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頁籤選單縮合
題 名 | A Preliminary Study on Sedimentary Environments of Choshui Fan-Delta=濁文扇洲之沉積環境初探 |
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作 者 | 陳文福; 袁彼得; | 書刊名 | 中國地質學會會刊 |
卷 期 | 42:2 1999.05[民88.05] |
頁 次 | 頁269-288 |
分類號 | 351.983 |
關鍵詞 | 沉積環境; 濁水扇洲; 地下地質; Sedimentary environment; Choshui fan-delta; Subsurface geology; |
語 文 | 英文(English) |
中文摘要 | 本研究以探井岩心之沈積相回推濁水扇洲末次冰期以來之古沈積環境。前人研究 本區探井岩心之古沈積環境,推論為辮狀河、氾濫平原、曲流、濱岸至淺海等沈積體系(Lai et al., 1996; Yuan et al., 1997)。因缺乏現生模式比對,沈積環境並未細分,例如“濱岸至 淺海環境”應可進一步細分。本文以扇洲中部、下部、邊緣之合興、海園、東石三口探井岩 心之岩性、沈積構造、化石等沈積特徵及伽瑪井測相,並以現生濁水扇洲為對照模式,探討 古沈積環境。結果共歸納十種沈積環境,解釋為辨狀河河道、辮狀河之溢岸堆積、曲流河、 曲流河之溢岸堆積、潮上帶、潮埔、海灘、濱面、大陸棚與大陸棚砂波等。三口探井岩心之 垂直變化,皆由河流環境劇變為大陸棚環境,然後漸漸變淺。此次環境劇變反應出全新世海 進至少漫過扇洲中部(合興探井),隨後因海水面靜止,扇洲逐漸向西疊進,造成環境逐漸淺 化。 |
英文摘要 | This paper presents sedimentary facies observable in borehole cores in the Choshui fan-delta and our interpretation on the paleo-sedimentary environments after the Last Glacial epoch. Previous studies have pictured that sedimentary environments of that fan-delta consist of braided river, overbank, meandering river, and coastal-shallow marine. We consider that such an interpretation is incomplete owing to lack of a modern analogue. In this study, the authors propose a modern fan-delta model and further subdivide the "coastal-shallow marine" environment into supratidal, tidal flat, beach, shoreface, and shelf. This study uses grain size, sedimentary structures, fossils, and natural gamma logs of the three borehole cores to elucidate the paleo-environments of the Choshui fan-delta. We discovered that the sedimentary environments changed rapidly from fluvial to shelf at the boundary of 40-50m depth. Such a drastic change records the Holocene transgression following the Last Glacial regression. After the transgression, sedimentary environment has been shallowing from shelf to fluvial, which can be interpreted as progradation of a fan-delta. |
本系統中英文摘要資訊取自各篇刊載內容。