且末县克孜勒萨依金矿地球化学特征     

张永生  刘铭锋  杨海英 《新疆地质》2007,25(2):149-153

克孜勒萨依金矿经地表地质工作和平硐控制,初步确定是一个蚀变岩型的金矿,主矿体长度在100m左右,宽度2~3m,金平均品位5×10~(-6),通过本次工作预测深部有隐伏矿体存在,有一定的开采价值,有进一步进行深部工程控制的必要.  相似文献   

The Natural Hazards Theme of the International Year of Planet Earth     

Tom Beer 《Natural Hazards》2007,42(3):469-480

The United Nations has declared 2008 to be the International Year of Planet Earth. It is being organised under the auspices of the International Union of Geological Sciences and UNESCO. Planning for the International Year of Planet Earth has consisted of establishing 10 major science themes including Hazards. The Hazards Theme is centred around the following key questions: (1) How have humans altered the geosphere, the biosphere and the landscape, thereby creating long-term changes detrimental to life and the environment and triggering certain hazards, while increasing societal vulnerability to geophysical (geological and hydrometeorological) hazards? (2) What technologies and methodologies are required to assess the vulnerability of people and places to hazards and how might these be used at a variety of spatial scales? (3) How do geophysical hazards compare relative to each other regarding current capabilities for monitoring, prediction and mitigation and what can be done in the short-term to improve these capabilities (4) What barriers exist to the utilisation of risk and vulnerability information by governments (and other entities) for risk and vulnerability reduction policies and planning (including mitigation) from each of the geophysical hazards? Following the 26 December 2004 Indian Ocean Tsunami and the UN World Conference on Disaster Reduction held in Kobe, Japan in January 2005, the International Council for Science (ICSU) decided to establish a major research programme and initiative on Natural and Human Induced Environmental Hazards and Disasters that will co-operate with the Hazards theme of the International Year and continue through to 2011.  相似文献   

《江苏省地图集》电子版的设计与实现     

钱郭锋  张雷  蒋淼  虞泰泉 《现代测绘》2007,30(2):47-48

探讨地图集电子版的设计原则,从《江苏省地图集》电子版的设计与实现入手,分析地图集电子版的设计思路和技术方案.阐述多媒体电子地图集的解决方案.  相似文献   

湘东北—桂北中元古界岩石地球化学特征     

金文山  赵风清  王祖伟  甘晓春 《南方国土资源》1998,(1)

湘东北—桂北中元古代冷家溪群和四堡群的变玄武岩类显示过渡型拉斑玄武岩类的地球化学特征,变砂岩类和变泥岩类（绢云板岩类）显示大陆边缘的砂岩类和泥岩类的地球化学特征。根据岩石地球化学和沉积相（低密度流复理石建造）特征,推测湘东北冷家溪群和桂北四堡群主要形成于大陆边缘深水环境。  相似文献   

柞水银铅矿地表径流沉积物中污染物相态分析     

李英  曹军骥 《地球科学与环境学报》1998,20(1):9

采自柞水银铅矿地表径流６个沉积物样品,用连续提取法提取了金属元素的５种化学相态（可交换相、碳酸盐相,铁锰氧化物结合相,有机质－硫化物结合相及残渣相）,测定了各相中铜铅锌含量,分析了其分布特征。结果表明,在河流沉积物中,铜主要以残渣相和有机质相存在,铅、锌主要为铁锰水合氧化物相和碳酸盐相。在此基础上,对矿山开采中环境影响进行了讨论。  相似文献   

Liner design for waste disposal sites   总被引：5，自引：0，他引：5  

A. Bouazza  W. F. Van Impe 《Environmental Geology》1998,35(1):41-54

 Since the beginning of the 1980s waste disposal has become a particularly sensitive issue. This has led to the development of new legislations in the European Community and internationally which resulted in an array of regulations concerning landfill liner design. This paper comments on different "engineered" containment methods with particular reference to landfill liner design. Suggestions based on the review of the different methodologies are given and a case study is presented. Received: 25 February 1997 · Accepted: 16 December 1997  相似文献   

The main structure and tectonic features of the Chernorud-Mukhor site on the western shore of Lake Baikal from TEM and SP measurements     

Nikolai Kozhevnikov  Bülent Tezkan   《Journal of Applied Geophysics》1998,39(4):237-250

Transient electromagnetic (TEM), self-potential (SP) and geoelectrical mapping measurements were carried out at the Chernorud-Mukhor site in the Priolkhonje area on the western shore of the Lake Baikal. All measurements were made along several profiles across the main strike of the regional Primorsky fault. TEM measurements were carried out in a time range from a few tens of microseconds to several tens of milliseconds. The most important result of the 1D modelling of TEM soundings is the discovery of nearly horizontal boundaries that divide high resistive overlying and well conducting underlying rocks. The resistivity of the former is in the range from 100 Ωm to 1000 Ωm, while the resistivity of the latter varies from less than 1 Ωm to several tens of Ωm. This good conductive zone could also be verified by geoelectrical mapping using Schlumberger array (AB/2=100 m). Due to high conductivity of the underlying rocks only the upper boundary of the conductive layer could be determined by TEM soundings. A regional SP anomaly with amplitude of about −450 mV has also been observed above the low resistivity zone indicating the electron nature of its conductance. Geologically, the conductive zone is represented by a graphite-bearing layer within the region of archean rocks. Since that layer extends over a large area, it may be used as a key in studying structures and tectonics of the Priolkhonje area. A 1D TEM geoelectric section shows a wide, gently sloping syncline as a probable base structure of the Chernorud-Mukhor site. Neotectonic faults divide the syncline into vertically displaced blocks that form a wide complicated graben with a total amplitude of about 250 m.  相似文献   

First international payment for marine ecosystem services: The case of the Banc d’Arguin National Park,Mauritania     

Thomas Binet  Pierre Failler  Pablo N. Chavance  Mohamed Abidine Mayif 《Global Environmental Change》2013,23(6):1434-1443

This article investigates whether the European Union-Mauritania fisheries agreement, which allocates part of the Europe's financial contribution to the conservation of marine ecosystems located within the Banc d’Arguin National Park, can be regarded as a payment for ecosystem service. A framework for qualification as such payment scheme was established based on an extensive literature review. The criteria identified for the qualification as a payment to ecosystem service pertain to: (1) the definition of the ecosystem service(s) involved; (2) the mechanism involved by the payment; and (3) the nature of the transaction. Interviews with local beneficiaries and subsequent data analysis led to the conclusion that this mechanism could be regarded as a payment to ecosystem service and so, through the European Union-Mauritania Fisheries agreement, the European Union were investing to protect local fish resources that could be exploited by its fishing fleet. This agreement, involving the first International Payment to Ecosystem Service of this kind, marks an important step towards better consideration of marine conservation in international public policy and foreign fishing policy in particular. However, this payment is small when compared to revenues generated through the exploitation of developing countries’ fishing grounds by fishing countries. Nevertheless it opens the door for more detailed applications of payment to ecosystem service schemes to other ecosystems contexts, and can provide a useful alternative source of financing of marine biodiversity conservation.  相似文献   

Geochemistry and pollution of shallow aquifers in the Mafraq area, North Jordan     

Nadir Eraifej  Nizar Abu-Jaber 《Environmental Geology》1999,37(1-2):162-170

 Chemical data are used to clarify the hydrogeological regime in the Mafraq area in northern Jordan, as well as to determine the status of water quality in the area. Groundwater from the shallow aquifer in the Mafraq area can be divided into two major groups according to geographical locations and chemical compositions. Water in the basaltic eastern part of the study area is characterized by the dominance of chloride, sulfate, sodium, and potassium, whereas waters in the limestone aquifers in the west are dominated by the same cations but have higher concentrations of bicarbonate. Stable isotopes show that the shallow aquifers contain a single water type which originated in a distinct climatic regime. This water type deviates from the Global Meteoric Water Line (MWL), as well as from the eastern Mediterranean meteoric water line. The waters are poor in tritium, and thus can be considered generally older than 50 years. Chemical mass balance models suggest that water is moving from the west towards the north of the study area. This suggests that waters from the different basins are separated from each other. Degradation of water quality can be attributed to agricultural fertilizers in most cases, although the waste-water treatment plant at Khirbet es Samra is a contributor to pollution in the southwestern part of the study area. Received: 20 August 1997 · Accepted: 3 February 1998  相似文献   

测绘技术进步状况和2010年定位方向预测分析     

郭淑香  刘长生 《地理信息世界》2000,(1)

该文是对测绘技术进步对经济发展的作用进行定量分析，并运用经济、数学、统计等科学方法，依据产出增长数学方程，对测绘生产单位产值增长、技术进步速度和水平等进行测算，预测２０１０年测绘生产发展规模、技术水平等，提出对策建议，供管理决策者及部门参考。  相似文献