Digital Geological Mapping of Sinus Iridum Area of the Moon Based on the Chang’E-I Data

Based on the CCD images,IIM data and DEM data of China＇s lunar exploration project （Chang＇E-Ⅰ） and related processed and analytic results,an integrated study of regional geology of Sinus Iridum and its adjacent area was conducted,and a series of relevant researches and analyses were carried out,including analysis of impact craters and their extrusive and accumulative materials,division of stratigraphic and tectonic units and classification of rock types,integrated analysis of chronology and lunar evolution history.In consideration of crater＇s shape features,quantity and preserving status of filling materials,the lunar impact craters can be divided into 7 types and 11 subtypes,and the accumulative materials of craters are divided into 6 types and 9 accumulative groups.According to the content and distribution of TiO2 and image characteristics,the basalts are divided into high-TiO2,medium-TiO2 and low-TiO2 basalts.Discussion was made on division of tectonic units and evolution features in the study area.The geological map of the Sinus Iridum Quadrangle （LQ-4） at a scale of 1∶2.5 M was preliminarily compiled with the ArcGIS system,and the spatial database of the map was established.Related technical specification,procedure and method for lunar geological mapping have been worked out,so as to lay a foundation for the forthcoming geological mapping of the global Moon in China by using the data of Chang＇E-Ⅱ and also for comprehensive study and geological mapping of other celestial bodies in the future.     

First period analyses of five neglected Algol-type eclipsing binaries: TT And, V342 Aql, RW Cap, BZ Cas and TW Lac

We present the first study of the orbital period variations of five neglected Algol-type eclipsing binaries TT And, V342 Aql, RW Cap, BZ Cas and TW Lac, using their O–C diagrams gathered from all available times of eclipse minima. These O–C diagrams indicate that short term periodic variations superimposed on secular period increases as expected in mass transferring Algols. However, due to short time coverage of the data, the secular period increase is not clear in the case of BZ Cas and V342 Aql. The secular period increase is interpreted in terms of the combined effect of mass transfer between the components of the system and the mass loss by a stellar wind from the system. The mass transfer rates from the less massive secondary components to the more massive primaries for non-conservative cases would be about 10⁻⁷M/yr and 10⁻⁸M/yr for RW Cap and V342 Aql, respectively, and 10⁻⁹M/yr for TT And and TW Lac. Therefore, the Algol systems RW Cap and V342 Aql have the largest mass transfer rate, which could be in Case AB type, while those of the Algol systems TT And and TW Lac display the slow mass transfer rate and they could be in Case B type. The sinusoidal forms of the orbital period variations of all five Algol systems can be due to either by the light-time effects due to unseen components in these systems, or by the cyclic magnetic activity effects of the cool secondary components. The possible third bodies in all five Algol binaries would have masses larger than one solar mass. If these hypothetical large massive third bodies were normal stars, they should be detectable. Therefore, new photometric and spectroscopic observations of these systems and careful analyses of those data are required. Otherwise, the cyclic magnetic activity effects of the secondary components could be the basis of a working hypothesis in explaining the cyclic period variations of these systems.     

金川铜镍硫化物矿床Ⅰ、Ⅱ矿区矿体地质对比研究

文章从宏观和微观两个方面对金川铜镍硫化物矿床Ⅰ、Ⅱ矿区矿体地质进行了对比,认为两矿区在矿体地质特征方面存在明显差异,反映出含矿岩体有可能为来自同源,但不是同一通道的产物,从而对探讨整个金川矿田含矿超基性岩体的形成与空间展布规律及未来找矿工作具有重要指导意义。     

松科1井南孔白垩系青山口组一段沉积序列精细描述:岩石地层、沉积相与旋回地层

中国白垩纪大陆科学钻探松科1井南孔连续取青山口组一段岩心81.41m,收获率为100%。青一段沉积时期应与土仑阶对应。通过对松科1井南孔青一段岩心的精细描述,揭示其岩性-岩相-旋回的沉积序列及其过程。青一段识别出6种岩石类型(泥岩、白云岩、泥灰岩、重结晶灰岩、介形虫灰岩和火山灰)。相类型为深湖亚相以及白云岩沉积、泥灰岩沉积、灰岩沉积、深湖浊流沉积、火山灰沉积和深湖静水泥沉积共6种沉积微相。青一段中可识别的米级旋回(六级旋回)有4种类型,可划分出81个米级旋回。这些米级旋回叠加成25个五级旋回、6个四级旋回,识别出1个三级旋回界面。对青山口组一段暗色泥岩、白云岩、火山灰等特殊事件层的精细刻画对于松辽盆地的缺氧事件、烃源岩、湖海沟通事件研究具有重要意义。     

P-Ⅲ型和极值Ⅰ型分布曲线在最大风速计算中的应用

P-Ⅲ型和极值Ⅰ型分布曲线是国内外采用的最大风速极值计算方法。用陕西省乾县和扶风两个气象站1972-2004年10min平均最大风速资料,用P-Ⅲ型、极值I型分布曲线进行30年一遇和50年一遇自记10min平均最大风速的极值推断。分析结果表明：P-Ⅲ型、极值Ⅰ型分布曲线可根据经验散布点与理论曲线拟合程度反复调整计算参数,特别应注意小概率事件的拟合,能使理论曲线拟合满足设计部门的要求,比较好用。     

新疆尉犁县风屏北山片麻杂岩地质特征及原岩成因探讨

对风屏北山片麻杂岩进行了同位素年龄确定,采用SHR IMP放射性同位素测年,确定同位素定年结果为2 484±20 Ma。根据岩石化学、稀土、微量元素等特征,对片麻杂岩进行了分析研究,认为该片麻岩原岩为I型花岗岩,经区域变质作用形成。     

Spectral observations of the novalike star TT Ari. II

Results from a spectral study of one of the brightest cataclysmic variables, the star TT Ari, are presented. They are generally in good agreement with previous observations, but there are some differences. The luminosity of the star, as well as the equivalent widths of emission lines, reveal variations that are probably periodic in character. Emission from the star in the CIV 5801Å and 5812 Å lines is observed for the first time. The observed variations in the symmetry of the broad absorption Balmer series (beginning with Hβ) may be a consequence of the appearance of a P Cyg line profile. The Hα line manifests a P Cyg profile consisting of two components corresponding to 600 and 1900 km/s. The average of the ratio EWHα/EWHβ indicates that the formation of these lines may be explained, at least partially, in terms of a simple photoionization-recombination model. __________ Translated from Astrofizika, Vol. 51, No. 3, pp. 445–460 (August 2008).     

矿床分割法在以GIS为平台的铀资源定量估算中的应用——以双桥-新路地区为例

数量化理论Ⅰ模型规定:参与定量估算的预测要素数目小于等于研究区内已确定的典型矿床模型数目。事实上,多数研究区内可作为模型的典型铀矿床数目较少,因而限制了预测要素的选取,降低了预测精度,为解决此局限性,提出了一种新方法——矿床分割法。该方法是将某一典型铀矿床模型按其具有相似预测要素的矿带进行逆向分割,即拆分成一定数目的铀矿模型,扩充了模型数目,并保持分割后各模型区资源量不变。双桥-新路地区试验结果证明:运用"矿床分割法"后,预测要素的选取数目有了明显增加,提高了方向系数值,资源量估算值更接近模型区的实际资源量。     

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