黄土中 微斜长石／石英、方解石／石英 及其古环境的意义

The ratios of IM/IQ (microcline/quartz) and IC/IQ (calcite/quartz) were determined by means of an infrared spectrophotometer for loess and paleosol in the Brunhes normal polarity zone in Loehuan, Shaauxi Province. On the basis of the determined values,loesses in the Lochuan section can be divided into three types in accordance with their formation mechanisms: weakly weathered soil-formation, moderately weathered soilformation and strongly weathered soil-formatian, and paleosols in the Brown series can be divided into black loam, carbonate brown earth, brown earth, leached earth and darkbrown earth. The least square evaluation of IM/IQ and IC/IQ ratios indicates a linear positive correlation between them. The ratios of IM/IQ and IC/IQ decreased with the development of weathering soil.formation and pedogenesis during the accumulation of loess. Our study shows that these ratios can be used as an effective indicator of loess- and paleospl.formation environments.