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題 名 | Influence of the Peikang Basement High on the Structural Development of Western Foothills and Coastal Plain in South-Central Taiwan:A Sandbox Approach=北港基盤高區對臺灣西南地區西部麓山帶之地質構造發育的影響:砂盒物理模型研究 |
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作 者 | 林慶偉; 黃敏郎; | 書刊名 | 臺灣石油地質 |
卷 期 | 32 1998.12[民87.12] |
頁 次 | 頁105-122 |
分類號 | 356.232 |
關鍵詞 | 北港基盤高區; 臺灣; 西南地區西部麓山帶; 地質構造發育; 砂盒物理模型; |
語 文 | 英文(English) |
中文摘要 | 本研究以砂盒物理模型研究在擠壓應力作用下,基盤高區對其上及附近的沈積岩體之變形的影響。乾燥之石英砂用以模擬沈積岩體,木板則用以代表基盤。砂體的厚度與基盤的坡降則為模型研究的兩個主要變數。 研究結果顯示,砂體之厚度是控制俯視下構造發育特性的主要因子,基盤的坡降則主要影響到橫剖面之地質構造發有的特性。所有的模型中均顯示逆斷層是主要發育的地質構造,而未見走向滑移斷層的發有。逆斷層依其間距可分為二群,一群靠近推擠板位置,其間距較小,另一群則遠離推擠板,其間距較大。俯視下,厚砂層的模型其逆斷層之間距較大,變形前緣及開始受高區影響的位置較遠離推擠板。橫剖面上當基盤坡降為30度時,逆斷層之傾角最大。而所有的模型均顯示,當受高區影響後,單一的逆斷層在接近高區處有較小之傾角,遠離高區處情角則變大。 模型研究結果與臺灣中南部地區之地質構造比較,顯示西部麓山帶之逆斷層呈S狀之軌跡深受北港高區之影響,而發有於本區之走向滑移斷層亦深受高區存在的影響。在彰化臺中地區出現之西北.東南走向之走向滑移斷層可能即為逆衝之岩塊遇到北港高區時,因為位移量不諧調所造成者。而在臺灣申南部另常見到呈共輒分佈之西北-東南及東北東-西南西或東-西走向之走向滑移斷層,當為反應純剪應變之安得生型態的走向滑移斷層。 |
英文摘要 | Sandbox models are used to evaluate the influence of a basement high on the deformation responses of the overlying sedimentary rocks during compression. Dry quartz sand is used to simulate the sedimentary cover and a wooden plate of a semi-elliptical shape represents the basement high in models. The slope of the basement high and the thickness of the sedimentary cover are two main variables in the models. Two kinds of layer thickness, 1.5 cm and 2.5 cm, and the basement highs with 5°, 30°, and 90° slopes are used in this model study. Only thrusts are observed in all models. Thrusts can be divided into two groups according to their spacing. The thrusts of group I with a relative small spacing develop in the area close to the pushing end. The thrusts of group 2 with a larger spacing develop in the area outside of group I. The characteristics of the thrusts on a map view are strongly influenced by thickness of the sedimentary cover. Spacing of the thrusts increases with the thickness of the cover. The distances from the pushing end to the deformation front and threshold above the basement high increase proportionally with the thickness of the cover as well. In cross sections, the attitude of the thrusts is highly affected by the slope of the basement high. Thrusts have a greater dip angle in models with a 30° basement slope. Without regard to the basement slope, dip of the thrusts is significantly less in the area close to the basement high than that in the area distant from it. By comparing the modeling results with the actual geological structures, the s-shape structural traces in the Western Foothills of south-central Taiwan can be attributed to the existence of the Peikang Basement High. However, the development of the NW-trending strikeslip faults in the Taichung-Changhua area is probably due to the displacement incompatibility in the thrust sheet where the thrust sheet meets the Peikang Basement High. Furthermore, conjugate strikeslip faults in south central Taiwan are interpreted as the Anderson-type strikeslip faults, representing a pure shear strain condition. |
本系統中英文摘要資訊取自各篇刊載內容。