Volume 37 Issue 5
Sep.  2012
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Article Navigation >  Earth Science  > 2012  >  37(5): 929-936
YANG Jun-quan, WAN Yu-sheng, LIU Yong-shun, XIN Hou-tian, ZHANG Su-rong, Li Ming-ze, 2012. Discovery of Paleoproterozoic Crustally Derived Carbonatite in the Northern Altyn Tagh. Earth Science, 37(5): 929-936. doi: 10.3799/dqkx.2012.101
Citation: YANG Jun-quan, WAN Yu-sheng, LIU Yong-shun, XIN Hou-tian, ZHANG Su-rong, Li Ming-ze, 2012. Discovery of Paleoproterozoic Crustally Derived Carbonatite in the Northern Altyn Tagh. Earth Science, 37(5): 929-936. doi: 10.3799/dqkx.2012.101
shu

Discovery of Paleoproterozoic Crustally Derived Carbonatite in the Northern Altyn Tagh

doi: 10.3799/dqkx.2012.101
  • 1.

    School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083

  • 2.

    Tianjin Institute of Geology and Mineral Resources, Tianjin 300170

  • 3.

    Beijing SHRIMP Center, Insitute of Geology, Chinese Academy of Geological Sciences, Beijing 100037

  • Received Date: 2011-10-22
    Available Online: 2021-11-10
  • Publish Date: 2012-09-15
    Abstract
  • This paper reports whole-rock geochemical compositions and zircon dating results of late Paleoproterozoic crustally-derived carbonatite in the northern Altyn Tagh. The carbonatite cuts contry rocks and occurs as stocks or dikes and contains different types of contry rocks. It is mainly composed of calcite, diopside, and a few silicate minerals (such as, feldspar, quartz, etc.). Samples of the carbonatite are characterized with high CaO contents (20.56%-39.80%), a large range of SiO2 contents (23.33%-54.06%), low TREE (28.36×10-6-63.01×10-6), weakly negative Eu anomalies (Eu/Eu*=0.69-0.83), moderately fractionated REE patterns ((La/Yb)n=9.20-16.85). Compared with Sr, Rb, Ba, Th (LILE), the high field strength elements (HFSE), especially Nb, Ti and P, are strongly depleted. Zircons of the carbonatite show core-rim textures, and commonly show weakly zoning. SHRIMP U-Pb zircon dating result of the carbonatites is 1 931±18 Ma. All these threw lights on that the carbonatite are formed by the anatexis of impure marbles from Milan group.

     

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