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81.
GEOCHEMICAL CHARACTERISTICS OF GRANITES AND ITS STRUCTURAL GENETIC ENVIRONMENT IN THE NANDAN-HECHI METALLOGENETIC BELT, NORTHWEST GUANGXI 总被引:3,自引:0,他引:3
The Nandan-Hechi metallogenetic belt is the most important tin-polymetallic producing district in China, and is the location of the Dachang super-large tin deposit. Based on the detailed field investigation and isotopic data, the stages of magmatic activity in the Nandan-Hechi metallogenetic belt have been lined out in this paper. Through the study about the geochemical characteristics of different granites, and by using ω(Al2O3)-ω(SiO2), ω(TFeO)/[ω(TFeO) ω(MgO)]-ω(SiO2), AFM, ACF and Rb-Yb Ta, Rb-Y Nb,Ta-Yb, Nb-Y discrimination diagrams in combination with regional geological setting analysis, the authors carried out analyses about the structural environment for the formation of the granites, and discussed the structural environment and dynamic setting for the large scale mineralization in this area. Our study indicates that the majority of the granites in Nandan-Hechi metallogenetic belt belong to the POG type,while the later stage alaskite belongs to the RRG CEUG type. The granites were formed at the stage of structural transformation from postorogenic phase to intraplate setting. But the major structural environment is characterized by steady regional extension. The formation age for the granites coincides with the time for this transformation, and this translation environment is favored for large-scale metallogenesis. 相似文献
82.
通过在新疆哈密五堡乡南大草滩严重缺水地区的水地质勘察,找到了一个日供水量为3000m^3/d的小型水源地,为在同类地区找水提供了一定的找水经验。 相似文献
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85.
神经网络在判别煤矿突水水源中的应用 总被引:6,自引:0,他引:6
矿井突水水源的识别是矿井防治水工作的基础,快速准确地判别突水的来源对整个矿井的安全生产起着十分重要的作用。以峰峰矿区梧桐庄矿为例,应用神经网络的方法,对矿井突水水源进行了系统研究。结果表明,运用该方法取得了较好的效果,并可以用此模型来解决类似的评价和判别问题。 相似文献
86.
针对吉林市铁合金厂排污口下游江水的污染情况,设计研究江段,分段、分层取样。通过野外与室内实验,分析研宄了江水污染物的主要成分,并对NH4^ 的纵向、横向、垂向上的分布特征及其影响因素进行了详细研究。结果表明,垂直方向污染物扩散可以瞬时完成,在极短的时间内基本能达到完全混合;在横向和纵向上,岸边排放污染物一般只在近岸扩散,污染范围一般也只在靠近排污口一带;随着离排污口距离增大,污染物浓度降低,横向变化率较纵向大。本研究为排污口的污染物控制与治理、水资源保护提供了科学依据。 相似文献
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According to calculation results of ocean chlorophyll concentration based on SeaWiFS data by SeaBAM model and synchronous ship-measured data, this research set up an improved model for CaseⅠand CaseⅡwater bodies respectively. The monthly chlorophyll distribution in the East China Sea in 1998 was obtained from this improved model on calculation results of SeaBAM. The euphotic depth distribution in 1998 in the East China Sea is calculated by using remote sensing data of K490 from SeaWiFS according to the relation between the euphotic depth and the oceanic diffuse attenuation coefficient. With data of ocean chlorophyll concentration, euphotic depth, ocean surface photosynthetic available radiation (PAR), daily photoperiod and optimal rate of daily carbon fixation within a water column, the monthly and annual primary productivity spatio-temporal distributions in the East China Sea in 1998 were obtained based on VGPM model. Based on analysis of those distributions, the conclusion can be drawn that there is a clear bimodality character of primary productivity in the monthly distribution in the East China Sea. In detail, the monthly distribution of primary productivity stays the lowest level in winter and rises rapidly to the peak in spring. It gets down a little in summer, and gets up a little in autumn. The daily average of primary productivity in the whole East China Sea is 560.03 mg/m2/d, which is far higher than the average of subtropical ocean areas. The annual average of primary productivity is 236.95 g/m2/a. The research on the seasonal variety mechanism of primary productivity shows that several factors that affect the spatio-temporal distribution may include the chlorophyll concentration distribution, temperature condition, the Yangtze River diluted water variety, the euphotic depth, ocean current variety, etc. But the main influencing factors may be different in each local sea area. 相似文献
89.
On August 5, 2001, Shanghai was struck by a torrential rainfall due to the passage of a tropical depression (TD). The rainfall intensity has been the strongest in recent 50 years. In this paper, a set of mesoscale re-analyses data and the planetary boundary layer observation from a wind profiler are used to understand the possible mechanism of such a heavy rain. Results show that the outburst of a southerly jet in the lower atmosphere triggered the explosive development of cyclonically vertical vorticity in the region with steep potential temperature surfaces in front of the TD; while the cyclonic vorticity increased notably at higher levels due to the small atmospheric vertical stability of westerly currents in the vicinity of Shanghai. The simultaneous sharp development of cyclonic vorticity at different levels should be the main cause for the torrential rainfall. 相似文献
90.
地球物理信号中普遍含有噪声,消除噪声是地球物理信号处理中的关键技术之一.奇异功率谱分析(SSA)是在状态空间(又称相空间)中研究(系统)动力学、非线性科学与混沌现象的方法.本文在状态空间中通过SSA分解,研究、应用地球物理序列的尺度不变性进行多维分形滤波:通过在状态空间的SSA分解,构造了经验正交函数系(EOF);在EOF子空间中定义了两种尺度与测度后,发现了两种测度与尺度皆在多个尺度范围内存在尺度不变性;利用这种尺度~测度的尺度不变性,设计、实现了多维分形奇异功率谱(MSSA)滤波模型;处理解释了大洋钻探(ODP)1143A孔岩芯自然反射性(NGR)资料;Fourier功率谱分析结果证明,MSSA能有效地压制噪声,提取有用信号.研究得出,嵌入维数对MSSA基本无影响(小于1/1000),多维分形滤波器(MSSA)能有效压制噪声或提取有用信号. 相似文献