MIAO Zhao, SHEN Junhui, LI Wengang, LI Jinbiao, CHEN Weidong, ZHU Kejun. 2014: ARGILLIZATION AND MECHANISM CHARACTERISTICS OF ALTERED-DOLERITE IN DAGANGSHAN HYDROPOWER STATION. JOURNAL OF ENGINEERING GEOLOGY, 22(1): 130-136.
    Citation: MIAO Zhao, SHEN Junhui, LI Wengang, LI Jinbiao, CHEN Weidong, ZHU Kejun. 2014: ARGILLIZATION AND MECHANISM CHARACTERISTICS OF ALTERED-DOLERITE IN DAGANGSHAN HYDROPOWER STATION. JOURNAL OF ENGINEERING GEOLOGY, 22(1): 130-136.

    ARGILLIZATION AND MECHANISM CHARACTERISTICS OF ALTERED-DOLERITE IN DAGANGSHAN HYDROPOWER STATION

    • Dolerite argillic alteration is an important geological flaw in Dagangshan hydropower station. This paper takes advantage of geological survey and laboratory experiment, combined with regional geological environment to analyze distribution, mineralogical, structural features, physical mechanics properties and formation mechanism of the altered-rock. The study reveals that the dolerite dykes along SN direction commonly develop altered argillic band. The band mainly concentrates in contact surface of the dykes and granite or internal schistosity crack. The altered-argillic rocks are loose and crumbly and have the following physical characteristics: high water content, low specific gravity, high plasticity and medium compression. Results of X ray diffraction and scanning electron microscope show that they have a lot of chlorite and pore void microstructure characteristics. Pyroxene darkly minerals enrichment, multi-period hydrothermal metasomatism and tectonic stress action constitute the formation mechanism of the dolerite argillic alteration.
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