The Upper Permian strata in Qujiang-Renhua area, Guangdeng Province, is a coalbearing sequence. Based on sedimentary faeies analysis and corelation of chemical variation in sedimentary rocks, the following regularitie...The Upper Permian strata in Qujiang-Renhua area, Guangdeng Province, is a coalbearing sequence. Based on sedimentary faeies analysis and corelation of chemical variation in sedimentary rocks, the following regularities can be notieed: (1) The evolution of continental facies→transitional facies→marine facies is reflected by the deereasing tendency of K, Ga, Ti and the inerease in Mg, Ca, and Sr; (2) K, Ga, and Ti exhibit a tendency of decrease and Ca, Mg, V, and Sr tend to increase in the sequence of lacustrine faeies→laterlal facies→gulf and lagoonal facies. (3) Lacustrine facies→lagoonal facies→gulf facies is paralled by decrease in K, Cu, Pb, V, and Ba as well as an increase in Ca, Mg and Mn in sideritie redules. (4) Discussions arc also made in the paper on the differences between drill core samples and surface samples, between pyrite, siderite and ealc-siliceous nodules, and between light and heavy minerals separated from sandstone in respect bo their components (Tables 2, 3, 4, 5).展开更多
On 20 March, 2002, a super dust storm attacked Beijing, which was stronger than any dust storm ever recorded. The con-centration of total suspended particulates (TSP) reached 10.9 mg·m-3, 54 times as high as the ...On 20 March, 2002, a super dust storm attacked Beijing, which was stronger than any dust storm ever recorded. The con-centration of total suspended particulates (TSP) reached 10.9 mg·m-3, 54 times as high as the national air quality standard. The concentrations of major crustal elements, such as Ca, AI, Fe, Na, Mg and Ti, were 30-58 times higher than those in non-dust storm days. The concentrations of pollution elements, such as Zn, Cu, Pb, As, Cd and S, were also about several or even nearly ten times higher than those in normal days. The enrichment factors of Pb, As, Cd and S in PM2.5 were as high as 12.7, 29.6, 43.5,28.4, indicating that these pollutants came from the mixing of mineral aerosol with pollution aerosol emitted by pollution sources on the way of dust storm’s long-range transport. The overlap of invaded air mass from dust with pollution air mass from Beijing local area was another reason for the enhancement of pollutants. During dust storm, fine particles (PM2.5) accounted for 30% of TSP and pollutants in PM2.5 accounted for even as high as 45%-69% of TSP. The increase of pollutants after dust storm proved further that mineral aerosol, especially the fine particles from dust storm favored the transformation and accumulation of pollutants. It must be noted that Fe (II) was detected again in this dust storm, which provided new evidence for the mechanism of coupling and feedback between iron and sulfur in the atmosphere and the ocean. The increase of both pollutants and nutrient, Fe(Ⅱ), during dust storm illuminated that dust storm is an important factor affecting the global environment change.展开更多
文摘The Upper Permian strata in Qujiang-Renhua area, Guangdeng Province, is a coalbearing sequence. Based on sedimentary faeies analysis and corelation of chemical variation in sedimentary rocks, the following regularities can be notieed: (1) The evolution of continental facies→transitional facies→marine facies is reflected by the deereasing tendency of K, Ga, Ti and the inerease in Mg, Ca, and Sr; (2) K, Ga, and Ti exhibit a tendency of decrease and Ca, Mg, V, and Sr tend to increase in the sequence of lacustrine faeies→laterlal facies→gulf and lagoonal facies. (3) Lacustrine facies→lagoonal facies→gulf facies is paralled by decrease in K, Cu, Pb, V, and Ba as well as an increase in Ca, Mg and Mn in sideritie redules. (4) Discussions arc also made in the paper on the differences between drill core samples and surface samples, between pyrite, siderite and ealc-siliceous nodules, and between light and heavy minerals separated from sandstone in respect bo their components (Tables 2, 3, 4, 5).
文摘On 20 March, 2002, a super dust storm attacked Beijing, which was stronger than any dust storm ever recorded. The con-centration of total suspended particulates (TSP) reached 10.9 mg·m-3, 54 times as high as the national air quality standard. The concentrations of major crustal elements, such as Ca, AI, Fe, Na, Mg and Ti, were 30-58 times higher than those in non-dust storm days. The concentrations of pollution elements, such as Zn, Cu, Pb, As, Cd and S, were also about several or even nearly ten times higher than those in normal days. The enrichment factors of Pb, As, Cd and S in PM2.5 were as high as 12.7, 29.6, 43.5,28.4, indicating that these pollutants came from the mixing of mineral aerosol with pollution aerosol emitted by pollution sources on the way of dust storm’s long-range transport. The overlap of invaded air mass from dust with pollution air mass from Beijing local area was another reason for the enhancement of pollutants. During dust storm, fine particles (PM2.5) accounted for 30% of TSP and pollutants in PM2.5 accounted for even as high as 45%-69% of TSP. The increase of pollutants after dust storm proved further that mineral aerosol, especially the fine particles from dust storm favored the transformation and accumulation of pollutants. It must be noted that Fe (II) was detected again in this dust storm, which provided new evidence for the mechanism of coupling and feedback between iron and sulfur in the atmosphere and the ocean. The increase of both pollutants and nutrient, Fe(Ⅱ), during dust storm illuminated that dust storm is an important factor affecting the global environment change.
