共查询到20条相似文献，搜索用时 59 毫秒
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老湾—鸿仪河金矿带,经初步普查勘探已构成大型金矿,并伴随有强度高、规模大,浓度分带清晰的金(198km~2)、银(100km~2)地球化学异常,对扩大金矿带普查和外围普查找矿,提供了极为重要的地球化学依据。本文拟从地球化学特征的研究入手,着重对矿带地层及岩石中微量元素的分布、分配;矿区地质及地球化学异常特征;地球化学模型及评价指标进行讨论。同时为在该矿带进一步普查找矿,扩大矿床规模进行了预测评价。 相似文献
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探讨山东牟平-乳山成矿带金青顶金矿区成矿元素地球化学场三维分布特征,总结成矿规律,建立三维综合找矿模型,为金矿深部成矿预测提供更为丰富的信息,指导矿山生产与发展方向。针对金青顶矿区深部找矿问题,在全面收集已有地质、矿产资料的基础上,结合野外实地调查,应用三维建模与可视化技术、构造叠加晕及地质统计学理论与方法,构建矿床地质、地球化学场等方面的三维综合找矿模型,将金青顶矿床的预测评价研究拓展到三维空间,揭示了区内成矿地质特征和地球化学异常表征,据此探讨了矿体及地球化学场的三维空间分布规律。并在此基础上,开展了矿区的地质-地球化学综合信息分析与深部预测评价,减少了深部预测的不确定性。矿体三维模型显示,矿体呈现中间宽两端窄的形态,有向深部尖灭的趋势。三维地球化学场分布特征显示,Au、As、Sb、Hg、Cu、W、Sn、Co、Ni元素及组合因子主要分布于矿体浅部,向深部呈现元素场强度下降的趋势;Mo、Bi元素主要分布于矿体深部;Ag、Pb、Zn元素分布较分散,存在多个矿化中心。地质-地球化学三维模型显示,组合因子高得分区域与组合矿物富集区域相符合,Au成矿作用主要发生于矿体浅部,深部成矿作用减弱。应用格里戈良分带指数法求取Ⅱ号金矿体的原生晕垂向分带序列为Sb-Cu-Ni-Au-Sn-W-Hg-As-Co-Ag-Zn-Pb-Mo-Bi,该序列与单一期次成矿垂向分带序列进行对比无明显反常现象,指示Ⅱ号矿体当前开采深度以下成矿潜力不高。研究结果显示,在综合找矿模型指导下,基于三维地球化学空间场晕模型的三维地质、地球化学异常信息的展示、提取与综合分析,可以有效地评价深部成矿潜力,为深部成矿预测研究提供了新思路,有利于指导矿山工作的部署。综合分析认为金青顶Ⅱ号主矿体在-1 200 m以下找矿潜力一般,不宜继续进行大规模的深部探矿。 相似文献
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山西东腰庄金矿是我国典型的绿岩带型金矿床之一,主要赋存于新太古代五台群鸿门岩组浅色变质绿片岩中,含矿带岩性主要为硅化绢云钠长片岩和绢云钠长片岩,层控特征明显。本次建立了东腰庄金矿床地质-地球物理-地球化学找矿模型,并运用岩石地球化学勘查、电法勘探,在东腰庄金矿外围勘查区圈定化探异常4处、激电异常2处,其中化探1号多元素综合异常与电法异常吻合较好,推测为矿致异常,通过激电测深,推测地质体形态为透镜体,埋深较浅。综合物化探方法利用绿岩带型金矿形成过程中元素迁移带来的原生地球化学异常,以及主要载金矿物-黄铁矿与围岩之间的电性差异,在此次找矿勘查过程中圈定了找矿靶区,取得了较好成效,为下步钻探验证工作提供了依据。 相似文献
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辽宁省位于华北地台北缘，其地质构造演化主要经历了地台基底形成（Ａｒ－Ｐｔ１）、盖层沉积（Ｐｔ２－Ｔ２）、地台活化（Ｔ３以后）三个阶段。按成矿物质来源、成矿环境、成矿作用、矿点矿化点空间分布规律及物化探异常特征，辽宁省可划分出朝阳县小塔子—北票迷力营子、义县红石砬子—刘龙台、葫芦岛市水泉、建昌县温杖子、凌源市柏杖子、阜新县地宫—建设、浑南、浑北、盖县猫岭、辽阳田家围子—凤城弟兄山及丹东市沿江等１２个金的主要矿化集中区。辽宁省今后的地质勘查工作应注意以下几点：（１）要更新找矿观念，注意寻找新类型和大型超大型矿床；（２）按区域成矿条件，选好找矿重点突破区；（３）精确地认识和了解已知矿床，坚持就矿找矿；（４）坚持“五统一”的部署原则，利用地质、地球物理及地球化学方法进行综合找矿。 相似文献
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青海沟里地区是我国西北的重要金矿矿集区，为进一步探寻沟里地区的找矿潜力，以该地区１∶５万水系沉积物地球化学测量数据为研究对象，采用平均值±３倍标准差的方法提取异常下限并圈定单元素异常与综合异常，结合研究区内的地质特征对圈定的异常进行了解释与评价。在圈定找矿远景区之前，首先对研究区内德龙金矿床的水系沉积物地球化学结构特征与地质特征进行了剖析，认为北西向的断裂与 Ａｕ、Ａｓ组合异常是金的有效的找矿标志，并构建了地质－地球化学找矿模型，以此为指导圈定出热龙金矿找矿远景区；之后对成矿地质条件较好的、以铜为主的（ＨＳ０１）综合异常进行了剖析，认为其有寻找铜多金属矿的潜力，圈定了龙洼卡鲁铜多金属矿找矿远景区。后续的异常查证工作中，在热龙找矿远景区内发现了金铅矿体，在龙洼卡鲁找矿远景区内发现了铜银矿体。本研究丰富了该区的矿产类型并为该区的找矿工作指明了新方向。 相似文献
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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. 相似文献
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《极地研究(英文版)》2014,(4)
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 相似文献
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《中国海洋大学学报(英文版)》2014,(4)
<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 相似文献
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《中国海洋大学学报(英文版)》2014,(6)
<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- 相似文献
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Massimo GRECO 《山地科学学报》2014,(6):1383-1384
<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 相似文献
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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. 相似文献
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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. 相似文献
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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. 相似文献
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《极地研究(英文版)》2014,(3)
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 comprchensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose is to publish achievements in fundamental research,applied 相似文献