澧阳平原杉龙岗遗址埋藏古水稻土磁性矿物特性
Soils(2017)
Abstract
为探明埋藏古水稻土磁性矿物特征,采用环境磁学方法研究了澧阳平原杉龙岗遗址埋藏古水稻土的磁性矿物含量、组成和粒度.结果表明,埋藏古水稻土的磁化率平均值为6.2×10-8m3/kg,饱和等温剩磁平均值为16338×10-5Am2/kg,软剩磁平均值为773×10-5Am2/kg,退磁参数S300平均值为72%.埋藏古水稻土亚铁磁性和不完全反铁磁性矿物含量随土层深度增加不断降低,其含量均低于现代耕作水稻土层;埋藏古水稻土磁化率主要来源于亚铁磁性矿物和不完全反铁磁性矿物,且亚铁磁性矿物占相对主导地位;相对于现代耕作水稻土层,埋藏古水稻土层中磁性矿物以较粗的磁铁矿颗粒为主.
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