川东“侏罗山式”褶皱带形成时代:不整合面的证据
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The Folding Time of the Eastern Sichuan Juratype Fold Belt: Evidence from Unconformity
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    摘要:

    确定川东“侏罗山式”褶皱带的形成时代是了解上扬子地区这一重要板内变形带动力学机制的关键所在。详细的野外工作显示,该构造带中、上三叠统之间为平行不整合接触关系,说明其没有发生过印支期褶皱。区内上三叠统与下侏罗统,中、下侏罗统和中、上侏罗统之间的平行不整合接触又指示其褶皱变形发生在晚侏罗世之后。区内白垩纪盆地边缘下白垩统与下伏地层呈明显的角度不整合接触,较平缓的上白垩统地层也覆盖在下伏较陡立的不同时代地层之上,从而指示该构造带形成于早白垩世之前。综合分析后限定川东—湘鄂西北部的“侏罗山式”褶皱带的褶皱变形发生在晚侏罗世末至早白垩世初期间,而不是过去认为的印支期或早燕山期。

    Abstract:

    Determination of folding time for the Eastern Sichuan Juratype fold belt is a key for understanding dynamic mechanism of the important Yangtze intraplate deformation belt. Detailed field work demonstrates that the Upper Triassic strata are in disconformable contact with the Middle Triassic strata, which indicates that there was no Indosinian folding in the fold belt. Disconformities between Upper Triassic and Lower Jurassic strata, Lower Jurassic and Middle Jurassic strata, Middle Jurassic and Upper Jurassic strata indicate that the folding took place after the Late Jurassic time. In the margins of the Cretaceous basins, the Lower Cretaceous strata overlap the different preCretaceous strata, and the flat Upper Cretaceous strata overlap steeper, older strata with different ages. These indicate that the folding time predates the Early Cretaceous. Synthetic analysis constrained the folding time of Eastern Sichuan—Northwestern Hunan and Hubei fold belt to the interval between the latest Late Jurassic and the earliest Early Cretaceous, rather than previously proposed Indosinian or Yanshanian folding times.

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胡召齐,朱光,刘国生,张必龙.2009.川东“侏罗山式”褶皱带形成时代:不整合面的证据[J].地质论评,55(1):32-42,[DOI].
.2009. The Folding Time of the Eastern Sichuan Juratype Fold Belt: Evidence from Unconformity[J]. Geological Review,55(1):32-42.

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  • 收稿日期:2008-06-20
  • 最后修改日期:2008-09-17
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