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青州市表层土壤元素地球化学组合特征研究 总被引：1，自引：0，他引：1
聚类分析和因子分析可以获得土壤元素地球化学组合特征及其差异性。对青州市表层土壤样品数据进行分析研究,通过聚类分析,绘制表层土壤元素聚类谱系图,将23种元素或指标分为5个元素组合簇群及2个单元素簇,研究各元素间的组合特征,探讨其相关性、聚集性及其指示意义;通过因子分析,找出有代表性的因子,用其代表变量,绘制典型因子得分等值线图,并从中分析不同元素组合的区域分布基于何种因素,用11个代表性因子的分布特征就基本可以代表青州市表层土壤23项原始变量的分布特征,并对F1,F2,F3主因子进行了地质解释。聚类分析与因子分析相结合,利于表层土壤中元素的共生组合特征及其差异性研究,利于对研究区表层土壤异常进行归纳总结。 相似文献
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鸡爪金矿主要金矿脉赋存在近东西向的褶皱轴部的挤压破碎带中,容矿岩石为大石桥组二段矽线黑云片岩、二云片岩,围岩蚀变为硅化、钾长石化、黄铁矿化。通过57个矿床原生晕样品部分微量元素相关分析、R型聚类分析和正交因子、斜交因子分析,表明Au、Cu、Ag组合为主要矿化阶段的元素组合,是化探找矿的重要指示元素。 相似文献
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猫岭金矿是一低品位、大型热液型金矿床。金矿体主要以脉状、似层状、透镜状产于下元古界辽河群盖县组二段的千枚岩中,受北北东向片理化带及低序次构造裂隙所控制。矿床原生晕样品的 R 型聚类分析和因子分析的结果表明,与金矿化关系最密切的元素为 Pb、Ag,其次为 As。即 Au、Pb、Ag 代表了主成矿阶段矿化元素组合特征,而 As 和 Co、Ni 元素组合分别反映了与 Au 矿化具成因联系的毒砂和磁黄铁矿化特点。(Au、Pb、Ag)因子与(As、Ag)因子紧密相关,与宏观上所见矿化阶段生成的矿物(自然金、方铅矿等)沿毒砂裂隙分布的特点相吻合,从而说明这两个因子的元素组合代表了最佳成矿地段的元素组合特征。 相似文献
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土壤中元素含量的高低和元素存在的形态变化从根本上受控于自然地质地球化学作用过程。地质背景对土壤地球化学元素含量的贡献度在区域上具有决定意义,不同区域土壤地球化学元素含量水平具有明显的差别。不同的地貌景观是由不同的地质作用形成,从而形成不同的地球化学特征。在多目标区域地球化学调查的成果基础上,根据因子分析、聚类分析研究成果,结合与典型元素组合、地貌、地质特征把河套地区划分为9个地球化学分区,并进一步划分为13个地球化学亚区。通过地球化学分区,为河套地区的农业发展、环境保护等工作提供了基础地球化学资料。 相似文献
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内蒙古准和热音苏木地区属古亚洲成矿域内蒙古-大兴安岭成矿省二连-东乌旗晚古生代-中生代成矿带,是我国重要的铜及多金属集中分布区。野外调查采集了地表岩石(打块)样品61件,化验分析Au,Ag,Cu,Pb,Zn,As,Sb,Bi,Hg,W,Sn,Mo,Cd,Co,Cr,Ni共16种元素。通过综合岩石中元素的地球化学分布特征信息,分析岩石元素的含量、各岩石分区元素的含量、岩石元素富集离散等特征,利用因子分析、聚类分析,研究岩石元素的组合特征,对元素组合的物质属性进行判定,分析成矿性,指明了找矿方向,指出了该区具有寻找硫化物型的Pb,Cu,Bi有色金属矿产及与安山岩有关的Cd,Co矿的找矿潜力。 相似文献
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本文采用聚类分析、对应分析等多元统计方法,研究了东秦岭地区发育的73个有代表性的花岗岩类岩体的岩石化学成分。通过其中的600多件标本分析对比,确认四类不同成因系列的花岗岩(分别是S型、I型、A型、M型)有着不同的岩石化学组合特征,根据这些特征着重讨论元素共生组合及岩浆演化规律。通过多方面的岩石化学分析,得出各不同成因类型花岗岩所对应特征元素分别是:S型(SiO_2);I型(K_2O);A型(SiO_2、K_2O、Na_2O);M型(CaO、MgO、FeO)。并且对岩石的碱性程度、氧化还原环境、铝指数、钙指数、钾指数等作了相应的研究,列出了岩石化学成分平均值。 相似文献
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为有效、准确的寻找金矿床,结合文登青庄地区基岩出露情况,选择开展了1∶1万土壤地球化学测量。该次工作测网选择100 m×40 m,局部加密至100 m×20 m,采集20~30 cm深处的BC层土壤,过40目样筛,过筛后样品重量均大于150 g,分析Au,Ag,Cu,Pb,Zn,As,Bi,Mo等8种元素。通过对各元素分析结果进行R型聚类分析,认为将As,Sb元素作为寻找Au矿的主要指示元素在该区不适用,该区Au与Bi的相关性较好。通过合理确定各元素的背景值和异常下限,圈定单元素异常190处,根据元素组合特征圈定综合异常19处,其中AP7,AP19成矿条件较好,划分为乙1类异常,重点开展异常查证工作。通过探槽施工、化验分析等异常查证工作,在两个异常内均发现金矿(化)体,样品中金品位(0.30~3.64)×10-6,确定了土壤地球化学测量在该区找矿工作中的适用性和有效性。区内发现的金(矿)化体赋存于蚀变破碎带内,矿化蚀变主要有黄铁矿化、硅化、绿泥石化,与邻近的西院下金矿相似,初步确定区内寻找的金矿床类型应为构造角砾岩-碎裂岩型金矿床。 相似文献
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昌乐县土地质量地球化学调查与评价是按5件/km^2的密度布设表层土壤样品,并以“多点取样”的方式进行样品采集,采样深度为0~20cm。分析有机质、N,P,K,B,Mo,Mn,Se,I,Ge,F,Pb,Zn,As,Cd,Cr,Cu,Hg,Ni,Co,V,pH和全盐量,共23项。该文统计了昌乐县表层土壤5818件样品的23种元素(指标)的数据,通过spss软件进行了聚类分析将23种元素(指标)划分为3个簇群和9个单元素簇,认为第一簇群主要受地质背景的影响;第二簇群主要受黏土矿物的影响;第三簇群主要与自然因素及人类农业生产活动有关。通过因子分析得出用10个因子就基本可以代表昌乐县原来23种元素(指标)的分布特征,并对F^1,F^2因子进行了解释,进一步证实了Ni,Co,Cr,V,Mn等亲铁元素与地质背景密切相关;有机质、N,Se则与自然因素及人类农业生产活动有关。首次摸清了昌乐县表层土壤元素组合分布特征,认为昌乐县表层土壤元素分布主要与地质背景、元素自身性质和人类农业生产活动有关。 相似文献
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因子分析模型是用少数不可观测的变量来解释原始变量问相互关系的一种数学模型.本文采用因子分析模型,对我国各地区大量工业及生活排放污染物数据进行了计算分析,得到了各地区单项污染和整体污染分析结果,最终在全国环境污染专题地图中得以应用.实验证明,因子分析模型能简化数据结构,减少信息冗余,发现环境污染的主要因素,为各地区环境整治提供了科学、准确的量化指标. 相似文献
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The source of elements and the modern sedimentary environment of the ferromanganese nodules enriched area of the North Pacific
region were analysed statistically and discussed in detail. Cluster analysis shows the area's surface sediments are mainly
brown clay and biogenic calcareous, calcsiliceous and siliceous ooze. Factor (principal component) analysis shows that the
area's trace elements (Fe, Mn, Cu, Co, Ni, Zn, Cr, etc.) mainly come through adsorption of clay minerals and secondarily from
authigenic sediments related to biochemical processes.
Bao Gende, 1990. Characteristics of element geochemistry in sediments in the ferromanganese nodules enriched area of the North
Pacific region.Acta Sedimentologica Sinica. (in press, in Chinese) 相似文献
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Assessment of heavy metal pollution in estuarine surface sediments of Tangxi River in Chaohu Lake Basin 总被引：3，自引：1，他引：3
A total of 30 surface sediments samples from the estuary wetland of the Tangxi River, Chaohu Lake Basin were obtained and tested. Enrichment factor (EF) and geoaccumulation index (I_(geo)) as well as multivariate statistical analysis methods including Factor Analysis (FA) and Hierarchical Cluster Analysis (HCA) were applied for the assessment of heavy metal pollution in surface sediments. The results of EF values show that the pollution of copper (Cu) and cadmium (Cd) occurs in the estuarine sediments, and that zinc (Zn), lead (Pb) and chrome (Cr) may originate from crustal materials or natural weathering process. The mean EF values of the five heavy metals are in the decreasing order: Cu>Cd>Zn>Pb>Cr. Based on the I_(geo) of target heavy metals, the surface sediments collected from the study area can be approximately categorized as unpolluted with Zn, Pb and Cr, and moderately polluted with Cu and Cd. The degree of heavy metal pollution decreases in the order of Cu>Cd>Zn>Pb>Cr. Three groups of pollution factors are presented from FA: Zn-TOC, Cu-Cd and Cr-Pb, which respectively accounte for 27.22%, 25.20% and 21.05% of variance. By means of HCA, a total number of seven groups are distinguished from 30 sampling sites. Results indicate that Cu and Cd are the prior controlled pollutants in the estuarine sediments of the Tangxi River. 相似文献
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There are about 19 Neolithic Age sites and 120 Shang-Zhou dynasties sites in the western lakeshore of Chaohu Lake, Anhui Province,
China. Based on sites data, topographic data, drainage maps, administrative maps and SPOT5 remote sensing data, spatial analysis
methods were introduced into the archaeology of Chaohu Lake Basin with Geographic Information System (GIS). The spatial analysis
methods include: 1) Point Density Analysis with density model to acquire the shift of the sites; 2) Distance Analysis to reveal
the spatial structure of the sites; 3) 3D Analysis based on Digital Elevation Model to get micro-geomorphologic features of
the sites; and 4) Buffer Analysis to discover the relationship between the sites and rivers. The results indicate that the
archaeological sites spread from the western lakeshore of Chaohu Lake gradually to the northwest, later to the south, and
then symmetrically spread. Controlled by productive forces and other factors, ancient people preferred to reside in those
places near water, or in plain and fertile land, which resulted in linear and decentralized distribution of the sites, and
presented such disciplines as river valley directivity, terrace directivity and soil directivity. This paper indicates that
the distribution of archaeological sites was influenced earlier by natural elements and later by human elements in the study
period. The research is important for the integration of GIS and archaeology. 相似文献
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冯荣扬 《广东海洋大学学报》2000,20(1)
根据粤西 6个市 (县 )种植的 3个主要芒果品种芒果炭疽病 (Gloeosporium mangiferae P.Henn.et al)病情指数 ,应用模糊聚类分析方法 ,划选出粤西种植芒果的适宜区域。并指出干旱地区不利于该病发生 相似文献
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选取浮游植物初级产量、浮游植物现存量、有机物耗氧量、总氮、无机氮、总磷、活性磷等七项指标,由德尔菲法确定各指标的类别界限值和权重,用灰色系统理论的定权灰色聚类方法,借用计算机对23个湖泊和水库营养类型主要参数作灰色聚类分析,以建立一种划分我国湖泊和水库营养类型的有效方法,作为渔业生产的依据。 相似文献
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The purpose of this study is to investigate the control function and mechanisms of natural river notches. Physical and numerical experiments are analyzed in this study for two representative types of sediment events: high intensity and short duration Type A sediment disaster events, and low intensity and long duration Type B moderate non-disaster events. Two dimensionless parameters, sediment trapping rate and reduction rate of peak sediment transport, are defined to evaluate the sediment control function of river notches. Study results indicate that the contraction ratio of the notch has a significant influence on sediment control function, with high contraction ratios resulting in both high sediment-trapping and high reduction rates. River notches provide better sediment control during Type A events than Type B events. The sediment control mechanism of river notches is the result of multiple interactions among river flow, sediment transport, and riverbed variation. Analysis of these interactions supports the significant protection role of river notches on sediment control for disaster events 相似文献