Magnetic properties of surface soils across the southern Tarim Basin and their relationship with climate and source materialsReport as inadecuate




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Chinese Science Bulletin

, Volume 56, Issue 3, pp 290–296

First Online: 26 January 2011Received: 04 May 2010Accepted: 23 August 2010

Abstract

The magnetic susceptibility χ of surface soils on the Chinese Loess Plateau CLP has strong positive correlation with mean annual precipitation. It is widely accepted that ultrafine magnetite-maghemite grains produced during pedogenesis are responsible for the enhancement of χ, and loess χ on the CLP has been widely used as a proxy for the intensity of the East Asian summer monsoon. However, few works have investigated mechanisms for the enhancement of χ in the case of surface aeolian sediments in westerly-dominated inland China, north of the Tibetan Plateau. Here detailed rock magnetism and grain size studies of 49 surface samples taken across the southern Tarim Basin for different rainfall-temperature-altitude conditions are presented. The results show that samples taken from desert have the lowest χ values and that χ of loessic sand and loess samples decreases with increasing altitude. In addition, the rock magnetism studies suggest that the magnetic properties of surface soils across the southern Tarim Basin are mainly controlled by the concentration of coarse aeolian ferrimagnetic minerals. The contribution of ultrafine pedogenically produced magnetic grains to χ is very limited.

Keywordssurface soils magnetic susceptibility grain size Tarim Basin rock magnetism This article is published with open access at Springerlink.com

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Author: JinBo Zan - XiaoMin Fang - JunSheng Nie - ShengLi Yang - ChunHui Song - Shuang Dai

Source: https://link.springer.com/article/10.1007/s11434-010-4210-4







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