岩溶地区红土与碳酸盐岩上覆地层相关性及其指示意义——以贵阳乌当区剖面为例

本文以贵阳乌当剖面为研究对象,通过对岩石、土壤的矿物学、地球化学指标的分析,探讨该地红土与基岩(桐梓组白云岩)以及上覆地层(红花园组灰岩和湄潭组下段碎屑岩)之间的物源关系。结果显示碳酸盐岩酸不溶物以石英为主,红土与碎屑岩具有相似矿物组合特征;主量元素、微量元素证据显示湄潭组碎屑岩、红花园组灰岩和桐梓组白云岩酸不溶物都为红土的形成提供了物源,其中可能以湄潭组碎屑岩贡献最大。     

Long-Term Observation of Asian Dust in Changchun and Kagoshima

Monitoring of Asian dust at two stations in Changchun, Jilin Province in northeast China, and Kagoshima, southwest Japan, is discussed. In Changchun, interval records were made with digital and video cameras from 18 March 2003. In Kagoshima, a web camera system to monitor volcanic clouds has been working since December 2000, which also provides data for studies of dust. A heavy dust episode on 11 November 2002, affecting both stations, was detected using 11 and 12 μm channels of NOAA/AVHRR. We observed dust in Changchun on 26 March, 7, 14–16 April, 1–2, 8, 10, 19 May, 8, 23 June, and 12 July in 2003. The observed images corresponded well to NOAA/AVHRR imagery and with 8.6, 11 and 12 μm Terra/MODIS results, although conditions were too cloudy for satellite verification in some cases.