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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 constraints from the Kontum massif, central Vietnam on the crustal evolution of the Indochina block

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/80874

    Title: Geochemical and Sr-Nd isotopic constraints from the Kontum massif, central Vietnam on the crustal evolution of the Indochina block
    Authors: C.Y. Lan;S.L. Chung;T.V. Long;C.H. Lo;T.Y. Lee;S.A. Mertzman;J.J. Shen
    教師: 沈君山
    Date: 2003
    Publisher: Elsevier
    Relation: PRECAMBRIAN RESEARCH, Elsevier, Volume 122, Issue 1-4, Special Issue SI, Article Number PII S0301-9268(02)00205-X, APR 10 2003, Pages 7-27
    Keywords: Kontum massif
    Sr–Nd isotope
    Indochina block
    Abstract: The Kontum massif, central Vietnam, consists mainly of high-grade (amphibolite to granulite facies) metamorphic rocks and represents the largest basement exposure (core complex) of the Indochina block. To explore the crustal evolution of Indochina, Sr and Nd isotopic and geochemical data for various rock types from the massif are reported. The basement rocks show a wide range of present day epsilon(Nd) values from -22 (gneiss) to +15 (amphibolite), yielding depleted-mantle model ages (T-Dm) from 1.2 to 2.4 Ga along with an "exceptionally" old T-Dm of 2.7 Ga for a granulite. These data indicate that crustal formation in the Indochina block took place principally during the Paleoproterozoic and Mesoproterozoic, and do not support the conventional notion that the Kontum core complex is composed of Archean rocks. Geochemical data indicate that the gneisses and schists have heterogeneous compositions characterized by a calc-alkaline nature, whereas most of the amphibolites are tholeiitic basalts with intraplate magmatic signatures. Therefore, the former may be interpreted as products from pre-existing Proterozoic crustal materials and the latter as resulting from the Paleozoic rifting event that disintegrated the Indochina block from Gondwanaland. During its accretion with other SE Asian continental blocks in Permo-Triassic time, the Indochina core complex was subjected to the Indosinian orogeny, characterized by a high-temperature, granulite facies metamorphism in the lower crust with associated charnockite magmatism and subsequent regional exhumation.
    Relation Link: http://www.elsevier.com/wps/find/homepage.cws_home
    URI: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/80874
    Appears in Collections:[沈君山 (1994-1997)] 期刊論文
    [物理系] 期刊論文

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