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頁籤選單縮合
題名 | Structural Lithic Units in the Western Foothills, Taiwan: A Case Study in the Miaoli-Wenshui and the Chiayi-Alishan Areas=臺灣西部麓山帶之構造岩性單位研究:以苗栗-汶水地區及嘉義-阿里山地區為例 |
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作者 | 林慶偉; 魏聲錕; 劉景仁; | 書刊名 | 中國地質學會會刊 |
卷期 | 39:2 1996.04[民85.04] |
頁次 | 頁167-188 |
分類號 | 356.232 |
關鍵詞 | 構造岩性單位; 地質構造; 褶皺; 逆斷層; 破裂面; Structural lithic unit; Geological structure; Fold; Thrust; Fracture; |
語文 | 英文(English) |
中文摘要 | 區域地質圖顯示位於苗栗—汶水地區及嘉義—阿里山地區西部麓山帶之地質構造 特性並不一致。於苗栗—汶水地區斷層構造較為發達,嘉義—阿里山地區褶皺構造則較為 多見。經此二區域構造岩性單位的研究得知造成此二區域地質構造之差異,主要是受到不 同構造岩性單位分佈範圍之不同所致。 由區域地質圖與野外所觀察之中視構造現象得知,西部麓山帶位於苗栗—汶水地區及嘉 義—阿里山地區所出露之沉積岩層可分為三個構造岩性單位。單位A主要為砂頁岩互層組 成,短波長之尖頂褶皺為常見之地質構造。單位B為厚層至塊狀砂岩夾薄至厚層的頁岩, 逆斷層及其伴生之褶皺為主要之地質構造。單位C為厚層至塊狀之疏鬆砂岩與頁岩所組 成,長波長之同心圓褶皺是主要之地質構造。苗栗—汶水地區之單位A包括下部中新世之 地層,單位B包括上部中新世之地層,單位C則包括上新世至更新世之地層。嘉義—阿里山 地區之單位A包括出露之南港層與下部南莊層,單位B包括上部南莊層及其以上之中新世地 層,單位C包括上新世與更新世之地層。 苗栗—汶水地區麓山帶之沉積岩層中,較多之出露岩層屬於構造岩性單位B,因此該區有 較多之逆斷層及其伴生之褶皺發育。相較之下,嘉義—阿里山地區則有較多屬於構造岩性 單位A之岩層初露,因此有較多之小規模尖頂褶皺之發育。 |
英文摘要 | Suites of stratigraphic units which act together as relatively strong and weak horizons within the Western Foothills fold and thrust belt can be recognized in the Miaoli-Wenshui and Chiayi-Alishan areas. Through combining field observations, theoretical considerations and laboratory tests, it has been determined that the influence of the strength of individual units to the development of geological structures is less important than the relative strength of a package of suites that deformed coherently. This result is consistent with the concept of structural lithic unit which has been successfully applied to understand the structural style in different tectonic regimes. The difference in the structural style of the Western Foothills fold and thrust belt between the Miaoli-Wenshui and the Chiayi-Alishan areas are observed through published geological maps. More thrusts and thrust-related folds are seen in the Miaoli-Wenshui area but more buckling folds are observed in the Chiayi-Alishan area at the same scale. In comparison with the distributions of structural lithic units in these two areas, the difference in the structural style seemingly can be attributed to the variation in the distribution of structural lithic units within these two areas. Three structural lithic units which progress from older to younger and are temporarily named A, B, and C are identified in the Western Foothills on both the Miaoli-Wenshui and Chiayi-Alishan areas according to the published geological maps and field observation of mesoscopic structures. Structural lithic unit A is primarily composed of interbedded, well-cemented sandstones and shales. Small scaled chevron folds with wavelengths of tens of meters to hundreds of meters is the most conspicuous deformed feature in this unit. Unit B mainly consists of thick-bedded to massive well cemented sandstones with thin-to thick-bedded shale. Thrusts and thrust-related asymmetric folds are the dominant structures in unit B. Unit C mainly consists of thick-bedded to massive, poorly cemented sandstones, siltstones, conglomerates, and shales. Concentric folds with wavelengths over hundreds of meters is the major structure in unit C. In the Miaoli-Wenshui area, the Lower Miocene strata belongs to unit A, the Upper Miocene strata belongs to unit B, and the Plio-Pleistocene strata belongs to unit C. In the Chiayi-Alishan area, the exposed Middle Miocene Nankang Formation and the Lower part of the Upper Miocene Nanchuang Formation belong to unit A, the Upper part of the Nanchuang Formation and the Lower Mio-Pliocene Kueichulin Formation belong to unit B, and the Plio-Pleistocene strata belongs to unit C. Since there are more rocks of structural lithic unit B exposed in the Miaoli-Wenshui area, than in the Chiayi-Alishan area, more thrusts and thrust-related folds are observed. In contrast, more rocks of structural lithic unit A are exposed in the Chiayi-Alishan area and small scaled buckling folds become dominant deformed structures. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。