(1. Key Laboratory of Engineering Geomechanics，Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029，China；2. Graduate University of Chinese Academy of Sciences，Beijing 100049；3. Key Laboratory of Mineral Resources，Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029，China)
Abstract：Through studying of weathering of two rhyolite light stands built in 1520 AD in Confucius Temple of Quzhou，Zhejiang province，their weathering rates in moist environment are elicited (0.4–9.7 mm/(100 a))，and the differences between light stands，different parts of one light stand，and the same part in different aspects are also discovered. For examples，(1) The weathering rates of the top disks in north aspect of No.1 and No.2 light stands are 4.3 and 9.7 mm/(100 a)，which are larger than these in south aspect(datum mark and 2.1 mm/(100 a)). But that are quite different in the bottom，the weathering rates in southwest aspect of light stand No.1 and in south aspect of No.2 are the largest in the bottom，which are 3.1 and 2.1 mm/(100 a)，respectively. Such differences are caused by the microenvironment like wind，rainfall，solar radiation and so on. (2) Compared with other part of the light stands，the weathering rates of candle holes in top disks are the smallest，which are no more than 1.0 mm/(100 a)，because they are isolated from air for always filled with water (mostly are rainfall). From the above，a basic idea is proposed to obstruct factors that influenced weathering for long-term protection of the light stands.
