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題 名 | Litho-Stratigraphy and Structural Geology of the Wanjung Area, Eastern Taiwan and Their Tectonic Implications=臺灣東部萬榮地區的岩石地層和構造地質與其在大地構造的涵意 |
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作 者 | 林楳嶺; | 書刊名 | 中國地質學會會刊 |
卷 期 | 42:2 1999.05[民88.05] |
頁 次 | 頁247-267 |
分類號 | 356.232 |
關鍵詞 | 岩石地層學; 構造地質學; 玉里帶; 大南澳片岩; Litho-stratigraphy; Structural geology; Yuli belt; Tananao Schist; |
語 文 | 英文(English) |
中文摘要 | 出露於臺灣東部花蓮萬榮地區的岩石有蛇紋岩、斑點泥質片岩、石英-雲母片岩、 雲母片岩和綠色片岩,屬大南澳片岩玉里帶。經詳細之野外調查、地質作圖與構造分析,本 區岩層與地質構造的分佈已十分清楚。本區只有一個岩石地層單位玉里層。為了製作地質圖, 廣義的玉里層在此由下而上可分為馬太鞍、森榮、長漢山和萬榮等段。馬太鞍段係由石英- 雲母片岩與雲母片岩的互層所組成;森榮段主要由斑點泥質片岩所構成,為野外地質調查之 良好指準層,其呈向西漸漸變薄而似尖滅的舌狀岩層;而長漢山段主要由厚層之石英-雲母片 岩夾薄層綠色片岩所組成。萬榮段主要由變質之蛇綠岩系的岩石所組成,它的分布僅在萬榮 構造地塊(由萬榮逆斷層所限制),且其是一個飛來層覆蓋在原地玉里層其它段之上。原地玉 里層記錄了本區三期的變形作用,各期變形作用所產生的劈理均屬褶皺軸面劈理。第一期的 褶皺軸面走向為東北,向西北傾斜50°;第二期的褶皺軸面走向為東西向,傾角近乎鉛直; 而第三期為東北,向西北緩傾20°。整體而言,萬榮地區岩層的褶皺包絡面,呈現一個單斜 構造,其位態約略為東西走向,向北緩傾斜。全區岩層原有之沈積構造大多已遭多次變形作 用破壞殆盡。區域岩層之配置主要係受第一期變形作用之影響,而隨後發生的變形作用只是 略為修飾一下而已。本區構造事件發生的次序由先而後依次為第一期區域變形/變質作用、第 二期區域變形/變質作用、第三期區域變形/變質作用、北長漢山正斷層作用和萬榮逆斷層作 用。 根據以上之基本資料,一些玉里帶大地構造上之重要涵意歸納如下: (1)本區第一期區域變形/變質作用之伸向為東南,可視為晚中生代南澳運動時庫拉板塊 以西北向隱沒於歐亞大陸板塊之結果;第二期區域變形/變質作用應是太平運動或早期蓬萊運 動的退化變質作用;第三期區域變形/變質作用、北長漢山正斷層作用和萬榮逆斷層作用應可 視為蓬萊運動弧陸碰撞的產物。 (2)約在0.65~0.37Ma,萬榮段沿著萬榮逆斷層向西搬運至現址。 (3)基於斑點泥質片岩之礦物群和構造特徵的一致性,萬榮地區原地玉里層的馬太鞍段、 森榮段和長漢山段可分別對比於瑞穗地區的紅葉段、瑞穗段和虎頭山段。 |
英文摘要 | The rock sequence exposed in the Wanjung area, eastern Taiwan, belonging to the Yuli belt of the Tananao Schist, is mainly composed of serpentinite, spotted pelitic schist, quartz-mica schist, mica schist and greenschist. The present field investigation, geologic mapping and structural analysis have revealed that the only one litho-stratigraphic unit, the Yuli Formation, can be subdivided into the Mataian, Shenjung, Chenjung, Changhanshan and Wanjung Members in ascending order. The former three Members are considered here as the autochthonous (in-situ) Yuli Formation, while the last one as allochthonous. The Mataian Member is constituted by alternation of quartz-mica schist and mica schist. The Shenjung Member is mainly composed of spotted pelitic schist, a good key bed in the field. This Member seems to occur as a tongue-like strata and pinches out to the west. The Changhanshan Member is composed of a thick quartz-mica schist with greenschist. The Wanjung Member mainly composed of metamorphosed ophilolitic rocks and bounded by the Wanjung thrust, occurs as a klippe overlying the other Members. Three sets of axial-plane cleavage (S□, S□ and S□) were developed during three stages of deformation. S□ strikes northeast and dips about 50° to the northwest. S□ strikes east-west and dips nearly vertical. S □, however, strikes northeast and dips about 20° toward the northwest. On the whole, the enveloping surface of folds of the strata striking roughly east-west and dipping gently towards the north, shows a simple homoclinal structure. The original depositional structures of the rocks were largely obliterated after the multiple deformation. The general disposition of the rocks was largely preserved from the very beginning of the multiple deformations and then slightly modified in the later deformations. Faults identified in the area are named as the Peichanghanshan normal fault and the Wanjung thrust. Structural events in the study area, from early to late, are the three-stage regional deformation/metamorphism, followed by the Peichanghanshan normal faulting and the Wanjung thrusting. Based on the data mentioned above, some important geotectonic implications of the Yuli belt have been summarized as follows: (1) The southeastward vergence of the cleavage formed by the first-stage regional deformation/metamorphism may be considered as resulted from the subduction of the Kula plate toward the northwest under the Eurasia continent in the late Mesozoic Nanao orogeny. The second-stage deformation occurred in the Taiping or in the early Penglai orogeny, which has been accompanied by a retro-grade metamorphism. The third-stage regional deformation represented by the Peichanghanshan normal faulting and the Wanjung thrusting is evidently products of the late Penglai orogeny. (2) Probably during 0.65~0.37Ma, the Wanjung Member was transported westward to the current site along the Wanjung thrust. (3) The Mataian, Shenjung and Changhanshan Members in the present area can be correlated respectively to the Hongyeh, Juisui and Hutoushan Members in the Juisui area, based on the marker bed of the spotted pelitic schist. |
本系統中英文摘要資訊取自各篇刊載內容。