2009-01-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/670626摘要：在板塊邊緣帶裡，板塊之間的聚合應力在時間與空間上的分布是大地構造中最基礎的課題之一。為獲取更多資訊以解答這個問題，我計畫針對兩個重要但十分不同的板塊邊緣帶，研究其活動構造及其構造意義。這兩個板塊邊緣帶一為位於智利北部的安地斯山中西部，一為台灣活動造山帶。地形與構造分析將是本計畫的主要基礎。以安地斯山為例，對其活動變形的了解有助於進一步認識板塊聚合應力在此造山帶中部的分布，以及智利隱沒帶的長期構造特性。而這也有助於了解此造山帶未來可能發生的大地震。 本計畫包含兩個部分：在安地斯山方面，計畫中的工作將針對智利北部的Preandean Depression帶周邊的幾個重點區域進行深入研究。這些區域在初步分析中顯示具有可能十分重要的活動構造，並且具有定年材料，可用來決定這些構造的活動年代。在台灣方面，計畫中的工作將延續之前的研究，針對台灣東部的活動構造特性進行分析。安地斯山中西部主要構造的活動時間將有助於了解該地區的構造演化，以及該地區長期與短期變形的差異。這些資料或許可以證實一個假設，亦即有相當程度的板塊聚合量被安地斯山造山帶中部主要的陸上構造所消化，而非完全消化於板塊隱沒帶中。這些結果將與台灣造山帶的資料比較，以進一步了解板塊邊緣帶的活動變形與應力分布，以及這兩種不同的板塊邊緣帶的差異。<br> Abstract: One of the fundamental questions in tectonics is how plate convergence is distributed spatially and temporally across plate boundaries. In order to gather more information toward answering this question, I propose to study active structures and their tectonic implications across two major but very different plate boundaries: the western central Andes, northern Chile, and the active suture of Taiwan. The proposed project would be based upon geomorphic and structural investigations. For the Andean belt, knowledge of the active deformations in northern Chile is crucial to better understand the current distribution of convergence across the central Andean orogenic belt and the long-term tectonic and structural characteristics of the Chilean subduction zone. This will lead to a better understanding of the nature of future large earthquakes along this belt. The project consists of two parts: For the Andean belt, proposed work would focus on several target areas surrounding the Preandean Depression, northern Chile, where, based upon preliminary mapping and a pilot field trip, potentially important active structures and dating materials to constrain their ages are present. For Taiwan, the proposed work would be the continuation of my previous investigations, which focus on the characterization of active structures in eastern Taiwan. By determining the timing of activity of major structures in western central Andes, I hope to quantitatively understand the tectonic evolution of the area, and address questions about the differences between short-term and long-term measurements of deformation. A specific hypothesis to test is whether major onland structures are currently absorbing a substantial amount of plate convergence across the central Andean belt. Such results will then be compared with the information obtained across the Taiwan orogen. This will lead to further understanding of active deformation and strain accumulation across plate boundaries, and the differences between these two very different types of plate boundaries.板塊邊緣安地斯山新構造運動台灣plate boundariesAndesneotectonicsTaiwan