1 College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China
2 Key Laboratory of Karst Georesources and Environment (Guizhou University), Ministry of Education, Guiyang 550025, China
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Received
Published
Revised
2025-06-18
2026-05-08
2025-11-26
Online Date
2026-08-06
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摘要
赤水丹霞地貌区因其红层砂岩的瑰丽色彩而具有独特的景观价值,前人在其色彩的研究中已经发现,红层砂岩的颜色会随各种条件的变化而表现出多样性。但对砂岩颜色影响因素的量化问题仍存在缺漏。为了探讨赤水丹霞地貌区砂岩在各影响因素下色彩的变化规律,在色彩值的量化上采用国际照明委员会(international commission on illumination,CIE)提出的Lab色彩空间,精准测定样品的色彩值。以此为标准,基于多维控制采样策略(平面拓展-垂向分层-单因素隔离),通过X射线衍射(X-ray diffraction,XRD)矿物分析、扫描电子显微镜(scanning electron microscope,SEM)、能谱仪(energy dispersive spectrometer,EDS)微观观测及分光光度法铁价态检测,物质成分分析结果说明,赤铁矿与黏土矿物分别通过Fe3+的显色效应和吸附作用主导砂岩红色基调,Fe元素价态随深度变化而进一步改变砂岩显色特征;微观分析显示,强风化带砂岩结构松散、颗粒破碎,裂隙率较微风化带提高22.19%,Lab色彩空间的参数b提升5.91,契合砂岩表面颜色更为鲜艳的宏观特性;控制含水率或温度不变,按梯度进行单一变量实验,发现温度每升高10 ℃,b平均降低0.38,含水率通过影响Lab色彩空间的参数L来改变砂岩颜色。研究揭示了物质成分、微观结构与环境变量对红层砂岩色彩的调控规律,为丹霞地貌区生态修复材料的色彩适配提供科学依据。
Abstract
The Chishui Danxia landform in China is characterized by bright red-bed sandstone, yet the quantitative factors controlling its color diversity remain insufficiently understood. The study was aimed to investigate the mechanisms of sandstone color variation under environmental influences to support color matching in ecological restoration. A multidimensional sampling strategy, including planar-vertical isolation and single-factor control, was applied. Color parameters were measured using the CIE-Lab system. Mineral compositions were analyzed by X-ray diffraction(XRD) and scanning electron microscope-energy dispersive spectrometer(SEM-EDS), and iron speciation was determined spectrophotometrically. The results of material composition analysis indicate that hematite and clay minerals dominate the red tone of sandstone through the coloring effect and adsorption of Fe3+, respectively. The valence state of Fe element further changes the color characteristics of sandstone with depth. Microstructural analysis shows that sandstone in strongly weathered zones exhibits a looser fabric and more fractured grains. The parameter b of Lab color space has increased by 5.91 compared with weakly weathered zones, corresponding to a brighter surface appearance. A temperature increase of 10 ℃ decreases the b by 0.38, while moisture affects brightness through variations in the parameter L of Lab color space. Controlled experiments confirm these environmental effects. This study establishes a quantitative framework linking mineral composition, microstructural evolution, and environmental factors to color expression, providing a scientific basis for color-compatible restoration materials in Danxia landscapes.
CHEN Shuai, YANG Gen-lan, HUANG Fu-quan, ZHAI Mao-shuai, YANG Tao.
Coloration Characteristics of Sandstone in Chishui Danxia Landform Area Based on Material-structure-environment Interplay[J].
Science Technology and Engineering, 2026, 26(13): 5648-5657 DOI:10.12404/j.issn.1671-1815.2504557
红层分布广泛,是西南地区常见的岩土体[1]。作为红层地貌的特殊表现形式,丹霞地貌具有独特的地质景观价值。其学术研究可追溯至北魏地理学家郦道元的科学考察记录,近代研究则始于德国地质学家李希霍芬(Ferdinand von Richthofen)1870年在《中国》专著中对粤北丹霞山的地质描述,该学者首次将此类岩层命名为“Deck-Sandstein”[2]。1927年,冯景兰与朱翙声[3]系统提出“丹霞层”概念,标志着该地貌类型研究的范式转变。丹霞地貌凭借其独特的岩相组合与形态特征,不仅形成极具美学价值的自然景观,更成为区域经济发展的地质载体。以贵州北部赤水地区为例,该典型丹霞地貌区通过科学开发已构建完整的旅游产业链。然而,在景区基础设施建设过程中,一贯使用的传统混凝土喷锚支护工艺常导致人工构筑物与原生岩体产生显著视觉冲突,这凸显了对丹霞地貌区建筑材料的工程地质适配性研究的重要性。因此,如何在满足工程建设需求的同时保护丹霞地貌的自然景观,成为了一个亟待解决的课题。
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