海洋地质前沿2026，Vol.42Issue(9)：23-32,10.DOI:10.16028/j.1009-2722.2025.184
西北印度洋钙质生物碎屑埋藏特征的时空变化及其对深层海水溶蚀作用的指示
Spatiotemporal variation in burial characteristics of calcareous bioclasts in the northwestern Indian Ocean and the implication for deep-sea water dissolution
摘要
Abstract
The preservation state of marine calcareous bioclasts during settling and burial in deep sea is a key in-dicator to the deep-sea carbonate dissolution and carbon cycling.Through a multi-proxy analysis of three sedi-ment cores(Core 20,21,24)from water depths of 3 716-4 736 m in the northwestern Indian Ocean,including frag-mentation ratio,elemental contents(Ca,Fe),calcium carbonate content,grain size,and color(L* value,gray level),the burial characteristics and main controlling mechanisms of calcareous bioclasts in shallow subsurface(0-2 m)sediments were revealed.Results show that:① The fragmentation ratio is positively correlated with water depth and dissolution intensity;it increases significantly with depth and exhibits marked variations within the same core,showing a strong negative correlation with calcium carbonate content.② Sediment lightness/darkness is related to the Ca/Fe ratio:high-calcium layers appear milky white with high L* values and low gray levels,in-dicating well-preserved shells under weak dissolution;high-iron layers are dark brown with low L* values and high gray levels,reflecting increased breakup under strong dissolution.③ The fragmentation ratio shows millen-nial-to orbital-scale rapid fluctuations,suggesting that the deep-sea dissolution in this region was driven by changes in primary productivity or ocean convection.This study provided high-resolution sedimentological evid-ence for understanding deep-sea carbon cycling and paleo-oceanographic environmental evolution in the area.关键词
西北印度洋/钙质生物碎屑/碎壳率/深海溶蚀/埋藏特征Key words
Northwestern Indian Ocean/calcareous bioclasts/fragmentation ratio/deep-sea dissolution/burial characteristics分类
海洋科学引用本文复制引用
唐盟,张强,殷征欣,陈亮..西北印度洋钙质生物碎屑埋藏特征的时空变化及其对深层海水溶蚀作用的指示[J].海洋地质前沿,2026,42(9):23-32,10.基金项目
自然资源部南海调查中心博士科研启动基金(MESTA-2023-E004) （MESTA-2023-E004）
南海局科技发展基金(240106、230204) （240106、230204）
广州市科技大脑项目(2023A04J1992) （2023A04J1992）
广东省人才计划项目(2024TQ08A660) （2024TQ08A660）
