【摘要】 因其化学反应的活泼性和地壳分布的广泛性,铁元素的赋存状态(化学种)对断裂等诸多地质学的分支领域都具有极为重要的理论意义和实用价值。运用穆斯堡尔谱技术对青藏高原周边3条断裂带断层泥样品中的铁元素化学种的系统分析与研究发现,3条断裂中铁元素化学种的分布特征明显不同,显示铁对活断层的活动性和活动期次具有一定的指示意义。映秀-北川断裂以还原性铁占优势,显示出断层活跃并和地球深部有连通;西秦岭北缘分水岭断裂铁元素化学种分布和断层泥的颜色相对应,暗色断层泥中还原性铁占主导,亮色断层泥中氧化性铁占主导,显示出该断裂活跃、活动复杂和多期次性;剪子河断层以氧化性铁为主,显示出断层近期不活跃或者是块体内断层。更多还原

【Abstract】 The occurrence state of iron has extremely important theoretical significance and practical value in many branch fields of geology,including fault zone researches,because of its wide distribution and chemical activities.Iron species in three fault zones along the eastern and northeastern margin of the Tibetan Plateau had been analyzed by the mssbauer spectroscopy,and the results showed that distribution features of iron species in the three fault zones are significantly different,indicating the iron speciation in fault gouges is related to the activity of the fault and the action stage of the fault.Reduced iron species dominates of the Yingxiu-Beichuan fault zone,indicating the fault is active and connects to the deep Earth;the iron species associates with the color of fault gouge in the Fenshuiling fault zone of the West Qinling,dark fault gouge is dominated by reduced iron,bright fault gouge is dominated by oxidized iron,indicating the fault is active and complicated and has multiple stages;oxidized iron dominates the Jianzihe fault zone,indicating either the fault is inactive in recent or it is a block body fault.更多还原