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松潘—甘孜印支地槽西康群复理石建造沉积特征及其大地构造背景
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  • 英文篇名:THE SEDIMENTARY FEATURES OF THE FLYSH FORMATION OF THE XIKANG GROUP IN THE INDOSINIAN SONGPAN—GARZE GEOSYNCLINE AND ITS GEOTECTONIC SETTING
  • 作者:张勤文
  • 英文作者:Zhang Qinwen Institute of Geology, Chinese Academy of Geological Scinece
  • 中文刊名:地质论评
  • 英文刊名:Geological Review
  • 机构:中国地质科学院地质所,
  • 出版日期:1985-05-01
  • 出版单位:地质论评
  • 年:1981
  • 期:05
  • 语种:中文;
  • 页:77
  • 页数:1
  • CN:50-1097/R
  • ISSN:1000-7911
摘要
<正> 川西松潘-甘孜印支地槽形成于三迭纪最早期,结束于三叠纪末。地层单位可分下三迭统和中、上三叠统二部分。主要沉积为一套巨厚陆源碎屑岩系。其下部称菠茨沟组,上部称西康群。在西康群的碎屑岩系中,广泛分布复理石沉积,如小金、道孚雅江和理县等地。本文主要对上述地区复理石沉积进行岩石和构造分析。
        Terrigenous flysch formations are developed in many places in Songpan-Garze
    geosyncline, western Sichuan. On the basis of the results gained through work in
    the Xiaojin area, the flysch rhythem may be divided into three units: (Ⅰ) arena-
    ceous, (Ⅱ)silty, and(Ⅲ) pelitic. Each unit may be subdivided into rhythemic layers;
     thus seven small rhythemic layers are distinguished, i. e. Ⅰa, Ⅰb, Ⅰc; Ⅱa, Ⅱb; Ⅲa and Ⅲb.
    These divisions are more practical than the fivefold divisions (i. e. A, B, C, D and
    E divisions) of the Bouma sequence, so can best reveal genetic features.
     These small rhythemic layers were formed in different environments. In addition
    to the turbidity-current processes, there might be the effect of marine currents. The
    pelitic portion might be transported and deposited in the colloidal state.
     the Songpan-Garze geosyncline was formed on the basis of the disintegration
    of continental crust in the late Permian. Therefore, the great majority of the flysch
    series was deposited on the substrate of oceanic crust. At that time, many huge
    deltas came into being at the northern margin of the oceanic basin, and afterwards
    the thrbidity currents formed by slumping transported clastic materials to the
    central part of the basin. In the ancient oceanic basin were distributed some ancient
    island-arcs, which controlled sedimentation and eruption.
引文

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