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| SWIR Spectral Characteristics and Mineral Phase Transformations: Multi-Indicator Synergistic Response for Granite Weathering Classification |
| ZHANG Shuo1, 2, 3, LI Yu1, JIANG Tong1*, HUANG Jian-han1, HUANG Yin-wei1, 4, TIAN Jing-chun3, SHAN Mao-yu1, LI Pei-yao1 |
1. North China University of Water Resources and Electric Power, Zhengzhou 450046，China
2. State Key Loboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu University of Technology，Chengdu 610059，China
3. Institute of Sedimentary Geology，Chengdu University of Technology，Chengdu 610059，China
4. Zhejiang Huadong Geotechnical Investigation & Design Institite Co., Ltd.，Hangzhou 310030，China
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Abstract The weathering degree of granite is a critical factor governing the engineering geological characteristics and disaster risks of rock masses. However, traditional assessment methods suffer from limitations in single-dimensional parameter characterization and invasive sampling that compromises rock integrity. This study integrates chemical weathering indices and mineralogical features derived from short-wave infrared (SWIR) spectroscopy to establish a multi-dimensional, non-destructive evaluation framework for granite weathering. Taking the typical granite weathering profile in Guangde City as the research object, combined with physical and mechanical tests, X-ray fluorescence spectroscopy(XRF),and SWIR spectroscopy analysis, the co-evolution mechanism of element migration, mineral phase transition, and mechanical degradation during weathering was systematically revealed. The study reveals significant correlations between the physical-mechanical properties and chemical weathering indices of granite with varying weathering degrees. The STI index exhibits a distinct relationship with porosity. At the same time, CIA, CIX, WIC, WIG, and Rb/Sr ratios demonstrate significant linear relationships with dry density, water absorption, compressive strength, and ultrasonic wave velocity. SWIR spectral characteristics can dynamically characterize the mineral transformation sequence. The completely weathered layer exhibits absorption features dominated by montmorillonite and kaolinite,while the highly weathered layer demonstrates absorption characteristics primarily composed of montmorillonite and illite. Moderately/slightly weathered layers display similar absorption features of montmorillonite and prehnite. However, the significantly reduced absorption peak depth in slightly weathered layers, resulting from lower contents of montmorillonite and prehnite, serves as a diagnostic characteristic for identifying moderately/slightly weathered layers.The spectral absorption characteristics of minerals, including peak morphology, depth, and ratio parameters, exhibit quantitative correlations with established chemical weathering indices. Spectral analysis of mineral phase transformation processes reveals that the absorption feature depths at 1 400 nm (d1 400) and 2 200 nm (d2 200) demonstrate positive correlations with clay mineral content. Furthermore, the characteristic ratios of d1 400/d1 900 and d2 200/d1 900 serve as effective indicators of clay mineral weathering intensity, with higher values corresponding to more advanced weathering stages. Compared to the Si-Ti and Rb/Sr ratios, the chemical weathering indices defined based on mobile oxides, along with absorption peak depths and their ratios, demonstrate superior performance in evaluating granite weathering intensity. The proposed quantitative classification framework, built on the synergistic response of mineral transformations and spectral signatures, provides theoretical and methodological support for rapid identification of granite weathering grades and disaster risk mitigation.
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Received: 2025-05-09
Accepted: 2025-08-20
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Corresponding Authors:
JIANG Tong
E-mail: jiangtong@ncwu.edu.cn
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