风化作用对普通球粒陨石物理性质的影响

Weathering Effects on Physical Property of Ordinary Chondrites

陨石的物理性质在陨石母体的演化过程中起到了重要作用。地球上的风化作用也会对陨石的一些物理性质造成显著影响。为了探讨风化对普通球粒陨石物理性质的影响,本文以库姆塔格普通球粒陨石为研究对象,使用密度仪、磁化率仪、热导仪、分光光度计等测量了其不同部位的物质性质,如颗粒密度,体积密度、孔隙度、磁化率、热导率、反射光谱强度等。研究结果表明:H型普通球粒陨石的颗粒密度、孔隙度、磁化率以及反射光谱强度会随着风化程度的加深而降低,而热导率和体密度受风化作用的影响相对较小。

Physical properties played important roles during evolutionary processes of meteorite parent bodies. Some physical properties of meteorite might be significantly altered due to terrestrial weathering. In order to investigate the influence of weathering on ordinary chondrite physical properties, the physical properties（grain density, bulk density, porosity, magnetic susceptibility, thermal conductivity, and reflectance spectrum） of different depth of a Kumtag meteorite were measured using density analyzer, kappameter, thermal conductivity analyzer and spectral photometer, respectivly. The results show that the grain density, porosity, magnetic susceptibility and reflection spectrum of H ordinary chondrite decrease with increasing weathering degree. While the effect on thermal conductivity and bulk density by weathering is not significant.