极地研究2017，Vol.29Issue(1)：23-32,10.DOI:10.13679/j.jdyj.2017.1.023
南极普里兹湾沉积物稀土元素地球化学特征
GEOCHEMICAL CHARACTERISTICS OF RARE EARTH ELEMENTS IN THE SEDIMENTS OF PRYDZ BAY, ANTARCTICA
摘要
Abstract
Based on three short sediment cores collected in Prydz Bay (Antarctica) during the 29th Chinese Na-tional Antarctic Research Expedition, the rare earth element (REE) contents, sediment grain sizes, and bio-genic proxies were determined to discuss the pattern and controlling factors of the REE distribution. The results showed that the REEs of Prydz Bay sediments vary in content but have similar shale-normalized dis-tribution patterns, i.e., rich in light REEs, to upper continental crust and metamorphic rocks from Zhongshan Station, indicating they have the same terrigenous provenance. Based on the sediment grain size, major ele-ments, and biosourced proxies, it is suggested that sediment provenance is the major controlling factor behind REE composition. Moreover, biological action might dilute the REE concentration, making the grain-size ef-fect invalid. The REE proxies in the sediment profile were almost stable with depth, reflecting similar terri-genous inputs and depositional environments on the century scale. In addition, theδCe values generally de-creased downward, suggesting a gradual decreasing trend in oxidability within the sediment core.关键词
普里兹湾/南极/沉积物/稀土元素/地球化学Key words
Prydz Bay/Antarctica/sediment/REEs/geochemistry引用本文复制引用
李国刚,季有俊,李云海,冷启暖,布如源,李薏新..南极普里兹湾沉积物稀土元素地球化学特征[J].极地研究,2017,29(1):23-32,10.基金项目
南北极环境综合考察与评估专项(CHINARE2015-01-02-07, CHINARE2015-01-02-02)资助 （CHINARE2015-01-02-07, CHINARE2015-01-02-02）
