海洋地质与第四纪地质2025，Vol.45Issue(1)：93-108,16.DOI:10.16562/j.cnki.0256-1492.2024031801
末次盛冰期以来冰岛南部陆坡沉积物来源变化及其对周边冰盖消涨的响应
Changes in sediment sources in the southern slope of Iceland since the Last Glacial Maximum and their response to the adjacent ice sheets
摘要
Abstract
Changes of marine sedimentary environment since the Last Glacial Maximum(LGM)recorded in the core sediments of the southern slope of Iceland reflect millennial-scale changes in ice sheets and ocean currents.The age framework was established with AMS14C dating data of the ARC05/IS-2A core sediments in the southern slope of Iceland,and the grain size,color reflectance and high-resolution XRF element geochemical tests were carried out.According to the XRF spectrometer analysis results,the main material source of the IS-2A core sediment was determined through factor analysis method.Combined with previous studies on the changes of ice sheets and ocean currents in North Atlantic,the evolution of sediment sources on the southern slope of Iceland since the LGM was reconstructed,and the relationship between the changes of sediment sources and activities of the surrounding major ice sheets was discussed.Results show that the sediments of IS-2A core are mainly terrigenous since the LGM.Detritus in sediment indicate the main source areas from the Iceland Ice Sheet(IIS),the British-Irish Ice Sheet(BIIS),and the Finnoscandia Ice Sheet(FIS).In the early last deglaciation,terrigenous detritus were increased as a whole,came mainly from IIS,FIS and BIIS,as well as the distal Laurent ice sheet(LIS).In the middle and late period of the last deglaciation,due to the weakening of transport conditions,the terrestrial input of LIS decreased,reflecting the restriction of ice sheet on the sediments supply to the study area.In the Holocene,the modern ocean current system was formed.Under the combined action of the Iceland-Scotland Overflow Water and the North Atlantic Current,sediments mainly came from Iceland and western Europe,and partially from the detritus of the Labrador Peninsula.关键词
陆坡沉积物/物质来源/因子分析/冰岛南部/末次盛冰期Key words
slope sediments/sediment provenance/factor analysis/southern Iceland/Last Glacial Maximum分类
海洋科学引用本文复制引用
孙舒玮,赵嵩,刘焱光,吴东,胡宁静..末次盛冰期以来冰岛南部陆坡沉积物来源变化及其对周边冰盖消涨的响应[J].海洋地质与第四纪地质,2025,45(1):93-108,16.基金项目
国家自然科学基金"末次间冰期以来北欧海南部洋流变动对大西洋经向翻转流及气候的影响:陆源与自生组分钕同位素证据"(41676053),"晚始新世以来北极重大冰增事件及其演进过程:基于北欧海西部海域的沉积物地球化学记录"(42076079) （41676053）
