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On the genesis of granite pits on top of the shigujian peak of the dayangshan mountain in Jinyun County,Zhejiang Province

引用

Journal of Geographical Sciences 2009年第2期19卷 239-248页

作者：朱诚崔之久李中轩高洁王立新邬祥林郑朝贵沈庆凡郑献章 School of Geographic and Oceanographic Sciences Nanjing UniversityNanjing 210093China School of Environment Peking UniversityBeijing 100871China Zhejiang Institute of Geological Investigation Xiaoshan 311203Zhejiang China Department of Geography Chuzhou CollegeChuzhou 239012Anhui China The People's Government of Jinyun County Jinyun 321400ZhejiangChina Meteorological Bureau of Jinyun County Jinyun 321400 ZhejiangChina

On top of shigujian peak(1477 m a.s.l.) of the dayangshan mountain in Jinyun County, Zhejiang Province, large amounts of granite pits with diameters ranging from several dozens of centimeters to around one meter and depth from 10 cm to 45 cm are found on rock *** pits mainly appear on the NE and SE sides, and their drainage mouths are in the same *** identification results through micropolariscope and X-ray fluorescence spectrometer reveal that bedrock of pits is from middle to fine-grained moyite being apt to be weathered and *** dayangshan region the annual mean temperature is 9.2℃ and annual precipitation is over 1700 *** the one hand, there always experiences a period of periglacial action with temperature oscillating near 0℃ for 4 months, i.e., from December to March next *** a consequence, the freezing-thawing cycles may be remarkable to disintegrate the *** the other hand, the windward slope of shigujian peak meets typhoon of over force 10 on the Beaufort scale in summer, therefore, the blowing makes suspending sands or pebbles grind in swirling *** on field investigation and periglacial geomorphic theory, the pits on top of shigujian peak are attributed to freez-ing-thawing of periglacial ***, storm and strong wind accelerate the *** shows that both the actions are still undergoing and variant directions of wind are the main cause for making different shapes of the *** the top of shigujian is 1500 m lower than the present snow line, some scholars considered that"glacial pothole"formed in the Quaternary is hard to work, even though in the Last Glacial Maximum(LGM).

关键词： the shigujian peak in dayangshan mountain genesis of granite pits wind-water erosion freez- ing-thawing weathering

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