海洋地质与第四纪地质2024，Vol.44Issue(2)：97-109,13.DOI:10.16562/j.cnki.0256-1492.2023052203
南黄海SYS90-1A孔第四纪沉积物磁性地层学研究
Magnetostratigraphy of Quaternary sediments from borehole SYS90-1A in the South Yellow Sea
摘要
Abstract
Quaternary sediments in the southern South Yellow Sea provide important geological archives for addressing Quaternary sea-level changes and environmental evolution.However,long sedimentary sequences with a reliable chrono-logical framework in this area are scarce.A detailed paleomagnetism study on sediments from borehole SYS90-1A(90.1 m)that located in the southern South Yellow Sea was carried out in combination with AMS14C dating data and published studies regarded.Eleven normal inclination zones and 11 negative inclination zones in the borehole SYS90-1A were revealed from the characteristic remanent magnetization after alternating-field demagnetization.The Matuyama/Brunhes boundary was found at the core depth of～74.2 m.Meanwhile,the Kamikatsura excursion and Santa Rosa excursion were recognized at depth of 79.75～82.47m and 85.25～87.74m,respectively.The basal age of the core was estimated for about 0.96 Ma by the extrapolation of average sedimentation rate between the Kamikatsura excursion and Santa Rosa excursion.The average sedimentation rate of borehole SYS90-1A is 8.66 cm/ka in the late Early Pleistocene,9.5 cm/ka since the Middle Pleistocene,and 12.8 cm/ka since the start of the Holocene.The sedimentation rate of the core showed an increasing trend since the late Early Pleistocene.This study provided a reliable geochronological framework of the borehole,which facilitated the stratigraphic division and tectonic evolution of the Quaternary System in the southern South Yellow Sea and its neighboring regions.关键词
古地磁学/沉积速率/第四纪/中部泥质区/南黄海Key words
paleomagnetism/sedimentation rate/Quaternary/central mud area/South Yellow Sea分类
海洋科学引用本文复制引用
陆凯,强小科,孙军,李广雪,杨慧良,王忠蕾,梅西,陈晓辉,祁江豪,朱晓青..南黄海SYS90-1A孔第四纪沉积物磁性地层学研究[J].海洋地质与第四纪地质,2024,44(2):97-109,13.基金项目
中国地质调查局地质调查项目"深海调查-测量"(DD20230643,DD20191003),"东部重点海域海洋区域地质调查"(DD20221710),"1∶25万锦西、日照和霞浦县等图幅海洋区域地质调查"(DD20160139) （DD20230643,DD20191003）
