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Development of tectonostratigraphy in distal part of foreland basin in southwestern Taiwan

机译：台湾西南部前陆盆地远端构造地层学发展

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摘要

In the young and active tectonic belt of southwestern Taiwan, reconstructed stratigraphy in the distal part of the foreland basin reveals at least two regional unconformities with the younger ones covering the areas farther from the mountain belt. In contrast with the previously proposed monotonous basin development, the temporal-spatial distribution of the unconformities indicates the back-and-forth migration of the foreland basin margin. Three distinct episodes of rapid subsidence during the foreland basin development have also been identified. The onset of the basin development can be well constrained by the initial rapid subsidence at 4.4-4.2 Ma, which happened only in the proximal part of the basin. This was followed by two younger episodes of rapid subsidence events at 2-1.8 Ma and 0.45 Ma, which were encountered initially in the areas progressively farther from the orogenic belt. We propose a model of episodic tectonic evolution in the distal part of the foreland basin in southwestern Taiwan. During each episode of rapid subsidence, uplifting that corresponds to the forebulge began with a concurrent rapid subsidence in the areas closer to the basin center and was followed by rapid subsidence and deposition of widespread strata onlapping toward the basin margin. Part of the widespread strata and its overlying deposits would be eroded in the beginning of the next episode when the forebulge shifted toward the orogenic belt. In general, rate of forebulge migrating away from the orogenic belt during the early stage was slower than that derived from a previously proposed kinematic model of a steady migration of the orogenic belt. This might be due to a rifted and weaker lithosphere beneath the foreland basin. Once the foreland basin migrated onto the less stretched lithosphere, the basin would expand rapidly into the craton.
机译：在台湾西南部活跃的年轻构造带中，前陆盆地远端的地层重建显示至少两个区域不整合面，而年轻则覆盖了远离山区的地区。与先前提出的单调盆地发展相反，不整合面的时空分布表明前陆盆地边缘的来回迁移。还确定了前陆盆地发展过程中快速沉降的三个不同时期。盆地发育的开始可以通过仅在盆地近端发生的4.4-4.2 Ma的初始快速沉降来很好地加以约束。随后发生了两次年轻的快速沉降事件，分别为2-1.8 Ma和0.45 Ma，最初在距造山带越来越远的地区遇到。我们提出了台湾西南部前陆盆地远端的情节构造演化模型。在每次快速沉降过程中，对应于隆隆的隆起开始于同时发生在盆地中心附近区域的快速沉降，然后是快速沉降和向盆地边缘重叠的广泛地层沉积。当前隆向造山带转移时，在下一个事件开始时，广泛分布的地层的一部分及其上覆的沉积物将被侵蚀。通常，前隆从早期从造山带迁移的速度要慢于先前提出的造山带稳定迁移的运动学模型。这可能是由于前陆盆地下方的裂谷和较弱的岩石圈造成的。一旦前陆盆地迁移到伸展程度较小的岩石圈，该盆地就会迅速扩张到克拉通。

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  • 来源
    《Journal of Asian earth sciences》 |2014年第1期|98-115|共18页
  • 作者

    Kenn-Ming Yang; Jong-Chang Wu; E.-Wen Cheng; Yi-Ru Chen; Wei-Cheng Huang; Chin-Chun Tsai; Jar-Ben Wang; Hsin-Hsiu Ting;

  • 作者单位

    Department of Earth Sciences, National Cheng Kung University, 1 University Road, Tainan 70101, Taiwan;

    Exploration and Production Business Division, CPC Corporation, Taiwan, Miaoli, Taiwan;

    Department of Earth Sciences, National Cheng Kung University, Tainan, Taiwan;

    Exploration and Development Research Institute, CPC Corporation, Taiwan, Miaoli, Taiwan;

    Exploration and Production Business Division, CPC Corporation, Taiwan, Miaoli, Taiwan;

    Exploration and Development Research Institute, CPC Corporation, Taiwan, Miaoli, Taiwan;

    Exploration and Development Research Institute, CPC Corporation, Taiwan, Miaoli, Taiwan;

    Exploration and Development Research Institute, CPC Corporation, Taiwan, Miaoli, Taiwan;

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  • 正文语种 eng
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  • 关键词

    Basin analysis; Tectonostratigraphy; Foreland basin; Southwestern Taiwan;

    机译：盆地分析;构造地层学;前陆盆地;台湾西南部;

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