冲绳海槽中段末次冰消期以来的元素地层

刘焱光; 孟宪伟; 李铁刚; 吴世迎; 王湘芹; 辛春英; 任红

冲绳海槽中段末次冰消期以来的元素地层

1.
国家海洋局, 第一海洋研究所, 山东, 青岛, 266061;海洋沉积与环境地质国家海洋局重点实验室, 山东, 青岛, 266061;中国海洋大学, 海洋地球科学学院, 山东, 青岛, 266003
2.
国家海洋局, 第一海洋研究所, 山东, 青岛, 266061;海洋沉积与环境地质国家海洋局重点实验室, 山东, 青岛, 266061
3.
中国科学院, 海洋研究所, 山东, 青岛, 266071

基金项目: 国家自然科学重点基金(49736210);国家自然科学基金(49706068,49873015)

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出版历程
- 收稿日期: 2002-01-25
- 修回日期: 2002-03-21

The elementary stratigraphy of the middle Okinawa Trough since the last deglaciation

1.
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Key Laboratory of Marine Sedimentology & Environmental Geology, Qingdao 266061, China;Ocean University of China, Qingdao 266003, China
2.
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Key Laboratory of Marine Sedimentology & Environmental Geology, Qingdao 266061, China
3.
Institute of Oceanography, Chinese Academy of Sciences, Qingdao 266071, China

摘要

摘要: 在对冲绳海槽中段180号岩心进行高分辨率取样的基础上,测定了沉积物中的23个地球化学指标,通过对各元素与Al₂O₃含量的比值在岩心中的垂向变化规律的分析,结合氧同位素、黏土矿物、粒度、AMS¹⁴C测年和R型因子分析方法,可将岩心从上至下划分为5层:第1,3,5层具有相似的元素组合特征,第2,4层为明显的异常变化层位,将元素的地球化学行为、元素组合与物质来源联系起来,并与碎屑矿物、古生物资料对比,探讨岩心中元素组合垂向变化的制约因素,据此讨论了冲绳海槽中段末次冰消期以来陆源、火山源及生物源物质的分布规律。结果表明,冲绳海槽中段末次冰消期以来的沉积物来源以陆源物质为主,但在局部层位可因生源组分和火山源组分的强烈影响而发生实质性的变化。
- 冲绳海槽 /
- 冰消期 /
- 元素地层学
Abstract: A gravity Core 180 was collected from the middle Okinawa Trough.The 305 cm long core was sampled at the interval of 5 cm.Twenty-three geochemical indexes of these samples were obtained on the basis of different analytical methods.According to the explanations for vertical changing regularity of the ratio of elements to A1₂O₃,δ¹⁸O records,clay mineral composition,grain size,combined with AMS¹⁴Cdetermination and factor analysis,Core 180 can be divided into five sections.The similar elementary combination characteristics exist in Sections 1,3 and 5,and different characteristics exist in Sections 2 and 4.Compared with detrital mineral and paleobiological analysis data,the distribution of the sedimentary compositions originated from continent,volcanic and biogenetic material has been discussed by means of correlation analysis of elementary geochemical behavior,elementary combination and sedimentary sources.The results show that the main sedimentary sources of the middle Okinawa Trough are terrigenous materials.But some essential changes maybe occur in the special layers due to the intensive influence of volcanic and biogenetic sediments.
- Okinawa Trough /
- last deglaciation /
- elementary stratigraphy

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