海洋地质与第四纪地质2025，Vol.45Issue(2)：68-78,11.DOI:10.16562/j.cnki.0256-1492.2024050901
西北印度洋底层水组成:来自表层沉积物Nd同位素和氧化还原敏感元素的证据
Composition of deep water in the northwestern Indian Ocean:Evidence from Nd isotopes and redox sensitive elements of surface sediments
摘要
Abstract
The Indian Ocean deep water,as an important part of the global ocean circulation,is composed of mainly the Antarctic Bottom Water(AABW)and North Atlantic Deep Water(NADW),which is currently a research hot topic of marine substance circulation and environmental changes.We discussed the deep water redox state and composition of the bottom water through the analyses of Nd isotopes,redox-sensitive elements,total organic carbon of surface sediments in the northwestern Indian Ocean.Results show that sensitive elements such as Mn,Mo,and Ni indicated that the study area was generally in an oxidizing environment,and there was a strongly oxidizing area in the south side of the ridge.The εNd ranged from-7.16 to-8,indicating that the bottom water were mainly composed of AABW,and almost no NADW.Due to a certain amount of dust input,the study area has heavier εNd records compared with adjacent areas.The heavier εNd is indicative of an increased AABW contribution in the south,which may be influenced by the strong equatorial eastward flow within the Somali Basin.We revealed the characteristics of redox-sensitive elements and Nd isotopes of surface sediment and their possible influencing factors,and especially provided an important reference for subsequent in-depth research on bottom water.关键词
表层沉积物/氧化还原敏感元素/Nd同位素/南极底层水/西北印度洋Key words
surface sediment/redox-sensitive elements/Nd isotope/Antarctic Bottom Water/Northwest Indian Ocean分类
海洋学引用本文复制引用
黄子钊,乔淑卿,金丽娜,李小艳,陈亮,刘强,殷征欣..西北印度洋底层水组成:来自表层沉积物Nd同位素和氧化还原敏感元素的证据[J].海洋地质与第四纪地质,2025,45(2):68-78,11.基金项目
国家自然科学基金"MIS7期以来热带西印度洋底层水演化及其环境气候效应"(42376083),"中印度洋脊侧翼断裂带内钙质浊流沉积过程及其对地震活动的响应"(42206072) （42376083）
科技部国家重点研发项目"晚新生代亚洲大陆风化过程、沉积记录及碳汇效应"(2022YFF0800503) （2022YFF0800503）
