珠江三角洲全新统横栏组淤泥沉积中的有机碳、总氮和碳氮比值记录

The Records of TOC,N and C/N Ratios in Mud Sediments of the Henglan Formation (Middle Holocene) in the Pearl River Delta Area

对广州番禺区ZK5孔中全新统横栏组淤泥沉积进行了总有机碳、总氮含量和碳氮比值分析。根据其变化可划分 2个不同的沉积环境阶段。阶段Ⅰ ( 15 8～ 9 0m)的总有机碳含量变化幅度较大 ,总氮含量很低 ,碳氮比值较高。表明其有机质以陆源为主 ,有机质生产力明显受气候的控制。阶段Ⅱ ( 9～ 1 4m)总有机碳和总氮含量上升 ,变化较小 ,而碳氮比值下降。表明其主要受海洋的影响 ,有机质主要来源于原地浮游生物。

Total organic carbon, total nitrogen content and C/N ratios in mud sediments of the Henglan Formation in core ZK5 in the Pearl River Delta area are investigated to determine environmental changes. Two stages can be recognized. The first stage(15.8～9.0 m) is characterized by regular variation in TOC, lower N and higher C/N ratios. This indicates that the organic matter is of terrestrial origin. The second stage(9.0～1.4 m) is marked by higher TOC and N, and lower C/N values. The principal source of organic matter is autochthonous productivity.