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博碩士論文 etd-0727113-014618 詳細資訊
Title page for etd-0727113-014618
論文名稱
Title
上次冰期時濁水溪口岩心中陸相古沉積環境的解析
The terrestrial paleoenvironment analysis of the Jhoshui River Core at the Last Glacial
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
107
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2013-06-25
繳交日期
Date of Submission
2013-08-27
關鍵字
Keywords
似古土壤層、新仙女木時期、濁水溪沖積平原、紅化指數、古環境的變遷
past environment change, Younger Dryas, redness rating index, paleosol-like, Zhuoshui alluvial plain
統計
Statistics
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The thesis/dissertation has been browsed 5750 times, has been downloaded 1092 times.
中文摘要
過去對於濁水溪沖積平原的研究,受限於岩心取樣品質,未能建立高解析度沉積環境變化。為了解上次冰期時濁水溪沖積平原之古環境的變遷,及環境與氣候條件間的互動。本研究採用濁水溪河口南側鑽取之一根高回收率岩心(JRD-S)進行分析研究。岩心總長約102公尺,依次進行沉積學描述、照相以及使用分光光度計(Spectrophotometer)、多重感應元岩心紀錄器(MSCL)、岩心掃瞄儀(Itrax)進行連續掃描,同時採集沉積物樣品進行定年、粒徑及總有機碳(TOC)含量分析。一方面我們透過傳統沉積學方法,藉由古土壤的辨識特徵及量化顏色的紅化指數(RR),作為岩心中陸相地層分層的依據。另一方面我們使用EOF的分析方法,建立各連續掃描參數之間的共變性,從客觀的角度定義沉積相變化。
綜合以上,將(JRD-S)岩心中陸相沉積環境層位(-47.39 ~ -82.75 m)進一步分為三種沉積亞相:河道沉積層、淺水河漫沉積層、似古土壤層(受到風化作用沉積物)。其中似古土壤層分別位於高程-48.00 m ~ -49.00 m、-56.00 m ~ -59.00 m、-61.00 m ~ -63.35 m、-75.47 m ~ -77.00 m。將似古土壤所在層位與用AMS C-14定年方法所建立的時間模式比對,似古土壤層所發生的時間分別為11300 ~ 13400、23200 ~ 29300、29800 ~ 31500、49400~ 51800年前,這些時期皆屬於較乾冷的氣候條件,如:第一層古土壤層所存在的時間便與新仙女木時期(Younger Dryas)相呼應。對比於台灣現今的河流沉積環境,在高溫多雨及颱風影響的環境下,似古土壤這類的沉積會因強烈環境動力而不易被保存。相反的在乾冷的時期,則較容易被保存下來。顯示似古土壤可以作為乾冷時期的指標,此結果也與台灣其他區域的氣候研究結果相符。未來在其他類似的研究中,不僅可藉似古土壤層反應過去的氣候環境;也可依此特性將似古土壤層作為指準層,參照已知的乾冷事件,成為岩心時間模式中的參考點。
Abstract
Past studies on Zhuoshui alluvial plain were limited by the core quality that was not sufficient to build a high-resolution sedimentary environment interpretation. This study aims to understand the past environment change and identify the interplay between environmental and climatic conditions of the last glacial of the Zhuoshui alluvial plain. A core (JRD-S) of high recovery-rate obtained on the south side of Zhuoshui River mouth was used in this study. The core was 102 m long. The core processing and analysis included sedimentoloy description, photographing and scanings by Spectrophotometer, MSCL, and Itrax. Samples were collected for AMS C-14 dating, particle-size analysis and measurement of the organic carbon content. We use the traditional sedimentological approach, which included paleosol identification features and redness rating index to divide the identification the terrestrial facies. On the other hand, we used the empirical orthogonal/eigen function (EOF) analysis to characterize the co-variability of the continuous scanned parameters to define objectively the sedimentary facies change.
Based on the above, the terrestrial facies (-47.39 to -82.75 m) was divided further into three secondary sedimentary facies: fluvial channel facies, shallow water facies and paleosol-like (weathering sedimentary facies) facies. The paleosol-like layers were located on -48.00 to -49.00 m, -56.00 to -59.00 m, -61.00 to -63.35 m and -75.47 to -77.00 m. The age of paleosol-like layers were defining by the AMS C-14 age mode, each layer was formed at about 11300 to 13400, 23200 to 29300, 29800 to 31500 and 49400 to 51800 year BP. These periods were under the relatively dry and cold climatic conditions for example the age of first paleosol-like layers was corresponding to the period of Younger Dryas. In contrast to present fluvial environments of Taiwan, the present environment receives the impact from the monsoon and typhoons. The fine-grained sediments such as paleosol are difficult to be preserved in warm periods, but on the contrary the fine-grained sediments are easier to be preserved. This result shows that paleosol-like layers can be used as an indicator of cold, dry periods. The results are also consistent with other climate research on the regions of Taiwan. For other similar studies in the future we could use the paleosol-like layers as indices of cold, dry event evens as time points for dating.
目次 Table of Contents
致謝 i
摘要 ii
Abstract iv
圖目錄 viii
表目錄 xi
第一章 緒論 1
1.1 前言 1
1.2研究目的 3
第二章 研究區域 4
2.2地形、氣候概況及海洋作用 6
2.3流域地質概況 10
第三章 研究方法 13
3.1物理性質分析 14
3.1.1 岩心密度及磁感率分析 14
3.1.2 岩心沉積物表面反射色測量 15
3.2岩心掃描儀 (Itrax Core Scanner) 17
3.3岩心沉積物分析 20
3.3.1岩心描述 20
3.3.2粒徑分析 22
3.4 經驗正交函數EOF 25
第四章 結果與討論 27
4.1資料分析結果 27
4.1.1 MSCL和反射色資料分析 27
4.2沉積岩相分析初步結果 33
4.2.1岩心描述 33
4.2.2沉積環境 50
4.3似土壤層之特徵與建立 58
4.3.1由岩心中辨別受風化的沉積物 58
4.3.2似古土壤層所存在正確層位 64
4.4 經驗正交函數分析 68
4.4.1 EOF分析之參數設定 68
4.4.2第一組設定EOF分析結果 69
4.4.3第二組設定EOF分析結果 74
4.5 似古土壤層與古環境、古氣候之應用 79
第五章結論 83
參考文獻 86
中文部分 86
英文部分 91
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