狼山东南麓台地中的粘土矿物及其对古的环境的指示意义.docxVIP

毕业论文论文题目（中文）狼山东南麓台地中的粘土矿物及其对古环境的指 示意义论文题目（外文）The southeast foot platform of the Wolf moutainss clay mineral and its instruction significance to the ancient environment狼山东南麓台地中的粘土矿物及其对古环境的指示意义摘要吉兰泰地区位于阿拉善高原东北边缘，其古环境对于理解河套地区环境演化以及阿拉善干旱荒漠高原等形成演化均有重要意义。前人的共同研究成果可以证实在6万年前吉兰泰盆地存在古湖泊，但当前发现的“吉兰泰-河套”古大湖的存在证据主要来自于吉兰泰次级凹陷、呼包凹陷以及西山咀凸起区。磴口次级隆起区处于吉兰泰盆地的内部，能够敏感指示古大湖湖面的升降变化，然而目前尚未发现湖泊发育的证据，本文对位于磴口次级隆起区边缘的狼山山前开展研究工作，寻找湖相沉积地层证据，并采集相关样品。根据粘土矿物沉积记录，包括粘土矿物的含量、种类组合以及伊利石的结晶度大小来看，吉兰泰盆地整体处于干冷状态，结合沉积相证据表明，该区极易形成盐湖。关键词：吉兰泰；吉兰泰次级凹陷；磴口次级隆起区；粘土矿物；伊利石结晶度The southeast foot platform of the Wolf moutainss clay mineral and its instruction significance to the ancient environmentAbstractJilantai region is located in the northeast edge of la shan plateau. Its ancient environment has important significance to understand the hetao area environment evolution and la shan arid desert plateau’s evolution. Predecessors research achievements has confirmed the jilantai basin is a ancient lakes 60000 years ago, but most of the current jilantai - hetao ancient lake founded evidence of comes from the jilantai’s secondary sag, the hubao sag and the raised xishan tsui area. The dengkou’s secondary uplift is in the interior of jilantai. It is sensitive to indicate the rise or fall of the ancient lake lake change, but no one has found evidence of the development of lake in this paper. The Wolf mountains is along the edge of the dengkou’s secondary uplift. We went there to look for the lake facies sedimentary strata evidence and collect the related samples. According to the clay mineral deposit records, including the content of clay mineral, type and size of illite crystallinity, jilantai basin is in the dry state in entirety. And combined with evidence of sedimentary facies, There is easy to form a salt.第一章 绪论吉兰泰地区位于阿拉善高原东北边缘，构造上属于河套断陷盆地的一部分，现代属于温带荒漠区。气候干旱，降雨稀少，不仅受西风环流作用，还受到季风作用的影响。因此，吉兰泰盆地古环境对于理解河套地区环境演化以及阿拉善干旱荒漠高原等形成演化有重要意义。陈发虎等（2008）通过野外地质考察、观察探坑剖面以及分析遥感影像，在吉兰泰盐湖周围发现4道高湖面古湖堤岸残留的地质地貌证据，结合湖相沉积剖面资料以及光释光测年的结果认为在