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１９９４年９月应加拿大Ｃａｍｅｃｏ公司邀请，前往洽谈金矿勘查合作事宜，并顺便考察了萨斯喀彻温省北部前寒武纪地盾区内的２个富铀矿床和１个金矿床，获得了一些新的信息，在此作一简介，以供参考 相似文献
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巨型构筑物地基中软弱夹层物理力学参数的反演分析 总被引：1，自引：0，他引：1
以大坝为参照物,对巨型建（构）筑物地基中软弱夹层的物理力学参数Ｅ、μ、ｃ、ψ进行反演分析,通过建立两个目标函数,合理模拟大坝及基岩软弱夹层的弹－塑性蓄水加载过程,基于罚函数、复合形法等优化手段,对在工程中能否利用反分析法得到合理的Ｅ、μ、ｃ、ψ作了较好的论证。 相似文献
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江苏溧水火山岩盆地内生金属矿床定位模式及找矿思路夏嘉生（江苏地矿局信息所，南京，２１００１８）关键词：火山岩盆地，铜矿、金矿，内生金属矿床，江苏。ＬｏｃａｔｉｏｎＭｏｄｅｌａｎｄＰｒｏｓｐｅｃｔｉｎｇＭｏｄｅｌｏｆＥｎｄｏｇｅｎｅｔｉｃＭｅｔａｌｌｉ... 相似文献
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周口店地区第四纪哺乳动物群的演化与环境变迁探讨 总被引：2，自引：0，他引：2
讨论了Ａｌｉｌｅｐｕｓａｎｎｅｃｔｅｎｓ、ＨｙｐｏｌａｇｕｓｂｒａｃｈｙｐｕｓＬｅｐｕｓｓｐ．、Ｓｃｉｕｒｏｔａｍｉａｓｐｒａｅｃｏｘ、ＡｌｌｏｃｒｉｃｅｔｕｓｔｅｉｌｈａｒｄｉＣｒｉｃｅｔｉｎｕｓｖａｒｉａｎｓ、Ｈｙｐｅｒａｃｒｉｕｓｙｅｎｓｈａｎｅｎｓｉｓ、Ａｌｌｏｐｈａｉｏｍｙｓｃｆ．ｐｌｉｏｃａｅｎｉｃｕｓ、Ｐｒｏｅｄｒｏｍｙｓｃｆ．ｂｅｄｆｏｒｄｉ、Ｃｈａｒｄｉｎｏｍｙｓｎｉｈｅｗａｎｉｃｕｓ、Ｍｕｓｃｆ．ｍｕｓｃｕｌｕｓ和Ａｐｏｄｅｍｕｓｄｏｍｉｎａｎｓ的地史分布。根据哺乳动物群的分析与对比，得出第１８地点为早更新世早期，第１２地点、东洞地点为早更新世中期，第９地点、西洞地点为早更新世晚期，第１３地点为早更新世末期至中更新世初期，第１、２、５、６、１１、１０、２１、２３及上店洞地点为中更新世，新洞为中更新世晚期至晚更新世早期，东岭子洞为晚更新世，山顶洞为晚更新世晚期。还讨论了周口店地区一些主要第四纪哺乳动物群的生态类型特点，第四纪的气候波动及生态环境变迁。 相似文献
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河北唐山—卢龙地区寒武－奥陶系界线地层的牙形刺及其重要属种的演化 总被引：1，自引：0，他引：1
本文对唐山和卢龙地区寒武－奥陶系界线地层中的牙形刺再次进行研究，厘定了过去报道的一些重要属种，并对最具地层意义的Ｃｏｒｄｙｌｏｄｕｓ的几个种的演化进行了分析。指出了该属的两个进化系列，第一支进化系列是Ｅｏｃｏｎｏｄｏｎｔｕｓｎｏｔｃｈｐｅａｋｅｎｓｉｓ－Ｃｏｒｄｙｌｏｄｕｓｐｒｉｍｉｔｉｖｕｓ－Ｃ．ｐｒｏａｖｕｓ－Ｃ．ｃａｂｏｔｉ－Ｃ．ｉｎｔｅｒｍｅｄｉｕｓ－Ｃ．ａｎｇｕｌａｔｕｓ；而另一支则是Ｅｏｃｏｎｏｄｏｎｔｕｓｎｏｔｃｈｐｅａｋｅｎｓｉｓ－Ｃ．ｃａｂｏｔｉ－Ｃ．ｐｒｏｌｉｎｄｓｔｒｏｍｉ－Ｃ．ｌｉｎｄｓｔｒｏｍｉ－Ｃ．ｐｒｉｏｎ。本文对寒武－奥陶系界线的几个划分方案也进行了简单的讨论 相似文献
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以技术市场为导向开展新形势下的地质科技情报工作张晶（地矿部信息院１０００３７）主题词：技术市场，地质科技情报，服务ＴａｋｉｎｇＴｅｃｈｎｏｌｏｇｉｃａｌＭａｒｋｅｔＩｎｆｏｒｍａｔｉｏｎａｓａＧｕｉｄｅａｎｄｕｎｄｅｒｔｈｅＮｅｗＳｉｔｕａｔｉｏｎｔ... 相似文献
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关于宇宙的起源问题 ,人们通常认为是宇宙形成于大约 1 5 0亿年的一次大爆炸。英国自然杂志近期报道又出现了一些新的观点 ,引发了激烈的争论。宇宙不是一次大爆炸形成的 ,根据新的数学模型研究认为 ,宇宙一直经历着无休止的产生和消亡的循环过程。这一新的循环模型 (ｃｙｃｌｉｃｍｏｄｅｌ)的建立 ,搬开了前人宇宙形成理论中一直存在的绊脚石 ,即物理学无法解释的大爆炸前的宇宙存在形式。因为这一模型所依据的新数学理论尚待进一步完善 ,许多宇宙学家对该假说持慎重态度 ,还有一些持批评态度。循环理论的创立者英国剑桥大学的ＮｅｉｌＴ… 相似文献
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GIS and multi-criteria analysis to select potential sites of agro-industrial complex 总被引：1，自引：1，他引：0
Houda Sahnoun Mohamed Moncef Serbaji Boubaker Karray Khaled Medhioub 《Environmental Earth Sciences》2012,66(8):2477-2489
The selection of the potential sites to the creation of an agro-industrial complex requires a large amount of spatial information. Geographical information systems are capable of managing this information, providing the ability to integrate multiple layers of information and deriving new ones. This study incorporates environmental, social, economic, geological and infrastructural data. A multi-criteria analysis is performed to select the potential sites to the creation of an agro-industrial complex in the city of Sfax (the southern coast of Tunisia). The comparison by pair method adopted in this paper, based on a linear combination pondered after having assigned to every factor of decision a coefficient of level-headedness, creates many scenarios among which we selected the sustainable development one. This scenario assigned the highest weight to the economical, environmental and social factors (0.3 for each factor), which shows the presence of nine suitable sectors for the creation of an agro-industrial complex. The ELECTRE method enabled us to make a site ordering for the identification of the most three appropriate sites. 相似文献
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高放废物处置库预选场地地学信息库的建立 总被引：1，自引：0，他引：1
本文以高放废物处置库预选场地甘肃北山玉门镇地学信息库的建立为例,详细阐述了地理信息系统在高放废物地质处置中的应用,并在此基础上分析了其应用前景,为不同层次的管理、科研人员提供了全新思路;介绍了将地理信息系统技术引入图件和资料管理的优点。 相似文献
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Subsurface dams constitute an affordable and effective method for the sustainable development and management of groundwater resources when constructed on suitable sites. Such dams have rarely been constructed in crystalline rock areas and to best of our knowledge, geographic information system (GIS) has never been used in any methodology for locating suitable sites for constructing these dams. This paper presents a new methodology to locate suitable sites for the construction of subsurface dams using GIS software supported by groundwater balance modelling in a study area Boda-Kalvsvik, Sweden. Groundwater resources were calculated based on digitized geological data and assumptions regarding stratigraphic layering taken from well archive data and geological maps. These estimates were then compared with future extractions for domestic water supply using a temporally dynamic water balance model. Suitability analyses for subsurface dams were based on calculated topographic wetness index (TWI) values and geological data, including stratigraphic information. Groundwater balance calculations indicated that many of the most populated areas were susceptible to frequent water supply shortages. Of the 34 sub-catchments within the study area: ten were over-extracted, nine did not have any water supply demand at all, one was self-sufficient and the remaining 14 were able to meet the water supply demand with surplus storage capacity. Six suitable sites for the construction of subsurface dams were suggested in the vicinity of the over-extracted sites based on suitability analysis and groundwater balance estimates. The new methodology shows encouraging results for regions with humid climate but having limited natural water storage capacities. The developed methodology can be used as a preliminary planning step for subsurface dam construction, establishing a base for more detailed field investigations. 相似文献
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Huang Bolin Chen Lide Peng Xuanming Liu Guanning Chen Xiaoting Dong Haogang Lei Tianci 《Landslides》2010,7(1):1-11
In 2007 and 2008, six big damaging rockfalls occurred at four sites in Wu Gorge, the second gorge of the Three Gorges, China.
Detailed surveys and aerial-photographic interpretation identified 104 potentially dangerous rock masses. This paper reviews
previous rock-mass risk ratings, examines dangerous rock-mass structure and presents a new assessment system for rockfall
risk (ASRFR) in the Wu Gorge area. The ASRFR considers 15 factors: seven factors for hazard and eight factors for consequence.
Relative importance weights for these factors are ascertained using an analytic hierarchy process. Using an equation to calculate
the risk, the 104 dangerous rock masses were divided into three risk groups: high risk (33 sites), medium risk (33 sites)
and low risk (38 sites). The ASRFR analysis can be used to divide the shipping route through the Wu Gorge into seven courses
each of one of three classes: safe-route regions, yellow-alarm regions and red-alarm regions. The system provides geological
information and a rockfall-risk management tool for local government and the shipment-route department. 相似文献
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《Quaternary Science Reviews》2003,22(10-13):1085-1092
Climate changes over the Holocene have directly impacted on both coastal processes and human use of coastal areas. This paper presents results from the dating of wind blown sand deposits collected from coastal and archaeological sites in Northern Scotland. Archaeological remains are frequently found interspersed with sand deposits and represent distinct periods of occupation of settlement sites within the local landscapes. In some cases storm events sufficiently inundate the sites with sand to result in periodic abandonment. Storm events can also have dramatic results on adjacent rock coastlines, with storm boulder ridges emplaced by large waves, burying sand deposits on cliff-top sites. Work has been undertaken using a quartz SAR protocol to date sand deposition at two archaeological sites in Orkney and a cliff-top site in Shetland. These dates provide chronological information, which help to construct regional chronologies of climatic instability and environmental change and allow the SAR-OSL method to be assessed as an accurate sediment dating tool in this context. 相似文献
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Maria Danese Nicola Masini Marilisa Biscione Rosa Lasaponara 《Central European Journal of Geosciences》2014,6(1):42-55
The use of GIS and Spatial Analysis for predictive models is an important topic in preventive archaeology. Both of these tools play an important role in the Support Decision System (SDS) for archaeological research and for providing information useful to reduce archaeological risk. Over the years, a number of predictive models in the GIS environment have been developed and proposed. The existing models substantially differ from each other in methodological approaches and parameters used for performing the analysis. Until now, only few works consider spatial autocorrelation, which can provide more effective results. This paper provides a brief review of the existing predictive models, and then proposes a new methodological approach, applied to the neolithic sites in the Apulian Tavoliere (Southern Italy), that combines traditional techniques with methods that allow us to include spatial autocorrelation analysis to take into account the spatial relationships among the diverse sites. 相似文献
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《地学前缘(英文版)》2023,14(2):101494
Permeable reactive barriers (PRBs) are used for groundwater remediation at contaminated sites worldwide. This technology has been efficient at appropriate sites for treating organic and inorganic contaminants using zero-valent iron (ZVI) as a reductant and as a reactive material. Continued development of the technology over the years suggests that a robust understanding of PRB performance and the mechanisms involved is still lacking. Conflicting information in the scientific literature downplays the critical role of ZVI corrosion in the remediation of various organic and inorganic pollutants. Additionally, there is a lack of information on how different mechanisms act in tandem to affect ZVI-groundwater systems through time. In this review paper, we describe the underlying mechanisms of PRB performance and remove isolated misconceptions. We discuss the primary mechanisms of ZVI transformation and aging in PRBs and the role of iron corrosion products. We review numerous sites to reinforce our understanding of the interactions between groundwater contaminants and ZVI and the authigenic minerals that form within PRBs. Our findings show that ZVI corrosion products and mineral precipitates play critical roles in the long-term performance of PRBs by influencing the reactivity of ZVI. Pore occlusion by mineral precipitates occurs at the influent side of PRBs and is enhanced by dissolved oxygen and groundwater rich in dissolved solids and high alkalinity, which negatively impacts hydraulic conductivity, allowing contaminants to potentially bypass the treatment zone. Further development of site characterization tools and models is needed to support effective PRB designs for groundwater remediation. 相似文献
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Ulrich Noseck Eva-Lena Tullborg Juhani Suksi Marcus Laaksoharju Václava Havlová Melissa A. Denecke Gunnar Buckau 《Applied Geochemistry》2012
This paper gives an overview of the behaviour of U in two natural systems, the Forsmark site (a granitic system) in Sweden and the Ruprechtov site (a Tertiary sedimentary system) in the Czech Republic, which have been investigated in the frame of the FUNMIG project. It is not a full review paper on U geochemistry. It shows how different approaches and methods have been used to derive information on U solubility and speciation, on characteristics of key processes as well as on timescales of these processes and accordingly information on the long-term stability of U phases in the natural systems. The results are set in a wider context by relation to selected results from other sites. 相似文献
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Our recent comprehensive review of the Permian-Early Triassic tetrapod tracksites from South Africa includes a revision of the ichnotaxonomy and the incorporation of a large quantity of new material. The paper also discusses, in light of the revised ichnotaxonomy and palaeontology of several sites, trackmaker attribution and the biostratigraphy of Permian-Early Triassic tetrapod tracks. Precise information about the fossiliferous localities was provided where possible and when sites were relocated. Three footprint associations were described (FA I-III) and highlight their potential stratigraphic value. The youngest (FA III) was recognized at four different localities and is likely Induan in age. A recent comment by Gastaldo and Neveling (2019) regarded one of these FA III localities, the Bethel tracksite, which received criticism for its unclear geographic placement and its stratigraphic position. Further comments included a discussion of the possible palaeoecological interpretation of this tracksite. In replying to these queries, we provided more precise geographic and stratigraphic information, confirming the occurrence of this tracksite ~15 m above the faunal transition which we consider to be currently coinciding with the Permian-Triassic boundary (PTB). Palaeoecological inferences are herein further clarified. 相似文献