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| 題 名 | Tectonic Aspects of the Paleogene Depositional Basin of Northern Taiwan=臺灣北部古第三紀沉積盆地的地體構造背景 |
|---|---|
| 作 者 | 鄧屬予; | 書刊名 | 中國地質學會會刊 |
| 卷 期 | 34:4 1991.10[民80.10] |
| 頁 次 | 頁313-336 |
| 分類號 | 353.17 |
| 關鍵詞 | 北部; 古第三紀; 地體構造; 沉積盆地; 臺灣; |
| 語 文 | 英文(English) |
| 中文摘要 | 臺灣北部古第三紀地層原本是中國大陸邊緣的堆積物，其岩相在東北--西南方向大致相當，但在西北--東南方向變化甚大。在臺灣海峽中，中新統直接覆蓋白堊系，古第三系完全缺失。在西部麓山帶及雪山山脈中，古第三系出露，並逐漸向東變厚，沉積環境變深，在雪山山脈東緣厚達4000公尺以上。但到了脊樑山脈中，古第三系又突然消失，而由中新統不整合覆蓋在中生界的基礎上。由地層分布及岩相變化判斷，臺灣北部古第三系的沉積盆地很可能為一半地塹槽（定名為雪山槽）。其西緣為觀音隆起，東緣以梨山構造線與脊樑山脈隆起為界。盆地大約在始新世中期開始沿梨山構造線下陷成形，在漸新世晚期後逐漸被沉積物填滿。這個半地塹槽和現今臺灣海峽中許多古第三紀的半地塹相當。其形成機制和中國大陸邊緣的張裂性活動息息相關。 |
| 英文摘要 | In order to better understand the role of Tertiary sedimentation of Taiwan in the context of the southeastern China continental margin, the Paleogene and Lower Miocene strata of northern Taiwan and the neighboring Taiwan Strait were investigated. In the Taiwan Strait, the Paleogene sequences pinch out toward a basement high (Kuanyin Uplift) where the Lower Miocene sequences unconformably overlie the Cretaceous strata. In the Western Foothills and Husehshan Range of Taiwan, thick sequences ranging from Eocene to Middle Miocene crop out. In the Backbone Range, the Paleogene rocks are either absent or very thin, and the Lower Miocene sequences may unconformably overlie the Mesozoic basement. Based on integrated stratigraphic information, it is found that Miocene sequences form sheet-like layers draping the entire study area, whereas Paleogene sequences form a sedimentary wedge confined to the area between the Kuanyin Uplift and the Backbone Range. The Miocene sequences show mild lateral facies variations and mutually consistent vertical facies changes that match with global sea level fluctuations. The Paleogene sequences exhibit strong lateral facies variations and erratic sequential facies changes that essentially contradict the global sea level curve. The difference in distribution and facies pattern between the Miocene and Paleogene sequences clearly demonstrates that the Paleogene basin was a half-graben trough sloping from the Kuanyin Uplift and bordered by an offshore basement high represented by the Backbone Range. This half-graben trough, termed the Hsuehshan trough, was one of the Paleogene troughs in the China continental shelf. The trough was probably initiated in the Late Eocene and then subjected to a major subsidence in the Early Oligocene, in association with a major rifting event that led to the opening of the South China Sea. The trough was filled up by terrigenous sediments derived from the China continent in the Early Miocene and was buried by sheet-like Miocene deposits that transgressed the continental margin. Eustatic fluctuations manipulated the transgressive-regressive cycles of the Miocene sediments that accumulated upon the subsiding continental margin until it was deformed by the late Neogene collisional orogeny. |
本系統中英文摘要資訊取自各篇刊載內容。