ENVIONMENTAL IMPLICATION OF THE COLOR INDEX OF THE PLINTHITIC RED EARTH IN JINHUA-QUZHOU BASIN
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摘要: 网纹红土因基质中镶嵌大量不规则浅色斑纹而具有特殊的色度表达体系。利用K-MinoltaCR-400色度仪分别测试金衢盆地JT、TX-LSD、LD等3个剖面网纹红土层的红网纹（基质）、白网纹（浅色斑纹）、全样（红、白网纹混合样品）等三类样品的色度指标（L*、a*、b*），并以红网纹为背景色，获得白网纹与红网纹的色度差（ΔE）。其结果表明：（1）网纹红土因特殊的斑纹结构而具有特殊的色度表达系统，应该包括全样色度、基质色度、斑纹色度、色差等。不同色度表达，其参数所揭示的环境信息存在差异，引起色度变化的因素也是复杂的。（2）全样色度（混合色度）总体可以揭示网纹化强弱变化的趋势，a*值越高，Fe2O3、Al2O3含量越高，SiO2/R2O3比值越小（脱硅富铝铁化程度越高），但细节上受随机取样过程干扰而不具备稳定性；（3）基质色度可以较好地指示红化程度及其变化，斑纹色度可以较好地指示网纹化程度在剖面上的变化趋势；（4）色差（ΔE）是一种新的色度表达方式，其既能表征网纹发育强弱的趋势，也能揭示网纹发育的阶段性，色差越大，网纹结构越清晰，网纹化程度越强。Abstract: The plinthitic red earth is a kind of deposit with red clay matrix decorated by a large number of irregular light-colored stripes. It needs a special color expression system. The color index of L*(lightness), a*(redness), b*(yellowness) and ΔE(color difference between the red matrix and white reticulation) of the red substrates, light-colored stripes and full sample from Jiangtang (JT) section, Tangxi (TX-LSD) section and Luodian(LD) section in Jinhua-Quzhou basin were measured respectively by K-Minolta CR-400. The results show that:(1)the plinthitic red earth needs a special color expression system due to its special stripe-structure. The system includes the colors of the bulk sample, red matrix, light-colored stripe and color difference. Different color system has specific environmental implications. The factors which caused the color variation are complicated; (2) The color of bulk sample, in general, may indicate the tendency of reticulation forming process, the higher the redness (a*), the more the content of Fe2O3、Al2O3 and the less the SiO2/R2O3 ratio (or the stronger the desilica-allitization), but the value is not stable due to random sampling; (3) The color of red matrix can well indicate the level of redness and its changes; and the color of light-colored stripe can well indicate the trend of change of plinthitic red earth in section; (4) The new color index-color difference (ΔE) can indicate the trend and phase of reticulation, the higher the color difference, the stronger the forming process of the reticulate structure. Environmental implication can be better indicated with the new system.
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Keywords:
- plinthitic red earth /
- chroma /
- environmental implication /
- Jinhua-Quzhou basin
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