东天山早中生代侵入体地球化学特征及其构造意义

东天山百灵山西辉长岩、似斑状花岗岩近年来才被发现,为了解其成因及相关大地构造背景,对其进行地质学、地球化学、锆石U-Pb定年及Sr-Nd同位素分析.LA-ICP-MS锆石U-Pb测年结果显示,百灵山西辉长岩、似斑状花岗岩分别形成于236 Ma和228 Ma.辉长岩具有较低的SiO2(43.50％～46.03％)含量,较...     

西藏它日错地区多巴组沉积环境及石油地质意义

西藏它日错地区是中特提斯的一个重要深坳陷区,发育了巨厚的下白垩统海陆交互相和浅海碳酸盐岩沉积,其中多巴组厚度超过了地５００ｍ,主要沉积相类型包括陆源碎屑湖坪相、碳酸盐浅海、水下浅滩,混合沉积过渡带等,在它日错一带形成坳陷中心,主要物源从南、西南方向进积,多巴组的烃源岩主要为浅海相地,向它划方向增多、加厚、有机质类型为混合型,可能的集集岩是浅滩相介壳灰岩、浅海相泥晶灰岩及潮坪相砂岩,裂隙是其主要的储集空间,而潮下带泥岩则可成为有利盖层,垂向上由于多旋回叠加,具有较好的生储盖盖组合,但所发现的烃源岩厚度较薄是其不利因素。     

Instability characteristics of the East Asian Monsoon recorded by high-resolution loess sections from the last interglacial (MIS5)

The selection of high-resolution loess sections is needed in order to determine the climatic variability of the East Asian Monsoon during the last interglacial. Two sequences of S1 on the eastern and west-ern sides of the Liupan Mountain were both composed of five paleosol layers and four loess layers,indicating that there were five strong summer monsoon events and four strong winter monsoon events in MIS5. This corresponds with other records of the East Asian Monsoon,along with NGRIP and the North Atlantic records,implying that the climate of the Northern Hemisphere was very instable during the last interglacial. Two layers of paleosols and one layer of loess had developed during MIS5a and MIS5c. Compared with MIS5e,the climate in MIS5a and MIS5c fluctuated more intensively on a millen-nial scale,whereas the climate was relatively stable in MIS5e.     

Ternary geochemical-tracing system in natural gas accumulation

The establishment of geochemical-tracing system of gas generation and accumulation is helpful to re-elucidating the gas migration and accumulation in time and space. To deduce the complex process of gas accumulation, a ternary geochemical-tracing system is set up, according to stable isotope inheritance of source rocks, kinetic fractionation of stable isotopes, time-accumulating effect of noble gas isotopes, mantle-derived volatile inheritance, and organic molecule inheritance of light hydrocarbons and thermally kinetic fractionation in their generation, in combination with the previous achievements of gas geochemistry and geochemical parameters of gas-source correlation. There are tight interactions for the geochemical parameters with much information about parent inheritance and special biomarkers, in which they are confirmed each other, reciprocally associated and preferentially used for the requirement so that we can use these geochemical parameters to effectively demonstrate the sources of natural gas, sedimentary environments and thermal evolution of source rocks, migration and accumulation of natural gas, and rearrangement of natural gas reservoirs. It is necessary for the ternary geochemical-tracing system to predict the formation of high efficient gas reservoir and their distribution in time and space.     

Photosynthesis-transpiration coupling model at canopy scale in terrestrial ecosystem

At the hypothesis of big leaf, an ecosystem photosynthesis-transpiration coupling cycle model was established by the scaled SMPT-SB model from single leaf to canopy, and model parameterization methods were discussed. Through simulating the canopy light distribution, canopy internal conductance to CO2 can be scaled from single leaf to canopy by integrating to canopy using the relationship between single internal conductance and photosynthetic photon flux density. Using the data observed by eddy covariance method from the Changbai Mountains site of ChinaFLUX, the application of the model at the canopy scale was examined. Under no water stress, the simulated net ecosystem photosynthesis rate fitted with the observed data very well, the slope and R2 of the line regression equation of the observed and simulated values were 0.7977 and 0.8892, respectively (n = 752), and average absolute error was 3.78 μmol CO2 m-2s-1; the slope, R2 and average absolute error of transpiration rate were 0.7314, 0.4355 and 1.60mmol H2O m-2 s-1, respectively (n = 752). The relationship between canopy photosynthesis,transpiration and external environmental conditions was discussed by treating the canopy as a whole and neglecting the comprehensive feedback mechanism within canopy, and it was noted that the precipitation course affected the transpiration rate simulation badly. Compared to the models based on eco-physiological processes, the SMPT-SB model was simple and easy to be used. And it can be used as a basic carbon and water coupling model of soil-plant-atmosphere continuum.     

Revision of thickness design of cylindrical frozen walls considering frost heave

This paper outlines development of the thickness design of cylindrical frozen walls in artificial ground freezing (AFG). A plain strain mechanical model coupled with infinite surrounding soil and rock ...     

Numerical simulation on excavation-induced damage of rock under quasi-static unloading and dynamic disturbance

During the excavation of underground opening, the rock may experience a complex loading path that includes the highly confined compression before excavation, unloading of confining stress and further disturbance of dynamic loading after excavation. By using Rock Failure Process Analysis for Dynamics (RFPA-Dynamics), the failure of rock sequentially subjected to this complex loading path is numerically simulated, in order to examine the rock failure mechanism induced by excavation. The RFPA-Dynamics is firstly used to reproduce the failure of rock under confined compression, followed by unloading of confining pressure, and it is validated against with the existing experimental observation. Then, the failure characteristics of rock specimen sequentially subjected to the quasi-static triaxial loading, unloading of confining pressure and dynamic disturbance are numerically simulated, where the effect of magnitude of axial loading and confining pressure, and duration and amplitude of the dynamic disturbance on the final failure patterns of rock are examined. The numerical results indicate that the arc-shaped spalling damage zone is prone to develop with the increase in the axial pressure and lateral pressure coefficient. As for the effect of dynamic disturbance, the contribution of duration and amplitude of dynamic disturbance on the energy input are similar, where the area of damage zone increases with the energy input into the rock specimen. In this regard, the area of the damage zone is influenced by both the magnitude of in situ stress and waveform of dynamic disturbance. This study denotes that it is of great significance to trace the complex loading path induced by excavation in order to capture the rock failure mechanism induced by underground excavation.     

免疫多糖对栉孔扇贝酸性磷酸酶、碱性磷酸酶和超氧化物歧化酶活性的影响

在栉孔扇贝的血清、血细胞和肝脏提取液中均发现有酸性磷酸酶（ＡＣＰ）、碱性磷酸酶（ＡＬＰ）和超氧化物歧化酶（ＳＯＤ）活性,其中,ＡＣＰ和ＡＬＰ在肝脏中的活性最高。采用１．０％的虫草多糖或海藻多糖作为免疫药物,对栉孔扇贝进行注射刺激后,发现血清中的ＡＣＰ、ＡＬＰ和ＳＯＤ活性有显著提高,血细胞中的ＡＣＰ和ＳＯＤ活性也有所增加,而肝脏提取液的这三种酶活性的变化不很明显。研究认为这两种多糖具有增强栉孔扇贝免疫活性的作用,在水产养殖业中有一定的开发价值。     

地震台站雷电防护技术探讨

地震台站的仪器多采用集成电路、集成块等高精密电子元件,承受外部环境能力相对较弱,容易遭受雷电的侵害。在分析雷电如何危害地震台站仪器设备基础上,针对地震台站工作实际,探讨应用雷电防护技术,减轻雷电对地震观测技术系统仪器设备的损害,及对地震台站雷电防护的参考意义。     

深圳大鹏半岛国家地质公园中生代火山地层的时代讨论

深圳地区中生代火山地层分布区是我国东南沿海浙闽粤港火山活动带的一个重要组成部分,是我国沿海地区侏罗纪—白垩纪火山地层较有代表性地段,也是研究我国东南沿海侏罗纪—白垩纪火山活动的天然博物馆。近期通过野外观察,测制火山地层剖面,进行锆石同位素激光定年测试,对大鹏半岛国家地质公园中生代火山地层的时代提出新的认识,将原划分为上侏罗统高基坪群划分为早—中侏罗世塘厦组(181.8 Ma?)、中侏罗世吉岭湾组(165.8 Ma)、晚侏罗世梧桐山组(156.9~145.6 Ma)、晚侏罗世—早白垩世七娘山组(146.3~131.0 Ma)、早白垩世官草湖群等。