A2O·3MoO3·3H2O(A＝Na、K)晶须的合成与表征

在常温条件下合成了两种钾、钠的钼酸盐晶须 ,用FT -IR和XRD对其结构进行了分析 ,SEM照片清晰表明这两种化合物为针状晶须。     

Sand harm in Taklimakan Desert highway and sand control

Reputed as a wonderful achievement of the world's highway construction history, the Taklimakan Desert highway is now facing serious sand drift encroachment problems due to its 447- km-long passage of sand sea consisting of crescent dunes, barchan chains, compound transverse dune ridges and complex megadunes. To solve some technical problems in the protection of the highway from sand drift encroachment, desert experts have been conducting the theoretical and applied studies on sand movement laws; causes, severities and time-space differentiation of sand drift damages; and control ways including mechanical, chemical and biological measures. In this paper the authors give an overall summary on the research contents and recent progress in the control of sand drift damages in China and hold that the theoretical research results and practices in the prevention of sand drift encroachment on the cross-desert highway represent a breakthrough and has an epoch-making significance. Since the construction of protective forest along the cross-desert highway requires large amount of ground water, what will be its environmental consequence and whether it can effectively halt sand drift encroachment on the highway forever are the questions to be studied urgently.     

Microbial production of CO2 in red soil in Stone Forest National Park

Lunan stone forest is a kind of typical karst in China, which is mainly developed under red soil. In the winter of 1999, three study sites were chosen in stone forest national park according to vegetation cover, geomorphologic location and soil types. CO2 concentration was measured with Gastec pump at different depths of soil (20, 40, 60 cm) and at the same time soil samples were gathered and soil properties such as soil moisture, pH, soil organic content were analyzed and the total number of viable microbes were counted in laboratory. In the study, dependent variable was chosen as the mean soil log (PCO2), and soil properties were chosen as the independent variables. Multiple stepwise regression analysis showed that the total amount of microbes and soil moisture are the best indicators of the CO2 production, with the equation LOG(PCO2) = - 0.039(TNM) - 0.056(Mo) + 1.215 accounting for 86% of the variation of the soil CO2 concentration, where TNM is the total number of microbes in the soil and Mo is the moisture of soil sample.     

金山金矿热液蚀变粘土矿物特征及水-岩反应环境研究

粘土矿物是流体作用过程中水—岩反应的产物，因此其特征反映了流体活动的特征和水-岩反应的环境。金山金矿蚀变粘土矿物主要由伊利石和绿泥石组成，其中，蚀变糜棱岩中的伊利石含量大于绿泥石含量；而蚀变超糜棱岩中的绿泥石含量大于伊利石含量。蚀变糜棱岩中伊利石的多型为2M1，超糜棱岩中为2M1和1M。金山金矿蚀变绿泥石的成份分析结果表明其为富铁绿泥石，由蠕绿泥石、铁镁绿泥石和密绿泥石组成，绿泥石中Fe、Mg质组分不仅来自围岩，而且也有一部分来自流体。利用地质温度计计算绿泥石的形成温度为206-258℃，流体的f(O2)为10^29.56～10^-31.48。本文认为金山金矿热液蚀变为酸性蚀变，其环境为还原环境，流体作用的水／岩比较高；在水—岩反应过程中，流体中的Fe、Mg、Si为带出组分。粘土矿物的形成机制为溶解—迁移—沉淀。     

高密度电阻率法二维成像方法及其应用

高密度电阻率法在工程勘察和环境监测中是一种很重要的勘探手段，高密度电阻率法二维成像理论与方法的研究在理论和实际应用上都有着很重要的意义。随着地球物理反演和成像技术研究的兴起和发展，层析成像技术在高密度电阻率法中的应用，提高了高密度电阻率法的勘探质量和精度。本文献电阻率法层析成像技术的前提条件及高密度电阻率法二维成像理论与方法进行了粗浅探讨，最后给出了一些应用实例。     

多右端非对称位移方程组的GMRES种子投影方法

考虑用GMRES方法求解多右端非对称位移方程组(A-σjI)x^(j)=b^(j)，1≤j≤p。基于Smith的求解多右端方程组的种子投影思想，提出了求解上述位移方程组的GMRES种子投影方法，利用种子方程组产生的Krylov子空间来求近似解。本文给出了近似解的误差界，最后数值结果显示了该方法的有效性。     

安徽铜陵地区蚀变流体填图方法的探讨

蚀变流体填图是一项区域流体地质调查研究工作 ,也是一项具有战略意义的、综合性的基础地质研究工作。区域大面积的流体填图工作的理论依据、思路方法、填图要素、技术要求和规范等还没有一套成熟的方法体系。在实施中国地质调查局和国土资源部科学技术司的“铜陵地区蚀变流体填图”项目中 ,探讨了流体填图的理论依据、思路方法、研究内容和填图要素 ,对填图单位制定了 3级填图单元等级体制 ,即流体系统流体子系统流体单元。在铜陵地区划分出 4个流体系统 ,7个流体子系统和 18个流体单元。     

~(40)Ar/~(39)Ar Dating of Deformation Events and Reconstruction of Exhumation of Ultrahigh-Pressure Metamorphic Rocks in Donghai, East China

Recent investigations reveal that the ultrahigh-pressure metamorphic (UHPM) rocks in the Donghai region of East China underwent ductile and transitional ductile-brittle structural events during their exhumation. The earlier ductile deformation took place under the condition of amphibolite facies and the later transitional ductile-brittle deformation under the condition of greenschist facies. The hanging walls moved southeastward during both of these two events. The 40Ar/39Ar dating of muscovites from muscovite-plagioclase schists in the Haizhou phosphorous mine, which are structurally overlain by UHPM rocks, yields a plateau age of 218.0±2.9 Ma and isochron age of 219.8Ma, indicating that the earlier event of the ampibolite-facies deformation probably took place about 220 Ma ago. The 40Ar/39Ar dating of oriented amphiboles parallel to the movement direction of the hanging wall on a decollement plane yields a plateau age of 213.1±0.3 Ma and isochron age of 213.4±4.1 Ma, probably representing the age o     

SHRIMP Age and Geochemistry of the Bikou Volcanic Terrane: Implications for Neoproterozoic Tectonics on the Northern Margin of the Yangtze Craton

The Bikou volcanic terrane is predominated by subalkaline tholeiitic lavas. Rock samples display lower initial ratios of Sr and Nd, 0.701248-0.704413 and 0.511080-0.512341 respectively. 207Pb and 208Pb are significantly enriched in the lavas. Most samples have positive εNd, which indicates that the magma was derived from EM-type mantle source, while a few samples with negative εNd indicate that there was contamination in the magma evolution. Magma differentiation is demonstrated by variations of LREE and LILE from depletion to enrichment. Additionally, normalized REE patterns and trace elements showed that lavas from the Bikou volcanic terrane have similar characteristics to those of basalts in arc settings caused by subduction and collision. Analyses showed that the Bikou volcanic terrane is a volcanic arc. New evidence proved that the Hengdan Group, north of the Bikou arc, is a turbidite terrane filling a forearc basin. Consequently, the Bikou volcanic terrane and the Hengdan turbidite terrane const     

地铁基坑支护方案的模糊评价

根据地匠深基坑支护工程的特点，建立支护方案的指标体系，运用层次分析法确定了指标的权重，采用模糊数学的方法，构造了单极模糊评价模型，将指标因素的不确定性进行定量化。实例分析表明，模糊综合评价进行深基坑支护方案优选的方法是可行的、有效的。