【摘 要】
：
Observation and experimental analysis of soluble salt deposit along four profiles across the strata deposited in Nihewan paleolake basin enabled us to recognize
【机 构】
：
Department of Resources and Environmental Science,Dean's Office of Shanxi Normal University,The Cen
【基金项目】
：
the National Natural Science Foundation of China
论文部分内容阅读
Observation and experimental analysis of soluble salt deposit along four profiles across the strata deposited in Nihewan paleolake basin enabled us to recognize the nature and evolution stages of the Nihewan paleolake and its significance in stratigraphical division and paleo-environmental reconstruction. The Nihewan paleolake was at least a weak-saline to semi-saline lake and represents an intracontinental lake in the semi-arid region. The lower member of sedimentary strata in the paleolake contains gypsum layer and gypsum lamellae. Soluble salt is mainly composed of SO2-4 and Ca2+ ions, representing a trend of the paleolake evolving into a stage of sulfate lake. The upper member of the strata has predominantly Cl-, K+, and Na+ ions in soluble salt, indicating a starting development of the paleolake to chlorite lake, but no salt rock was deposited, indicating a drying trend of the area.
其他文献
旅游业转型升级是河南省经济发展的客观要求，是旅游业增强竞争力的必然选择。针对河南省旅游业转型升级中面临的问题和矛盾，文章从市场、企业、产品、产业等方面对河南省旅游业
随着现代信息技术的不断发展，电子银行成为现代金融业的发展趋势。电子银行的出现给传统银行业务既带来了机遇，也构成了挑战。应对这种挑战就需要传统银行构建新型的电子银行营
通过信用担保解决中小型民营企业融资难问题，是目前国内外普遍采取的有效措施。由于中小企业经营规模小，实力弱，因而融资风险大，而中小企业又没有相应的担保体系为其进行融资担保
上市公司在国民经济中占有重要的地位，上市己经成为我国企业发展的一种趋势。上市公司的融资问题与上市公司的生存和发展存在着紧密的联系，所以高效融资是企业长期健康发展的基
二十世纪九十年代以来，供应链管理已成为增强企业核心竞争力的重要方法之一，而在供应链体系下研究企业资金流的计划协调控制是极为必要的。应收账款融资作为一种重要的供应链融
创业板市场作为中小企业利用证券市场进行股权融资的场所，能够为风险投资提供退出渠道，优化资源配置，有利于我国多层次资本市场结构体系的构建。我国创业板于2009年设立，近年来不
危险源辩识是为了明确所有可能产生或诱发风险的危害因素,文章对其预先控制进行了阐述.
福建泉州外国语中学经过高中新课程实验,逐步摸索出五大策略:组织管理:做中学研,循规创新;教学创新:以生为本,"三为三化";校本培训:立足课堂,多方拓展;学分认定:化繁为简,化
Since the discovery that selenium is an integral component of the active site of the mammalian glu-tathione peroxidase, four members of the glutathione peroxida
A preliminary study on the speciation of rare earth elements in plant cells has been carried out by molecular activation analysis (MAA). Mesophyll protoplasts o