山东招远-平度断裂带南段地球物理特征及找矿预测          下载免费PDF全文

韩振玉  王巧云  王润生  胡雪平  郭晶  胡创业 《山东国土资源》2020,36(11)

以招平断裂带南段为研究对象,综合利用招平断裂带的地质、重力、磁法、大地电磁等资料总结了研究区的重磁场特征及岩石的物性特征,并通过5条典型剖面开展可控源音频大地电磁测深（CSAMT）,进一步查明了研究区的成矿条件和找矿前景。根据CSAMT实测数据,反演及推断了招平断裂带南段深部的延深及变化情况,推测脆性断裂是招平断裂带南段金矿找矿的关键因素并据此在实测剖面上圈定了8处成矿有利靶区。本文认为研究区的北部具有较好的成矿条件和找矿潜力。  相似文献   

Semantic linking of complex properties,monitoring processes and facilities in web-based representations of the environment     

Adam M. Leadbetter  Peter N. Vodden 《International Journal of Digital Earth》2016,9(3):300-324

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Diagenesis and reservoir properties of Middle Jurassic sandstones,Traill Ø, East Greenland: The influence of magmatism and faulting     

《Marine and Petroleum Geology》2016

The c. 500 m thick Middle Jurassic sandstones of the fluvial Bristol Elv and marine Pelion Formations of the East Greenland Basin are evaluated here in order to improve the understanding of the processes that influenced the diagenetic evolution. The study may help to predict the reservoir properties of sandstones affected by magmatism and faulting, both in general and specifically in undrilled areas on- and offshore East Greenland and, in the Vøring Basin on the Mid-Norwegian shelf. The study shows a variety of authigenic mineral phases dominated by quartz cement, carbonate cement, illite and iron-oxide. One of the clear differences between the two formations is the presence of early carbonate-cemented horizons in the marine sandstones; these horizons are inferred to reflect a primary concentration of biogenic clasts and fossil shells. Intense quartz cementation occurs primarily in the fluvial sandstones but the marine sandstones are also highly quartz-cemented. Two episodes of burial and uplift are recorded in the diagenetic sequence and widespread grain-crushing in coarse-grained intervals is believed to result from overpressure and subsequent compaction due to sudden pressure release along major faults. Maximum burial depths may only have been around 2000–2500 m. Cathodoluminescence analyses show that grain crushing was followed by intense quartz cementation. The quartz cement is to a great deal believed to have formed due to increased surface area from crushing of detrital quartz grains, creating fresh nucleation sites for the quartz. Cathodoluminescence investigations also show that only minor pressure dissolution has taken place between detrital quartz grains and that the ubiquitous quartz cementation displays several growth zones, and was thus in part the result of the introduction of silica-rich extra-formational fluids related to the flow of hot fluids along reactivated faults and increased heat flow and temperature due to magmatism. This interpretation is supported by fluid inclusion homogenization temperatures between 117 and 158 °C in quartz cements. In one of the two study areas, the development of macroscopic stylolites has significantly enhanced quartz cementation, probably in connection with thermal convection flow. As a result of the magmatic and fault-related quartz cementation and illitization, the reservoir quality of the sandstone formations deteriorated and changed drastically.  相似文献   

Geotechnical and Geoacoustic Properties of Volcanic Soil in Ulleung Island,East Sea of Korea     

Changho Lee  Yong-Hoon Byun 《Marine Georesources & Geotechnology》2016,34(7):659-667

The unique material properties of volcanic soils may cause stability problems within the soil. However, few studies have examined the composition and engineering characteristics of volcanic soils below sea level. The objective of this study is to investigate the engineering properties of volcanic soils sampled from Ulleung Island. For the volcanic soils, the index properties, particle geometry, and mineralogy are analyzed in the laboratory. An oedometer cell incorporated with bender elements is used to measure the small-strain stiffness and compressibility of the volcanic soils. To obtain the large strain strength parameter and hydraulic conductivity of the volcanic soils, direct shear tests, and constant head permeability tests are performed. The experimental results show that the basic index properties of volcanic soils sampled from Ulleung Island are very similar to the values of previously published reference data: poorly graded with a median grain size, very low fine fraction, and slightly high specific gravity. In addition, the particle surface texture features and elementary analysis indicates a dark grain color, small pits or holes in the grain, and relatively low SiO₂ and high Fe₂O₃ contents. The friction angle of the volcanic soils depends on the relative density, and the hydraulic conductivity varies according to e³/(1 + e) and D₁₀². The characterization of the electrical properties in Ulleung Island needs to be conducted with caution due to the high Fe₂O₃ content in the volcanic soils.  相似文献   

华北香河站一次霾污染事件的综合观测研究     

夏俊荣  吴丹  齐冰 《气象与环境科学》2016,39(2):10-17

利用激光雷达、太阳光度计、系留气艇低空探测数据及MODIS卫星数据等多源资料,对2007年2月初发生在我国中东部地区的一次大范围霾污染事件进行了综合分析,重点分析了华北香河站垂直向气溶胶光学特性的变化特征,并初步讨论了气溶胶区域输送。分析结果表明:霾污染中心位于大城市、城市群或者盆地等污染物源排放强度大或者地形不利于污染物扩散的地区,形成了6个污染中心;2日霾最严重时,近地面气溶胶消光系数(355nm)达到1.8 km~(-1),是霾发生前的3倍;霾最严重时气溶胶光学厚度(340 nm)为1.4,较前后日的高;随着边界层高度的下降,底层气溶胶快速积累;香河站气溶胶在垂直向存在明显的分层现象,上层600—1000 m高度气溶胶受区域输送的影响,其光学厚度占整层气溶胶的比值能达到43.6%,甚至更高;本次霾过程以细粒子为主;弱高压系统、低至100 m左右的逆温层高度及低风速等气象条件对此次霾的形成起到了重要的作用;而3日出现的大风则很可能是驱散霾的重要因子。  相似文献   

有向拓扑的河系渐变自动绘制算法     

吴伟  李成名  殷勇  郭沛沛 《测绘科学》2016,(12):89-93

河系渐变绘制是地图制图中水系要素表达的重要方面。针对全自动河系渐变研究较少的现状,该文提出一种基于树状约束stroke特征的河系渐变自动绘制算法。该方法在深入分析有向拓扑的数据结构基础上,重点解决河口模式识别、树状约束stroke特征构建、河系层次关系建立、主支流分级渐变等问题,实现全自动河系渐变,并进行实践测试。结果表明,该算法在地图制图过程中无须对河系河源、河口识别、河系分层和河系渐变进行人工干预,自动化程度高,大幅度提升制图效率,渐变效果优于人工绘制效果。  相似文献   

Estimating apparent thermal diffusivity of soil using field temperature time series     

Pathmanathan Rajeev  Jayantha Kodikara 《Geomechanics and Geoengineering》2016,11(1):28-46

Reliable estimates of soil thermal properties such as heat capacity, thermal conductivity, and diffusivity are important in analysis of heat transmission through soils in applications such as shallow geothermal applications, buried electrical conduits, and in general heat/fluid flow analyses. A number of analytical, numerical and experimental methods are available to determine the soil thermal properties. In this paper, the analytical and numerical methods developed on the basis of one-dimensional heat conduction equation are used to estimate the apparent thermal diffusivity of soil. Three of the four analytical methods, Amplitude, Phase, and Arctangent provide explicit equations for the apparent thermal diffusivity. Two methods, Harmonic and Numerical, make use of large number of temperature measurements to implicitly solve for the apparent thermal diffusivity. The temperature time series data monitored at different depths in two field sites in Melbourne, Australia for more than 2 year period were used to estimate the apparent thermal diffusivity of soil down to 2 m depth. The apparent thermal diffusivity was calculated using all five methods and compared with laboratory experimental results. The effectiveness of each method in predicting the thermal diffusivity was compared and observed discrepancies were discussed. Finally, the observed soil temperature data for a 12 month period are used to model the temperature variation in the ground analytically using Harmonic method and the model prediction for the following 12 month was compared independently with the field measurements. The analytical model prediction is found to be in good agreement with the field monitored data.  相似文献   

超微粉碎在孔石莼多糖提取中的应用   总被引：1，自引：1，他引：0  

綦慧敏  赵婷婷  张全斌  张虹  牛锡珍  赵增芹 《海洋科学》2005,29(12):56-58

研究超微粉碎技术在孔石莼（Ulva pertusa）多糖提取中的可行性。分别用超微粉碎后提取和常规提取两种方法提取孔石莼多糖,在不同条件下比较其提取率和所得产品的质量。结果表明,超微粉碎后的孔石莼在125℃提取4h收率达到17．39％,与常规方法比较其收率提高28．8％,主要化学组分及其含量没有差异,红外图谱也表明,两种方法所得的孔石莼多糖其主要官能团没有差异,说明超微粉碎技术在孔石莼多糖提取过程中的应用是可行的,它除了保持孔石莼多糖的品质外,可在较易控制的条件下提高其提取率。  相似文献   

单轴压缩下软岩的动态力学特性试验研究   总被引：7，自引：0，他引：7  

李海波  王建伟  李俊如  周青春  刘亚群 《岩土力学》2004,25(1):1-4

对软岩(砂浆模拟材料)进行了应变速率范围为10-5~101s-1的动单轴压缩实验。实验结果表明,试样的抗压强度随应变速率的增加有较明显的增加趋势,增加幅度大于硬岩;试样的弹性模量以及泊松比随着应变速率的增加均有增加的趋势,但幅度小于强度的增加幅度。并根据不同应变速率下试样破裂面的SEM实验结果,初步地分析了软岩动态力学特性机理。  相似文献   

黄上丘陵林地土壤侵蚀与土壤性质变化     

查小春  唐克丽 《地理学报(英文版)》2003,13(3):373-378

The serious soil erosion caused the fragile eco-environment in the Loess Plateau. In modern soil erosion of the Loess Plateau, the man-made accelerated erosion was the dominant erosion pattern (Tang etal., 1993a; 1993b). There are many kinds of human activities to accelerate erosion, of which the most influential activities are to destroy forest and grass, even to destroy vegetation. Reclamation at the expense of destruction of forestland and grassland artificially could increase soil erosio…  相似文献