摘要
南海北部陆坡柱状沉积物的常量元素统计分析表明,沉积物中的Ti、Al、Fe、K、Mn、Mg代表了陆源元素组合;而消除粒度效应的陆源元素比值Al/Ti、Fe/Ti和K/Ti等的变化曲线与浮游有孔虫氧同位素曲线对比表明,在气候变冷事件(Heinrich事件、Younger Dryas事件、PME斜室普林虫低值等事件)期间,陆源常量元素比值明显降低。这一对应特征,一方面体现了气候变冷事件的发生对陆源区化学风化强度的制约,另一方面也说明与指示长时间尺度气候相似,陆源元素比值对短时间尺度的气候变化也具有明显的指示作用。
The statistical results of major elements in the sediments collected from northern slope of the South China Sea indicate that the terrestrial element association are Ti,A1,Fe,K,Mn, Mg . The comparison of the Ti normal- ized ratios of the major elements curves (such as A1/Ti,Fe/Ti and K/Ti) and planktonic foraminifera oxygen iso- topic curve are presented that, during the cooling events (Heinrich event, Younger Dryas event, PME event), the terrestrial major element ratios decreased significantly. On one side, these characteristics of major elements show that the cooling events might influence the chemical weathering intensity in terrigenous area, on the other, it also plays an obvious indication role in short time scales climate changes, which is similar to indicating large time scales climate changes.
出处
《海洋学报》
CAS
CSCD
北大核心
2013年第4期106-111,共6页
基金
国家自然科学基金项目--晚第四纪南海水合物潜在分布区甲烷释放通量及其对气候变化的影响(40776033)
国家海洋局第一海洋研究所基本科研业务专项资金项目(2012G06)
国家自然科学基金项目--2Ma来东亚季风演化和青藏高原快速隆升在南海沉积物中的Pb-Sr同位素记录(40576034)
973计划项目--典型户后盆地热液活动及其成矿机理(2013CB429700)
关键词
南海北部陆坡
常量元素比值
陆源元素组合
冷事件
化学风化强度
northern slope of the South China Sea
major elements ratios
terrestrial element association
cooling events
chemical weathering intensity