海洋地质前沿2025，Vol.41Issue(8)：13-23,11.DOI:10.16028/j.1009-2722.2024.116
南科1井的地球化学特征及其与陆源输入的关系
Geochemical characteristics of Well NK-1 and their relationships with terrigenous input
摘要
Abstract
Coral reefs are one of the most important types of carbonate sediment,preserving vital information about the Earth surface history.Research on coral reefs primarily focuses on paleoecological,sedimentological,and petrographic aspects of reef systems,with comparatively limited investigation of terrigenous input.Extensive reef carbonates have developed in the South China Sea(SCS)since the Miocene,exhibiting high sensitivity to the ocean environment.In this study,we conducted stable isotopes and element analysis of coral reef(Well NK-1)samples in the Meiji atoll of the Nansha Islands.Our results reveal that the Sr and Li contents are parallel to the mineralogical composition,δ13C and δ18O values exhibit co-varying trend,collectively indicating that these ele-ments and stable isotopes are altered by the diagenetic processes.The Zr,Hf,and ∑REE+Y values exhibit poor re-lationships with δ18O values,indicating that they are insensitive to the diagenetic processes.Consequently,these elements can serve as reliable proxies for terrigenous input into the marine environment.Our study reveals that Zr,Hf,and ∑REE+Y contents remained relatively low during ca.23 to 17 Ma but exhibited a marked increase after ca.17 Ma.By comparing with existing paleoenvironmental records,we propose that the increased terrigenous in-put since～17 Ma likely reflects enhanced sediment delivery from the entire SCS drainage system,rather than be-ing dominated by discrete fluvial sources such as the Mekong,Pearl,or Red Rivers.We further suggest that aeoli-an contributions from the Chinese Loess Plateau played a negligible role in this sedimentary phenomenon.关键词
南沙群岛/生物礁/中新世/陆源输入/海水地球化学Key words
Nansha Islands/reef/Miocene/terrigenous input/seawater geochemistry分类
海洋科学引用本文复制引用
贾云霞,王钊,庞红丽..南科1井的地球化学特征及其与陆源输入的关系[J].海洋地质前沿,2025,41(8):13-23,11.基金项目
国家自然科学基金(42402194) （42402194）
教育部"春晖计划"项目(HZKY20220511) （HZKY20220511）
山西省基础研究计划项目(202403021222246) （202403021222246）
