| 湖北恩施地区硒地质地球化学环境背影 |
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| 关键词:selenium distribution geological and geochemical background |
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| Selenium Geological and Geochemical Environmental Background in Enshi, Hubei |
| There are a Se_rich area and a Se_poor area in Enshi, Hubei province, China. Human selenosis and KD cases were reported in the Se_rich area and in the Se_poor area respectively. Five Se_rich rock formations exist in the Se_rich area, but selenosis cases were only found in the areas where the Upper Maokou Formation(P 1 m ) and Wujiaping Formation(P 2 w ) of the Permian system emerge. The siliceous and carbonaceous shales of Permian system have high selenium content swith an average of 247.72×10 -6 , carbon silicalite is less abundant averaging 52.4×10 -6 , and siliceous dolomite has the lowest selenium content (3.13×10 -6 ). The selenium decreasing along with the above_mentioned various rocks is directly influenced by the decreasing of their organic carbon. In the Se_poor area, purple sandstone and mudstone, which are lack of the organic carbon material collecting selenium, have a very low selenium content. The large or small exposure areas of both Se_rich and Se_poor soils,are controlled by a comperehensive result of structure, lithologic characters and slope of landform and so on. Se_rich rocks are located in either the flanks or synclinal core. If the dip angles of rock formations are smaller and consistent with slope of landform, the exposed area of the rock will be large and the Se_rich soil derived from the rock will influence widely. If the Se_rich rock formations in flanks of compression folds have steep dip angles and narrow area of outcrop, the distribution of the soil derived from the rock is controlled by the nature and intense of the transporting media and the landscope. |
| ZHANG Guang-di,GE Xiao-li,ZHANG Qi-ling,LUO Dai-hong,LIU Xin-ping,Fordyce F.M.,MAO Da-jun,SU Hong-can.1998.Selenium Geological and Geochemical Environmental Background in Enshi, Hubei[J].Acta Geoscientica Sinica,19(1):59-67. |
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