Metallogenic focus-area and superlarge mineral deposits in the bordering zones between China,Russia and Mongolia

A correlative study of geology and metallogenic process in the bordering zones between China, Russia and Mongolia shows that the region of the western slope of the Da Hingan Mts. -Eastern Transbaikalia-Eastern Mongolia is a metallogenic focus-area associated with Late Mesozoic intraplate tectono-magmatic activation. During the period of 160–120 Ma a great number of multiplex deposits with similar genesis including large and superlarge mineral deposits were formed.

     

吐哈盆地西南部砂岩型铀矿含矿岩系地层时代与层序地层特征

近几年的区调和普查工作证实,吐哈盆地西南部具有良好的砂岩型轴矿成矿前景,为查明砂岩型铀矿含矿岩系所属地层的时代归属,对其所含孢粉化石进行了鉴定与研究,结果表明为双束松粉属Ｐｉｎｕｓｐｏｌｌｗｎｙｔｅｓ－云杉粉属Ｐｉｃｅａｅｐｏｌｌｅｎｙｔｅｓ－冠翼粉属Ｃａｌｌｙａｌａｓｐｏｒｙｔｅｓ组合,对应层位为下侏罗统八道湾组,反映温湿气候下的沉积产物。应用层序地层学的原理和方法,根据大量的钻孔岩芯和测井资料     

高速铁路CPⅢ网平差起算点兼容性研究

起算点的兼容性直接影响约束平差成果的质量,CPⅢ测量工作中要联测大量的已知点,区段搭接时要以重叠区段的部分上段成果作为约束点,因此,对起算点进行兼容性分析是十分重要和必要的.文中提出适用于CPⅢ网的平差起算点兼容性检验方法和兼容性较差起算数据探测方法,并在理论分析的基础上通过实测数据,计算分析并验证这些方法的合理性与科学性.     

Spitzer IRS low-resolution spectra for four candidate Seyfert 1-like objects from ULIRGs in the Sloan Digital Sky Survey, 2dF Galaxy Redshift Survey and 6dF Galaxy Survey

In this paper we present the Spitzer IRS low-resolution observation for four candidates of Seyfert 1-like objects of ULIRGs from the SDSS-2dF-6dF sample. It is found that they are all real Seyfert 1-like objects because their infrared spectra are similar to that for Seyfert 1 source indicative of AGN nature, i.e. their spectra all show high-ionization lines of [NeV] at 14.32 μm and/or [SIV] at 10.51 μm in the mid-infrared. On the other hand, it is found that they also show PAH features at 6.2, 7.7, 8.6 and 11.25 μm indicative of star formation activity. In addition, it is found that they all show the silicate feature in absorption around 10 μm indicative of heavily material obscured these sources. Furthermore, some correlations among the far infrared colors, the line ratios, the equivalent widths (EWs) of PAH feature and the Silicate strengths are also discussed for these sources.     

波浪式拖管法铺设海底管道力学性能研究

海底管道铺设是海洋油气资源开发的重要环节,传统的拖管法不能很好地适应海洋深度和复杂环境的变化。针对 Acergy公司在Girassol项目中提出的一种波浪式拖管方法,对其应用于2.0 km 长海底管道铺设进行分析。首先,结合深水海洋环境特征,采用集中质量法建立管道拖航数值模型,并介绍管道、拖缆和浮筒力学计算及水动力荷载计算方法;其次,基于非线性有限元OrcaFlex软件对拖管过程建模,以模拟实际项目拖管过程;然后,通过对比相同条件下的单波式和双波式两种拖管方式,探讨管道和拖缆的动态力学性能变化;最后,针对不同浮重比、拖航速度、拖缆长度和悬垂角、海流流速和流向角等因素展开敏感性分析。结果表明：波浪式拖管法可以有效地降低施工时对拖缆的张力需求,但也会因此增加管道局部弯矩和应力响应;相对于单波式拖管,双波式拖管在缓解由于拖航速度等变化而产生的管道局部损伤效应上更有优势,并能较好地适应不同水深环境;复杂的海流工况对拖航时管道的力学性能影响十分显著,施工前应选择合适的铺设窗口期以防止管道产生损伤。     

胶东玲南-水旺庄巨型金矿床三维地质特征及断裂控矿规律

胶东玲珑金矿田是著名的玲珑式石英脉型金矿产地,近年深部找矿发现了资源量超过600 t的蚀变岩型巨型金矿床,深入研究金矿床的三维空间特征,有助于指导该区进一步的深部找矿。利用375个钻孔资料建立了玲南-水旺庄巨型金矿床三维地质模型,分析了金矿床的三维空间特征和主要矿体的空间分布规律。矿床由3个主矿体组成,矿体沿招平断裂北段的九曲蒋家断裂和破头青断裂主裂面下盘分布。赋矿断裂沿走向呈舒缓波状,沿倾向由浅到深由陡变缓且呈阶梯状。矿体厚度的三维分布沿走向和倾向均呈现厚—薄相间变化,矿体品位与厚度相关系数为0.192,矿体品位×厚度的三维分布构成了4处矿化富集区。分析表明,断裂表面坡度变化较大区域易于矿体富集,且矿体主要富集在坡度较缓部位。由此认为,断裂倾角变化是金矿化富集的关键因素,深部找矿应注重对断裂倾角变化的研究和探测。     

Upscaling equivalent hydrofacies simulation based on borehole data generalization and transition probability geostatistics

The heterogeneity of hydrofacies is represented as spatial variability on different scales, and it has a significant impact on the behavior of groundwater flow and pollutant transport. However, effectively characterizing hydrofacies heterogeneity on different scales remains one of the most challenging problems in hydrogeology. In this study, an upscaling hydrofacies simulation (UHS) framework is proposed by integrating the upscaling borehole generalization (UBG) approach and transition probability geostatistics (TPG). A new UBG approach for generating virtual boreholes with equivalent hydrofacies information based on relatively high-density borehole lithological data is proposed, and the TPG is used to delineate the multiscale facies distribution. The results show that the UBG approach can significantly reduce borehole data volume while retaining the key equivalent hydrofacies information on a coarser scale. The UHS method can well characterize the overall distribution of equivalent hydrofacies on coarser scales, with the minor-component hydrofacies underestimated and the major-component hydrofacies overestimated to a lesser extent, and more equivalent facies appearing in strong heterogeneous areas. These results demonstrate that the UHS method can provide valuable capacity insights and advantages in characterizing hydrofacies heterogeneity on different scales using such high-density borehole lithological data.

     

北斗地基增强下的天津市三维测绘基准体系检测和评估

为了提供统一的空间地理信息数据基准框架和满足高精度、实时、动态需要,天津市建立了基于北斗地基增强系统的三维测绘基准体系。本文对该系统进行了功能、性能和似大地水准面精化模型正确性等方面的检测,结果表明其各项功能指标、性能指标、精度指标均达到了设计及规范要求,满足了建立高精度统一基准框架的需要,能够实时向用户提供米级的导航服务以及提供厘米级精密定位服务。