塔里木盆地侏罗-白垩纪古气候研究     

万超  李双应  王松  杨栋栋  刘毅  何刚  徐锦龙 《安徽地质》2010,20(1):25-29

以沉积学理论为指导,结合岩石学和矿物学等学科,通过对塔里木盆地岩相和重矿物类型和组合及其稳定性等的分析,详细探讨了塔里木盆地侏罗纪—白垩纪的岩相特征,并重建古气候的演化特征。塔里木盆地侏罗纪主要属于温暖湿润气候,晚侏罗纪后期到早白垩世属于干旱炎热气候。  相似文献   

Corrigendum to “Climate change since 11.5 ka on the Diancang Massif on the southeastern margin of the Tibetan Plateau” [Quaternary Research 73 (2010) 304–312]     

Jianqiang Yang  Wei Zhang  Zhijiu Cui  Chaolu Yi  Yixin Chen  Xiangke Xu 《Quaternary Research》2010,73(3):588

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正态分布检验在地下水检测质量控制中的应用   总被引：5，自引：3，他引：2  

李松  饶竹  黄毅  贾静 《岩矿测试》2010,29(5):585-589

对地下水调查中37种必测组分检测过程的替代物进行筛选,应用D’Agostino法对替代物的测量结果进行正态性检验。利用正态分布函数"3σ"原则,定义了各替代物质量控制指标的有效区间。应用正态函数随机变量的数学期望和方差,计算得到各替代物有效区间内的正态函数分布概率均大于97%,替代物过程能力指数计算结果表明,二溴氟代甲烷、甲苯-d8、对溴氟苯、1,2-二氯苯-d4、氟苯等挥发性有机污染物分析过程选用的替代物质量控制过程处于稳定的监控状态;2,4,5,6-四氯间二甲苯、二丁基氯菌酸酯、p-三联苯、十氯联苯等半挥发性有机污染物分析过程选用的替代物监控指标分析过程能力不足。建议参考美国EPA方法中有关监控指标质量控制区间的要求,适当放宽对半挥发性有机物检测流程中选用的替代物质量控制区间的有效范围。正态分布在地下水检测过程质量控制中的应用,为实验室检测过程的质量管理提供了科学、有效的数学依据。  相似文献   

加标回收在水质分析中的应用及回收率计算方法   总被引：3，自引：1，他引：2  

李义  禹海清  董建芳  梁志宏 《岩矿测试》2010,29(5):597-600

阐述了水质分析中加标回收分析的方法步骤、条件控制及计算方法。当加标体积影响试样在加标水样中的浓度时,直接使用回收率理论计算公式的计算值,均较其真实的回收率偏低,且其偏低值随加标体积的增加而增大。根据加标回收分析的定义,分别以加标前后被测组分质量浓度(mg/L)的变化或含量(μg)的变化为依据,导出两个计算加标回收率的实用公式。采用该公式,加标体积可以不受严格控制,其计算结果与真实的回收率一致,适用于日常水质分析工作。  相似文献   

Investigation of the sulfur speciation during chalcopyrite leaching by moderate thermophile Sulfobacillus thermosulfidooxidans     

Jin-lan Xia  Yi Yang  Huan He  Chang-li Liang  Xiao-juan Zhao  Lei Zheng  Chen-yan Ma  Yi-dong Zhao  Zhen-yuan Nie  Guan-zhou Qiu 《International Journal of Mineral Processing》2010,94(1-2):52-57

The surface sulfur speciation of chalcopyrite leached by moderately thermophilic Sulfobacillus thermosulfidooxidans was investigated by employing scanning electron microscopy (SEM), X-ray diffraction (XRD) and sulfur K-edge X-ray absorption near edge structure spectroscopy (XANES), accompanying with the leaching behavior elucidation. Leaching experiment showed that there was an optimum range of the redox potential for chalcopyrite dissolution. Leaching products were found accumulating during the leaching process, which might be jarosite according to the XRD analysis. The sulfur K-edge spectra indicated that chalcocite might be the intermediate sulfur compound under a critical redox potential, which might explain the existence of optimum range of the redox potential and provide an evidence for the two-step leaching model of chalcopyrite at low Eh. In addition, the results of sulfur K-edge spectra showed jarosite would accumulate on mineral surface, which might be the main component of the passivation layer.  相似文献   

Mineralogical and geochemical investigations of the Dajia Salento-type bauxite deposits,western Guangxi,China     

Xuefei Liu  Qingfei Wang  Jun Deng  Qizuan Zhang  Silei Sun  Jianyin Meng 《Journal of Geochemical Exploration》2010

The Dajia Salento-type bauxite deposit in western Guangxi is hosted within the Quaternary ferrallitic soil profile, and it formed via breaking up, weathering and oxidizing of Permian bauxite orebodies occurring as a semi-continuous layer in the upper Permian. Mineralogical analyses reveal that diaspore, hematite and kaolinite are the major minerals in bauxite ores with small amounts of anatase, chamosite, gibbsite, goethite, illite, zircon, quartz and pyrite. The ore texture and mineral assemblage reveal that the depositional/diagenetic environment of the Dajia bauxite was much close to phreatic environment. Both the ore texture and the morphology of zircon grains also indicate that most of the bauxitic soils were transported a short distance. Diaspore is suggested to be non-metamorphic in origin and mainly formed in a reducing condition of diagenetic environment, while kaolinite is the product of the in situ epigenetic replacement of alumina in diaspore by dissolved silica. Geochemical analyses indicate that Al₂O₃, Fe₂O₃, SiO₂ and TiO₂ are the main components of the bauxite ores and trace elements such as Zr, Hf, Nb, Ta, Th and U were enriched during the bauxitization process. Simultaneously, Zr vs. Hf and Nb vs. Ta show a high correlation. Geochemical indices such as Zr/Hf, Nb/Ta and Eu/Eu* (among others) denote that the magmatic rocks related to the Emeishan plume in western Guangxi and the carbonates in the underlying Maokou Formation provided the main sources of material for the bauxite ores.  相似文献   

GIS-based distributed technique for assessing economic loss from flood damage: pre-feasibility study for the Anyang Stream Basin in Korea   总被引：4，自引：4，他引：0  

Choong-Sung Yi  Jin-Hee Lee  Myung-Pil Shim 《Natural Hazards》2010,55(2):251-272

Large national budgets are required for flood damage reduction projects, making it critical to ensure that public money used therein be spent efficiently. Accordingly, reliable assessment of flood damage is a critical issue in analysis of the economic aspects of flood damage reduction projects. To this end, this study aims to provide a GIS (geographical information system)-based technique for distributed flood damage assessment. We consider two aspects of flood damage assessment from an engineering and economic perspective, i.e. flood inundation analysis and multi-dimensional flood damage analysis (MD-FDA). To perform this assessment, we used a GIS-based framework and data processing method to assess damages. The proposed methodology was applied to flood control channel projects for flood disaster prevention in the Anyang Stream Basin in Korea and presents detailed GIS data processing and assessment results. Findings from this study may contribute to the improvement of usability of MD-FDA and may provide research directions for integrating economic and engineering factors. This distributed technique will also assist in the decision-making process when evaluating the economic feasibility of flood damage reduction projects for structural and non-structural measures.  相似文献   

鄂尔多斯盆地晚三叠世延长组长6期湖盆坡折带特征及其地质意义     

傅强  李益 《沉积学报》2010,28(2):294-298

鄂尔多斯盆地晚三叠世湖盆西南缘及东北缘发育典型坳陷型湖盆坡折带。研究表明,在北东缘具有多级缓坡坡折带特征,坡度1°~3°,宽度15~25 km;西南缘具有单一陡坡坡折带特征,坡度3°~5°,宽度10~20 km。由于受湖盆收缩原因影响,坡折带平面展布局部会发生变化。与此同时,坡折带在对地层的超覆叠置、岩性纵向组合以及沉积体的纵横向展布上均具有重要的控制作用。以坡折带特征研究为基础,建立坡折带控制非构造圈闭展布模式,对于指导鄂尔多斯盆地晚三叠世地层的油气勘探具有重要意义。  相似文献   

黑龙江省中西部地球排气与地震活动的探讨   总被引：5，自引：1，他引：4  

邵济安  赵谊  张福松  陆永发 《岩石学报》2010,26(12):3651-3656

本文根据近两年来在黑龙江省中西部沿断裂带逸出的H2、CO、H2S等还原性气体组合,结合C、H、S、He、Ar同位素研究,讨论了还原性气体组合的深源特征。在此基础上以安达地震为例,作者阐明了以氢气为首的还原性气体逸出与深部构造背景及其与地震的关系。深源还原性气体的逸出孕育着地壳不稳定的因素,有诱发地震和其他自然灾害的可能。地球排气作用与地震作用关系的研究在类似黑龙江省中西部大面积被第四系覆盖的地区是地震预报较为有效的手段。  相似文献   

利用自然γ能谱测井资料确定粘土矿物的含量及其应用     

刘菁华  王祝文  易清平 《吉林大学学报(地球科学版)》2010,40(1):215-221

根据粘土矿物含量的图版计算方法,计算了实际井段的粘土矿物含量,分析了高岭石、伊利石和蒙脱石与U、Th、K含量的相关关系,由此分析得到粘土矿物含量与放射性元素含量的多元线性关系,建立了粘土矿物含量计算的回归方程。通过对不同井段以及同一井段不同地层数据建立的回归方程分析,给出了具有代表性的线性回归方程模型。根据一个实际井段粘土矿物的计算,获得粘土矿物含量随深度的变化,其粘土矿物含量计算结果与原测井解释相吻合,同时与岩心分析误差在10%左右。  相似文献