沉积学报2024，Vol.42Issue(3)：944-955,12.DOI:10.14027/j.issn.1000-0550.2022.104
马里亚纳海沟"挑战者"深渊沉积物地球化学特征及成因机制
Geochemical Characteristics and Formation Mechanism of Sediments from the Challenger Deep in the Southern Mariana Trench
摘要
Abstract
[Objective]To investigate the hadal sediments main type,geochemical characteristics and formation in the Challenger Deep of the southern Mariana Trench,[Methods]the mineralogical and geochemical analysis were uesd to study the sediments and altered basalt from north slope(overlying plate)and axis to the south slope(subduc-tion plate)at the Challenger Deep of the Mariana Trench.[Results and Conclusions]The hadal sediments can be divided into four types:red deep-sea clay,siliceous sediments,micromanganese-rich sediments,and calcareous sediments.The red deep-sea clay is the most common type of hadal sediment,which contribute the most to subducted sediments.Major and trace element geochemical characteristics are similar to those of altered basalt of the oceanic crust,which imply that red clay is mainly derived from the basalt alteration of the subducted and overlying plates,rather than the volcanic and terrestrial inputs.Moreover,intensified organic matter diagenesis has an important in-fluence on the geochemical properties of the hadal sediments,which is the main reason the Challenger Deep sedi-ments have lower rare earth elements and enrich more micromanganese nodules than the adjacent deep-sea sediments.关键词
马里亚纳海沟/挑战者深渊/沉积物/成因机制Key words
Mariana Trench/Challenger Deep/sediment/formation mechanism分类
天文与地球科学引用本文复制引用
谢桐桐,彭晓彤,柳双权,许恒超,徐文景..马里亚纳海沟"挑战者"深渊沉积物地球化学特征及成因机制[J].沉积学报,2024,42(3):944-955,12.基金项目
中国科学院战略性先导科技专项(XDB06020000)[Foundation:The Strategic Priority Research Program of the Chinese Academy of Sci-ences,No.XDB06020000] （XDB06020000）
