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Cross section balancing across the Taiwan fold-and-thrust belt for improving palaeogeographic reconstructions of the Eurasian passive margin

台湾褶皱逆冲带的剖面平衡改善欧亚被动边缘的古地理重建

基本信息

批准号：
380155214
负责人：
Professor Dr. Nikolaus Froitzheim
金额：
--
依托单位：
Arbeitsgruppe Strukturgeologie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2017
资助国家：
德国
起止时间：
2016-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/380155214?language=en
关键词：
Cross section balancing across Taiwan

项目摘要

We intend to better constrain the amount of overall shortening in the Taiwan fold-and-thrust belt by constructing new balanced cross sections along three transects across the island. This requires collecting more detailed information on the lithologies, the orientation of foliations and kinematics of fault zones encountered along the transects, particularly where pre-Cenozoic basement is exposed. For one thing, we aim at verifying our current working hypothesis, according to which the pre-Cenozoic basement exposed in the so-called Tailuko and Yuli belts is built up of two crustal-scale imbricates that were juxtaposed along a W-vergent thrust contact soon after collision. Secondly, we intend to verify whether, following nappe stacking, these two tectonic units became involved in crustal-scale back-folding, leading to the development of a second, vertical to steeply W-dipping younger cleavage that overprinted older nappe-stacking related foliations. Our improved understanding of the basement units in Taiwans Central Range will thus provide the base for new balanced cross section constructions, which, in turn, will allow us to make new palaeogeographic restorations of the Eurasian passive margin prior to arc-continent collision, relying on quantitative estimates of thrust belt shortening.

为了更好地限制台湾褶皱冲断带的整体缩短量，我们打算沿台湾岛的沿着三条断面构造新的平衡断面。这就需要收集关于岩性、面理方向和断层带运动学的更详细的资料，特别是在前新生代基底暴露的地方，这些断层带沿着断面。一方面，我们的目的是验证我们目前的工作假设，根据该假设，在所谓的台鲁克和玉里带暴露的前新生代基底是由两个地壳规模的叠瓦，并在碰撞后不久沿着W-逆冲接触并列。其次，我们打算验证是否，推覆体堆叠后，这两个构造单元成为参与地壳规模的背褶，导致发展的第二个，垂直急剧W倾斜年轻的卵裂，叠印老推覆体堆叠相关的叶理。因此，我们对台湾中央山脉基底单元的进一步了解将为新的平衡剖面的构建提供基础，这反过来又将使我们能够在弧-陆碰撞之前对欧亚被动边缘进行新的古地理解释，依赖于冲断带缩短的定量估计。