矿产资源预测的精度评价

针对目前矿产资源预测理论及技术方法多种多样,却没有明确的对其预测精度进行评价的现状,从预测精度的影响因素方面考虑,提出了一种定量评价预测精度的方法.并应用此法对陕西省潼关县Q8金矿脉西段隐伏矿三维预测进行精度评价,与矿床开采实践的结论一致,证明了该方法的有效性.对矿产资源预测精度进行评价,能够使预测结果科学有效地指导探...     

基于网格单元的总合式和非总合式结合的区域矿产资源潜力评价方法

区域矿产资源潜力有总合式评价和非总合式评价两大类方法.总合式评价方法简便易行,可以得到一个区域的资源潜力总量的估计,但是没有其在区域中的空间位置信息,区域矿产资源潜力评价早期主要是用总合式评价方法.随着资料数据的积累,特别是计算机和GIS技术的应用,能给出空间位置信息的非总合式评价越来越多的用于区域矿产资源潜力评价.非总合式评价主要把区域划分成同形等大的单元,在圈定成矿远景区单元基础上,用类比方法对成矿远景区单元进行矿产资源潜力数量预测评价.总合式矿产资源潜力评价是区域矿产资源潜力评价的主要方法,可以对区域内潜在的矿产资源量进行预测,但是只有一个总量,没有区域内矿产资源空间分布信息,不能结合各局部空间具体情况进行各种环境经济社会评价,因此需要将其预测的资源量空间定位化.非总合式矿产资源潜力评价虽然能够定位,但因其是用控制单元的探明资源量进行类比外推,所以无法对已知矿产资源量的单元内潜在的矿产资源量进行预测.提出了用基于网格单元的总合式和非总合式方法结合的矿产资源潜力评价方法,解决了总合式方法单元资源量预测值的空间定位和分配问题.并且以云南铅锌矿为例进行了计算,既得到了总量也得到了其空间分布量,修正了非总合式预测方法的不足,特别适用于对矿产资源进行环境、经济、社会等评价或者联合评价.以云南铅锌矿产资源潜力评价为实例进行了应用,得到初步结果.      

大数据思维下的矿产资源评价

以大数据时代的预测思维方法,结合重要矿产资源潜力评价具体工作,探索了矿产资源预测评价的基本理论基础。认为大数据的相关性预测方法和常用的综合信息矿产预测方法是一致的,矿产预测模型理论、多学科信息相关性分析、预测地质求异理论、矿产区域趋势分析方法是矿产资源评价的四项基本理论。总结了在数字化、信息化时代矿产资源预测评价的主要工作流程。建立数字化预测数据平台、根据预测矿产模型进行数据清洗、编制预测要素图件、建立预测模型、圈定预测靶区和成矿远景区、进行资源潜力估算等是预测评价的基本任务与流程。     

贵州省矿床式与矿产预测类型及预测方法类型

贵州矿产资源丰富,类型多样,分布广。为了摸清我省矿产资源家底,为矿产资源保障能力和勘查部署决策提供依据,特开展全省矿产资源潜力评价工作。为了顺利完成该项工作,使该项工作的统一性、规范性,要对全省矿产进行矿床式、矿产预测类型、矿产预测方法类型进行划分,本文对贵州省矿产进行矿床式、矿产预测类型、矿产预测方法类型进行初步划分。     

应用GIS进行矿产资源的评价预测

从GIS技术的发展出发,介绍当前GIS在矿产资源评价预测方面的应用技术,并对几种流行的方法进行对比分析,总结它们的各自特点及适用条件。最后,展望应用GIS新技术进行矿产资源网络评价预测的前景。     

基于GIS的矿产资源评价信息系统分析与设计

在MapGIS的基础上对矿产资源评价系统进行系统需求研究,总结出矿产资源评价信息系统的总体结构,给出了矿产资源评价中经常用来解决资源量的定位问题的数学模型——矿床定位预测特征分析模型,并对矿产资源评价系统进行了结构设计。     

应用GIS进行矿产资源评价现状及技术方法研究方向

ＧＩＳ作为一种有效的矿产资源评价预测方法,在国外已被广泛应用,在对国内外应用ＧＩＳ进行矿产资源评价的现状、技术方法进行探讨的基础上,重点介绍了新疆ＧＩＳ的发展现状,并就新疆进行ＧＩＳ矿产资源评价的技术方法、技术思路进行了研究与探讨。     

沉积型铝土矿预测方法及其影响因素——以贵州省铝土矿为例

以全国矿产资源潜力评价技术要求为基础,以贵州省铝土矿预测方法为实例,在简述国内沉积型铝土矿矿床类型、特征和预测方法的基础上,重点论述了地质单元法、网格单元法中划分预测单元、拟选预测要素和赋值的方法,以及地质填图精度、矿床特征、地-物-化-遥等信息对矿产预测的影响。该网格单元法考虑因素较全面,应用信息较充分,预测精度达到了矿体-矿床级。     

美国矿产资源评价状况

矿产资源评价包括对已发现矿床的分类与评价以及预测尚未发现的矿床资源量和未知的矿床类型的资源量两个方面。本文介绍美国地质调查局九十年代进行的矿产资源评价专项研究的方法、技术和部分评价成果。我们相信这些方法和技术在我国的矿产资源评价工作中是可以借鉴的。     

矿产资源定量评价在火山岩铀资源中的应用研究

在详细分析各种勘查资料、综合利用地质科研成果的基础上开展预测与评价，查明研究区内矿产资源总量及其质量状况，对科学地指导进一步的矿产普查，勘探和深部评价工作，合理开发矿产资源，保证矿产资源的可持续利用，无疑具有十分重要的意义。矿产资源预测与定量评价是涉及多层次，多因素的综合决策问题，已经发展和应用了许多方法和技术来进行这方面的研究。随着计算机技术和信息处理技术的发展，近年来矿产资源定量评价向综合化、模式化，定量化，可视化、动态化，系统化转移。文章根据实例分析，研究了矿产资源预测及质量评价的某些方法。在已有的成矿地质模型基础上，利用信息量法和逻辑矢量长度法等方法筛选与成矿密切相关的地质变量。根据它们对成矿的贡献，建立成矿有利度预测模型并依此圈出有利成矿区。运用丰度法，吉波夫法和逆推法等方法估算预测区的资源总量，以各成矿区的成矿有利度和面积为权将资源总量进行分配，经保矿系数校正后，圈定远景区并对预测资源进行质量评价。     

The terrestrial fauna of the Late Triassic Pant-y-ffynnon Quarry fissures,South Wales,UK and a new species of Clevosaurus (Lepidosauria: Rhynchocephalia)

Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco.     

The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts

The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H₂O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H₂O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species.     

Quaternary stresses revealed by calcite twinning inversion: insights from observations in the Savonnières underground quarry (eastern France)

Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ₁ roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003).     

HYDROGEOLOGY

正20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level     

METAMORPHIC PETROLOGY

正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7),     

SERIALS

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GEOPHYSICAL EXPLORATION

正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci-     

QUATERNARY GEOLOGY & GEOMORPHOLOGY

正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli-     

PETROLEUM GEOLOGY

正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.)     

GEOCHEMISTRY

正20142002 Wei Hualing(Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang065000,China);Zhou Guohua Element Content and Mineral Compositions in Different Sizes of Soil in Tongling Area,Anhui Province(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(11),2013,p.1861