Experimental Studies on Partial Melting of Massive Samples of Granite

As a basis of modern petrology,the equilibrium relations describing the melting of granite were established mainly on melting experiments of Powder samples.Such experiments,however,have serious limitations in providing information about the variations in compositional and fabric features of the minerals and in the composition and distribution of the melt.Our experiments using massive samples indicate that melt occure mainly at the quartz-plagioclase and quartz-potash feldspar boundaries and the composition of the melt is dependent on local characteristics in the melting system,showing no correlation with the bulk composition of the rock samples.At lower temperatures(740-760℃,0.2GPa),the melt plots at or near the eutectic point in Q-Ab-Or-An-H2O diagram,indicating equilibrium melting.At higher temperatures(790-800℃，0.2GPa)the melt becomes lower in SiO2 and higher in Na2O,deviating makedly from the eutectic line but without disappearance of any mineral phase,suggesting a non-equilibrium process.It is obvious that the phase-equilibrium relations in natural massive granites may be greatly different from those deduced from powder experiments.     

张广才岭新华屯岩体的形成时代与成因研究

全岩－矿物的锶同位素研究结果表明,出露在张广才岭花岗岩带上的新华屯岩体属中侏罗世晚期的产物,其同位素年龄为１６０～１６５Ｍａ,表明该晶洞花岗岩体不属于印支期。地球化学研究结果显示,该岩体属于长英质“Ｉ”分异型,并在岩体就位和岩浆结晶过程中存在少量地壳物质的混染,但控制岩体成分变化的主要因素仍是矿物的结晶分异作用。年轻的钕同位素模式年龄表明该区存在新元古—显生宙的地壳增生。     

Hausdorff局部凸线性拓扑空间集值系统的解

在Hausdorff局部凸线性拓扑空间中讨论集值系统x∈F(x，y)，y∈G(x，y)解的存在性，推广了Rzepechi B在一致凸Banach空间中相应的结论。     

原子吸收光谱仪用于沉积物中锡分析的方法研究

１９９４－１９９６年间,利用原子吸收光谱仪,对沉积物中有机锡和总锡的石墨炉原子吸收分析方法进行了优化,探讨了分析过程中的仪器条件和改进剂类型。优化后方法的检出限为 ２．４５μｇ／Ｌ（ＴＰＴ－锡）,特征浓度（相当于产生 １％净吸收或 ０．００４ ４吸光度的待测元素浓度）为４８２μｇ／Ｌ（ＴＰＴ－锡）。在这一条件下,采用盐酸酸化－正己烷萃取－氢氧化钠回洗－硝酸氧化的预处理方法,可以使沉积物样品中三苯基氯化锡（Ｔｒｉｐｈｅｎｙｌｔｉｎ, ＴＰＴ）的检出限达到４１ｎｇ／ｇ（ＴＰＴ－锡）,回收率为 １０６％。应用这一方法对野外模拟实验和黄岛电厂出水口的沉积物样品进行了分析,结果表明,这一方法能够满足对沉积物样品中锡进行分析的要求。     

Hydroelastic Response of A Circular Plate in Waves on A Two-Layer Fluid of Finite Depth

The hydroelastic response of a circular, very large floating structure (VLFS), idealized as a floating circular elastic thin plate, is investigated for the case of time-harmonic incident waves of the surface and interfacial wave modes, of a given wave frequency, on a two-layer fluid of finite and constant depth. In linear potential-flow theory, with the aid of angular eigenfunction expansions, the diffraction potentials can be expressed by the Bessel functions. A system of simultaneous equations is derived by matching the velocity and the pressure between the open-water and the plate-covered regions, while incorporating the edge conditions of the plate. Then the complex nested series are simplified by utilizing the orthogonality of the vertical eigenfunctions in the open-water region. Numerical computations are presented to investigate the effects of different physical quantities, such as the thickness of the plate, Young’s modulus, the ratios of the densities and of the layer depths, on the dispersion relations of the flexural-gravity waves for the two-layer fluid. Rapid convergence of the method is observed, but is slower at higher wave frequency. At high frequency, it is found that there is some energy transferred from the interfacial mode to the surface mode.     

浅析侯马市大张家山一带金矿地质特征

本文通过对大张家山工作区内地层、构造、岩浆岩、矿体特征的分析,认为矿体主要产于构造破碎带中,受构造破碎带控制。矿体形态比较规则,呈似层状、脉状、透镜状。通过成矿规律分析,认为矿产成因类型属于中低温热液金属硫化物碳酸盐石英脉型金矿。     

Σ-Δ型模数转换器应用于强震数据采集系统

利用32位微处理器控制Σ-Δ型模数转换器ADS1248,实现了MEMS加速度传感器输出电压信号的模数转换,采集到的地震信号满足强震数据采集要求。     

基于结构方程模型的广州城市社区居民出行行为

基于行为主义的视角,从微观的社区层面研究城市居民的出行行为。选取广州市的3 个城 市社区作为案例,以218 个样本数据库为基础,根据研究的侧重点不同分别建立两个结构方程模 型,拟合各变量之间的路径关系。其中居民出行选择的结构方程模型重点分析居民属性、居住 区位与居民出行目的、出行时间、出行方式等出行偏好之间的关系。居民出行决策的结构方程 模型则模拟居民的出行决策过程。结果显示：居民之间由于自身属性不同在出行选择和出行偏 好上存在差异,居民出行行为中居民属性和居住区位是根本,出行目的是关键,居民出行行为可 以概括为“属性决定目的,目的影响行动”。此外,居民的出行行为有其复杂的作用机制和决策 路径,居民的出行决策过程可以解读为性别决策子系统、年龄决策子系统、收入决策子系统和居 住区位决策子系统等4 个决策子系统,各子系统中路径作用的不同使居民属性和居住区位对居 民出行决策产生多重多向的效应,在复合系统的影响下城市社区居民表现出差异化的出行 行为。     

地壳岩石的失水熔融实验

以岩石粉末试样的熔融实验为基础的 Ｑ Ａｂ Ｏｒ Ａｎ Ｈ２ Ｏ 体系的相关系表明,地壳岩石的熔融作用遵循矿物相消失所制约的固 液相平衡规律。然而,地壳岩石块状样品开放体系的熔融作用,其熔融机制、矿物相转变、初熔液相成分、残余固相等方面,均与地壳岩石封闭体系的熔融作用有很大差别。石英闪长岩开放体系的熔融实验表明,岩石的熔融首先从含水矿物的脱水熔融开始,从而熔体成分由基性逐渐转变为中酸性,残余固相趋于超酸性。这一实验结果对大陆地区岩浆起源和深部地壳物质组成的研究可能有新的启示。