The elemental geochemical characteristics of Late Quaternary rock core from Yanwo Lake in the Great Wall Station area， King George Island， Southwest Antarctica

This paper is manily to treat the change regularity of the contens,distributions, enrich coefficients and correlative coefficients of some trace and constant elements in the sediments of Late Quaternary rock core from Yanwo Lake in the Great Wall Station area, King George Island and to discuss the sedimentary sources in Yanwo Lake and the periodical changes of Late Quaternary climate and the environment in the area. It is concluded that the elastic sedimentary rocks, including volcanic sedimentary rocks, around Yanwo Lake are the major sources of Yanwo Lake sedimentsi the mantle material is also one of its sources and what is more, the continent-sourced materials are transported by the Antarctic glacier.

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。

西南极乔治王岛长城站区晚第四纪燕窝湖岩芯元素地球化学特征

本文阐述了乔治王岛长城站区燕窝湖沉积物中微量元素及某些常量元素的含量、分布、富集系数和相关系数的变化规律 ,探讨了该湖岩芯物质来源及气候环境的阶段性变迁 ,认为一方面燕窝湖周围碎屑沉积岩 (包括火山沉积岩 )是进入沉积体系的主要物源 ;另一方面 ,地幔物质也是其物源之一 ;同时 ,并不排除南极大陆冰进期搬运来的陆源物质进入沉积体系。

南极乔治王岛燕窝湖沉积物^(14)C-AMS测定及研究

通过加速器质谱方法，精确测定了南极燕窝湖沉积物陆生苔藓^（１４）Ｃ年龄，获得该湖区沉淀速率为０．０３－０．１１ｃｍ／ａ，并据此估算出燕窝湖沉积物是距今１３０００ａ，即末次冰期以来形成的。讨论了大气^（１４）Ｃ产生率纬度效应，以及^（１４）Ｃ分布储存库效应、环境效应、硬水效应等对极地湖泊沉积物^（１４）Ｃ测年之影响及校正。