Advertisement

Characteristics of soure region and tectonic implications of Early Indosinian Weiya gabbroic rock, eastern Tianshan mountains

  • Zun-zhong Zhang (张遵忠)
  • Lian-xing Gu (顾连兴)Email author
  • Chang-zhi Wu (吴昌志)
  • Yi Shao (邵毅)
  • Jian-rong Xu (许建荣)
  • Jian-ping Zhai (翟建平)
  • Yuan-chuan Zheng (郑远川)
  • Jun-hua Tang (唐俊华)
  • Chuan-sheng Wang (汪传胜)
  • Jin-zhu San (三金柱)
Article

Abstract

Based on the detailed petrographic study, the characteristics of source region of the Weiya gabbro and tectonic implications were studied. The results show that the gabbroic rock consists mainly of gabbro, with less amount of ultra-mafic rocks. The ultra-mafic rocks show cumulate texture and are gradually transitional contact with gabbro, indicating that they are cumulate products of parental magma. The ultra-mafic rocks consist mainly of spinel periodite and spinel clinopyroxenite. The former is mainly composed of olivine (65%–70%), spinel (10%–15%), hornblende (5%–10%) and phlogopite (5%–10%); the latter consists mainly of clinopyroxene (70%–80%), spinel (15%–20%) and phlogopite (0–10%), with minor amounts of carbonate (0–2%). No olivine or orthopyroxene is found. The gabbro is composed mainly of clinopyroxene (35%–40%), plagioclase (An 55–65, 40%–45%), hornblende (5%–15%), with variable amounts of carbonate (0–5%). Petrographic observations show that the source region of the Weiya gabbroic rock is water-rich due to intensive intra-continental A-type subduction occurring in this region during late Permian to early Triassic.

Key words

petrography gabbro indosinian Weiya eastern Tianshan 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Refreences

  1. [1]
    WINTER J D. An introduction to igneous and metamorphic petrology[M]. New Jersey: Prince-Hall Inc, 2001.Google Scholar
  2. [2]
    NIU Y, GILMORE T, MACKIE S. Mineral chemistry, whole-rock compositions and petrogenesis of ODP Leg 176 gabbros: Data and discussion[J]. Proc Ocean Drill Prog Sci Results, 2002, 176: 1–60.Google Scholar
  3. [3]
    NIU Y L. Generation and evolution of basaltic magmas: some basic concepts and a new view on the origin of Mesozoic-Cenozoic basaltic volcanism in eastern China[J]. Geological Journal of China Universities, 2005, 11(1): 9–46.Google Scholar
  4. [4]
    ZHANG Zun-zhong, GU Lian-xing, WU Chang-zhi, WU Hua, XI Ai-hua, TANG Jun-hua. Zircon geochemistry of different intrusive phases of Weiya pluton: Implications for magma genesis [J]. J Cent South Univ Technol, 2005, 12(4): 472–476.CrossRefGoogle Scholar
  5. [5]
    Institute of Geology, Chinese Academy of Sciences. Tectonic outline of China[M]. Beijing: Science Press, 1959: 320. (in Chinese)Google Scholar
  6. [6]
    HU B, WANG J B, GAO Z J, LU Q, FANG X T. Several problems of tectonic evolution in Xinjiang[J]. Acta Geol Sin, 1964, 44(2): 156–170. (in Chinese)Google Scholar
  7. [7]
    HU Ai-qing, WANG Zhong-gang, TU Guang-chi. Geological evolution, petrogenesis and metallogeny of north Xinjiang[M]. Beijing: Science Press, 1997. (in Chinese)Google Scholar
  8. [8]
    HU S X, GUO J C, GU L X, ZHOU X Z, YAN Z F, YANG H. Geology of the Caledonian orogenic belt and its important to the framework of East Tianshan (E85°–95°)[J]. Geoscience of Xinjiang, 1990(1): 32–45. (in Chinese)Google Scholar
  9. [9]
    GU Lian-xing, YANG Hao, TAO Xian-cong, YAN Zheng-fu, LI Hui-min, WANG Jin-zhu, LIU Yan-dong. Rb-Sr geochronology and the tectonic evolution of the east section of the Middle Tianshan Mountains[J]. Journal of Guilin College of Geology, 1990, 10(1): 49–55. (in Chinese)Google Scholar
  10. [10]
    WU Chang-zhi, ZHANG Zun-zhong, KHIN Z, DELLA-PASQUE F TANG Jun-hua, ZHENG Yuan-chuan, WANG Chuan-sheng, SAN Jin-zhu. Geochronology, geochemistry and tectonic significances of the Hongyuntan granitoids in the Qoltag area, Eastern Tianshan[J]. Acta Petrol Sin, 2006, 22(5): 1121–1134. (in Chinese)Google Scholar
  11. [11]
    LI J Y, XIAO W J, WANG K Z, SUN G H, GAO L M. Neoproterozoic-Paleozoic tectonostratigraphy, magmatic activities and tectonic evolution of Eastern Xinjiang, NW China [C]// MAO Jin-wen, GOLDFARB R J, SELTMANN R, WANG Deng-hong, XIAO Wen-jiao, HART C. Tectonic Evolution and Metallogeny of the Chinese Altay and Tianshan. London: CERCAMS/NHM, 2003: 31–74.Google Scholar
  12. [12]
    SHU Liang-shu, CHARVET J, GUO Lin-zhi, LU Hua-fu, LAURENT-CHARVET S. A large-scale Palaeozoic dextral ductile strike-slip zone: The Aqqikkudug-Weiya zone along the Northern margin of the Central Tianshan belt, Xinjiang, NW China[J]. Acta Geol Sin, 1999, 73(2): 148–162.CrossRefGoogle Scholar
  13. [13]
    ZHANG Zun-zhong, GU Lian-xing, WU Chang-zhi, LI Wei-qiang, XI Ai-hua, WANG Shuo. Zircon SHRIMP dating for the Weiya pluton, eastern Tianshan: Its geological implications[J]. Acta Geol Sin, 2005, 79(4): 481–490.CrossRefGoogle Scholar
  14. [14]
    LI Song-ling, FENG Xin-chang. Super-unit association of Weiya, eastern Tianshan of Xinjiang[J]. Xinjiang Geology, 1997, 15(1): 13–27. (in Chinese)Google Scholar
  15. [15]
    NIU Y, O’HARA M J, PEARCE J A. Initiation of subduction zones as a consequence of lateral compositional buoyancy contrast within the lithosphere: A petrological perspective[J]. J Petrol, 2003, 44: 851–866.CrossRefGoogle Scholar
  16. [16]
    LANGMUIR C H, KLEIN E M, PLANK T. Petrological systematics of mid-ocean ridge basalts: Constraints on melt generation beneath ocean ridges[J]. Geophys Monogr, 1992, 71: 183–280.Google Scholar
  17. [17]
    DENG J F, MO X X, ZHAO H L, WU Z X, LUO Z X, SU S G. A new model for the dynamic evolution of Chinese lithosphere: Continental roots-plume tectonics[J]. Earth Sci Rev, 2004, 65: 223–275.CrossRefGoogle Scholar
  18. [18]
    YODER H S J. Diopside-anorthite-water at fine and ten kilobars and its bearing on explosive volcanism[M]. Washington: Carnegie Institute, 1965: 487–505.Google Scholar
  19. [19]
    ZHANG Zun-zhong, GU Lian-xing, WU Chang-zhi, ZHAI Jian-ping, LI Wei-qiang, TANG Jun-hua. Early Indosinian Weiya gabbro in eastern Tianshan, China: Elemental and Sr-Nd-O isotopic geochemistry, and its tectonic implications[J]. Acta Geol Sin, 2007, 81(3): 424–432.CrossRefGoogle Scholar
  20. [20]
    GU Lian-xing, ZHANG Zun-zhong, WU Chang-zhi, WANG Yin-xi, TANG Jun-hua, WANG Chuan-sheng, XI Ai-hua, ZHENG Yuan-chuan. Some problems on granites and vertical growth of the continental crust in the eastern Tianshan mountains, NW China[J]. Acta Petrol Sin, 2006, 22(5): 1103–1120. (in Chinese)Google Scholar
  21. [21]
    XU Zhi-qin, YANG Jin-sui, JIANG Mei. Collision-orogeny of the northern Qinghai-Tibet plateau and its deep dynamics[J]. Acta Geo Sin, 2001, 22(1): 5–10. (in Chinese)Google Scholar
  22. [22]
    JIANG Si-hong, NIE Feng-jun, CHEN Wen, LIU Yan, BAI Da-ming, LIU Xin-yu, ZHANG Si-hong. The determination of the emplacement age of granite in Mingshui, Beishan area, and its implication[J]. Acta Petrologica et Mineralogica, 2003, 22(2): 107–111 (in Chinese).Google Scholar
  23. [23]
    LI Hua-qin, CHEN Fu-wen, LU Yuan-fa, YANG Hong-mei, GUO Jing, MEI Yu-ping. New chronological evidence for Indosinian diagenetic mineralization in eastern Xinjiang, NW China[J]. Acta Geol Sin, 2005, 79(2): 264–275.CrossRefGoogle Scholar
  24. [24]
    GUO Zheng-fu, DENG Jin-fu, XU Zhi-qin, MO Xuan-xue, LUO Zhao-hua, Late Palaeozoic-Mesozoic intracontinental orogenic process and intermedate acidic ingeous rocks from the eastern Kunlun mountains of north western China[J]. Geoscience, 1998, 12(3): 344–352. (in Chinese)Google Scholar
  25. [25]
    ZHANG Zun-zhong, GU Lian-xing, WU Chang-zhi, ZHAI Jian-ping, XI Ai-hua, LI Wei-qiang, TANG Jun-hua. The quartz syenite within the Weiya complex from the eastern Tianshan: Petrography, geochemistry and petrogenesis[J]. Acta Petrol Sin, 2006, 22(5): 1135–1149. (in Chinese)Google Scholar
  26. [26]
    XIAO Xu-chang, TANG Yao-qing, FENG Yi-min, ZHU Bao-qing, LI Jin-yi, ZHAO Min. Tectonic evolution of northern Xinjiang and its adjacent regions[M]. Beijing: Geological Publishing House, 1992: 169. (in Chinese)Google Scholar
  27. [27]
    LI Jin-yi, XIAO Xu-chang. Brief reviews on some issues of framework and tectonic evolution of Xinjiang crust, NW China[J]. Scientia Geologica Sinica, 1999, 34(4): 405–419. (in Chinese)MathSciNetGoogle Scholar
  28. [28]
    LI Shu-guang, NIE Yong-hong, LIU De-liang, ZHENG Shuang-gen. Interaction between subducted continental crust and the mantle (I): Major and trace element geochemistry of the syncollisional mafic-ultramafic intrusions in the Dabie Mountains[J]. Science in China: Series D, 1998, 41(5): 545–552.CrossRefGoogle Scholar

Copyright information

© Central South University 2008

Authors and Affiliations

  • Zun-zhong Zhang (张遵忠)
    • 1
    • 2
    • 3
  • Lian-xing Gu (顾连兴)
    • 1
    • 2
    Email author
  • Chang-zhi Wu (吴昌志)
    • 2
  • Yi Shao (邵毅)
    • 1
    • 2
  • Jian-rong Xu (许建荣)
    • 1
    • 2
  • Jian-ping Zhai (翟建平)
    • 4
  • Yuan-chuan Zheng (郑远川)
    • 2
  • Jun-hua Tang (唐俊华)
    • 2
  • Chuan-sheng Wang (汪传胜)
    • 2
  • Jin-zhu San (三金柱)
    • 5
  1. 1.East China Mineral Exploration and Development Bureau for Non-ferrous MetalsNanjingChina
  2. 2.State Key Laboratory of Mineral Deposit Research, Department of Earth SciencesNanjing UniversityNanjingChina
  3. 3.State Key Laboratory of Continental DynamicsNorthwest UniversityXi’anChina
  4. 4.School of EnvironmentNanjing UniversityNanjingChina
  5. 5.No. 704 Brigade of Xinjiang Geoexploration Bureau for Non-ferrous MetalsHamiChina

Personalised recommendations