共查询到20条相似文献，搜索用时 15 毫秒
1.
李芳玉 《物探化探计算技术》2011,33(1):97-100,122
三维地质建模与GIS应用目的不同,由此决定了它们研究重点不同,这二者的相互结合能促进双方的共同发展,但目前对此还缺乏较系统的研究。这里在对三维地质建模和GIS功能进行比较分析的基础上,指出了二者相结合的意义,提出了二者相结合的途径并分析了各自的优缺点,最后对二者相结合的发展趋势进行了展望。 相似文献
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借助于定量GC—MS分析技术,系统分析了一组取自辽河油田生物降解程度不同的原油芳烃馏分中三芴系列的组成特征。结果表明在生物降解过程中三芴系列化合物很容易遭受生物降解。母体三芴化合物在原油轻微降解阶段抗降解能力相似,其相对组成保持基本稳定,仍可指示沉积环境的性质;但进入中等及以上程度降解作用后,抗生物降解能力出现差异,相对组成发生变异,失去其环境意义。在甲基三芴系列中,甲基硫芴的抗降解能力强于甲基芴和甲基氧芴,降解速率不一致,组成特征不断变化,使甲基三芴系列相对组成不能指示沉积环境的性质。“三芴系列”被细菌消耗的速率不同,整个生物降解过程中其相对组成都在发生变化,因此对生物降解原油而言,无论其降解程度如何,“三芴系列”相对组成特征均不能有效的指示沉积环境的性质。 相似文献
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Ｃ６０晶体是碳元素的第三种同质异构体，Ｃ６０，Ｃｎ及其衍生物有许多新奇的物理化学特性。本文介绍了运用高新测试分析技术深入研究这类新材料结构、物化特性、合成提纯条件及开发高科技新材料产品的前景；探讨了利用天然石墨、各种煤炭等提取合成一些重要价值的Ｃ６０，Ｃｎ及衍生物产品的可行性。 相似文献
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苏皖凹凸棒石矿物红外光谱特征研究 总被引：13，自引：0，他引：13
苏皖凹凸捧石粘土矿物包括沉积、风化及火山碎屑蚀变三种成因类型。成矿物质来源于内陆浅水湖盆水下玄武岩风化蚀变及地表玄武岩的风化。不同成因类型的凹凸棒石在矿物晶体结晶程度上有较大差异。通常,由风化作用生成并与碳酸盐共生的沉积型凹凸棒石结晶程度低,较纯的并与硅质岩共生的沉积型凹凸棒石结晶程度高。它们在红外吸收光谱特征上表现为:前者红外振动吸收带分裂程度低,吸收峰弱且峰形钝。后者红外振动吸收带分裂程度高,吸收峰尖锐。因此研究凹凸捧石的红外吸收光谱特征可基本上区分出它们的成因类型。本文还对凹凸棒石红外吸收光谱振动波数带进行了划分,并对相应的振动类型作了探讨。 相似文献
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地勘单位要吸引和留住人才,就要在事业、感情、待遇留人上下功夫.即营造鼓励人才干成事业、帮助人才干好事业、创造施展才华的社会氛围和环境;用来自领导的关心爱护之情,同事的团结友爱之情来拴住人心;为人才提供与其创新能力和贡献相适应的物质待遇,使人才充分享有实现自身价值的自豪感、贡献社会的成就感、得到社会承认的荣誉感. 相似文献
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天然气水合物研究现状与未来挑战 总被引：36，自引：3，他引：33
人类在21世纪后期面临着油气资源枯渴,寻求洁净高效的新能源成为科学界追求的目标。为此,近三十年来,世界各国相继投入了大量的资金和人力开展新能源研究。目前,人们在一种重要的新能源---气水合物的基础研究、地质调查、勘探开发等领域取得了较大的进展;但尚存在许多急待解决的重大理论问题,如天然气水合物形成与分解的动力学过程和地质条件,气水合物资源量计算办法,经济型天然气水合物开采、开发模式,气水合物对全球气候的影响等。天然气水合物作为化石燃料,具有巨大潜力;作为甲烷碳库,是海底地质灾害的诱因;作为温室气体,对全球气候变化有着重要的影响作用。天然气水合物研究未来面临挑战。 相似文献
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《International Geology Review》2012,54(10):1297-1307
Results of a comparative study of magnetic properties and the petrochemical composition of noncontemporaneous effusives may be applied in differentiating their primary and diagenetic varieties, epicontinental (platform) and geosynclinal formations, and ore-contact alteration of basic effusives, associated with propylitization. In addition, it becomes clear that the mineral and chemical composition of mobile belt effusives, especially pre-Cenozoic, depends less on the overall chemical composition of their original magma than on elements added and removed from them during the nascent metamorphism. This point must be taken into consideration in determining the specific material composition of magmas involved, as well as of their evolution within orogenic zones. In the instance of the so-called "fresh" rocks of mobile belts, their content of magnesium and iron oxides, and alkalis, with all their ratios, are not the geochemical correlatives of their parent magmas. On the other hand, some of such oxides and their ratios, such as MgO and Fe2O3/FeO, may constitute, along with magnetic characteristics, objective indicators of nascent metamorphism in basic effusives — and of their age, as long as the two are usually proportionate.--Author's summary. 相似文献
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Assoc. Prof. Dr. M. A. Mohamed Salih 《GeoJournal》1991,25(1):51-57
During the past half century Moro society has undergone immense economic and social transformations. The Moro adopted rural-urban and rural-rural migration, among other things, to diversify their incomes and augment their sources of livelihood. Politically, the introduction of modern political parties since independence in 1956 and the emergence of regional movements have influenced Moro perception of their reality and relationship with their Hawazma and Jellaba neighbours.I argue in this paper that due to disappointments emanating from harsh living conditions in discordant Northern Sudanese towns, the Moro translate past experiences into a common identity. Migration, in this sense, is seen as a major factor in explaining the Moro crisis of identity and their oscillation between integration and aloofness or modernity and traditionalism. 相似文献
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峡东地区南华纪-寒武纪地层风化过程元素及Sr-Nd同位素演化特征及其地球化学意义 总被引：1，自引：0，他引：1
以峡东地区南华纪、震旦纪和寒武纪标准地层泥岩、冰碛泥岩、砂岩、灰岩和白云质灰岩及对应的风化土壤为研究对象, 分析了地层风化成土过程中不同元素的迁移行为, 根据剖面样品的Sr-Nd同位素组成变化, 探讨了其同位素体系的封闭性特征与应用意义.结果表明: (1) 不同岩性基岩在成土过程中的蚀变强度有明显的差异, 在相似地表条件下, 碳酸岩风化剖面的风化程度高于泥质岩和砂岩; (2) 通过对比稳定高场强Ti元素在基岩和风化剖面中的含量变化, 计算出土壤样品在风化过程中体积相对基岩发生的改变量, 进而计算出不同岩性基岩在风化过程中微量元素的绝对含量变化以探讨这些元素的活动规律.结果表明, 灰岩和白云质灰岩的风化剖面元素含量变化明显, 而在泥质岩风化过程中大多数元素保持了相对稳定, 说明沉积岩风化过程中元素的活动性特征明显地受到了原岩矿物组成的制约.风化过程中, 不同性质的元素的活动性差异明显, 其中亲硫元素(Cu、Zn、Pb、Mo) 和大离子亲石元素(Rb、K、Sr、Ba) 在不同岩性的风化剖面中均表现出明显的元素含量变化, 而高场强元素(Zr、Hf、Nb、Ta) 含量则相对稳定; (3) 泥质岩风化形成的土壤层REE含量变化较小, 而碳酸岩风化土壤层REE含量发生了明显下降, 且其风化形成的土壤表现出LREE和HREE相对于MREE的富集.无论是碳酸岩或泥质岩风化形成的土壤, 均出现了明显的Eu负异常和Ce的正异常, 但在其原岩中这些异常并不存在或不明显; (4) 基岩与土壤剖面间Sr同位素组成和Rb/Sr比值存在明显差异, Rb-Sr同位素组成发生了明显的开放.所形成土壤层的Sr同位素组成受到2种因素的约束: 原岩性质和外来组成的Sr同位素比值.因此在总体上, 风化土壤的Sr同位素组成已不能代表基岩的Sr同位素组成; (5) 沉积岩风化过程中, 碳酸岩和泥质岩形成的风化土壤基本保持了原岩的Sm-Nd同位素组成特点, 由其组成所获得的Nd同位素亏损地幔模式年龄等能反映其原岩信息, 而近源沉积形成的砂岩和含砾冰碛泥岩所形成的土壤, 其Nd同位素组成则存在不同程度的改变. 相似文献
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不整合分类研究进展与新型分类方案 总被引：6，自引：0，他引：6
总结了前人对不整合类型的划分工作和不整合形态特点,在此基础之上,根据不整合的成因机制和不整合形态的主控因素,提出了新型不整合分类方案,将不整合分为七个大类,包括削截不整合、褶曲不整合、底辟不整合、震积不整合、古岩溶不整合、超覆不整合和假整合,并进一步细分为13个亚类。新型的不整合分类考虑了震积作用研究等最新的地质学进展,吸收了许多有益成果,扩充了不整合类型,更加关注盆地的自身特点,通过剔除重复类型等方法,使不整合分类方案更加完备,具有较高的科学性和实用性。文中还以国内外有关油田为例分析了不整合类型基本特征。 相似文献
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《International Geology Review》2012,54(2):297-306
Resistance or susceptibility of different rocks to granitization and ultra metamorphism may be related to the degree of their equilibrium and to their energetic (thermodynamic) anisotropism. All rocks may be divided accordingly into active and passive ones, depending on their behavior in granitizing environments. The active group (sedimentary, elastic, clayey, mixed, noncrystalline effusives) consists of energetically anisotropic ones as well as of rocks that failed to attain their chemical equilibrium by the time of their stabilization. Such rocks are able to release a part of their energy in a certain stage of their granitization. The passive group includes sedimentary rocks (carbonate, ferruginous), fully crystalline magmatic rocks, energetically isotropic homogeneous sandstones, and quartzites). Granitization of such rocks, is, among other things, an endothermal phenomenon. Basic and ultrabasic magmatic rocks are susceptible to granitization, provided they are interbedded with water-bearing sediments (including the passive ones); the resistance of such combinations to granitization is lower than the resistance of their constituents separately. Exothermal phenomena in granitization, such as release of energy from thermodynamically anisotropic bodies or of the accumulated solar energy (by crystalline substance) in reactions involving an uptake of liquid and gaseous phases, insufficient as they may be to assure a continuity of the granitization, may have a decisive effect upon the granitization-resistance of the rocks. — V.P. Sokoloff 相似文献
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Sedimentologists often find such depositional sequences, which visually, but even for microscopic examinations look homogeneous, and their fossil-content is very low. These sequences can be subdivided into genetic units only with great difficulties or not at all, and their correlation may be problematical.An experiment is presented here, aiming at a subdivision of loess profiles by a combined use of sedimentological, palaeontological and mathematical methods. The loess samples selected for this examination were characterised by their grain size parameters as suggested by Folk and Ward (1957) and by their carbonate content. Using a Q-type cluster analysis these samples were classified into different groups by their similarity. After arranging the samples with their cluster symbols into their real stratigraphic position, the genetic units of the depositional sequence were delimited by an analysis of the vertical series of the previously established cluster-groups. Finally, a method of discriminant analysis was applied to establish the stability, ie the probability, of the existence of the vertical genetic units obtained by this zonation method.Parallel to it the sequence was subdivided from a faunistic point of view, too. These units correlate well with the results of the numeric approach. 相似文献
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青海省同仁县隆务镇西山滑坡研究 总被引：1，自引：0，他引：1
论述了西山滑坡的地质特征，分析其复活机理，并找出控制其活动，再变形的主要因素，进而用Ｓａｒｍａ法评价其稳定性，为制定有效治理措施提供科学依据。 相似文献
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根据层状含钒钛磁铁矿岩体的韵律特征及其铁质量分数变化规律,探索性地应用瑞利分馏模型模拟四川攀西地区攀枝花、红格、白马、太和等岩体成矿元素富集过程,分别建立了各岩体的统计模型和理想模型,并据此估算了铁矿石以及伴生钒、钛资源量。其中:攀枝花、红格、太和等岩体的数学模型比较一致,可能与这些岩体岩浆结晶分异比较彻底、成矿性好有关;而白马岩体的模型参数有较大差异,充分体现了该岩体结晶分异不彻底、成矿性相对较差的特点。 相似文献
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《International Geology Review》2012,54(9):976-978
Representative opokas of the region are suited for use as foundations, in undisturbed state, within the range of their bearing strength (dry), their relatively low frost-resistance, and the limitations consistent with their mechanical composition, high porosity, high water-holding capacity, plasticity and other indices. – V. P. Sokoloff. 相似文献
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通过区内505和530等主要矿脉石英红外吸收光谱、热爆裂及热发咣特征的系统研究，总结了该区无矿、贫矿及矿体石英脉评价的石英矿物学标志，表现为：①无矿石英起爆温度为210－330℃，热爆裂曲线无明显峰型；石英热发光总强度大于20000cps，峰值强度大于500cps;②贫金石英脉其石英红外吸收相对光密度DCO2／DH2O值大于1．1；起爆温度为210－280℃，石英热爆裂曲线为明显单峰形态，主爆峰对应温度值为420－440℃；石英热发光总强度介于10000－20000cps之间，峰值强度介于150－300cps之间；③矿体石英脉其石英红外吸收相对光密度DCO2／DH2O值小于1．0；起爆温度100－160℃，热爆曲线为单峰型，主爆峰对应温度为140－180℃；石英热发光总强度值小于10000cps，峰值强度小于150cps。根据本区含金矿脉矿化分带模式及石英红外吸收光谱、热及热发光参数系统变化规律，建立了该区石英脉型金矿床找矿评价的石英矿物学标志模型。 相似文献
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The chemical study shows that the Kupol fahlores are complex compounds with significant variations in their composition and the proportions of their constituent elements. Based on their major-element composition, they are subdivided into 3 species and several inter- and intra-species varieties. This testifies that the fahlores were formed under different physicochemical conditions. 相似文献
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《International Geology Review》2012,54(7):1054-1061
Analytical data on ferruginous and auriferous constituents of this formation in several mining districts of the Altay-Sayan folded region, their geologicaltectonic positions, phase-facies structures, and characteristics of their volcanogenic sedimentary host rocks suggest magmatic differentiations in the batholiths as the cause of their individual metallogenic biases. — V.P. Sokoloff 相似文献