陶瓷釉矿物学特征的电子自旋共振(ESR)研究

早在６０年代初,Ｇｒｉｓｃｏｎ等人［１］就曾用ＥＳＲ方法对玻璃中的顺磁离子进行了研究。８０年代初Ｃａｎａｒａ等人［２］又用ＥＳＲ方法研究了硅酸玻璃、釉熔块和陶瓷色料的波谱特征,发现发色元素Ｃｒ、Ｆｅ、Ｃｏ等在釉料中的反应行为,石田等人［３］则研究了含铁高岭土和瓷胎中氧化铁的存在状态。８０年代末蔡秀成等人［４］应用ＥＳＲ方法探讨了景德镇传统“石灰碱釉”的油（煤）窑产品发黄机理。由此可见,用ＥＳＲ方法研究铁瓷釉及瓷胎中顺磁杂质离子的存在形式,对提高陶瓷质量和呈色机理的探讨有着广阔的应用前景。１　样…     

甘孜—理塘断裂带北段玄武岩地球化学特征及构造意义

沿甘孜-理塘断裂带广泛发育有三叠纪玄武岩,该断裂带北段的玄武岩多为SiO_2大部分不饱和蚀变较强的基性岩,根据TiO_2K_2O、P_2O_5、Al_2O_3和CaO含量判定为亚碱性拉斑玄武岩系列。痕量元素特征表明,玄武岩为轻稀土弱富集型,∑REE、∑LREE/∑HREE、δEu、Eu/Sm、Sm/Nd都显示与大洋拉斑玄武岩一致。笔者认为,理塘断裂带南段在晚二叠世打开并逐步向北推进,北段于早三叠世打开,中三叠世为甘孜-理塘海发育的鼎盛时期,晚三叠世逐渐闭合。     

Simulating research on pressure distribution of floor pore water based on fluid-solid coupling

In terms of the problem that deep coal resources are under the threats of high water pressure, it is necessary to further study the outburst mechanism of working face floor karst water from the view of studying varying patterns of rock mechanical parameters and confined water pressure distribution of floor rock under the mining influence in the process of mining. Through the theoretical research of fluid-solid coupling and rock seepage experiment, the changing rule of the rock porosity and the Young’s modulus is analyzed, the changing law of the floor displacement is obtained by establishing the floor mechanic model, and the relation between elastic energy density and rock mass unit strain is established. Based on the numerical model of fluid-solid coupling analysis by the Comsol Multiphysics software, the changing law of floor displacement corresponds to the theoretical solution, the different variation laws of rock mass of different depths under the actions of ground pressure are acquired by simulation calculation, the distribution characteristics of pore water pressure are discussed, and the elastic energy density of the rock mass under the action of imbalance water pressure before and after mining is comparatively analyzed. Studies show that the distribution of pore water pressure is horizontally different before and after the stress peak line, and it mainly has four distribution patterns vertically. When mining above the confined water, the spatiotemporal position when and where the upper and lower boundaries of the rock mass in the lower water-resisting layer release energy at the same time is critical to the occurrence of water inrush.     

Postrift Rapid Subsidence Characters in Qiongdongnan Basin,South China Sea

In this article,the backstripping technique was used in studying the subsidence charac-ters of the Qiongdongnan(琼东南) basin(QDNB) in order to understand its dynamic mechanism of formation and evolution.Meanwhile,the geothermal characteristics of this area were summarized,and the stretching factors(β) of the upper crust,the whole crust,and the whole lithosphere were calculated.The QDNB is characterized by high subsidence rate,high geothermal gradient,high geothermal heat flow,and the lithosphere stretching an...     

Identifying parameters of advanced soil models using an enhanced transitional Markov chain Monte Carlo method

Acta Geotechnica - Parameter identification using Bayesian approach with Markov Chain Monte Carlo (MCMC) has been verified only for certain conventional simple constitutive models up to now. This...     

基于直升机平台的南极非量测数码航空摄影测量技术研究

使用直升机作为飞行平台并应用哈苏H1D非量测数码相机进行南极中山站和拉斯曼丘陵地区摄影测量。通过对非量测相机标定,获取相机的内方位元素,从而可进行航空摄影测量。两个区域的具体试验表明基于直升机平台和非量测数码相机的航空摄影测量可应用于南极等困难地区的地形图测绘。     

平庄盆地六家立井地区找铀目标层岩石学特征及其找矿意义

六家立井地区位于平庄盆地北缘,白垩系下统阜新组上段是该区砂岩型铀矿床目标层位,具有较好找铀前景。为深入了解该区砂体的岩石学特征,通过野外钻探工作、岩心编录、样品采集及岩矿测试方法,详细研究了目标层碎屑岩类型、碎屑岩成分、结构构造等岩石学方面特征。结果表明目标层碎屑岩成分成熟度和结构成熟度均较低,具有搬运距离短、沉积速度快的特点,其物源较单一,初步判断物源来自盆地东北部和西北部隆起带酸性花岗岩,同时也为铀成矿提供了良好的铀源。     

Deformation mechanism of strain localization in 2D numerical interface tests

Heterogeneity arises in soil subjected to interface shearing, with the strain gradually localizing into a band area. How the strain localization accumulates and develops to form the structure is crucial in explaining some significant constitutive behaviors of the soil–structural interface during shearing, for example, stress hardening, softening, and shear-dilatancy. Using DEM simulation, interface shear tests with a periodic boundary condition are performed to investigate the strain localization process in densely and loosely packed granular soils. Based on the velocity field given by grains’ translational and rotational velocities, several kinematic quantities are analyzed during the loading history to demonstrate the evolution of strain localization. Results suggest that tiny concentrations in the shear deformation have already been observed in the very early stage of the shear test. The degree of the strain localization, quantified by a proposed new indicator, α, steadily ascends during the stress-hardening regime, dramatically jumps prior to the stress peak, and stabilizes at the stress steady state. Loose specimen does not develop a steady pattern at the large strain, as the deformation pattern transforms between localized and diffused failure modes. During the stress steady state of both specimens, remarkable correlations are observed between α and the shear stress, as well as between α and the volumetric strain rate.     

Detrital Zircon Dating of Meso- and Neoproterozoic Rocks in North China and Its Implications

New dates from Meso- and Neoproterozoic strata contribute to the recently defined Precambrian stratigraphical timescale of China agreed by the Subcommission on the Precambrian System, and the National Commission on Stratigraphy of China on Nov. 24, 2009. First, the age range of the Changcheng System, including the Changzhougou, Chuanlinggou, Tuanshanzi and Dahongyu formations has been constrained to 1.8–1.6 Ga. Second, the Jixian System including the Gaoyuzhuang, Yangzhuang, Wumishan, Hongshuizhuang and Tieling formations has been constrained to 1.6–1.4 Ga. Third, an as-yet unnamed (undefined) system (1.4–1.0 Ga) is only developed in the Xiamaling Formation at the Jixian section, Tianjing. Fourth, the Qingbaikou System, including the Luotuoling and Jing’eryu formations has been constrained to 1.0–0.78 Ga. Fifth, the Nanhuan System ranges between 780–635 Ma, and the Sinian System is within 635–542 Ma. However, according to a series of SHRIMP U-Pb dates from the late Precambrian in the Jiangnan Orogen Belt in South China Platform, the constrained strata will be redefined as in the upper part of the Qingbaikou System. To aid global geodynamics, it is useful to denote a late Precambrian section with unified, precise and high-precision chronological dating; this is here defined in North China Block and Jiaoliao-Korean Block. However, the Neoproterozoic Qingbaikou study in North China will be influence in whole Meso- and Neoproterozoic in the Jiangnan Orogenic Belt in between the Yangtze Block and the Cathaysia Block in South China.     

楚雄盆地下侏罗统磨拉石楔沉积与含油性研究

楚雄盆地为一中生代周缘型走滑前陆盆地。通过对下侏罗统冯家河组沉积特征的详细研究与对比,作者认为早侏罗世是楚雄前陆盆地强烈坳陷与沉降的主要发展时期,从早期到晚期经历了一个突然变深又变浅的典型前陆盆地充填过程。在前陆冲断块体的不断逆冲和加载条件下,楚雄盆地西部早侏罗世沉积物的来源主要为哀牢山造山带隆起,其沉积环境以滨、浅湖或湖泊三角洲为主。位于盆地东北部的永仁中和、大姚龙街等地区的早侏罗世沉积物则来源于元谋古隆起,沉积特征亦显示其为滨、浅湖或湖泊三角洲相。位于盆地中部的楚雄会基关地区(楚参一井),下侏罗统沉积厚度急剧增加,测井曲线、录井资料以及岩心薄片鉴定、粒度分析均显示其沉积环境为深湖央浊积砂体。在新平叠社莫一带也发现有深湖相泥灰岩或灰泥岩沉积。由此表明,早侏罗世楚雄前陆盆地的沉降与沉积中心已经从晚三叠世的古哀牢山前缘向NE迁移至楚雄会基关以及新平叠社莫一带,盆地内的沉积物呈明显的前陆楔形体充填。大姚龙街地区冯家河组第三段中首先发现的沥青砂岩进一步增强了楚雄盆地产油气的可能性。根据产状,沥青砂岩分为缝隙型和粒间孔型两类,它们同产于逆韵律结构发育的湖泊三角洲相沉积层序。因此,对该区下侏罗统缝隙型圈闭以及岩性圈闭构造应予以足够的重视。