Geochemistry of rare earth elements in the mid-late Quaternary sediments of the western Philippine Sea and their paleoenvironmental significance
Geochemistry of rare earth elements in the mid-late Quaternary sediments of the western Philippine Sea and their paleoenvironmental significance
复制标题
菲律宾海西部中晚第四纪沉积物稀土元素地球化学及其古环境意义
DOI：
10.1007/s11430-013-4786-z
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Lim DhongIl
中科院分区：
文献类型：
--
作者：
Xu ZhaoKai;Li TieGang;Wan ShiMing;Yin XueBo;Jiang FuQing;Sun HanJie;Choi JinYong;Lim DhongIl
基于δ 18 O年代学，对西菲律宾海MD 06 -3047孔沉积物中的稀土元素和其它典型元素进行了分析，以确定沉积物的物源，并探讨近700 ka来亚洲风成输入的数量变化。在可能影响稀土元素组成的竞争过程中，沉积物物源是最重要的竞争过程。物源分析表明，研究沉积物有两个物源端员，本地火山源占主导地位，来自亚洲大陆的风尘贡献较小。在冰期，风成输入到西菲律宾海增强。相反，在间冰期，来自当地火山岩的物质供应增加。在轨道时间尺度上，研究区风成输入的变化可能与东亚冬季风（EAWM）的强度和亚洲大陆的干燥度有关，在较短时间尺度上，部分受局地控制因子的影响。因此，我们建议，本研究扩大了应用REE为基础的方法定量估计风成分量从中纬度北方太平洋低纬西太平洋。此外，研究初步证实了700 ka以来EAWM输送的风成物质对西菲律宾海沉积的影响。
Based on aδ18O chronology, rare earth elements (REE) and other typical elements in sediments from core MD06-3047 in the western Philippine Sea were analyzed to constrain the provenances of the sediments and investigate quantitative changes in the Asian eolian input to the study area over the last 700 ka. Among the competing processes that might affect REE compositions, sediment provenance is the most important one. Provenance analysis suggests that the study sediments have two provenance end-members; local volcanic sources are dominant, and eolian dust from the Asian continent has a smaller contribution. During glacial periods, eolian input to the western Philippine Sea was enhanced. In contrast, material supply from local volcanics increased during interglacial periods. Changes in eolian input to the study area were probably related to the strength of the East Asian winter monsoon (EAWM) as well as aridity in the Asian continent on an orbital time scale, and were partly influenced by local control factors on shorter time scales. Therefore, we propose that the present study expands the application of the REE-based method for quantitatively estimating the eolian component from the mid-latitude northern Pacific to the low-latitude western Pacific. Additionally, the study preliminarily confirms the influence of EAWM-transported eolian material on sedimentation in the western Philippine Sea since 700 ka.