台灣海峽位處歐亞板塊上，分別經歷古近紀和新近紀的構造活動形成一系列的張裂盆地。本研究區域為台灣海峽西南部受古近紀張裂作用形成的澎湖盆地。至今前人研究對該盆地斷層的發育、地層架構與次盆地之間演化的關聯性仍未有完整的解釋。因此，本研究目的在探討澎湖盆地演化模式，建立次盆地之間構造連接及演化順序，並釐清澎湖盆地內部斷層發育時序。本研究針對澎湖盆地從事井下地質對比、震測分析、構造形貌解釋和構造地層分析來建立澎湖盆地演化模型。
震測解釋結果顯示，澎湖盆地為一典型半地塹盆地，其中，部分地區可發現受到斷層延展作用所產生的向斜褶皺形貌，然而褶皺形貌由深部到淺部寬廣度逐漸增加，有別於前人提出的模型。本研究利用構造模擬，提出生長斷層延展褶皺之三角剪切模型以解釋發育於此區域的向斜褶皺構造。
本研究結果顯示，澎湖盆地中的三個次盆地在張裂初期分別受到三條獨立的正斷層生長作用控制而發育，隨著張裂作用持續，三條正斷層側向延展，並彼此交互影響，最終三條斷層完全連接，形成澎湖盆地的邊界正斷層，三個次盆地始連接在一起。

A series of NE-SW trending Paleogene rift basins had developed on the southeastern Eurasian Plate. Each basin had separately undergone active extension in the Paleogene. The Penghu basin is one of the Paleogene rift basins in western Taiwan Strait and composed of three NE-SW trending sub-basins. The main purpose of this study is to investigate the evolution of the Penghu basin and the modes of compartmentalization of the sub-basins and their developing sequence. This study also proposes the kinematics of syn-rift structural settings.
The major boundary normal faults of the Penghu basin strike NE-SW but turn into E-W to the south. The intra-basin normal faults can be grouped into two orientations, NE-SW and E-W. The E-W striking normal faults separate the Penghu basin into three sub-basins, northeastern, central and southwestern sub-basins respectively. The width of the Penghu basin becomes narrower toward the northeast. The D-L profiles demonstrating the lateral variation in throw of the normal fault indicate that the major boundary normal fault comprised three individual segments in the early rift stage. Fault segments were breached in the late rift stage and fault displacement was mainly active in the southern segment. For the intra-basin faults, E-W striking normal faults had already existed since pre-rift stage. Paleogene rifting developed NW-SE striking faults and was accompanied by reactivation of E-W striking faults. In the final, extensional ratio was largest in the southwestern sub-basin and decreased through the central one and toward the northeastern one.
In summary, the Penghu basin had been compartmentalized into three sub-basins. In the initial rift stage, the sub-basins in the central and southwestern basin formed and the northeastern basin developed later. During the rift stage, three boundary faults propagated laterally and coalesced, resulting in the combined sub-basins and forming the final basin architecture of the Penghu Basin.

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