冲绳海槽DGKS9604孔酸不溶相中常量元素组成及环境指示意义  

Geochemical Compositions and Paleoenvironmental Implication of the Residual Fractions of Core DGkS9604 Sediments in the Middle Okinawa Trough

作　　者：束振华[1] 杨守业[1] 窦衍光[1] 刘振夏[2] 余华[2] Serge Berne 

机构地区：[1]同济大学海洋地质国家重点实验室,上海200092 [2]国家海洋局第一海洋研究所,山东青岛266061 [3]IFREMER,G6osciences Marines BP 70,29280 Plouzane,France

出　　处：《热带地理》2009年第3期236-240,273,共6页Tropical Geography

基　　金：国家自然科学基金项目(40676031);国家基础研究计划项目(2007CB815906)

摘　　要：运用1N HCl对冲绳海槽中部西陆坡DGKS9604孔沉积物样品进行预处理得到酸不溶相组分，利用ICP-AES分析常量元素的含量。结果显示主要氧化物与A1203的比值以及氧化物通量在垂向上呈规律性变化，反映了近30ka以来的元素地层以及沉积古环境对沉积地球化学组成的影响。30～22ka、17．8～11．8ka、7～3．5ka和2kaB．P．以来氧化物通量高于末次冰盛期和全新世早期。主要氧化物组成记录了7．4Calka和25．8CalkaB．P.两次火山事件；因子分析揭示钻孔中主要氧化物含量在垂向上的变化主要受沉积物源、热液活动、沉积动力环境及火山活动等多因素影响。The sediment samples were collected from the Core DGKS9604 taken from the middle Okinawa Trough for major elemental analysis using ICP-AES. The result shows that absolute concentrations, the ratios of major oxides to Al2O3 and accumulation rates of the major elements indicate regular vertical variations, revealing the complex influence of elemental stratum and depositional environments on sedimentary geochemical compositions in the middle Okinawa Trough over the last 30ka. Sediment accumulation rates during 30-22 kaBP, 17.8-11.8 kaBP, 7-3.5 kaBP and 0-2 kaBP are higher than those in the last glacial maximum and early Holocene. The major elemental compositions recorded two volcanic events in 7.4 kaBP and 25.8kaBP. Overall, the variations of major oxides in the core sediments are controlled by the changes of sediment provenance, paleoenviromental evolution and ocean current during the late Quaternary.

关 键 词：沉积物 冲绳海槽 常量元素 古环境 

分 类 号：P736.4[天文地球—海洋地质]