应用GIS技术进行成矿预测的基本步骤及主要内容

在成矿预测中应用GIS,就是采用计算机技术和GIS系统 ,对已有各类矿产地质资料进行全方位的综合性分析与对比 ,研究成矿规律 ,圈定有利的找矿地带 ,进行成矿预测。本文根据近几年的工作经验 ,主要从应用者角度阐述成矿预测中应用GIS的基本步骤和主要内容。     

矿产预测中的不确定性评估方法与应用——以广西大瑶山矿区为例

由于矿床类型的多样性,矿床成因的复杂性,控矿因素的隐蔽性和找矿信息的多解性,成矿预测结果具有不确定性,并常常因人而异[1]。矿产预测评价是由多个阶段组成的复杂系统工程,每个环节都会产生不确定性,并且不确定性还会传播积累,致使技术评价的不确定性,最终会导致经济评价的不确定性。在找矿难度越来越大,矿业经济风险越来越突出的今天,对矿产预测评价中的不确定性加强认识,并尝试研究富有成效的不确定性评估方法已日显重要,它也是从根本上改进现行矿产预测评价方法的出路之一。本文先对矿产预测评价的特点作了简要说明,对技术评价的不确定性作了系统总结,并基于模糊集值统计的不确定性信息处理方法,提出了矿产预测中不确定性的一般评估方法,最后,以广西大瑶山西侧铜、铅、锌矿的预测评价为背景,对不确定性的评估方法作了应用分析。     

基于GIS的人工神经网络矿产预测系统设计及应用

利用地理信息系统(GIS)和人工神经网络(ANN)相结合，研究了基于GIS的人工神经网络矿产预测系统设计方案，实现了从地质变量优选到人工神经网络成矿预测结果图形显示的计算机自动化处理。在凤凰山矿田的应用显示，预测结果与现有矿床十分吻合，是矿产预测的有效方法。     

小盆地-野马泉地区基于MRAS的铁矿资源定位预测

通过介绍矿产资源综合评价系统(MRAS)在小盆地-野马泉地区对铁矿资源潜力进行综合评价后,对本区地质、矿产、物化遥等多元地学信息进行综合分析,从而总结出该地区铁矿资源的成矿规律,建立了找矿模型,并选用特征分析方法对该区铁矿资源进行定位预测。     

山东枣庄薛城地区稀土矿成矿规律研究及找矿预测

鲁南微山县郗山稀土矿为我国北方三大富轻稀土矿之一,也是山东省最重要的轻稀土矿产地,其周边地区是山东省重要的稀土矿远景找矿预测区。通过综合找矿方法在山东省枣庄市薛城地区开展矿产调查工作,发现了重要的稀土矿找矿线索,其成矿类型、成矿时期及成矿模式等与郗山稀土矿具有内在的时空、成因联系。该文以利用综合找矿方法在枣庄薛城地区稀土矿调查评价中的应用为实例,通过与郗山稀土矿的对比探讨,分析了该区稀土矿的成矿规律及成矿模式,并结合区域成矿背景进行了成矿预测,对鲁南地区今后稀土矿的调查评价工作具有指导作用。     

内蒙古赤峰塔西地区地质特征成矿规律与矿产预测

通过开展1∶5万区域矿产调查,对内蒙古赤峰市塔西地区的地质特征进行了综合研究,并总结了成矿规律,圈定了找矿靶区。该区处于天山-内蒙中部-兴安地槽褶皱区,内蒙古中部地槽褶皱系,苏尼特右旗晚华力西地槽褶皱带,哲斯-林西复向斜的西北翼,大兴安岭多金属成矿带之西南侧。区内主要出露二叠纪及侏罗纪地层;区域构造运动强烈,以脆性断裂为主,褶皱次之,主构造线为NE向;侵入岩多岩株状NE向展布,以形成于晚侏罗世和早白垩世的酸性、中酸性花岗岩为主。区内以银、铜、铅、锌、锡、钨、铁等金属矿产为主,划分为华力西晚期、印支期、燕山早期和燕山晚期等4个成矿期,以燕山晚期矿化作用最强,以充填交代为主。通过综合分析,将研究区划分二级成矿预测区4处,三级成矿预测区4处,为该区找矿工作指明了方向。     

基于GIS技术的胶东地区金矿地质异常成矿预测研究

该文基于胶东地区丰富的地质、物化探资料，通过建立GIS地质数据库，实现对各类地质空间数据综合分析，了解地质实体之间的相互关系，掌握各种地质异常与金矿分布的关系。运用MapGIS地理信息系统的空间分析方法，对金矿成矿与找矿密切相关的地质异常信息进行提取、叠加，形成组合地质异常，并运用组合地质异常进行金矿成矿预测研究。     

桂北江南古陆南缘拗褶带中铅锌矿产成矿信息特征及预测标志

本文通过研究与总结前人成果基础上.对桂北江南古陆南缘拗褶带中铅锌矿进行成矿预测。文中侧重探讨了该带的成矿环境、典型矿床特征、控矿因素和地球物理、地球化学特征;综合地、物、化成矿信息.总结提出了7 条成矿预测标志:采用特征分析法对该带中的19个成矿单元进行资源定性预测评价,认为其铅锌矿资源潜力较大,有找矿前景。     

区域矿产资源规划基础理论研究

区域成矿学是研究特定区域中的成矿环境、成矿条件、成矿过程、成矿类型及成矿演化的一门学科，是进行区域矿产预测、普查找矿和资源潜力评价的理论基础。     

Micromine三维建模在包金山金矿地质找矿中的应用

近年来随着数字化技术不断完善与提高,已经出现了数字化地球、数字化社会等新概念。因为Micromine矿业软件可以提供一个三维可视化的成矿预测综合分析平台,所以本文使用Micromine对包金山金矿各地质体进行三维建模。在构建矿区三维模型基础上,通过分解各地质体,单独研究各个地质体的空间分布和空间形态,通过多个不同地质体之间的组合,从三维空间上对其相互关系进行分析,以厘清各地质体对于成矿的影响,通过对矿体模型品位赋值,将金元素浓度在矿区的整体分布情况可视化,找出矿体矿化富集特征,总结矿区的成矿规律,最终对矿区进行全面的成矿预测。     

Preliminary study on plasma membrane fluidity of Psychrophilic Yeast Rhodotorula sp.NJ298 in low temperature

The ability of cell to modulate the fluidity of plasma membrane was crucial to the survival of microorganism at low temperature. Plasma membrane proteins, fatty acids and carotenoids profiles of Antarctic psychrophilc yeast Rhodotorula sp. NJ298 were investigated at -3 ℃, 0 ℃ and 8 ℃. The results showed that plasma membrane protein content was greater at -3 ℃ than that at 8 ℃, and a unique membrane polypeptide composition with an apparent molecular mass of 94.7 kDa was newly synthesized with SDS-PAGE analysis; GC analysis showed that the main changes of fatty acids were the percentage of unsaturated fatty acids (C18∶ 1 and C18∶ 2) and shorter chain saturated fatty acid (C10∶ 0) increased along with the decrease of the culture temperature from 8 ℃ to -3 ℃; HPLC analysis indicated that astaxanthin was the major functional carotenoids of the plasma membrane, percentage of which increased from 54.6±1.5% at 8 ℃ to 81.9±2.1% at -3 ℃. However the fluidity of plasma membrane which was determined by measuring fluorescence anisotropy was similar at -3 ℃, 0 ℃ and 8 ℃. Hence these changes in plasma membrane's characteristics were involved in the cellular cold-adaptation by which NJ298 could maintain normal plasma membrane fluidity at near-freezing temperature.     

Information for authors

正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprehensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose     

JOURNAL OF OCEAN UNIVERSITY OF CHINA

<正>Copyright Submfnion of a roanusatpt inks:that the work described has not been published before(exoept In the form of an abstrW or as part of a published lecture,review,or thesis);that it is not under consideration for publication elsewhere that its publication has been approved by ail     

Information for Authors

<正>The Journal of Ocean University of China(Oceanic and Coastal Sea Research)is a comprehensive academic quarterly sponsored by the Ocean University of China,published one volume per year.This journal is devoted to the publication of the theoretical and applied research results on oceanography and marine fisheries.The fieldcovered include the physical,chemical,biological,geo-     

Hydraulics and Hydrology in Mountain Areas

<正>The 35th IAHR World Congress was held in Chengdu,China from September 8 to September 132013.The title of the conference was:"The Wise Finds Pleasure in Water:Meandering through Water Science and Engineering".During the congress,1239 papers were presented in 139sessions for oral presentations and 7 sessions for poster presentations.After the Congress,a Committee was appointed to select some of the best papers presented at the Congress for publication,after a     

Sea ice thickness measurement in spring season in Bothnian Bay using an electromagnetic induction instrument

As an important component of the cryosphere,sea ice is very sensitive to the climate change.The study of the sea ice physics needs accurate sea ice thickness.This paper presents an electromagnetic-induction(EM) technique which can be used to measure the sea ice thickness distribution efficiently,and the successful application in Bothnian Bay.Based on the electromagnetic field theory and the electrical properties of sea ice and seawater,EM technique can detect the distance between the instrument and the ice/water interface accurately,than the sea ice thickness is obtained.Contrastive analysis of the apparent conductivity data obtained by EM and the value of drill-hole at same positions allows a construction of a transformable formula of the apparent conductivity to sea ice thickness.The verification of the sea ice thickness calculated by this formula indicates that EM technique is able to get reliable sea ice thickness with average relative error of only 12%.The statistic of all ice thickness profiles shows that the level ice distribution in Bothnian Bay was 0.4-0.6 m.     

Thermohaline structure inhomogeneity associated with polynia at the northern margin of Emery Ice-shelf

Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area.     

Phylogenetic analysis of cultivable bacteria isolated from Arctic sea-ice

Phylogenetic analysis based on 16S rDNA of 8 strains of cultivable bacteria isolated from Arctic sea-ice was studied.The results showed that strain BJ1 belonged to genus Planococcus,which was a genus of low mole percent G C gram-positive bacteria;strain BJ6 belonged to genus Burkholderia of β-proteobacteria and the rest 6 strain all belonged to γ-proteobacteria,of which strain BJ8 was a species of Pseudoalteromonas,strain BJ2-BJ5 and BJ7 were members of genus Psychrobacter.Phylogenetic analysis also indicated that bacteria of genus Psychrobacter of the isolates formed a relatively independent phylogenetic cluster in comparison with other bacteria belonged to genus Psychrobacter.     

Foreword

正Rapid changes of Arctic sea ice cover have been in the focus of the international climate research community in recent years.Quite a few of nations have completed a large number of related surveys and research projects in the Arctic Ocean.Up to now,China has performed six research cruises to the Arctic Ocean resulting in a significant volume of research output.Improved knowledge on the atmospheree-sea ice-ocean interactions in the Arctic is a