青藏高原东缘3条断裂带断层泥铁元素化学种的分布特征  

Distribution Characteristics of Iron Species in Three Faults Along the Eastern Margin of the Tibetan Plateau,China

作　　者：马向贤[1,2] 王华林 张志武[4] 时丕龙[5] 赵军[1] 张海峰 宋振江 

机构地区：[1]中国科学院油气资源研究重点实验室,兰州730000 [2]中国科学院大学,北京100029 [3]山东省地震工程研究院,济南250021 [4]中国地质大学(北京)地球科学学院,北京100083 [5]中国科学院遥感与数字地球研究所,北京100094 [6]甘肃省建筑设计研究院,兰州730000

出　　处：《矿物岩石地球化学通报》2014年第3期348-354,共7页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家科技支撑计划(2012BAK19804-01);中国科学院战略性先导科技专项(B类)(XDB03020400);国家自然科学基金项目(41273112;41072213)

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。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（o）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.

关 键 词：断层泥 铁化学种 活动性 活动期次 青藏高原 

分 类 号：P595[天文地球—地球化学]