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    National Tsing Hua University Institutional Repository > 歷任校長 > 沈君山 (1994-1997) > 期刊論文 >  Geochemical and Sr-Nd Isotopic Characteristics of Granitic Rocks from Northern Vietnam


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/80870


    Title: Geochemical and Sr-Nd Isotopic Characteristics of Granitic Rocks from Northern Vietnam
    Authors: C.Y. Lan;S.L. Chung;C.H. Chen;J.J. Shen;C.H. Lo;P.L. Wang;T.T. Hoa;H.H. Thanh;S.A. Mertzman
    教師: 沈君山
    Date: 2000
    Publisher: Elsevier
    Relation: JOURNAL OF ASIAN EARTH SCIENCES, Elsevier, Volume 18, Issue 3, JUN 2000, Pages 267-280
    Keywords: RIVER SHEAR ZONE
    SOUTH CHINA
    SOUTHEASTERN CHINA
    TECTONIC EVOLUTION
    INDO-CHINA
    ASIA
    DISCRIMINATION
    CONSTRAINTS
    EXTRUSION
    BOUNDARY
    Abstract: Five major felsic igneous suites from northern Vietnam, with ages from mid-Proterozoic to early Cenozoic, were studied. Representative granitic rocks from the Posen Complex (mid-Proterozoic) and the Dienbien Complex (late Permian to early Triassic) show geochemical characteristics similar to those of calc-alkaline to high-K calc-alkaline I-type granites. However, the former, located in the South China block, has significantly higher initial Nd isotopic ratios [epsilon(Nd)(T) = + 0.7 to + 1.5] and older Nd isotopic model ages (T-DM similar to 1.7 Ga) than the latter [epsilon(Nd)(T) = -4.7 to -9.7; T-DM similar to 1.3-1.5 Ga] which were emplaced south of the Song Ma Suture and thus in the Indochina block. The generation of both complexes may be attributed to subduction-related processes that occurred in two distinct crustal provenances with different degrees of mantle inputs. On the other hand, Jurassic to Cretaceous granitic rocks from the Phusaphin Complex, contemporaneous rhyolites from the Tule Basin, and late Paleogene granitic rocks from the Yeyensun Complex, all exposed in the South China block between the Ailao Shan-Red River shear zone and the Song Ma Suture, display geochemical features similar to those of A-type granites with intermediate epsilon(Nd)(T) values (+ 0.6 to -2.8) and younger T-DM ages (0.6-1.1 Ga). These magmas are suggested to have been generated as a consequence of intraplate extension id the western part of the South China block (Yunnan), and to have been transported to their present position by mid-Tertiary continental extrusion along the Ailao Shan-Red River shear zone related to the India-Asia collision. Overall, the isotopic and model age data, reported in this study indicate that in northern Vietnam, the most important crust formation episode took place in the Proterozoic. Likewise, repeated mantle inputs have played a role in the petrogenesis of Phanerozoic granitic rocks.
    Relation Link: http://www.elsevier.com/wps/find/homepage.cws_home
    URI: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/80870
    Appears in Collections:[沈君山 (1994-1997)] 期刊論文
    [物理系] 期刊論文

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