Water quality and eutrophication in the Guangzhou Sea Zone of the Pearl River estuary

To gain a better understanding of water quality and eutrophication,we investigated the seasonal and spatial distribution of water quality at 17 stations in the Guangzhou Sea Zone (GZSZ).Nutrients,chlorophyll-a (Chl-a),salinity,chemical oxygen demand,and other physical and chemical parameters were determined in February,May,August and October from 2005 to 2007.The concentrations showed ranges of 93.2-530.4 μmol/L for dissolved inorganic nitrogen (DIN),0.62-3.16 μmol/L for phosphate (PO4-P) and 50-127 μmol/L ...     

南黄海构造样式的特征与含油气性

新一轮国土资源大调查项目的地震资料揭示,南黄海不同构造层内发育各具特色及多种类型的构造样式,主要表现有压缩、伸展和反转构造样式,分别有基底卷入型的压性断块和冲断构造、挤压背斜构造、潜山构造、穹隆构造、张性断块构造以及断层扩展反转褶皱构造、盖层滑脱型褶皱反转构造、单条冲断系负反转构造等。本文着重从剖面形态和平面展布分析各构造样式的特征,追溯它们在时、空上的相互联系和叠置关系,阐述印支、燕山和喜马拉雅运动对构造样式的作用,认为这些构造样式是地壳挤压、伸展和走滑联合作用的结果,并探讨了油气赋存的规律。     

Influences of human activities and agriculture on groundwater quality of Kayseri-Incesu-Dokuzpınar springs,central Anatolian part of Turkey

Human activities and agriculture have had direct and indirect effects on the rates of contamination of groundwater in the Incesu-Dokuzp inar spring area. Direct effects include dissolution and transport of excess quantities of fertilizers with associated materials and hydrological alterations related to irrigation and drainage. Indirect effects may include changes in water–rock reactions in soils and aquifers caused by increased concentrations of dissolved oxidants, protons, and major ions. Agricultural activities have directly or indirectly affected the concentrations of a large number of inorganic chemicals in groundwater, for example NO ₃, N ₂, Cl, SO ₄ ², H ⁺, K, Mg, Ca, Fe, Cu, B, Pb, and Zn, as well as a wide variety of pesticides and other organic compounds. For reactive contaminants like NO ₃, it is recommended that a combination of hydrochemical and environmental-tracer analytical approaches might be required to resolve changing inputs from subsequent alterations as causes of concentration gradients in groundwater. The water type of Dokuzp inar springs is mainly Na–Mg–Ca–Cl–HCO ₃. Note that the water types of the springs were directly related to the hydrogeochemical properties of outcrops at the study area. Thus, the high concentration of Ca ²⁺ and HCO ₃ is mainly related to the high CO ₂ contents in the marbles, whereas the high Na concentration arises from the existing syenite, volcanic ash, basalt, and clay units, although the Incesu-Dokuzp inar springs cover most of the drinking and irrigation water demands of this area. The high concentrations of NO ₃ and NaCl show that the area around the springs is continuously being contaminated by untreated sewage and agricultural wastes, especially during dry periods. Therefore, this approach is based on the vulnerability studies of the catchment area, determination of the transfer time of the pollutant, and the water-bearing formations of Incesu-Dokuzp inar springs. Vulnerability in this study is defined as the intrinsic hydrogeochemical characteristics of an aquifer, which may show the sensitivity of groundwater to be contaminated by different human activities.     

郴州市枞树板铅锌银矿床地质特征

该矿床主要受北东向断裂构造控制，矿化围岩为震旦系浅变质岩，矿脉成群成带出现，主矿脉延伸大、品位富。具有较大的找矿前景。     

盈江铀矿的新资料

本文第一次提供了由单晶X射线衍射分析测定的盈江铀矿的空间群和晶胞参数。该矿物产于广东省下庄铀矿田。斜方晶系,空间群Bmmb(63),a=15.707(3),b=17·424(3),c=13.692(2)?,V=3747?~3,Z=4。Dc=4.60g/cm~3,Dm=4.54g/cm~3。化学式:(K_2,Ca)(UO_2)_7(PO_4)_4(OH)_6·6H_2O。二轴晶,负光性。2Vc=36°,2Vm=36—38°。Ng=1.707(2),Nm=1.703(2),Np=1.666(1)。光性方位:Ng//Y,Nm//X,Np//Z。     

岩浆侵位过程的反演及其在矿体定位预测中的应用--以安徽铜陵凤凰山矿田为例

岩浆侵位过程是一个复杂的物理化学过程，控制着岩体和矿床的空间分布。凤凰山矿田位于铜陵矿集区，经过多年的开采，后备储量严重不足，急需扩大远景储量。采用三维流体动力学模型与流体势相结合，对矿田内的新屋里岩体侵位过程进行反演。结果表明，凤凰山矿田已知矿床均产于流体势梯度急剧变化带内。相思树、横山岭预测单元从地表向地下不仅同处于流体势梯度最大变化带内，还位于有利的成矿构造环境，具有良好的成矿远景。     

铜陵凤凰山铜矿床斑岩型矿体原生叠加晕特征及其成矿预测意义

通过对凤凰山铜矿床新的矿化类型—斑岩型铜矿体的系统采样分析，认为斑岩型铜矿体具有各自的原生晕分带性；多阶段矿化作用和多矿体的迭瓦状产出，使各阶段矿化作用和各矿体的原生晕叠加形成了统一的、范围较大的、较为稳定的原生叠加晕。因此，矿体的原生晕和原生叠加晕特征可指导本区斑岩型铜矿体的成矿预测。     

广东南海蒙脱石铝柱撑前后高温热变化的差异

对广东南海蒙脱石铝柱撑进行加热发现其前后高温热变化有比较明显的差异：铝柱撑蒙脱石的结构可保持到700C，其001面特征峰仅由1．6898nm减小到1．5601nm；900C时蒙脱石特征峰消失，并有部分尖晶石和无定形相生成；1100C时生成莫来石、尖晶石和玻璃相，其显微结构为玻璃相覆盖的细晶结构。与之相应的原料蒙脱石700C煅烧后001面特征峰由1．5121nm减小为0．9704nm；900C煅烧后，蒙脱石层状结构破坏；1100C煅烧后，有明显的方石英的峰值出现，1200C热处理后，莫来石衍射峰出现。     

Structural characteristics of zeolite/TiO-2 composite and photocatalysis of toluene degradation

1Introduction Researchontheapplicationofnaturalminerals(zeolite,montmorillonite,etc.)inenvironmentalpro tectionisattractinggreatattentionofmoreandmorere searchers(WuPingxiaoetal.,2001;Suhasetal.,2000).Asthenaturalmineralshavelargenumbersof micro poresandbigsurfaceareas,thezeolite/TiO2compositephotocatalystcanbepreparedbycombining TiO2withzeolite.Nucleus formationfreeenergyof TiO2crystaldecreasesinamulti phasesystemofzeo lite,whichhelpsformnanometerTiO2crystalanden richstructuralhydroxyl;op…