THE CHARACTERIZATIONS AND PALEOCEANOGRAPHIC SIGNIFICANCES OF ORGANIC AND INORGANIC CARBON IN NORTHERN SOUTH CHINA SEA DURING PAST 40 KA
THE CHARACTERIZATIONS AND PALEOCEANOGRAPHIC SIGNIFICANCES OF ORGANIC AND INORGANIC CARBON IN NORTHERN SOUTH CHINA SEA DURING PAST 40 KA
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发表时间：
2008
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通讯作者：
He Juan
中科院分区：
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作者：
He Juan
测定了南海北坡17937岩心近40ka的总有机碳（TOC）和无机碳（TOC）含量。结果表明，冰期TOC值高于间冰期TOC值，但碳酸盐含量与冰期TOC值相反。C/N元素比和双组分公式分析表明，研究区TOC主要来自原生生物，全新世TOC的相对比例超过80%。根据TOC和两种输入的相对百分比计算，MIS2海洋生物的TOC含量较高，表明末次冰期海洋生产力较高，这是由于冬季季风加强，水体深度混合改善，营养供应增加，陆源输入增加所致。该区碳酸盐含量具有陆源沉积稀释作用的“大西洋式”特征，早-中全新世出现低碳酸盐事件，这可能是陆地快速稀释、碳酸盐强烈溶解和海洋初级生产力降低的综合结果。
The content of total organic carbon(TOC) and inorganic carbon during the past 40 ka were measured in core 17937 from the northern slope of South China Sea.The results showed that the TOC exhibited higher values in glacial period than in interglacial periods,but with reverse pattern for the carbonate content.The element ratio of C/N and two components formula analysis indicate that the TOC in the studied area is mainly from the aboriginal organisms,with a relative percent over 80% in Holocene.Calculation from the TOC and the relative percent of the two kinds inputs implied TOC content of the marine organisms was higher in MIS2,indicating higher marine productivity during the last glacial due to the enhanced nutrition supply by the improved water deep-mixing by strengthened winter monsoon and increased terrigenous inputs.Carbonate content in the area was characterized by "Atlantic Style" by terrigenous sediment dilution and a low carbonate event was found during early-middle Holocene which may be the integrated result of rapid land dilution,strong carbonate dissolution and lower marine primary productivity.