南极长城站区燕窝湖岩芯中稀土元素特征

本文通过对长城站区燕窝湖岩芯沉积物中稀土元素丰度、分布模式、特征参数和稀土元素之间以及其他元素的相关系数研究,探讨了该湖岩芯的物质来源。研究结果表明,燕窝湖岩芯沉积物中REE分布模式与菲尔德斯半岛火山岩类较相似,并与长城湾表层沉积物类同,表明它们的物质来源具有同源性。山此推论,该湖岩芯沉积物的母岩主要来自菲尔德斯半岛火山沉积碎屑岩,并保留了岛弧型的特征。同时,还表明该湖盆沉积环境系以干旱的冰川环境为主导,化学风化十分微弱。

CHARACTERISTICS OF THE REE IN YANWO LAKE CORE AT GREAT WALL STATION,ANTARCTICA

The Yanwo Lake, situated in King George Island at 62°13'14"S and 58°57'58"W, the height above sea level of drill hole is 14.5m and depth is 7. 7m. Based on the analysis of rare earth element (REE) in the sediments from the Great Wall Station.the source of sediments is discussed in this paper. The concentration, distributions of Yanwo Lake Core are dis cussed. The results of analysis show that the ∑ REE values of the sidiments of Yanwo Lake Core vary over a range of 51. 8-89. 2 ppm. with .an average of 70. 2 ppm. The small range of variation of ∑REE indicates the fine to the coarse. As viewed from the results of the analysis in different sidements Yanwo Lake Core,there is a general tendency For ∑ REE to decrease from the subclay with fine sand to the fine sand with gravel. These showed the deposition range obviously near to the erosion origin region. The glacial environment of the aridity is play a leading role. The chemical weathering us vary faint. The results of study show that the mother rock of sediments of Yanwo Lake Core are from the volcanic deduced on the Fildes Peninsula. The charateristics of island-arc is retained. The REE distribution patterns are similar to those of the sidiments on the Great Wall Bay,this shows that they have the same material source. The interrelated matrix of elements in sediments of Yanwo Lake Core is show that be tween rare earth elements are extremely clear relations; between REE and Cr、Fe、Co、Hf、 Sc、Mo、As、Sb are also extremely clear relations, and Ca、 Na、Rb、Ta、 Zr、V、 Zn are show rarious degrees of negative relative.