末次冰期以来南海北部下陆坡区沉积有机质地球化学特征及其意义
Geochemical characteristics of sedimentary organic matter from the lower slope facies of northern South China Sea since the last glacial and significance
查看参考文献49篇
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文摘
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选取南海北部下陆坡-深海平原过渡带典型沉积柱状样, 通过对其沉积有机质的整体有机地球化学特征进行表征, 探讨了南海下陆坡-深海平原区沉积有机质在冰期/间冰期旋回中的赋存状态、来源变化以及与古气候环境之间的相应关系。结果表明, 总有机碳(TOC)、总氮(TN)和有机质稳定碳同位素(δ~(13)C_(org))与冰期/间冰期旋回有明显的对应关系, 冰期时对应高值, 间冰期时对应低值; 而有机质稳定氮同位素(δ~(15)N)表现为全新世时其值偏低, 末次冰消期其值偏高, 与气候旋回没有相关性; C/N 值和δ~(13)C_(org)值都表明南海北部下陆坡沉积有机质来源是陆相和海相的混源, 且在末次冰期/间冰期尺度上主要以海相来源为主。 |
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其他语种文摘
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The content and source of organic matter and paleoclimate/paleoenvironment in the glacial-interglacial climate cycles were investigated concerning the core samples collected from the northern South China Sea. Significant relationships were observed among total organic carbon (TOC), total nitrogen (TN), δ~(13)C_(org) and climatic cycles, generally with higher values for the glacial stage than those for the interglacial period. δ~(15)N did not reveal distinct relationship between glacial and interglacial climate cycles. Lower values of δ~(15)N were observed during the Holocene compared to the last deglaciation. C/N ratios and stable carbon isotope composition(δ~(13)C_(org)) suggested mixed origins from both terrigenous and marine organic matter within the down-slope of the northern South China Sea, with more contribution from the marine source. |
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来源
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地球化学
,2014,43(5):538-546 【核心库】
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关键词
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末次冰期
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稳定碳/氮同位素组成
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南海北部下陆坡
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地址
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1.
中国科学院广州地球化学研究所, 广东, 广州, 510640
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国土资源部海底矿产资源重点实验室, 国土资源部海底矿产资源重点实验室, 广东, 广州, 510760
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0379-1726 |
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学科
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地质学 |
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基金
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国家自然科学基金
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国土资源公益性前沿技术探索研究项目
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文献收藏号
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CSCD:5268928
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