海洋地质前沿2024，Vol.40Issue(6)：26-38,13.DOI:10.16028/j.1009-2722.2023.198
潟湖岩芯沉积对海平面变化和物源的响应
Sedimentary characteristics of a drilling core from the Zhongsha atoll lagoon:responses to sea level and provenance changes
摘要
Abstract
Based on thin-section observation,dating results,analysis of major and minor elements and carbon and oxygen stable isotopes,the sequence stratigraphy,sedimentary facies and geochemical characteristics of a 50.5-m drill core in the atoll lagoon were examined and its significance for paleoclimate and paleoenvironment was ex-plored.Results show that sedimentary features well responded to the Late Quaternary sea level change and provenance.Using dating results,ten Pleistocene sequences were correlated with interglacial stages during Mar-ine Isotope Stages 5-23.The gradual decrease in Sr and U values is due to the longer duration of exposure and meteoric diagenesis of the older sequence relative to the younger sequence in the carbonate platform,clearly indic-ating the existence of a sequence boundary.The reef facies were formed mainly during sea level fall,indicating progradational growth of the reef.Rapid sea level rise and slow sea level fall lead to reef facies preferring to grow in the highstand systems tracts of the sequences.Four potential sources were identified from the combined PMF(positive matrix factorization)factor profiles and factor contributions.Our results indicate the drilling reef layers in the modern lagoon can well reflect the sea level change controlled by the eccentricity cycles of 100 ka and that greater reef thickening of aggradational reef in the marginal platform than that of progradational reef in the lagoon,which enriched our understanding of the evolutional processes of the atoll with a deep lagoon.关键词
生物礁/沉积微相/地球化学/晚第四纪海平面变化/中沙环礁潟湖钻孔Key words
biogenic reefs/sedimentary facies/geochemical characteristics/Late Quaternary sea level change/drilling core from Zhongsha atoll lagoon分类
海洋科学引用本文复制引用
龙根元,陈万利,陈波,吴时国,张从伟,姜海滨,魏浩天,李秋环..潟湖岩芯沉积对海平面变化和物源的响应[J].海洋地质前沿,2024,40(6):26-38,13.基金项目
海南省海洋地质资源与环境重点实验室开放课题项目(HNHYDZZYHJKF003,HNHYDZZYHJKF017) （HNHYDZZYHJKF003,HNHYDZZYHJKF017）
南海地质构造研究项目(T100731) （T100731）
海南省科技计划三亚崖州湾科技城联合项目(2021JJLH0047) （2021JJLH0047）
中国博士后科学基金(2021M703667) （2021M703667）
广东省区域联合基金-青年基金(2021A1515110844) （2021A1515110844）
