岩溶地区缺失原岩残余结构红色风化壳的粒度分布特征及成因指示——以贵州平坝为例

选择和使用合适的示踪指标，是揭示岩溶地区红色风化壳物质来源的关键。粒度参数在古环境研究中被大家广泛采用，但是在风化壳物源示踪方面还是新的尝试，尤其在我国。本文选择贵州中部平坝县3个下伏基岩为白云岩的缺失原岩结构的红色风化壳剖面，通过基岩酸不溶物和 剖面的粒度分析，表明红色风化壳物质对下伏基岩有很好的继承性。粒度参数随剖面深度呈规律变化，揭示了标准残积风化壳的发育特征。

PARTICLE DISTRIBUTION OF RED WEATHERING CRUST AND ITS GENETIC IMPLICATION--AS EXEMPLIFIED BY PINGBA COUNTY OF GUIZHOU, CHINA

To select and adopt the proper tracing index is the key to constrain the origin of red weathering crusts in karst areas. Particle parameters have been widely used for paleoenvironmental reconstruction, but it is a new attempt to trace the material source of weathering crust, especially in China. This paper selects three red weathering crust sections overlying dolomitite with the absence of relict parent rock structure in Pingba County, Guizhou. By analyzing particle distribution characteristics of acidic insoluble residues in bedrocks and red weathering crusts, the results show that both of them are consistent and the former is the material source of the latter. Regular variations in particle parameters with the depth in the profile indicate that the Pingba profiles are characteristic of normal residual weathering crusts.