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Sedimentary organic matter analysis for the studies of sea-level and climatic changes in estuary and nearshore environments

用于研究河口和近岸环境的海平面和气候变化的沉积有机质分析

基本信息

批准号：
13440146
负责人：
HONAYAGI Koichi
金额：
$ 9.28万
依托单位：
Shinshu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

We carried out grain-size, organic matter composition, and total organic carbon (TOC) analyses, using the cores of modern lake sediment from Lake Kizaki and Pleistocene marine shelf sediment of Inubou Group in 2001. As the results, surface lake sediments contain 50 to 60 percents of amorphous organic matter and they varied with climatic change. Shelf sediments also include much amorphous organic matter and the proportions of them were various with climatic change.In 2002, we drilled 50 m and took successive cores at two sites on the Niigata Plain for the study of facies and sequence analyses, insoluble particulate organic matter composition, and total organic carbon (TOC) and total surfer (TS) analyses in 2002. The Niigata Plain is situated in the central part of the main Japanese Island. Holocene sediment in the Niigata Plain is more than 140 m in thickness.Incised valley sediment is composed of transgressive (TST) and highstand (HST) systems tracts. The maximum flooding surface(MFS) … More is set up at the most fine-grained part of clayey silt. Age of the maximum flooding stage can be estimated to be 7,800 years B.P.TST is composed of the bayhead delta and estuarine lagoon sediments and their TOC contents are 0.5 to 1%. HST consists of lagoon and fluvial sediment. TOC contents increase upward in HST sediments. TS content of the HST lagoon sediment is higher than that of the TST lagoon sediment. HST lagoon was much stagnant than TST lagoon, because the estuary mouth was closed by the adjacent delta system.Lagoon and fluvial sediments have high contents of land-derived organic matter, such as sporinite, cutinite, vitrinite, and non-fluorescent amorphous organic matter(NFA). Marine organic matter, such as alginite, is rarely found, but it increases seaward. Degradation and preservation of organic matter are depended on sea floor condition. Since the compositional variation of organic matter is controlled by sedimentary environments and sea-level position, integration of facies, organic matter, TOC and TS analyses make it possible for precise sequence interpretation of incised valley fill sediments. Less

2001年，我们利用木崎湖现代湖泊沉积物的核心和犬房群更新世海陆架沉积物进行了粒度、有机质成分和总有机碳（TOC）分析。结果表明，表层湖泊沉积物含有50％至60％的无定形有机质，并且它们随气候变化而变化。陆架沉积物中还含有大量非晶态有机质，其比例随气候变化而变化。2002年，我们在新泻平原的两个地点钻探了50 m，连续取芯，进行了相和层序分析、不溶性颗粒有机质组成以及2002年总有机碳（TOC）和总冲浪者（TS）分析。新泻平原位于日本主岛的中部。新泻平原全新世沉积物厚度超过140 m。切谷沉积物由海侵（TST）体系域和高位（HST）体系域组成。最大淹没面（MFS）设置在粘土质粉砂的最细粒部分。最大洪水阶段的年龄估计为 7,800 年 B.P.TST 由湾头三角洲和河口泻湖沉积物组成，其 TOC 含量为 0.5 至 1%。 HST 由泻湖和河流沉积物组成。 HST 沉积物中 TOC 含量向上增加。 HST泻湖沉积物的TS含量高于TST泻湖沉积物。 HST泻湖比TST泻湖停滞得多，因为河口被邻近的三角洲系统封闭。泻湖和河流沉积物具有较高含量的陆源有机质，如孢子体、角质体、镜质体和非荧光无定形有机物（NFA）。海洋有机物，如褐藻土，很少发现，但向海方向增加。有机物的降解和保存取决于海底条件。由于有机质的成分变化受沉积环境和海平面位置控制，相、有机质、TOC和TS分析的结合使得对切谷充填沉积物进行精确的序列解释成为可能。较少的