Chromaticity Characteristics And Environmental Significance Of The Plinthitic Red Earth

Jinhua-Quzhou Basin in Zhejiang province, basins thick quaternary ancient clay widely distributed, the researchers for the clay to environmental change research provides an ideal place.This paper choose the region as the research place, will the wide distribution of the reticulate red clay for the study of carrier to discuss the chromaticity characteristic and forming environment. Plinthitic Red Earth is widespread in southern China, with its soil layer distribution of colors such as red, yellow, white and white for the remarkable feature of the quaternary geological body. Therefore.this paper will use the CIELAB color table system respectively on the whole sample and the red and white chequered colorimetric analysis. Luodian(LD), Pujiangtangloudian(PJ-TLD), Jiangtang(JT), Xietang(XT), Tangxilishuidui(TX-LSD), Qijian(QJ-1) in the region, such as selecting a total of six section and by interval sampling, such as10cm samples were collected all samples of136and the dark and light color part of the separation, the share of136light color samples and136dark samples, and took a number of homogeneous clay, bedrock and yellow brown soil for comparison. Tested all the samples in lab, granularity, free iron content and the shade of the magnetic susceptibility and other indicators, mainly according to the analysis of characteristics of the shade of the reticulate red clay and combined with particle size, free iron, and magnetic susceptibility index, to explore the formation of the reticulate red clay environment.The preliminary conclusion is as follows:(1) Plinthitic red earth because of special structure and special color expression system, mainly including the whole sample, red checkered, white checker and the red and white chequered several chromaticity color difference.All sample chromaticity (mixed chroma) will be affected by the interference of random sampling process, test results for red light stripes material and matrix matching relationship and have no stability.Red checkered chromaticity, white checkered chromaticity only expressed the chroma of the reticulate red clay section material.Calculating the color difference is a kind of new chroma expression.(2) All sample chromaticity (mixed chromaticity) overall can reveal checkered change trend of the variation of intensity, but the details have no stability. TX-LSD, LD, JT, six section of chromaticity consistently show that all samples, red degree value (a*) and yellow degree (b*) overall consistent trends and, in contrast to the trend of brightness values (L*), namely, a*, b*value is higher, the lower L*value. Red yellow degree is high value and low brightness matching interval of checkered development more typical. In addition, a*value and Fe2O3, Al2O3, SiO2/R2O3content has good correlation, the higher the a*value, Fe2O3, AI2O3content and the higher the free iron content in the soil, the smaller the ratio of SiO2/R2O3(desilication rich aluminum and iron mineralization degree is higher), and can better instructions in clay grain composition and the change of the secondary components of clay content, which can instructs the reticulate red clay soil strength; L*value can reflect the ARM/1T,, L*value is higher, the lower ARM/IT, magnetite and maghemite particles size, the more coarse; a*, b*value can also be1T(SIRM), a*, b*value is lower,1T(SIRM) is higher, the ferrous magnetic mineral.(3) Red checkered chromaticity and white checkered chromaticity only expressed the chroma of the reticulate red clay section material. Still red checkered chromaticity can well indicate the extent and its change, white chequered chromaticity can well indicate the level checker in profile change trend. TX-LSD,LD,JT, compared to six section red checkered color have different characteristics, main performance for certain interval a*and b*change trend of inconsistencies, preliminary speculation related to hematite and goethite content is different. For water, into goethite, hematite lessened degree of red, yellow degree. Therefore, red checkered chromaticity system in the ebb and flow of a*and b*relationship can indirectly indicates the change of soil moisture conditions. At the same time, the red base in L*value and negatively correlated with%value, L*value is lower,x value is higher, indicating more hot and humid environment; b*value indicating1T(SIRM) values of high and low, b*value is lower,1T(SIRM) value is higher, the more contains the ferrous magnetic mineral.(4) Color difference (â–³E) is a kind of new chroma expression. Compared with other color expression, its can represent the trend of development strength, also can reveal the checker development stage, more environmental implications. TX-LSD, LD, JT, six sections change characteristics consistent color, the color difference, the greater the reticulate structure more clear; The color difference value is smaller, reticulate structure is more vague. The process of color difference from large to small instructions and the process of development change from strong to weak.(5) Chromaticity characteristic has good environmental significance, indicating the reticulate red clay is formed in a relatively hot and humid environment, and the fluctuations of the chromaticity parameters change and reflects the reticulate red clay is not in the process of formation has been a hot and humid environment, but in the process of its development through one or more of the dry-wet alternate phase.