石油层上方重金属射流晕分布的数学-物理模型   总被引：1，自引：1，他引：1  

周子勇  О.Ф.Путиков 《物探与化探》2002,26(5):329-333

通过分析石油层上方形成的重金属元素射流晕,可以确定油气存在的可能性和含油层的水平展布及有关的物理、几何参数。笔者初步建立了这种射流晕分布的数学物理模型,探讨了利用所建立的数学—物理解释实测地电化学异常的可能性。  相似文献   

Total OH Loss Rate Measurement     

Thomas A. Kovacs  William H. Brune 《Journal of Atmospheric Chemistry》2001,39(2):105-122

A new instrument has beendeveloped to measure the total decay rate of OH in ambient air. Theinstrument is based on the discharge flow technique in which OHgenerated within the instrument is reacted with ambient air pulled intothe flow tube. The OH decay is monitored by laser-induced fluorescence. Thistotal decay rate is compared to the sum of the individual decay rates ofOH with each trace species measured in the air to test for missing OHreactants. OH decay rates measured in an urban environment in thesummer of 1999 illustrates the promise of this technique.  相似文献   

胶东金矿床围岩蚀变带内云母类矿物、矿物化学-多型系列及其找矿信息          下载免费PDF全文

Francesco P.Sassi  杨敏之 《地质找矿论丛》2001,16(2):73-80

对胶东15个金放床围岩蚀变带内30个云母类矿物的地质产状，空间分带，与矿化关系地质调查基础上，着重对各类型金矿床蚀变带内云母类矿物进行了单矿物提纯，矿物化学定量分析，物理性质鉴定，X光衍射分析，差热分析，红外吸收光谱分析，晶格常数计算，形成条件等方面的系统研究，确定了蚀变岩带内有9种云母类矿物，5个矿物化学－多型系列，新鉴定出5种云母类矿物，绿鳞石（Celadonite),铁绿鳞石（Ferian Celadonite)，铁铝绿磷石（Ferian-Alumino Celadonite)，铝绿鳞石（Alumino Celadonite)和伊利石（Illite)，总结了云母类矿物各系列的演化特征，查明了金矿床各蚀变－矿化带内所出现的云母类矿物晕，指出了各云母类矿物晕的找矿信息。  相似文献   

Are Majhgawan-Hinota pipe rocks truly group-I Kimberlite?     

Ravi Shanker  S. Nag  A. Ganguly  A. Absar  B. P. Rawat  G. S. Singh 《Journal of Earth System Science》2001,110(1):63-76

The diamond bearing pipe rocks in Majhgawan-Hinota (more than four pipes) occur as intrusives in sandstones of Kaimur Group. These Proterozoic (974 ±30-1170 ±20 Ma) intrusive rocks, occupying the southeastern margin of Aravalli craton, were called as ‘micaceous kimberlite’ in tune with the reported kimberlite occurrences from other parts of the world. Judging from the definition of kimberlite, as approved by the IUGS Subcommission on Systematics of Igneous Rocks, it is not justified to call these rocks as ‘micaceous kimberlite’. Rather the mineralogical assemblages such as absence of typomorphic mineral monticellite (primary), abundance of phlogopite cognate, frequent presence of barite and primary carbonate mostly as calcite coupled with ultrapotassic and volatile-rich (dominantly H₂O) nature and high concentration of incompatible elements (such as Ba, Zr, Th, U), low Th/U ratios, low REE and no Eu-anomaly clearly indicate a close similarity with that of South African orangeites. Thus orangeites of Proterozoic age occur outside the Kaapvaal craton of South Africa which are much younger (200 Ma to 110 Ma) in age.  相似文献   

Secretinite—reflectance and chemical data from two high volatile bituminous coals (Upper Carboniferous) of North America     

Paul C. Lyons  Maria Mastalerz   《International Journal of Coal Geology》2001,45(4)

Secretinite—a maceral of the inertinite group as recognized by the ICCP in 1996—is a noncellular maceral of seed fern origin. New reflectance data indicate that this maceral has primary anisotropy with bireflectances of 0.4% to 0.9% in high-volatile B bituminous (Ro=0.6%) Carboniferous coal of North America. The highest reflectance is in cross-section as opposed to longitudinal section. Characteristic feature of secretinite is the virtual absence of Si and Al, unlike that in associated vitrinite. This indicates the absence of submicron aluminosilicates in secretinite and their presence in vitrinites. Secretinite is highly aromatic as indicated by low O/C ratios and high contribution of aromatic hydrogen bands detected by FTIR analysis.  相似文献   

Fluvial Geochemistry through a Short-Duration, Tropical-Cyclone Induced Discharge event in the Burdekin River and Hann Creek, North Queensland, Australia     

Jan Alexander  Chris R. Fielding  Simon J. Wakefield  Mark T. George  Clare F. Cottnam 《Aquatic Geochemistry》2001,7(4):275-293

The chemical composition of river water integrates a number of factors such as weathering, land use, climate, vegetation cover and human activity that individually affect its chemistry. Short term variations may also be significant. The Burdekin River, NE Australia, is an example of a class of tropical streams which experiences two to four orders of magnitude variation in discharge in response to seasonal but erratic monsoonal and cyclonic rainfall. In these systems individual discharge events last for days to weeks. Given the inherent difficulty sampling these events published data on water chemistry (and thus calculated fluxes and global budgets) may tend to be biased to low flow conditions. One such discharge event in February 1996 has been investigated for its impact on the chemistry of the water. Major cations (Na, Mg, K, Ca) all decreased in concentration as the water level rose, as did the minor elements Sr, Ba and U. Some other trace elements, notably Rb, Cr, Pb and REE were enriched in the peak flow waters. The flux of all measured elements increased substantially during the seven days of the discharge event. Such short term but significant events will have a major impact on the annual fluxes of elements delivered to the oceans from the land and global discharge budgets may need to take them into account when refining databases in the future.  相似文献   

四川呷村VHMS矿床：从矿石化学分析到地球化学模型   总被引：7，自引：2，他引：7  

李佑国  侯增谦 《矿床地质》2001,20(2):119-128

中国四川呷村矿床是一个典型的含金富银多金属VHMS矿床，其主要成矿金属元素Cu,Zn,Pb,Ag,Au丰度型式均呈非正态分布，多由两重或多重母体构成，揭示矿床经历了两次以上的成矿作用过程。成矿金属元素总体上集中于块状矿带，但贱金属Cu,Zn,Pb没有明显的下部富Cu Zn、上部富Pb Zn的分带，贵金属Ag、Au没有显示明显的层位优选性。矿床构造恢复和化学结构图像显示，金属元素的空间分布和富集机制严格受海底凹陷盆地的基底张性断裂和热水喷口位置控制。至少有4条近SN走向的盆地基底断裂带构成海底下部热水流体的迁移－排泄通道和网脉状成矿带的容矿空间；近EW向断裂与4条SN向断裂的交汇部位，成为上排泄的热水流体在海底的主要喷口，控制了金属元素在海底凹地的空间分布。分别处于凹陷盆地东缘和西缘的热水喷口，因正地形地貌形态而形成山丘堆式矿体（mound-syle)，而处于凹陷盆地中心的热水喷口则积聚大量热水流体，构成卤水池，淀积席状块状矿体（sheet-style)。  相似文献   

高岭土的化学成分与表面电性研究   总被引：4，自引：0，他引：4  

刘晓文  胡岳华  黄圣生  邱冠周 《矿物学报》2001,21(3):443-447

在前人工作的基础之上 ,研究了高岭土中高岭石的晶体结构、化学成分与表面电性之间的关系。硬质和软质高岭土具有相近的表面零电点 (pzc)值 ,几种硬质高岭土的 pzc值的变化范围为 2 .6～ 3 .8。pzc值与其中的SiO2 的重量百分含量呈正相关 ,与Al2 O3的呈负相关。高岭石的结晶度指数 (CI)并不是决定高岭石pzc值的主要因数。在较宽的pH值范围 ,硬质高岭土比软质高岭土的电位低。在高岭石晶体端面上的等电点 ( pH 7.3± )处 ,高岭土表面的Zeta电位与TFe的重量百分含量呈负相关性 ,与高岭石的结晶度指数 (CI)呈正相关。  相似文献   

Flow and Transport in the Obstacle Layer: First Results of the Micro-Scale Model MITRAS     

K. H. Schlünzen  D. Hinneburg  O. Knoth  M. Lambrecht  B. Leitl  S. López  C. Lüpkes  H. Panskus  E. Renner  M. Schatzmann  T. Schoenemeyer  S. Trepte  R. Wolke 《Journal of Atmospheric Chemistry》2003,44(2):113-130

A new atmospheric micro-scale chemistry, transport and stream model, MITRAS, has been developed within the Tropospheric Research Program (TFS). MITRAS is an obstacle resolving model solving simultaneously the governing equations for chemistry, pollutant transport including soot as well as for the flow and temperature field. The chemical reaction module is based on a simplified RACM mechanism. MITRAS has been tested against quality ensured wind tunnel data. The model results on soot and ozone concentrations as well as on the spatial representativeness of measurement sites underline the necessity for high-resolution flow simulations for case studies on close-to-source chemistry and pollutant transport within the urban canopy layer.  相似文献   

Active Nitrogen in Surface Ozone Depletion Events at Alert during Spring 1998     

B. A. Ridley  J. J. Orlando 《Journal of Atmospheric Chemistry》2003,44(1):1-22

Measurements of NO_x,y were made at Alert, Nunavut, Canada (82.5° N, 62.3° W) during surface layer ozone depletion events. In spring 1998, depletion events were rare and occurred under variable actinic flux, ice fog, and snowfall conditions. NO_y changed by less than 10% between normal, partially depleted, and nearly completely depleted ozone air masses. The observation of a diurnal variation in NO_x under continuous sunlight supports a source from the snowpack but with rapid conversion to nitrogen reservoirs that are primarily deposited to the surface or airborne ice crystals. It was unclear whether NO_x was reduced or enhanced in different stages of the ozone depletion chemistry because of variations in solar and ambient conditions. Because ozone was depleted from 15–20 ppbv to less than 1 ppbv in just over a day in one event it is apparent that the surface source of NO_x did not grossly inhibit the removal of ozone. In another case ozone was shown to be destroyed to less than the 0.5 ppbv detection limit of the instrument. However, simple model calculations show that the rate of depletion of ozone and its final steady-state abundance depend sensitively on the strength of the surface source of NO_x due to competition from ozone production involving NO_x and peroxy radicals. The behavior of the NO/NO₂ ratio was qualitatively consistent with enhanced BrO during the period of active ozone destruction. The model is also used to emphasize that the diurnal partitioning of BrO_x during ozone depletion events is sensitive to even sub ppbv variations in O₃.  相似文献