【摘要】：本文對取自羅斯海陸架的JB04巖心沉積物進行AMS14C測年、粒度、有機碳等測試,結合沉積物粒度組分因子分析,研究該巖心的沉積學記錄,探討其古海洋學意義。結果顯示:JB04巖心沉積物的底部年齡為15ka;沉積物粒度組分因子分析提取出3個環(huán)境敏感粒級,分別代表正常冰海沉積、低能海洋沉積和高能海洋沉積;綜合沉積物巖相及沉積物組成特征,可以將巖心分為4段,從底部到頂部依次為主要受冰蓋刮蝕影響的冰蓋下沉積、屬低能海洋環(huán)境的冰架下沉積、屬高能海洋環(huán)境的冰架前緣沉積和主要受冰山影響的季節(jié)性海冰區(qū)沉積。該巖心的沉積地質記錄及其古海洋學研究對全面認識羅斯海的海洋環(huán)境演變具有重要的意義。
[Abstract]:In this paper, AMS14C dating, particle size, organic carbon and other tests were carried out on JB04 core sediments taken from the Ross sea and land shelf. Combined with the analysis of sediment grain size component factor, the sedimentological records of the core were studied and its paleooceanographic significance was discussed. The results show that the bottom age of JB04 core sediments is 15ka, and three environmentally sensitive grain sizes are extracted by grain size component factor analysis, which represent normal ice sea deposits, low energy marine deposits and high energy marine deposits, respectively. According to the characteristics of sediment lithofacies and sediment composition, the cores can be divided into four segments, which are mainly affected by ice sheet erosion from the bottom to the top, belonging to the ice shelf deposition of the low energy marine environment, the ice shelf front deposit of the high energy marine environment and the seasonal sea ice area deposit mainly affected by the iceberg. The sedimentary geological records of the core and its paleooceanographic study are of great significance for a comprehensive understanding of the evolution of the marine environment in the Ross Sea.
【作者單位】： 國家海洋局第一海洋研究所海洋沉積與環(huán)境地質國家海洋局重點實驗室;青島海洋科學與技術國家實驗室海洋地質過程與環(huán)境功能實驗室;國家海洋局第三海洋研究所;
【基金】：南北極環(huán)境綜合考察與評估專項(CHINARE20150102,CHINARE20150401,CHINARE20160102,CHINARE20160401) 國家自然科學基金項目(4167191,40176136,41106166,41406220)
【分類號】：P736.21

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