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研究区位于云南东川拱王山山顶的落雪,海拔高度在3600m左右。山顶面为一缓丘及丘间溶蚀洼地构成的第三纪残留夷平面。在夷平面上发育了碳酸盐岩的黄色风化壳。本文基于风化壳的地球化学、物理化学及矿物学等特征,重点研究了风化环境对风化壳发育特征的影响,以及风化壳与第三纪残留夷平面的关系。所研究的风化壳剖面发育于低温、降水充沛和湿润的气候条件下。分析测试结果表明,风化壳仍处于CaO、MgO淋失,SiO2富积阶段,是一种弱度风化的富SiO2风化壳。风化壳的特征表明其形成于第三纪夷平面解体之后,而不能代表第三纪夷平面的原有相关堆积。
The study area is located in Yunnan Dongchuan Gongwang mountain peak snow, altitude of 3600m or so. The top of the mountain is a Tertiary residual razor surface composed of a gentle hill and an inter-mural erosion depressions. Carbonated yellow weathered crust was developed on the flat surface. Based on the characteristics of weathering crust geochemistry, physical chemistry and mineralogy, this paper focuses on the influence of weathering environment on the developmental characteristics of weathering crust and the relationship between weathering crust and Tertiary residual razor surface. The studied weathering crust profiles are developed at low temperatures, abundant rainfall and humid climates. The analysis and test results show that the weathered crust is still in the CaO, MgO leaching, SiO2 enrichment stage, is a weak degree of weathered rich SiO2 weathering crust. The weathered crust is characterized by its formation after the disintegration of the Tertiary Plains and not the original relative accumulation of the Tertiary Plains.