Sediment pathway of the East China Sea inferred from an R-mode factor analysis of surface sediments in the Okinawa Trough
Sediment pathway of the East China Sea inferred from an R-mode factor analysis of surface sediments in the Okinawa Trough
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冲绳海槽表层沉积物R模式因子分析推断东海沉积物路径
DOI：
10.1016/j.quaint.2009.11.025
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发表时间：
2011-01
影响因子：
2.2
通讯作者：
Li Tiegang
中科院分区：
文献类型：
--
作者：
Jiang Fuqing;Li Anchun;Li Tiegang
对东海陆架、陆坡和冲绳海槽北部190个表层沉积物样品的主量元素、微量元素、烧失量和粒度组成进行了测定。沉积物主要由砂和粉砂组成，粘粒含量一般较低（平均10.5%），从陆棚和陆坡到海槽，粘粒含量在0.12-53.6%之间增加。大陆架上的沉积物砂质较多，特别是在北方大陆架部分。化学成分的空间分布表明，桑迪陆架上SiO2、CaO、Sr含量和LOI值相对较高。而Al 2 O3、MgO、Na 2 O、MnO、FeO、TiO 2、Cu、Zn、Co、Ni、Cr等元素含量在海槽和沿着中西部陆架边缘较高，沉积物主要由粉砂组成。坡积物中Fe 2 O3、P2 O 5和Zr的富集程度最高。通过对化学成分的R型因子分析，提取了三个因子。因子1有两个负相关的元素组合：（1）SiO2、K2 O、TiO 2、Al 2 O3和Zr，它们与陆源碎屑的输入有关，在陆架南部表现出较高的正因子分数;（2）CaO、Sr和LOI，这可能与生物碎屑富集有关，并在北方陆架区和更受限制的沿着沿着的区域。CaO、SiO_2、K_2O和Sr代表陆架的元素组合。因子2包括Na_2 O、FeO、Al_2 O_3、TiO_2、Cu、Zn和Ni，在海槽沉积物中得分较高。Na_2 O、Cu、Zn、Ni代表了冲绳海槽的元素组合，与火山物质有关。因子3包括Fe 2 O3，MgO，Cr和Co，具有高因子分数的斜坡和沿着中西部陆架边缘的研究区，由于上升流引起的营养盐和生物壳的富集。Fe_2 O_3和MgO为斜坡元素。根据沉积物化学成分和元素组合在源汇系统中的分布结果，黄河对陆架的影响大于长江。从陆架、陆坡到海槽，黄河的影响逐渐减弱。冲绳海槽自北向南黄河沉积物减少，长江沉积物增加，化学成分发生变化。
Major and trace elements, loss on ignition (LOI), and grain-size distributions were determined on 190 surface sediment samples collected from the continental shelf, slope and the north Okinawa Trough in the East China Sea, at water depths of 100–200, 200–600 and more than 600m respectively. The sediments are composed mainly of sand and silt, generally low clay contents (average 10.5%), increasing over the range of 0.12–53.6% from the shelf and slope to the trough. Sediments were sandier on the continental shelf, particularly in the northern shelf sector. Spatial distributions in chemical compositions show that the contents of SiO2, CaO, Sr, and LOI values were relatively high on the sandy continental shelf. By contrast, the contents of Al2O3, MgO, Na2O, MnO, FeO, TiO2, Cu, Zn, Co, Ni and Cr were relatively high in the trough and along the central western shelf margin, where the sediments were composed mainly of silt. Fe2O3, P2O5and Zr enrichment was highest in the slope sediments. Three factors were extracted by means of an R-mode factor analysis of chemical composition. Factor 1 has two inversely correlated elemental assemblages: (1) SiO2, K2O, TiO2, Al2O3and Zr, which can be associated with terrigenous debris input and show high positive factor scores in the southern sector of the shelf; and (2) CaO, Sr, and LOI, which can be related with biogenic debris enrichment and show high negative factor scores in the northern shelf sector as well as in a more restricted area along the slope. CaO, SiO2, K2O and Sr represent the element assemblage of the shelf. Factor 2 comprises Na2O, FeO, Al2O3, TiO2, Cu, Zn and Ni, and shows high scores in the trough sediments. Na2O, Cu, Zn and Ni represent the elemental assemblage of the Okinawa Trough, and can be associated with volcanic matter. Factor 3 comprises Fe2O3, MgO, Cr and Co, with high factor scores on the slope and along the central western shelf margin of the study area, due to upwelling-induced enrichments in nutrients and biogenic shells. Fe2O3and MgO are the slope elements. Based on the results of the distribution of the chemical compositions and the elemental assemblage of the surface sediment in the source-to-sink system, the influence of the Yellow River on the continental shelf is stronger than that of the Yangtze River. From the continental shelf and slope to the trough, the influence of the Yellow River decreased. From north to south in the Okinawa Trough, the sediment from the Yellow River decreases and from the Yangtze River increases, and the chemical compositions changed.
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影响因子：
1.9
作者：
Allen W. Archer;R. A. Reyment;K. Jöreskog
通讯作者：
Allen W. Archer;R. A. Reyment;K. Jöreskog
影响因子：
5
作者：
B. Hitchon;G. K. Billings;J. E. Klovan
通讯作者：
B. Hitchon;G. K. Billings;J. E. Klovan
影响因子：
2.9
作者：
R. Shankar;K. Subbarao;V. Kolla
通讯作者：
R. Shankar;K. Subbarao;V. Kolla
影响因子：
5
作者：
M. Leinen;N. Pisias
通讯作者：
M. Leinen;N. Pisias
DOI：
--
发表时间：
2002
期刊：
--
影响因子：
--
作者：
Jiang Fu
通讯作者：
Jiang Fu