玄武岩发育土壤的磁化率及其机理解析

应用矿物磁测技术和Ｘ－射线衍分析对浙江和云南武岩发育土壤的磁化率机理进行了研究。浙江玄武岩发育土壤的ｘ为１００×１０＾－８￣５００×１０６－８ｍ＾３／ｋｇ，云南玄武岩发育土壤的ｘ在５００×１０＾－８￣２０００×１０＾－８ｍ＾３／ｋｇ，合成针铁矿的ｘ为３１．９×１０＾－８ｍ＾３／ｋｇ，赤铁矿ｘ为８４．５×１０＾－８ｍ＾３／ｋｇ，且合成氧化铁的ｘ随氧化铁的铝替代量增大而增加，土壤的磁一参数和Ｘ－射线衍

MAGNETIC SUSCEPTIBILITY OF SOILS DERIVED FROM BASALT AND ITS MECHANISM

The mechanism of magnetic susceptibility (χ) of soil derived from basalt in Zhejiang and Yunnan Provinces was studied by applying mineral magnetic measurement technique and X-ray powder diffraction. Results showed that χ of soil derived from basalt in Zhejiang Province ranged from 100×10^-8-500×10^-8m³/kg. χ of soils derived from basalt in Yunnan Province ranged from 500×10^-8-2000×10^-8 m³/kg. χ of synthesized goethite and hematite were 31.9×10^-8m³/kg and 84.5×10^-8m³ /kg, respectively. χ of synthesized iron oxides increased as aluminum-substituted amount of iron oxide increased. The magnetic parameter and X-ray powder diffraction pattern of soils indicated that χ of soil derived from basalt in Yunnan Province mainly contributed to the superparamagnetic maghemite and magnetite, which is pedogenic origin. χ of soils derived basalt in Zhejiang Province came from the contributions of both primary magnetic grains and secondary magnetic minerals, and hematite.