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논문 기본 정보

자료유형
학위논문
저자정보

박수정 (부산대학교, 부산대학교 대학원)

지도교수
임현수
발행연도
2016
저작권
부산대학교 논문은 저작권에 의해 보호받습니다.

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이 논문의 연구 히스토리 (3)

초록· 키워드

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Korean peninsula is located in East Asia. Korean paleosol sequence constitutes an important record of variations in many climate changes such as East asian summer monsoon (EASM) and global cooling. Study site, located in southward of Han river, has 2.7 m length paleosol sequence. The goal of this study is to reconstruct of paleoenvironmental and paleoclimatic change of this site. The sedimentary section can be subdivided 3 layers (Upper part, Soil wedge layer, Lower part) in the basis of grain size, magnetic susceptibility, mineralogical and geochemical characteristics. The 8 age data obtained, using AMS and OSL, inferred that sediments deposited during the late Pleistocene and Holocene. Lower sequence accumulated near the fluvial environment, but finning upward grain size distribution reflects away from the fluvial environment. Soil wedges observed at around 90 cm in depth, one of distinctive lithologic features in the paleosol sediments, seem to have developed downward during the last glacial maximum and were eroded partly during the subsequent deglacial, resulting in a hiatus. Changes carbon isotope (δ¹³C) values of total organic carbon in the paleosols, a proxy for past relative abundance between C3 and C4 plants, revealed that C4 plant abundance in the study area during the period of 50~25 cal ka BP had been related to sea-level/ continental ice volume variability at multi-millennial timescales. According to East Asian summer monsoon variation, strong precipitation period appears near 30 ka. It is correlate with upper part. Thus, strong precipitation is affected ground surface and C3 plant grow well. However, accumulated at near the Last Glacial period, precipitation become intense temporary as a result of local morphology. During the Holocene, which has warmer condition, upper sediments are accumulated. Increase of total organic carbon, δ¹³C imply that C4 plant flourish under the arid condition and affect the organic content within the soil. Mineralogy and REE distributions of upper part matched with Chinese loess plateau sediments. The age of 60 cm depth is around 4,000 cal. yrBP, correlate with Aridity maximum, caused by weakening East Asian summer monsoon. The analytical results presented that soil profile had included several environmental and climatic change record. First of all, sediments accumulated with coarse grain under near-fluvial during in late pleistocene. Cooling of temperature lead to river level lower, soil profile away from the river. East Asian summer monsoon variation affected surface as precipitation intense in this period. Arrive of Last Glacial and deglacial period, sedimentation suspended because of strong winds and arid condition. Mineralogy and geochemical characteristics of upper section imply climate linkage of Korea peninsula and East China such as East asian monsoon. Weakening of East Asian summer monsoon lead to aridity condition over the east asia. In this period, Chinese eolian dust could input the study area. This study demonstrated that though high-resolution approach is difficult, paleosols can be used to trace multi-millennial to orbital scale climate change in Korea and provide a chance to understand local responses to global climate change.

목차

1. 서언 1
1.1. 연구 배경 1
1.2. 선행 연구 4
1.3. 연구 목적 12
2. 연구 지역 13
2.1. 하남의 지리적 위치 13
2.2. 하남 및 주변의 지질 18
2.3. 연구지역의 지형 발달 19
3. 연구 방법 23
3.1. 퇴적상 관찰 23
3.2. 입도 분석 25
3.3. 지화학 분석 25
3.4. 대자율 분석 26
3.5. 광물 및 원소 분석 26
3.6. 연대 분석 27
4. 연구 결과 30
4.1. 연대측정 결과 30
4.2. 퇴적상 변화 35
4.3. 입도 분포 40
4.4. 지화학 특성 41
4.5. 대자율 분포 43
4.6. 구성 광물 및 원소 46
5. 토의 51
5.1. 해석에 대한 고찰 51
5.2. 과거 48,000년 동안의 과거 퇴적환경 변화 52
5.3. 과거 48,000년 동안의 고기후고환경 변화 67
5.3.1. 중기-후기 홀로세 동안의 기후/환경변화 72
5.3.2. 후기 플라이스토세 동안의 기후/환경변화 77
6. 결론 77
참고문헌 79
Abstract 94

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