南海北部191柱状沉积物主元素特征及其古环境意义

赵宏樵; 韩喜彬; 陈荣华; 初凤友; 高水土

南海北部191柱状沉积物主元素特征及其古环境意义

国家海洋局, 第二海洋研究所, 国家海洋局海底科学重点实验室, 浙江, 杭州, 310012

基金项目: 国家重点基础研究发展规划资助项目(G20000467)

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出版历程
- 收稿日期: 2007-03-12
- 修回日期: 2008-09-22

Charicteristics of main elements and their palaeoenvironment significance of Core 191 in the northern South China Sea

Laboratory of Submarine Geosciences of State Oceanic Administration, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

摘要

摘要: 应用XRF法对南海北部陆坡191柱状沉积物中主元素进行分析,结果显示,全柱沉积物中SiO₂含量最高,其次是CaCO₃,Al₂O₃和CaO。在垂向分布上CaCO₃和CaO含量分布基本一致,SiO₂,Al₂O₃,Fe₂O₃,K₂O,MgO含量变化相似。结合AMS碳-14测年,可将191柱状样划分为5个地球化学层,主元素和MgO与Al₂O₃含量比值在垂向上的旋回变化反映了南海北部氧同位素3期以来末次冰盛期、冰后期、晚冰期的气候变化、海平面波动及陆源物质供应的变化,并对Heinrich事件、格陵兰高频气候振荡(D/O)旋回、新仙女木事件以及普林斜氏虫低值事件等全球性短周期气候事件有很好的对应关系,但受区域影响,在时间上有所滞后。氧同位素3期以来的沉积速率并未显示出南海普遍存在的间冰期比冰期、暖期比冷期的沉积速率低的规律,而是逐渐减小的,这可能是氧同位素3期频繁的冷热干湿气候振荡导致岩石易于风化破碎受侵蚀后被洪水搬运的缘故。
- 南海 /
- 主元素 /
- 古环境 /
- 短周期气候变化 /
- 沉积速率
Abstract: The main elements of Core 191 are analyzed using the method of XRF in the northern South China Sea.The results show that the main element of the highest content is SiO₂, the next is CaCO₃, Al₂O₃ and CaO.In the vertical distribution the content of CaCO₃ is coincident with that of CaO, and the content of SiO₂ is similar to that of Al₂O₃, Fe₂O₃, K₂O and MgO.Combined with the dating of AMS(carbon-14), five geochemistry layers are divided, this is indicated that the changing of main elements and the content ratio of MgO to Al₂O₃ along the core have reflected the evolution of climate, sea level and terrigenous mater supply since oxygenisotope Stage 3 in the northern South China Sea.And the changing has good corre-spondence to short period global climate change such as Heinrich event, Dansgaerd-Oeschger gyration, Younger Dry as event and Pulleniatina obliquiloculata event, just little late to Greenland Island ice core because of regional response.Since oxygenisotope Stage 3, the deposited rate in the study area has dropped, not as the common result that the deposited rate in interglacial stage or warm period is higer than that in glacial stage or cold period in orther areas of the South China Sea.The reason is that rocks are easier to weathering and to eroding in the frequent climate oscillation of heat and cold or dryness and wetness in this stage.
- South China Sea /
- main elements /
- paleoenvironment /
- short period global climate change /
- deposited rate

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