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| The Contribution of Lithological Characteristics to Danxia Landform Genesis in Jianglang Mountain, Zhejiang Province |
| L Wen1, ZHU Cheng1, PENG Hua2, YU Jin-biao1, LI Zhong-xuan1, ZHANG Guang-sheng1, OUYANG Jie1, ZHOU Ri-liang3, ZHU Guang-yao4, LI Lan1, ZHU Qing1 |
1. College of Geography and Marine Science, Nanjing University, Nanjing 210093, China;
2. Department of Geography, Sun Yat-sen University, Guangzhou 510275, China;
3. Zhejiang Construction Bureau, Hangzhou 310027, China;
4. Department of Humanities and Social Sciences, Bengbu College, Bengbu, 233050 Anhui, China |
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Abstract Quantitive lithological study is significant for analyzing the genesis of Danxia Landform.Polariscope thin section and X-fluorescence spectroscopy analyses results indicates that volcanic gravel and rock clastic are major components of Fangyan Formation(K1f),and that SiO2 content is commonly as high as 55.7%～75.8%.The volcanic gravels are very hard and highly inert because of their experience of high temperature activities,like quenching course and because of the peculiar dolerite space-grained structure,plagioclase and dark minerals form hard rock body.The average CaO content of stones in caves is about 6.07%,which is three times higher than those of cliffs.Rock cements in caves are mainly calcite,accounting for more than 50%.Carbon dioxide from air dissolved into the infiltrating water to form ions like CO32- and HCO3-,which can dissolve calcite component and can modify the stability of stone's structure.Thereby,stones crash and dilapidation phenomenon happens.These processes result in some caves like Huixianyan Cave,Tiangongdong Cave,Jingxinshishi Cave and Zhonggudong Cave.
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Received: 13 July 2009
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