北武夷下汪家铜多金属矿床地质特征及成因分析

下汪家铜多金属矿床形成于燕山晚期，成矿流体主要来自岩浆期后热液，断裂和岩浆岩是两大重要的成矿条件。控矿构造为北北东向断裂。成矿流体和主要矿质均源于地球深部，以上地幔或壳幔混合带为主，与燕山晚期富碱岩浆活动密切相关。下汪家铜多金属矿床成因上的分析，对该区下一步的找矿工作具有指导意义。     

Recent developments of surface complexation models applied to environmental aquatic chemistry

1　ＢａｃｋｇｒｏｕｎｄＩｎｇｅｏｃｈｅｍｉｃａｌｃｉｒｃｕｌａｔｉｏｎ ,ｖａｒｉｏｕｓｐｏｌｌｕｔａｎｔｓｗｉｔｈａｄｖｅｒｓｅｉｍｐａｃｔｓ (ｅ .ｇ .,ｔｏｘｉｃｉｔｙ ,ｍｕｔａｇｅｎｉｃｉｔｙａｎｄｌｅｔｈａｌｉｔｙ)ａｒｅｕｓｕａｌｌｙａｓｓｏｃｉａｔｅｄｗｉｔｈｈｅｔｅｒｏｇｅｎｅｏｕｓｐａｒｔｉｃｌｅｓ,ｐｒｅｄｏｍｉｎａｎｔｌｙｃｌａｙｍｉｎｅｒａｌｓ .Ｇｅｎｅｒａｌｌｙ ,ｔｈｅｐｒｏｐｅｒｔｉｅｓｏｆｔｈｅｓｅｃｏｍｐｌｅｘｐａｒｔｉｃｌｅｓｓｈｏｕｌｄｂｅｄｅｓｃｒｉｂｅｄｕｓｉｎ…     

多级A/O工艺在国内的应用现状

多级A/O工艺目前在国内市政和部分工业污水处理领域应用较多,具有预处理和污泥处理系统简单,污泥负荷低、处理效果好且稳定,投资低,曝气系统效率高、运行成本较低,维护管理简便等特点,但是在实际运行中也发现存在一些问题,如土池结构不适合地下水位高的地区的局限性,沉淀池效果较差、稳定池多余占地且污泥淤积难以清除,关键设备国产质量有待提高,工业污水处理少数水质指标偏高,需要设计人员选择适合其条件的场合应用,并进一步总结、改进和完善.     

四川呷村多金属矿床地球化学特征及成因

呷村矿床是一个特大型的含金、稀土富银多金属矿床.成矿地质特征与日本黑矿相似.矿床形成于中低温、较低压的环境.成矿溶液为中等盐度、低密度水热体系.铅等成矿元素主要来自岛弧火山岩,硫和锶来自深部岩浆和海水,成矿水介质以大气降水为主,为典型海底火山热液—喷气沉积成因的块状硫化物矿床.     

岳山银铅锌矿床地球化学特征

本文通过对硫同位素、铅同位素、稀土元素、微量元素的研究，总结了安徽岳山银铅锌矿床的地球化学特征，并探讨了其成因，认为该矿床为火山一次火山气液作用形成的中低温热液型银铅锌矿床。     

VARIATION FEATURES OF PRECIPITATION IN GUANGXI

VariationfeaturesofprecipitationinGuangxiUnevendistributionofprecipitationinareas　ByreasonofcomplexlandforminGuangxi,theprecipitationvariesindifferentregionsandisgenerallyabundantinthesouthandthenorth,littleinthemiddleregion;abundantintheeastandlittleinthewest;abundantinhillyareasandlittleintherivervalleysandbasins;abundantinwindwardslopesandlittleinleewardslopes;abundantincoastlandandlittleinis lands.Therearemainly 4 pluvialregionsand 2littlerainfallregions.The 4pluvialregionswithprecipitat…     

湖北旅游资源特征与分区

本文在分析湖北省旅游资源的赋存状况和特征基础上，提出了湖北旅游的分区方案，包括鄂东综合旅游，鄂中名胜古迹，鄂西北山岳风光和鄂西南峡谷溶洞与民俗风情４大旅游区，旨在为湖北区域旅游开发与产业布局提供理论依据。     

岷江上游半干旱河谷土壤成土特征研究：以大沟流域为例

岷江上游半干旱河谷位于新构造运动活动带，其土壤形成和发育过程有着鲜明的区域特征。本文结合该区域的自然地理特点，综合分析各成土因素和土壤性状，对该区域土壤的成土特征进行了深入的分析和研究。     

金沙江对硫酸的缓冲性能分析

本文分析了金沙江对硫酸的缓冲特征，建立了江水的缓冲曲线方程，并且验证了此方程的有效性，证明用此方程预测硫酸进入金沙江后江水pH值的变化情况，其预测准确度在0.2个pH单位内。     

HISTORICAL TRENDS IN SEDIMENTATION RATES AND SEDIMENT PROVENANCE,FAIRFIELD LAKE,WESTERN NORTH CAROLINA1

Sedimentation rates and sediment provenance were examined for lacustrine sediments deposited in Fairfield Lake, western North Carolina, during the past 111 years. Stratigraphic, radionuclide, and cartographic data indicate that sedimentation rates have increased several fold during the past three decades in response to localized development. The magnitude of increased sedimentation was surprising given limited development within the basin: 0.12 to 0.68 buildings/ha in 2000 in those parts directly delivering sediment to the dated cores. Thus, the analysis illustrates the potential sensitivity of watersheds in the southern Appalachians to changes in land cover. An approach that combined geochemical fingerprinting with sediment mixing models was subsequently evaluated to determine its ability to accurately estimate the contribution of sediment from (1) major bedrock formations that underlie the watershed and (2) potential sources associated with four land cover categories. Sediment sources in both analyses proved difficult to geochemically fingerprint to greater than 90 percent accuracy using data on acid‐soluble metals and selected isotopes of lead (Pb). The relative contributions of sediment from delineated sources, estimated by the mixing models, generally corresponded with known temporal and spatial patterns of land cover. However, the models were plagued by two significant problems — the chemical alteration of sediments as they were transported through upland streams to depositional sites within the lake and the loss of elemental mass. Thus, future investigations using the fingerprinting approach in this area of intense weathering, and presumably others, will need to modify the existing methods to more accurately elucidate changes in sediment provenance related to development.