3.7 Ma以来西菲律宾海XT-4孔沉积物元素特征及其古环境指示意义  

Elemental geochemistry of Core XT-4 sediments from the western Philippines Sea since 3.7 Ma and its paleoenvironmental implications

作　　者：王晨 徐方建[2,3] 胡邦琦 徐磊[1,3] 丁雪 王飞飞[1,3] 黄威 郭建卫[1,3] WANG Chen;XU Fang-jian;HU Bang-qi;XU Lei;DING Xue;WANG Fei-fei;HUANG Wei;GUO Jian-wei(Qingdao Institute of Marine Geology,Qingdao 266071,China;School of Geosciences,China University of Petroleum,Qingdao 266580,China;Laboratory for Marine Mineral Resources,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266071,China;State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710061,China)

机构地区：[1]青岛海洋地质研究所,山东青岛266071 [2]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [3]青岛海洋科学与技术试点国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛266071 [4]中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,陕西西安710061

出　　处：《海洋科学》2020年第8期205-214,共10页Marine Sciences

基　　金：国家自然科学基金(41976192);黄土与第四纪地质国家重点实验室开放基金(SKLLQG1707,SKLLQG1805);中国地质调查局国家专项(DD20191010)。

摘　　要：对西菲律宾海盆南部XT-4孔柱状沉积物进行了元素地球化学分析,利用常量元素上地壳标准化图解和R型因子分析方法进行了物源探究,利用因子分析得出的陆源因子得分变化探讨了物源区的古环境演化。结果表明:XT-4常微量元素垂向上变化主要受控于亚洲内陆的风尘物质和周边火山物质的输入,海洋自生物质也有一定的贡献。以TiO2和K2O等元素为代表的陆源因子得分自3.7 Ma BP以来表现出阶段性上升的变化趋势,与中国黄土和北太平洋ODP 885/886站沉积物记录的东亚冬季风演化记录有着良好的对比性,同时与青藏高原主要的阶段性隆升时间相对应,响应了晚新生代以来青藏高原隆升对东亚冬季风加强的作用。本研究丰富了西菲律宾海盆的风尘沉积研究,为后续研究提供一定的认识基础。Elemental geochemical analysis was performed on core XT-4 sediments in the southern part of the Western Philippines basin;with the help of standardized crustal normalization diagrams and R-type factor analysis methods,the provenance of the source was investigated;and by factor analysis,the change of the terrestrial factor scores obtained and the evolution of the paleoenvironment in the provenance area are discussed.The results show that the vertical change of XT-4 normal trace elements is mainly controlled by the input of wind and dust materials and surrounding volcanic materials in Asia,and in addition,the marine biomass also contributes to this change.The terrestrial factor scores represented by elements such as TiO2 and K2O have shown a gradual upward trend since 3.7 Ma Bp,and have formed a obvious contrast with the evolution of the East Asian winter monsoon recorded in the sediments of the Loess and North Pacific ODP 885/886 stations.In addition,these trends correspond to the major periodic uplift times of the Qinghai-Tibet Plateau,and respond to the strengthening of the East Asian winter monsoon since the late Cenozoic.

关 键 词：西菲律宾海盆 物源 风尘 东亚季风 青藏高原隆升 

分 类 号：P736.21[天文地球—海洋地质]