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A Study on the Spatial Distribution Pattern of Metal Elements in the Soil in the Side Chamber of Western Han Tomb M25 in Fengqiyuan, Shaanxi Province

CHEN Gangquan1,2,3 YU Zongren2,3 LI Na2,3 SU Bomin2,3 ZHAO Xichen4 DING Yan4(1.School of Civil Engineering and Mechanics,Lanzhou University,Lanzhou,Gansu 730000;2.National Research Center for Conservation of Ancient Wall Paintings,Dunhuang,Gansu 736200;3.Key Laboratory for Conservation of Ancient Wall Paintings and Earthen Sites of Gansu Province,Dunhuang,Gansu 7362004;4.Shaanxi Provincial Institute of Archaeology,Xi'an,Shaanxi 710054)  
The cemetery of Zhang Anshi refers to a group of large tombs of a princely level.In order to understand the spatial distribution pattern of metal elements in the soil where metal cultural relics were once kept,this paper studies the side chamber of Tomb M25 by collecting its ground soil and analyzing it with ICP-MS and portable X-ray Fluorescence.As the research results indicate,the transmigration of metal elements in soil caused by corrosion is confined to a limited extent.As the distance from the bronze relics to the ground level increases,the Cu and Pb concentrations exponentially decrease,creating a corrosion range of 7 cm.The vertical corrosion range of metal elements is 2 cm,while the horizontal corrosion range of the iron relics is between 3 and 5 cm.The result from the ICP-MS analysis is consistent with that from the Xray Fluorescence.This indicates that,as for the indicative metal elements,X-ray Fluorescence can be used to provide information for the buried cultural relics in the archaeological sites.
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