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    Volume 32 Issue 5
    Sep.  2007
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    Article Navigation >  Earth Science  > 2007  >  32(5): 651-661
    ZHAO Zhen-ming, LI Rong-she, JI Wen-hua, YI Hai-sheng, LIN Jin-hui, ZHU Tong-xing, 2007. The Characteristics of Geochemical and Its Tectonic Significance from the Adakite of Palaeogene Volcanic Rocks in Northern Qiangtang Area, Qinghai-Tibetan Plateau. Earth Science, 32(5): 651-661.
    Citation: ZHAO Zhen-ming, LI Rong-she, JI Wen-hua, YI Hai-sheng, LIN Jin-hui, ZHU Tong-xing, 2007. The Characteristics of Geochemical and Its Tectonic Significance from the Adakite of Palaeogene Volcanic Rocks in Northern Qiangtang Area, Qinghai-Tibetan Plateau. Earth Science, 32(5): 651-661.
    shu

    The Characteristics of Geochemical and Its Tectonic Significance from the Adakite of Palaeogene Volcanic Rocks in Northern Qiangtang Area, Qinghai-Tibetan Plateau

    • 1.

      Xi′an Institute of Geology and Mineral Resources, Xi′an 710054, China

    • 2.

      Chengdu University of Technology, Institute of Sedimentary Geology, Chengdu 610059, China

    • 3.

      Chengdu Institute of Geology and Mineral Resources, Chengdu 610082, China

    • Publish Date: 2007-09-25
      Abstract
    • Studies on the formation times, resources and tectonic environment of the Cenozoic volcanic rocks in the northern Qiantang area, Qinghai-Tibetan Plateau, formed mostly in Plaeogene, show that these rocks have presented characteristics of typical adakite, according to major and trace elements data tested by many dating and geochemical methods. Of the 12 typical adakite samples in important area, SiO2≥56%(59. 05%-67. 80%), Al2O3≥15%(15.43%-16.63%), MgO < 3% (0. 47%-2. 98%, 1 sample is 3.21%), Mg#>20(21.2-56.5), Na2O/K2O>1(1.03-1.76), Sr>400 × 10-6 (609. 6 × 10-6-3 008. 0× 10-6), Y≤18 × 10-6 (4. 53 × 10-6-13.76 × 10-6), Yb≤1. 9 × 10-6 (0.44 × 10-6-1.35 × 10-6), Sr/Y≥ 40(44. 3-314. 68), La/Yb≥20(20. 11-69. 26), δSr positive anomaly(1.02-7.66, 3 samples are 0. 82, 0. 93, 0. 97), δEu positive anomaly or weak anomaly(0. 77-1.36), LREE enrichment, HREE depletion, HFSEs (Nb, Ta, Ti) strong depletion, 87Sr/86Sr>0. 704(0. 707 101-0. 707 923), 143Nd/144Nd < 0. 512 6(0. 512 382-0. 512 448), 40K-40Ar, 40Ar-39Ar ages are 28. 2-32.2 Ma, 38. 1-46. 8 Ma. The above geochemical features of adakite indicate a primitive magmatic generation process responsible for the partial melting of lower thickened crust of northern Qinghai-Tibetan Plateau and perhaps also represent the process in which the remains in lower crust-up mantle melted and erupted in surface after the subduction of ocean crust in the plateau evolvement during early period.

       

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    • 致谢: 本文在成文过程中得到了西安地质矿产研究所李行研究员、洛长义副研究员的悉心指导, 李向民研究员、马中平副研究员给予了一定的帮助, 在此一并表示感谢!此外, 参加本文涉及的10幅区调工作的各类技术人员和后勤人员多达100余人, 他们在极其艰苦的工作环境中付出了大量辛勤的工作, 本文作者向他们所做贡献表示最诚挚的谢意
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