34 CrossRef
  5. Eby, G. N., 1992. Chemical Subdivision of the A-Type Granitoids: Petrogenetic and Tectonic Implications. / Geology, 20: 641-44, doi:10.1130/0091-7613(1992)020<0641:CSOTAT>2.3.CO;2 CrossRef
  6. Feng, Q. W., Li, J. T., Liu, J. F., et al., 2012. Ages and Geological Significance of the Dark Dykes Emplaced in the Karamay Pluton and Adjacent Area, in Western Junggar, Xinjiang, NW China: Evidence from LA-ICP-MS Zircon Chronology and Ar-Ar Amphibole Chronology. / Acta Petrologica Sinica, 28(7): 2158-170 (in Chinese with English Abstract)
  7. Gan, L., Tang, H. F., Han, Y. J., 2010. Geochronology and Geochemical Characteristics of the Yemaquan Granitic Pluton in East Junggar, Xinjiang. / Acta Petrologica Sinica, 26(8): 2374-388 (in Chinese with English Abstract)
  8. Han, B. F., Ji, J. Q., Song, B., et al., 2006. Late Paleozoic Vertical Growth of Continental Crust around the Junggar Basin, Xinjiang, China (Part I): Timing of Post-Collisional Plutonism. / Acta Petrologica Sinica, 22(5): 1077-086 (in Chinese with English Abstract)
  9. Han, B. F., 2007. Diverse Post-Collisional Granitoids and Their Tectonic Setting Discrimination. / Earth Science Frontiers, 14(3): 64-2 (in Chinese with English Abstract)
  10. Han, B. F., Guo, Z. J., He, G. Q., 2010. Timing of Major Suture Zones in North Xinjiang, China: Constraints from Stitching Plutons. / Acta Petrologica Sinica, 26(8): 2233-246 (in Chinese with English Abstract)
  11. Harris, A. C., Allen, C. M., Bryan, S. E., et al., 2004. ELA-ICP-MS U-Pb Zircon Geochronology of Regional Volcanism Hosting the Bajodela Alumbrera Cu-Au Deposit: Implications for Porphyry-Related Mineralization. / Mineralium Deposita, 39: 46-7 CrossRef
  12. Hong, D. W., Wang, S. G., Han, B. F., et al., 1995. The Tectonic Environment Classification and Identification Signs of Alkali Granite. / Science in China Series D: Earth Sciences, 25(4): 418-26 (in Chinese)
  13. Jung, S., Mezger, K., Hoernes, S., 1998. Petrology and Geochemistry of Syn- to Post-Collisional Metaluminous A-Type Granites-A Major and Trace Element and Nd-Sr-Pb-O-Isotope Study from the Proterozoic Damara Belt, Namibia. / Lithos, 45: 147-75 CrossRef
  14. Li, Z. H., Han, B. F., Song, B., 2004. SHRIMP Zircon U-Pb Dating of the Ertaibei Granodiorite and Its Enclaves from Eastern Junggar, Xinjiang, and Geological Implications. / Acta Petrologica Sinica, 20(5): 1263-270 (in Chinese with English Abstract)
  15. Liu, J. Y., Yuan, K. R., 1996. A Discussion on the Genesis and Tectonic Setting of Alkali Granites in the Wulungu Alkali-Rich Granite Belt, Xinjiang. / Guilin Institute of Technology, 2(3): 257-72 (in Chinese with English Abstract)
  16. Liu, S., Yuan, K. R., 1995. The Geological Characteristics of Wulungu High-Alkline Granite Belt, Xinjiang. / Journal of Guilin Institute of Technology, 15(3): 243-51 (in Chinese with English Abstract)
  17. Liu, Z. Q., Han, B. F., Ji, J. Q., et al., 2005. Ages and Geochemistry of the Post-Collisional Granitic Rocks from Eastern Alataw Mountains, Xinjiang, and Implications for Wertical Crustal Growth. / Acta Petrologica Sinica, 21(3): 623-39 (in Chinese with English Abstract)
  18. Ludwig, K. R., 2003. User’s Manual for ISOPLOT 3.00: A Geochronological Toolkit for Microsoft Excel. / Berkeley Geochronology Center (Spec. 4): 71
  19. Pearce, J. A., 1982. Trace Element Characteristics of Lavas from Destructive Plate Boundaries. In: Thorpe, R. S., ed., Orogenic Andesites and Related Rocks. John Wiley and Sons, Chichester. 525-48
  20. Pearce, J. A., Lippard, S. J., Roberts, S., 1984. Characteristics and Tectonic Significance of Super-Subduction Zone Ophiolites. In: Kokelaar, B. P., Howells, M. F., eds., Marginal Basin Geology. / The Geological Society, London, Special Publication, 16: 77-4, doi:10.1144/GSLSP.1984.016.01.06 CrossRef
  21. Qiu, L., Wei, C. J., Lou, Y. X., et al., 2007. Characteristics and Petrogenetic Simulation of Leucogranitic Veins in the Altay High-Grade Metamorphic Zones, Xinjiang. / Acta Petrologica et Mineralogica, 26(1): 27-4 (in Chinese with English Abstract)
  22. Wang, J. B., Xu, X., 2006. Post-Collisional Tectonic Evolution and Metallogenesis in Northern Xinjiang, China. / Acta Geologica Sinica, 80(1): 23-1 (in Chinese with English Abstract)
  23. Wang, J. B., Wang, L. J., Wang, Y. W., et al., 2006. Yemaquan Gold Deposits: A Structurally-Controlled-Altered-Dyke Type in Eastern Junggar, Xinjiang. / Acta Petrologica Sinica, 22(9): 2349-359 (in Chinese with English Abstract)
  24. Wang, S. G., Han, B. F., Hong, D. W., et al., 1994. Geochemistry and Tectonic Significance of Alkali Granites along Ulungur River, Xinjiang. / Scientia Geologica Sinica, 29(4): 373-83 (in Chinese with English Abstract)
  25. Wang, Y. W., Wang, J. B., Long, L. L., et al., 2012a. Tectonic Evolution Stages of North Xinjiang and Tectonic Types of Porphyry-Epithermal Deposit. / Geology in China, 39(3): 695-16 (in Chinese with English Abstract)
  26. Wang, Y. W., Wang, J. B., Wang, L. J., et al., 2012b. The Tuerkubantao Ophiolite Melange in Xinjiang, NW China: New Evidence for the Erqis Suture Zone. / Geoscience Frontiers, 3(5): 587-02, doi:10.1016/j.gsf.2012.02.002 CrossRef
  27. Whalen, J. B., Currie, K. L., Chappell, B. W., 1987. A-Type Granites: Geochemical Characteristics, Discrimination and Petrogenesis. / Contributions to Mineralogy and Petrology, 95(4): 407-19 CrossRef
  28. Wu, Y. B., Zheng, Y. F., 2004. Study on the Genetic Mineralogy of Zircon and Its Restricting for Explanation of U-Pb Age. / Chinese Science Bulletin, 49(16): 1589-604 (in Chinese)
  29. Xin, J. G., Yuan, K. R., Liu, J. Y., 1995. The Alkali Granites and Their Genesis and Tectonic Significance in the North Area of the East Junggar, Xinjiang. / Gerotectonica et Metallogenia, 19(3): 214-26 (in Chinese with English Abstract)
  30. Xu, Q. Q., Ji, J. Q., Han, B. F., et al., 2008. Petrology, Geochemistry and Geochronology of the Intermediate to Mafic Dykes in Northern Xinjiang since Late Paleozoic. / Acta Petrologica Sinica, 24(5): 977-96 (in Chinese with English Abstract)
  31. Yang, G. X., Li, Y. J., Si, G. H., et al., 2010. LA-ICP-MS Zircon U-Pb Dating of Kubusunan Granodiorite and the Enclaves from Kalamaili Area in Eastern Junggar, Xinjiang, and Its Geological Implications. / Earth Science-Journal of China University of Geosciences, 35(4): 597-10, doi:10.3779/dqkx.2010.075 (in Chinese with English Abstract) CrossRef
  32. Zhang, D. Y., Gao, Y., Su, H. M., et al., 2007. The Zaheba-High-Alkali Granites, Their Mineral Chemistry and Physico-Chemical Conditions in the North Part of the East Junggar, Xinjiang. / Mineral. Petrol., 27(4): 30-8 (in Chinese with English Abstract)
  33. Zhao, Z. H., Wang, Z. G., Zou, T. R., 1996. Study on Petrogenesis of Alkali-Rich Intrusive Rocks of Ulungur, Xinjiang. / Geochimica, 25(3): 205-20 (in Chinese with English Abstract)
  34. Zhou, J., Ji, J. Q., Han, B. F., et al., 2008. ⁴⁰Ar/³⁹Ar Geochronology of Mafic Dykes in North Xinjiang. / Acta Petrologica Sinica, 24(5): 997-010 (in Chinese with English Abstract)
  35. Zhou, N. W., Guo, X. C., He, G. L., 2012. LA-ICP-MS Zircon U-Pb Ages of Two Types of Ore-Bearing Dykes in the Tuokuzibayi Gold Ore District in Habahe Area of Xinjiang and Geological Significance. / Geological Bulletin of China, 31(5): 707-15 (in Chinese with English Abstract)
  
• 作者单位：Yanfei Chen (1) (2)
  Yuwang Wang (2)
  Jingbin Wang (2)
  Rufu Ding (2)
  Yuelei Yuan (3)
  Yu Shi (1) (2)
  
  1. School of Gemmology, China University of Geosciences, Beijing, 100083, China
  2. Beijing Institute of Geology for Mineral Resources, Beijing, 100012, China
  3. School of Earth Sciences and Mineral Resources, China University of Geosciences, Beijing, 100083, China
  
• ISSN：1867-111X

文摘

Alkali-rich dykes of the Late Permian in Ulungur ( area are representative products of granitic magmatism in the evolution of the Paleozoic orogenic belt in the East Junggar (, North Xinjiang (). We selected two representative samples for geochemical analysis (major and trace elements), and twenty-two zircon grains for zircon dating. Isoplot (ver3.0) was used to calculate isotopic age and make concordia diagrams. This study shows that the trachy porphyry dykes, featuring low concentration of Al2O3, CaO, MgO and high alkali contents, are metaluminous alkaline rock and belong to A-type granitoids. The dykes have low concentration of the REE and incompatible elements, and the REE patterns show clear negative Eu anomalies (δEu=0.74-.58), enriched LREE (LREE/HREE>4, (La/Yb)N=5.97-.63) and undifferentiated HREEs. Similar normalized REE and incompatible element patterns are also showed in the dykes from Yemaquan ( and granites from Ulungur, suggesting that they are possibly originated from the same source and formed in the same tectonic environment, but the trachy porphyry dykes are more evolved. The age of the trachy porphyry dykes is 255.3±2.4 Ma, which is probably the crystallization time of the trachy porphyry. The dykes formed in late-orogenic phase of post-collision process or within-plate environment, which suggested that the trachy porphyry dykes possibly crystallized in the transition period during which the tectonic setting changed from post-collision to within-plate environment. So we consider that the age when the post-collision ended and the crustal cratonization begun in the East Junggar is 255 Ma, Late Permian.