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隐爆角砾岩筒型矿床成矿流体演化趋势曲线特征 总被引：6，自引：0，他引：6
阐述了隐爆角砾岩筒型矿床及其成矿过程中的隐爆流体演化趋势曲线的一般特征，在此基础上，讨论了凹山铁矿床、祁雨沟金矿床、七宝山铜金矿床等典型矿床的矿体产出特征与隐爆流体演化趋势曲线之间存在的耦合关系，结合隐爆角砾岩筒型矿床成矿流体演化的一般特征和特殊情况，对轻微剥蚀岩筒、中等剥蚀岩筒和深度剥蚀岩筒的成矿性进行了分析。 相似文献
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对东川因民铁铜矿区辉长岩类侵入体的侵入构造几何学特征、物质组成和储矿构造样式进行研究,认为侵入构造特征复杂,辉长岩类以岩墙、岩床、岩株、岩枝和岩脉等产出,受落(雪)因(民)复式褶皱-断裂带核部及核部发育的SN向、NE向和NW向断裂控制,辉长岩类侵入体在空间上与铁铜矿体关系密切。从侵入构造中心向外具有三大构造岩相学分带,依次为侵入构造岩相带→热液蚀变角砾岩相带(体)→液压致裂-碎裂岩化相带,即侵入构造带(侵入角砾岩相带+含矿隐爆角砾岩相)→热液角砾岩体(筒)(热液角砾岩相+含矿热液角砾岩相)→断裂裂隙破碎带(含矿液压致裂角砾岩+含铜硫化物脉带)是本区主要含矿构造岩相带,是寻找和预测深部隐伏IOCG型矿体和热液型脉带状铜矿体的直接找矿预测标志。辉长岩类侵入体与落因复式褶皱-断裂带、小溜口岩组与因民组之间不整合面构造等形成了构造复合和储矿构造样式的多样性。本区储矿构造样式主要有辉长岩类侵入构造、隐爆角砾岩筒(带)和钠长石角砾岩筒(带),落因复式褶皱-断裂带与辉长岩类侵入体的复合叠加构造、辉长岩类侵入体与不整合面之间的叠加构造等,控制了不同类型矿化组合和矿床类型(成矿多样性)。在因民铁铜矿区深部小溜口岩组及落因背斜东翼,围绕辉长岩类侵入构造带是今后寻找IOCG矿床的主要靶位。 相似文献
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豫西地区是国家重点金多金属成矿区带,成矿地质条件优越,区内金及多金属矿类型多样。通过对研究区地质特征及成矿地质条件的分析,得出区内金及多金属矿矿床形成受多重因素控制,包括地层、构造以及岩浆岩因素,并且在这些因素中,构造控矿占主导。在此基础上,将研究区内金矿矿床类型分为构造蚀变岩型金矿床、构造破碎带型金矿床、斑岩型金矿床以及爆破角砾岩筒型金矿床4种类型,并对每一种类型选取1个典型的矿床进行具体讲述。依据对研究区成矿地质特征以及5种构造控矿类型的叙述,论述了拆离-变质核杂岩构造对金矿成矿的构造控矿作用和构造控矿规律,并根据该区金矿矿床成矿规律,提出选取找矿靶区的8项依据,最后优选出7处找矿有利靶区。 相似文献
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酒地红山金矿类型为构造蚀变岩型，其矿质来源于地层，赋矿主岩为变质砂岩、粉砂岩、板岩和灰岩，金矿化受断裂构造和褶皱构造双重控制。本文论述该矿床的地质特征，分析其成矿条件和成矿机制，旨在为客观评价矿床，扩大矿床规模，在本区及外围寻找同类型的矿床提供指导。 相似文献
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作者以矽长岩矿床为例,深入探讨了各类侵入接触构造的控矿作用。着重研究接触构造破碎带的控矿作用。通过对众多矿床实例的分析、归纳、总结,指出各类矽长岩矿床的有利成矿构造.对寻找盲矿体、扩大矿区远景储量具一定参考价值。 相似文献
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山东七宝山角砾岩筒成矿流体构造动力学过程 总被引：3，自引：0，他引：3
山东七宝山角砾岩筒内外流体构造（岩）类型多样,具自身特有的时空结构。岩筒内角砾岩胶结胶体中的结晶矿物和矿体类型在空间分布上具规律性的结构特征,并与角砾岩体分布的结构相吻合。角砾岩筒结构,构造的构造动力学分析结果表明,角砾岩筒岩石的破裂形成于流体的双重致裂作用的脉动扩展,即：在流体的热应力和液压双重作用下形成性质不同的节理裂隙和上凸锥面状裂隙带,并脉动式往上扩展形成圆柱状压裂角砾岩体;锥面状裂隙带顶 相似文献
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将福建省直接或间接与岩浆活动和热液作用有关的金属矿床划分为层控，岩控和脉型矿床三大类，总结了层控，脉型矿床成群成带，分区展布的规律和岩控矿床等距有序，集中分布的规律，建立了受不同构造环境，构造类型和构造性质控制的层控，岩控和脉型矿床的构造空间分布模式，提出了若干新的找矿思路。 相似文献
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L. V. Panina 《Moscow University Geology Bulletin》2009,64(1):21-28
This paper discusses issues related to the neotectonic structure and evolution of the Scythian Plate, beginning from the Late Miocene. The undertaken structural and geomorphologic analysis of topographic maps and space images supplemented with geologic-geophysical data, including back-stripping curves, allowed us to reveal an association of growing recent uplifts of different ranks and decreasing depressions of a roughly Caucasian trend. Both are cut by weak zones (faults and fracture zones) oriented roughly E-W and N-S. All these deformations evolved under impact from collision processes within the Greater Caucasus Orogenic Belt. 相似文献
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The enthalpies of solution of a suite of 19 high-structural state synthetic plagioclases were measured in a Pb2B2O5 melt at 970 K. The samples were crystallized from analyzed glasses at 1200°C and 20 kbar pressure in a piston-cylinder apparatus. A number of runs were also made on Amelia albite and Amelia albite synthetically disordered at 1050–1080°C and one bar for one month and at 1200°C and 20 kbar for 10 hr. The component oxides of anorthite, CaO, Al2O3 and SiO2, were remeasured.The ΔH of disorder of albite inferred in the present study from albite crystallized from glass is 3.23 kcal, which agrees with the 3.4 found by Holm and Kleppa (1968). It is not certain whether this value includes the ΔH of a reversible displacive transition to monoclinic symmetry, as suggested by Helgesonet al. (1978) for the Holm-Kleppa results. The enthalpy of solution value for albite accepted for the solid solution series is based on the heat-treated Amelia albite and is 2.86 kcal less than for untreated Amelia albite.The enthalpy of formation from the oxides at 970 K of synthetic anorthite is ?24.06 ± 0.31 kcal, significantly higher than the ?23.16 kcal found by Charluet al. (1978), and in good agreement with the value of ?23.89 ± 0.82 given by Robieet al. (1979), based on acid calorimetry.The excess enthalpy of mixing in high plagioclase can be represented by the expression, valid at 970 K: ΔHex(±0.16 kcal) = 6.7461 XabX2An + 2.0247 XAnX2Ab where XAb and XAn are, respectively, the mole fractions of NaAlSi3O8 and CaAl2Si2O8. This ΔHex, together with the mixing entropy of Kerrick and Darken's (1975) Al-avoidance model, reproduces almost perfectly the free energy of mixing found by Orville (1972) in aqueous cation-exchange experiments at 700°C. It is likely that Al-avoidance is the significant stabilizing factor in the high plagioclase series, at least for XAn≥ 0.3. At high temperatures the plagioclases have nearly the free energies of ideal one-site solid solutions. The Al-avoidance model leads to the following Gibbs energy of mixing for the high plagioclase series: . The entropy and enthalpy of mixing should be very nearly independent of temperature because of the unlikelihood of excess heat capacity in the albite-anorthite join. 相似文献
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Dr. H. J. Zwart 《International Journal of Earth Sciences》1964,53(1):170-205
Five deformationphases occurring on a regional scale have been found in the Paleozoic sequence of the Pyrenees. The first phase was responsible for the development of large concentric folds in the southern and northern borders of the axial zone. The second or main phase has lead to the differentiation in suprastructure and infrastructure. Folds have E-W axes and are accompanied by cleavage or schistosity. The next phase has N-S axes and its occurrence is restricted to the infrastructure. The third cleavage phase is a conjugate system with vertical NW and NE striking axial planes of folds. Like the N-S phase it indicates E-W compression. The fourth cleavage phase has again an E-W direction like the main phase. The intrusion of the granites can be related to this structural history. A final phase consists of tilting and fanning of the cleavage of the suprastructure, accompanied by the formation of knickzones.
Zusammenfassung Im Paläozoikum der Pyrenäen konnten fünf verschiedene Deformationsphasen über große Gebiete hinweg festgestellt werden. Die erste hat im Süden und Norden der Axialzone sehr große N-S bis NE-SW gerichtete Biegefalten verursacht. Die zweite, aber erste Schieferurigsphase ist in dem epizonalen Schiefergebirge oder Oberbau und in dem meso- bis katazonalen Unterbau verschiedenartig entwickelt. In beiden Fällen streichen jedoch die Faltenachsen E-W, und es liegt eine N-S-Einengung vor. Die folgende Phase ist auf die metamorphen Gebiete beschränkt und wird von N-S gerichteten Falten mit flacher Schieferung begleitet. Die dritte Schieferungsphase besteht aus zwei gleichzeitigen Scherfaltensystemen in NW- und NE-Richtung. Sie weist wie die vorhergehende Phase auf eine Einengung in E-W-Richtung hin. Die vierte Phase hat E-W gerichtete Falten mit Schieferung hervorgerufen und ist wie die Hauptphase eine N-S-Zusarnmenstauung. Die Intrusion der Granite kann in diese tektonische Entwicklung eingeordnet werden. Während einer späten Phase sind die Schieferungsflächen zu einem großen Fächer verstellt worden. Das Auftreten von Knickzonen ist mit diesem Auseinanderfallen der Schieferung verbunden.
Résumé Dans le Paléozoique des Pyrénées cinq phases de déformation peuvent être reconnues. La première phase a formé des plis concentriques sans schistosité et se trouve près de la bordure nord et sud de la zone axiale. Les quatre phases suivantes sont accompagnées d'une schistosité. La phase principale a causé une différentiation entre supra- et infrastructure, tous les deux avec des plis E-W. La deuxième phase synschisteuse ne se trouve que dans l'infra-structure et est caractérisée par des plis N-S. Une phase suivante consiste d'une système conjugée de plis avec direction des plans axiaux des plis NW et NE. La dernière phase a produit des plis E-W. L'intrusion des granites peut être datée dans cet histoire tectonique. Une phase tardive a causé la formation d'un gros structure en éventail des plans de clivage du suprastructure.
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土结构性是决定土力学特性的一个最为根本的内在因素。基于综合结构势理论的土结构性参数研究是土结构性研究的一种行之有效的方法, 它不仅考虑了土颗粒排列的几何特征和土颗粒联结的力学特征,而且对土结构性进行了综合的、整体的、动态的量化。对已提出的结构性参数进行全面的总结和评述,统一了结构性参数的命名。在此基础上,总结了结构性参数与强度和变形的关系、结构性参数本构模型和结构性参数应用方面的研究现状,并进一步分析了土结构性描述的合理途径以及结构性与固结状态对强度和变形的影响,提出了同一结构性条件下研究结构性土强度、变形本构规律的新观点。 相似文献
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Peter Trurnit Dr. 《GeoJournal》1991,25(4):305-358
The Earth's stress field is composed of 4 sub-fields that are induced by
- the gravitational force (impacts, etc; geodynamic theories on the expansion or contraction of the globe);
- the centrifugal force of the spinning Earth (models on continental drift explaining the equatorial Alpine-Himalayan collisional mountain belt and longitudinally orientated rifts or oceans);
- thermal convection (plate tectonic model);
- tidal forces (extended plate tectonic model).
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The Paleozoic of Graz is an isolated nappe complex of about 1,500 km2 size and belongs to the Austroalpine units of the eastern European Alps. Despite more than 500 publications on stratigraphy,
paleontology and local structure, many aspects of the internal geometry of this complex as a whole remained unclear. In this
contribution, we present integrated geological profiles through the entire nappe complex. Based on these profiles, we present
(1) a simplified lithological subdivision into 13 rock associations, (2) a modified tectonostratigraphy where we consider
only two major tectonic units: an upper and a lower nappe system and in which we abandon the traditionally used facies nappe
concept, and (3) a modified paleogeography for the whole complex. Finally, we discuss whether the internal deformation of
the Paleozoic of Graz is of Variscan or Eo-Alpine age and which of the published models best explain the tectonic evolution
of the Paleozoic of Graz. 相似文献
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针对应力比结构性参数存在的问题,建立了结构性黄土初始结构性参数与含水率、围压之间的关系,在变形过程中建立了更为合理的结构性参数与广义剪应变的关系,并将其引入结构性黄土的强度理论中。在此基础上,通过数值计算对边坡结构性参数分布的变化规律及潜在滑动面的确定进行了评价。研究结果表明：建立的初始结构性参数可以反映黄土边坡的结构性参数初始分布场;结构性参数变化的上限是初始结构性参数,下限为结构性完全丧失后的结构性参数,且其值等于1.0;在结构性黄土边坡稳定性分析中,通过结构性参数的分布规律可在一定程度上确定边坡的潜在滑动面,但仅适用于塑性区域呈明显的带状集中分布的情况。 相似文献
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The potential to destroy any structure during earthquakes depends on the structural design, vulnerability rating, percentage of structural elongation as compared with the natural quiet conditions, the dynamic characteristics of structure itself, as well as the dynamic characteristics of the site. Thus, factors related to the dynamic characteristics of structure and the dynamic characteristics of the site are necessary in the design of resistant structures against earthquakes. In this study, recordings of free oscillation were made directly on 18 selected structures in the urban city of Aqaba, which represent the structural culture of the city and the whole Jordan in general. Ground ambient vibration records were conducted at 18 nearby location at a few meters away from each structure. Records were conducted during the maximal cultural activities using three-component seismometer of 2 Hz free oscillation. Analytical results of records obtained on structures, has given the following equation: $ f = {18}/N $ , where f, is the fundamental mode of structure and N, is the number of stories. All structural records were conducted at the top level of each structure except at Shmesani 4 and 7. Horizontal sensors were oriented with respect to the longitudinal and transverse direction of structural horizontal projection. Damping factors for each structural longitudinal and transverse fundamental mode were calculated based on the obtained FFT spectrums of each orientation using half-width band method. Analysis of obtained records on structures in Aqaba show that most of them are of short periodic structures except a few multi-story tall buildings. Most of the results obtained on structures refer to damping factors that range between 0.05 and 0.208. Mathematical relation derived from this study above, in addition to the actual calculated damping factor, refers to non-compliance with the standards of earthquake-resistant design. Results of ground records analysis indicate to the westward and north-westward decrease of dominant frequency relative to the eastern and southeastern part of the study area, where the crystalline granite bedrock is much shallower reflecting the actual condition of surface geology. Striking that the H/V amplification was relatively higher in the scope of areas where the thicknesses of soft surface deposits in the eastern and southeastern part are much shallower relative to the western and north-western part of the study area. This can be interpreted as a result of much higher impedance contrast in the eastern and southeastern part relative to the western and northwestern parts of the study area. 相似文献