干旱区生态环境知识资源中心(Arid): 兰州市夏秋季大气降尘矿物组成特征及环境意义解析

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	兰州市夏秋季大气降尘矿物组成特征及环境意义解析
其他题名	Interpretation of the environmental significance based on the minerals in Lanzhou dustfalls
	陈超勤; 张静雅; 梁懿文; 程明明; 张成君
来源期刊	兰州大学学报. 自然科学版
ISSN	0455-2059
出版年	2019
卷号	55 期号:3 页码:326-332
中文摘要	通过对兰州市区5-10月7个采样点以及兰州大学榆中校区1个采样点大气降尘收集,利用全样X-衍射测定降尘中矿物组成,解析兰州市大气降尘的来源及对大气环境的影响.结果显示,兰州市大气降尘中矿物组成主要由w (石英)40.2%、w (长石)13.9%、w (方解石)11.6%、w (白云石)6.8%、w (伊利石)6.4%、w (绿泥石)3.6%、w (高岭石)5.2%、w (伊利石/蒙脱石混层)5.5%、w (石膏)3.9%、w(黄铁矿)2.9%和少量角闪石等矿物组成.分析结果与中国黄土-古土壤中矿物组成类型相似,说明黄土高原和西部沙漠是兰州市大气降尘的主要源区.大气降尘中不均匀分布的高w(方解石)、w(白云石)、w(石膏)和w(黄铁矿)等指示了降水、温度对源区的矿物有明显的风化改造作用,尤其是人类活动对矿物源及改造有重大关系.说明兰州市降尘的来源不仅有大量的外源,而且有经过改造以及人类活动加入的混合源作为二次降尘源,且二次或多次扬尘是市区大气颗粒物的主要来源.石膏和黄铁矿可以作为监测城市酸雨的一个指标.
英文摘要	Particles carried by the monsoon from the loess-paleosol strata can decrease the air quality in Lanzhou.Mineral components in Lanzhou dustfalls from 7 sample sites in the city and 1 sample far away from the city were analyzed,and the sources of dustfall particles understood.According to the bulk sample X-ray results,mineral components were found similar to those in the loess-paleosol strata.Minerals in Lanzhou dustfalls were made up of quartz (about 40.2%),fledspar (about 13.9%),calcite (about 11.6%),dolomite (about 6.8%),illite (about 6.4%),chlorite (about 3.6%),kaolinite (about 5.2%),illite/smectite mixed layer mineral (about 5.5%),gypsum (about 3.9%),pyrite (about 2.9%),and a little amount of hornblende,and others.The types of minerals in Lanzhou dustfalls were the same as the loesspaleosol sediments.It could be inferred that dustfalls in Lanzhou mainly came from the loess plateau and deserts in the western parts of China.But,w(calcite) and w(dolomite) were unusually high and gypsum and pyrite minerals were kept in some samples indicated that not only did dustfalls come from the loess plateau and deserts in the western China,but precipitation and high temperature in the city could rework primary particles to form new clay minerals and carbonate minerals as second or multiple dustfalls,and human activities played an important role during this process.Gypsum and pyrite minerals could be the proxy for acid rain in the city.
中文关键词	大气降尘 ; 夏秋季 ; 粘土矿物 ; 碳酸盐矿物 ; 兰州市
英文关键词	dustfall summer and falling clay mineral carbonate mineral Lanzhou
语种	中文
收录类别	CSCD
WOS类目	ENVIRONMENTAL SCIENCES
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:6663450
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/316112
作者单位	兰州大学地质科学与矿产资源学院, 甘肃省西部资源重点实验室, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	陈超勤,张静雅,梁懿文,等. 兰州市夏秋季大气降尘矿物组成特征及环境意义解析[J]. 兰州大学,2019,55(3):326-332.
APA	陈超勤,张静雅,梁懿文,程明明,&张成君.(2019).兰州市夏秋季大气降尘矿物组成特征及环境意义解析.兰州大学学报. 自然科学版,55(3),326-332.
MLA	陈超勤,et al."兰州市夏秋季大气降尘矿物组成特征及环境意义解析".兰州大学学报. 自然科学版 55.3(2019):326-332.