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題 名 | 臺灣東北部板岩帶與片岩帶之斷塊構造=Structural Styles of the Slate and Schist Belts in Northeastern Taiwan |
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作 者 | 林啟文; 楊昭男; | 書刊名 | 經濟部中央地質調查所彙刊 |
卷 期 | 12 1999.06[民88.06] |
頁 次 | 頁39-62 |
分類號 | 353.4 |
關鍵詞 | 臺灣; 東北部; 板岩帶; 片岩帶; 斷塊構造; |
語 文 | 中文(Chinese) |
中文摘要 | 臺灣處於歐亞大陸板塊與菲律賓海板塊之交接帶,地形及地質均顯示其為造山帶 ,其地質構造的演化應與此兩板塊間之運動息息相關。對於此造山帶內之構造地質表現,大 部分的地質學者大多著力於此造山帶的西側 (麓山帶區 ),以及屬於菲律賓海板塊的海岸山 脈地區,而位處造山帶東側片岩區與板岩區的調查目前雖有較多人力投入,但仍顯缺乏。本 研究以臺灣東北部的板岩帶與片岩帶作為研究區域,希望由對這個區域的調查與分析,瞭解 此處造山帶的地質構造型態,進而推演這個地區的構造發展史。由地層與構造特性,作者發 現臺灣東北部的板岩帶與片岩帶的巨觀構造佈局,為以三條斷層所切成的四個斷塊: 分別為 西側的明池斷塊、中央的太平山斷塊、東北側的蘇澳斷塊與柬南側的南澳斷塊。分隔斷塊的 斷層為牛鬥斷層、古魯斷層與猴猗山斷層。對比各個斷塊內所發展出來的小型地質構造的結 果,將本研究區所受的變質變形作用分為七期,第一期 (D �� ) 與第二期 (D �� ) 均只作 用於南澳斷塊內:D �筋陘馫z的發育 (S �� );D �砲]括火成岩的侵入作用,將片岩捉進花 岡岩質的岩漿,及晚期偉晶岩脈與輝綠岩脈的侵入作用。此兩期的作用即為可能是發生在中 生代晚期的南澳運動。第三期 (D �� ) 在各斷塊內產生次生葉理 (S �� ) 與褶皺。D �痊� 明池斷塊內的共軛平滑斷層作用與太平山斷塊內的平滑斷層作用。D �N為古魯斷層、牛鬥斷 層及猴猗山斷層的形成,斷層作用使本地區的岩體次第分開成各個主斷塊,主斷層的活動造 成各主斷塊內的次級斷層, 在斷層作用的局部地區發育出 S �高漲艇芵革z,此時期的斷層 作用均為平滑運動性質。D �艇]括原本為平滑運動的斷層改變為逆滑斷層的時期,以及太平 山斷塊、蘇澳斷塊與南澳斷塊內產生倒轉褶皺。D �f包括明池斷塊內與太平山斷塊內產生小 型正斷層,板岩層局部發育急轉帶。 D �隻� D �f的變質變形作用可能為上新世晚期開始的 蓬萊運動所造成。 |
英文摘要 | It is well-known that Taiwan is situated on the boundary between Asian continentalplate and the Philippine Sea plate, and it is reasonably expected that the geologicalstructure developed should be related to the relative movement between these two plates.Most geologists who decipher the tectonic evolution of Taiwan focus on structural andstratigraphic data in the Coastal Range and Foothill regions. The Schist and Slate Belts,which exposed closet to the plate boundary, i.e., the central part of this island, are scarcelystudied. Based on the structural data collected during long-term field investigation, wefound that the present regional structures of this area have been dissected by faults, andeach fault block bounded by faults has its characteristic style. The purpose of the study isto describe the structural styles developed in some detail and then combine the available stratigraphical data to elucidate the structural relationships of this area. Based on structural analysis and stratigraphy, the Slate Belt and Schist Belt in northeastern Taiwan can be distinguished into four blocks, namely the Minchih Block, the Taipingshan Block, the Suao Block and the Nanao Block. These are bounded by three main faults, namely the Niutou fault, Kulu fault and Hoishan fault. The former two faults are sinistral strike-slip fault, and the latter is a reverse-slip fault. Stratigraphically, the Minchih Block is exposed, in ascending order, the Hsitsun Formation, the Szeleng Sandstone and Kankou Formation. The Taipings han Block is exposed the Nansuao Formation, the Liumaoan Sandstone and the Lushan Formation. The Suao Block is exposed the Nansuao Formation and the Suao Formation. The Nanao Block is exposed the Tungao Schist, the Wutar Schist and the Nanaoling Schist, and three metamorphosed igneous bodies, namely the Fongshushan Amphibolite, the Yuantoushan Gneiss and the Fanpouchienshan Gneiss. Structure correlation among these four blocs reveals seven phases of deformation, i.e.D �� to D �f in the study area. D �� phase is fromation of schistosity (S �� ). D �� phase is an intrusion event, which includes intrusion of granitoids, pegmatite dykes and diabase dykes.Gneissic body captured the folded and schistose amphibolite enclaves are the mostnoteworthy characteristics. These two deformation phases D �� and D �� with in the Nanao Block are related to the Late Mesozoic Nanao Orogeny. D �� phase develops the secondary foliation (S �� ) and folds throughout thestudy area. D �� phase is strike-slip faulting, including formation of conjugatefaults and sinistral fault. D �N phase includes strik e-slip faulting, including Kulufault, Niutou fault, Hoishan Faults, and present state faulted blocks are formedduring this stage. Cleavage (S �� ) is formed locally especially near major faults. D �N phase is reverse-slip faulting in the Suao and Nanao Blocks and overturnedfolding predominates in the Taipingshan, Suao and Nanao Blocks. D �f phase islocally normal faulting in the Minchih and Taipingshan Blocks, and kink folding is diffusely distributed in slate beds. These five deformation phases D �� and D �f within all Blocks are related to the Penlai Orogeny since the Late Pliocene. |
本系統中英文摘要資訊取自各篇刊載內容。