干旱区生态环境知识资源中心(Arid): 天山北麓典型黄土地球化学特征研究

Arid

	天山北麓典型黄土地球化学特征研究
其他题名	Geochemistry characteristics of loess deposits at northern foot of Tianshan Mountains
	刘现彬 1; 赵爽 2; 温仰磊 2; 柳加波 2; 李冠华 2; 贾佳 2; 夏敦胜 2
来源期刊	干旱区地理
ISSN	1000-6060
出版年	2014
卷号	37 期号:5 页码:883-891
中文摘要	选择天山北麓地区典型风成黄土钟梁剖面进行常量元素地球化学特征研究。结果表明：天山北麓黄土与黄土高原黄土、伊犁黄土具有相似的常量元素组成，但风化程度明显偏低。在化学风化偏弱的内陆干旱表生环境中，黄土剖面Na元素的活动性强于Ca。进一步分析发现，由于研究区碳酸盐的淋溶淀积作用不明显，Rb/Sr等一些在黄土高原地区能较好指示古气候变化的代用指标并不能很好指示天山北麓黄土成壤强度；但不受物源和沉积环境差异影响的化学蚀变指数CIA能够较好的反映天山北麓黄土成壤强度，可作为在西北内陆干旱区古环境重建的气候代用指标。
英文摘要	The continental loess-paleosol sequences of Loess in China have recorded the past climate and environment change of East Asia since Miocene. The loess on the northern pediment of the Tianshan Mountains is one important part of wind-blown deposits in the northwest of China and provides a good opportunity for studying the pa-leoenvironment variation in arid central Asia. The magnetic susceptibility of the loess has been widely used to probe the past climate change owing to its good correlation with marine oxygen isotope proxy. However, it is argumentative to use magnetic susceptibility as paleoclimate proxy in all areas for magnetic susceptibility is the comprehensive reflection of types, content and particle size of magnetic minerals, and influenced by the provenance, climate conditions of deposition area and other factors. A series of magnetic investigation of loess in recent years shows that the magnetic susceptibility enhancement model of the loess in the northwest of China is significantly different from the Loess Plateau,although we are not clear about the mechanism. So the research of magnetic properties of the loess and paleoclimate change in the northwest of China need to be re-examined by other parameters such as geochemistry ,grain size characteristics. Most geochemistry investigation of loess in the northwest of China focused on Ili basin which is warmer and wetter than other places. So we carried out geochemistry investigations on the loess/paleosol sequence on the northern pediment of the Tianshan Mountains with few studies previously. Results show that : compared with the Loess Plateau,it shows a similar macroelement component but a significantly weaker chemical weathering intensity. Study on the geochemistry of loess on the Loess Plateau and lower reaches Changjiang River indicates migration ability of CaO is stronger than that of Na20. However, CaO plays a weaker mobility than Na20 in Zhongliang profile,indicating Na has stronger migration ability than Ca in arid inland environment. Due to weak leaching of carbonate,the proxy Rb/Sr ratio which is able to reflect weathering intensity of the loess in the Loess Plateau have a poor corresponding relation with the strata in the Tianshan Mountains region. The chemical index of alteration (CIA) can reflect the weathering intensity and the strength of pedogenesis of the loess of interior arid area, which exempt from impact of differences of provenance and depositional environment.
中文关键词	天山 ; 黄土 ; 地球化学 ; 成壤强度
英文关键词	Tianshan Mountains loess geochemistry pedogenesis
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOLOGY
WOS研究方向	Geology
CSCD记录号	CSCD:5273339
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/2XILL650/231130
作者单位	1.兰州大学, 西部环境教育部重点实验室;;河口海岸学国家重点实验室, 兰州, 甘肃 730000, 中国; 2.兰州大学, 西部环境教育部重点实验室, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	刘现彬,赵爽,温仰磊,等. 天山北麓典型黄土地球化学特征研究[J]. 兰州大学,2014,37(5):883-891.
APA	刘现彬.,赵爽.,温仰磊.,柳加波.,李冠华.,...&夏敦胜.(2014).天山北麓典型黄土地球化学特征研究.干旱区地理,37(5),883-891.
MLA	刘现彬,et al."天山北麓典型黄土地球化学特征研究".干旱区地理 37.5(2014):883-891.