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青海大坂山地区水系沉积物测量元素组合分区 总被引：3，自引：0，他引：3
采用R型因子分析方法,对大坂山地区水系沉积物地球化学测量所取得的数据进行了统计处理,提取了具有代表性的6种因子组合类型,并利用各因子组合得分值进行了地球化学分区,制作了元素组合分区图,由此将工作区内全部水系沉积物样品所反映的地球化学统计信息以区块的形式反映在一幅图中,通过对该图的判读分析,不仅反映了不同地段中以相应元素组合类型为主的地球化学异常和其地质成因信息,也揭示出相应元素的背景含量特征,为从整体上认识该区地质、地球化学成矿特征提供了简明、清晰的参考资料. 相似文献
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密度分层组合成技术是通过对遥感图象密度层次的分折,以突出影象的结构信息为主的一种光孚图象处理方法。根据不同密度层次的多波段遥感图象具有不同类别结构的“信息丰度”的原理,通过对分层片的组合处理,比较成功地对影象信息进行增强和提取,从而获得较好的地质解译效果。实践表明,它不仅对构造解译是有效的,而且对地层、岩性解译也是可行的。在矿床、矿田构造解译力面,它可以获得一些以前没有被认识的信息。本文是基于对我国某铀矿田的卫片进行密度分层处理和解译,提出了矿田受菱形断裂构造块体控制的看法。它对认识铀矿田的构造特点,指导找矿是有一定意义的。 相似文献
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基于检波器组合各点为平面简谐波同相叠加的假设,地震勘探野外施工多将检波器组合作为压制噪音提高原始资料信噪比的一种主要手段,但实际野外地震地质因素难以满足假设条件,导致由多个检波器组合叠加的地震信号存在一定程度的畸变,进而影响到信号的振幅和频率。通过对组合基距及组内距的计算,论证了检波器组合对信号频率及振幅的影响程度。实际资料分析证明,检波器组合在噪音压制的同时也会损伤到有效信号,尤其高频信息成份;过大的检波器组合基距,不仅会降低原始资料信噪比,甚至还会降低原始资料频率。据此提出在高信噪比地区,采集地震数据宜采用较小检波器组合基距,以提高原始资料的分辨率。 相似文献
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我国油田水的离子组合特征 总被引：3，自引：0，他引：3
建国二十多年来，在毛主席无产阶级革命路线指引下，我国石油地质事业得到了蓬勃的发展。特别是经过无产阶级文化大革命，广大石油地质工作者，以阶级斗争为纲，坚持独立自主、自力更生的方针，在辽阔的国土上展开了大面积的石油地质普查勘探工作，发现了许多新油区，建成了很多新油田。事实证明，我国油气资源丰富多彩：含油面积之大、含油地层时代之长、成油-储油类型之多，都是世界各国罕见的，彻底粉碎了“中国贫油”的谬论。 相似文献
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山城金矿为石英脉型金矿,受断裂构造控制。本文以多种地质、地球化学信息为基础,讨论该矿元素组合及其时空分布。结果表明,元素组合与一定成矿阶段和构造空间对应,并有一定载体,其中第一阶段元素组合与构造面倾角变化有关,栽体主要为石英脉,主成矿阶段元素组合与构造面走向扭动有关,载体主要为多金属矿化,进而查明了各阶段指示元素和矿体延伸方向。同时讨论了元素指示意义的局限性。 相似文献
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大别—苏鲁超高压地体折返过程中岩石组合演化的地球化学约束 总被引：7，自引：2，他引：5
大别—苏鲁超高压地体现今的岩石组合是超高压变质岩石经历快速折返过程中各种地质作用叠加改造的最终产物, 其中拆沉、底侵、构造体制转换是改造的动力; 退变质作用、构造置换、深熔作用是改造的主要方式.超高压地体的主要岩石组合有榴辉岩、大理岩、硬玉石英岩、斜长角闪岩、片麻岩和面理化花岗岩.地质、常量、微量、同位素地球化学研究表明, 斜长角闪岩是榴辉岩退变的产物, 片麻岩、面理化花岗岩是榴辉岩退变的斜长角闪岩递进深熔的产物, 即退变榴辉岩折返到中下地壳, 初次熔融产生相当于片麻岩成分的半原地英云闪长质-花岗闪长质-花岗质岩浆, 片麻岩再次熔融产生成分相当于面理化花岗岩的A型花岗岩岩浆. 相似文献
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利用多元素组合异常指示元素平均值与大兴安岭森林沼泽区水系沉积物地球化学元素丰度值的差,以及与其所在地球化学子区元素变化系数的乘积关系,度量多元素组合异常指示元素在成矿地质作用中的聚集变化强度;计算多元素组合异常元素变化强度的和,对多元素组合异常进行元素变化强度和的评序,遴选主要组合异常.利用多元素组合异常指示元素蕴涵R型因子分析因子结构组合元素矿化类型的意义,判别多元素组合异常因子矿化类型.依据主要组合异常分布、因子矿化类型以及与测区物探、遥感解译线性、环形构造的关系,建立测区主要组合异常聚集带、聚集区.依照主攻矿种元素、相应主要组合异常因子矿化类型信息和相关成矿地质理论,开展测区多元素组合异常优中选优的找矿验证工作. 相似文献
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海拉尔盆地查干诺尔凹陷扎赉诺尔群孢粉组合 总被引：3，自引：0，他引：3
内蒙古自治区呼伦贝尔盟地区海拉尔盆地查干诺尔凹陷扎赉诺尔群自下而上划分为4个孢粉组合。云杉粉Piceaepollenites sp.-单束松粉Abietineaepollenites sp.-三角粒面孢Granulatisporites sp.组合,分布于大磨拐河组一段;罗汉松粉Podocarpidites sp.-双束松粉Pinuspollenites sp.-无突肋纹孢Cicatricosisporites sp.组合,分布于大磨拐河组二段;无突肋纹孢Cicatricosisporites sp.-刺毛孢Pilosisporite sp.-水龙骨单缝孢Polypodiaceaesporites sp.组合,分布于伊敏组一段;有突肋纹孢Appendicisporites sp.-桫椤孢Cyathidites sp.-星粉Astropollis sp.组合,分布于伊敏组二、三段。上述孢粉组合研究证明,大磨拐河组地质时代为早白垩世凡兰吟期—欧特里夫期(Valanginian-Hauterivian),尽管没有出现最原始的被子植物花粉,但也不排除部分进入巴列姆期(Barremian)的可能,伊敏组的地质时代为早白垩世巴列姆期-阿普第期(Barremian-Aptian)。据此认为扎赉诺尔群地质时代为早白垩世凡兰吟期—阿普第期(Valanginian-Aptian)。 相似文献
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In this paper we have attempted to pose a methodological problem, and to provide answers to some fundamental measurement problems in research. In the search for the regularities which are thought to underlie the phenomena we study, geographers and others have often had recourse to Graph Theory to represent certain situations. Once some pattern of interaction can be depicted by using a group of points (nodes) joined by lines (links or edges), interest is often centered around the degree of correpondence between two graph-theoretic representations of empirical evidence. We have suggested methods for answering the question: are the link patterns for the two graphs so similar that they could not reasonably have arisen by chance? The approach to the solutions are based on probability theory and the properties of certain statistical distributions — the binomial, the hypergeometric, the hypergeometric?onominal and other combinations. In each case we have provided a rationale for the suggested solution as well as tables and computational procedures. The examples have been chosen from a wide variety of situations, for graph-theoretic representations are found in many fields of investigation. 相似文献
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The discovery that Au accumulates in calcrete (pedogenic carbonate or caliche) was made in 1987 by CSIRO. Calcrete is a general term describing accumulation of alkaline earth metals in soils of arid and semi-arid terrains around the world. The principal constituent of calcrete is calcite while Au is a noble metal. Calcrete has been a significant tool in a number of Au deposit discoveries, so understanding the mechanisms by which these diametrically different components come together is valuable for enhancing future discovery. Numerous laboratory experiments, case histories and exploration models have been published (most from Australia) yet we do not fully understand the mechanisms involved. It is timely, therefore, twenty-five years on since the first publication of this phenomenon, to review this highly unusual but economically important association.Critical to any review on Au in calcrete is to first consider calcretes themselves. The nature of a particular calcrete, where it has formed and mode of formation is relevant to how, where and why Au accumulates within it. This review commences with a background, nomenclature, history, classification and some examples of calcrete types found near Au deposits. How calcretes form, their origins and the role of biota is considered. Their locations in the regolith and landscape, as well as exploration models for Au in calcrete are discussed. A section on the chemistry of Au in calcretes details what we know about possible mechanisms of formation and considers what laboratory experiments on microorganisms and abiotic experiments tell us. Following on is a summary of practical aspects of identifying, collecting and analysing samples for exploration purposes. Selected mineral exploration case histories are described and how they fit into models of exploration and different regolith settings. Concluding sections include a summary and implications of this accumulated knowledge to discovering Au deposits. 相似文献
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D. F. C. Morris 《Geochimica et cosmochimica acta》1956,10(5-6):322-323
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