青海都兰克错铜多金属矿地质特征及找矿前景分析

为了探索克错铜多金属矿区的找矿潜力,文中对该研究区的成矿地质背景、地质特征、矿体特征、控矿因素、矿床成因等进行了综合分析。结果表明:研究区内共发现矿(化)体28条,根据铜、锌、金、铁矿体赋存条件分析,发现矿体的形成与地层、构造及岩浆岩关系密切;区内与铜多金属矿有关的围岩蚀变主要为孔雀石化、矽卡岩化、碳酸盐化及硅化等;区内矿床形成于华力西期—印支期。根据矿床地质特征及成因分析,该地区铜多金属矿床的类型分为两类,西研究区为热液充填型矿床,东研究区为矽卡岩型矿床,研究区具有一定的找矿前景。     

陕西洛南地区木龙沟矽卡岩型铁矿地质特征及找矿标志

矽卡岩型铁矿是我国最重要的富铁矿类型之一,而这种铁矿在我国陕西洛南地区分布较密集。木龙沟铁矿是以铁为主伴有铂、铜、锌等多种金属的矽卡岩型铁矿矿床,其围岩性质以含MgO较高的碳酸盐岩为主要特征;铁矿体分布范围与外带镁矽卡岩基本保持一致,主要呈透镜状、似层状、不规则状等赋存于透辉石-镁橄榄石矽卡岩和硅镁石矽卡岩中,矿体中辉铂矿化、黄铜矿化和闪锌矿化等具明显分带性;矽卡岩型铁矿的主要找矿标志为围岩蚀变现象。了解本区铁矿的矿床地质特征及找矿标志,有助于探讨矽卡岩型矿床的成因类型及成矿规律,为我国矽卡岩型矿床找矿提供一定方向。     

辽宁宽甸四平街矽卡岩型钼矿床控矿因素及外围找矿

本文通过四平街矽卡岩型钼矿床地质特征的阐述及矿床控矿因素分析，指出了矿床外围找矿靶区。     

柿竹园钨锡矽卡岩矿床中成矿流体的不连续演化现象

湖南省柿竹园矽卡岩型钨、锡、钼、铋矿床中流体包裹体的初步研究表明在该区的矽卡岩化阶段和云英岩化阶段之间存在有成矿流体的不连续演化现象:流体的温度和盐度表现为从早到晚反方向升高。结合其它的地质地球化学证据,本文认为在矽卡岩固结之后发生的补充期花岗岩的活动和相关流体的分离、侵入与叠加,是产生上述不连续演化现象的原因。     

我国卡林型金矿的基本特征

本文总结了卡林型金矿的成矿地质背景,矿床基本地质特征,金的赋存状态等几个方面。我国卡林型金矿主要分布于扬子板块西南缘和西北缘,形成滇黔桂、陕甘川、西南秦岭和湘中四个矿集区。卡林型金矿床中金主要为显微-次显微粒级,主要的载金矿物为黄铁矿。国内外卡林型金矿床中,成矿元素的组合特征以低温元素组合汞-锑-砷-金最为普遍。     

青海哈西亚图多金属矿床地质特征及成因探讨

为了加快青海省优势环境与战略矿产勘查进程,文中对哈西亚图多金属矿床成矿地质背景、矿床地质特征、控矿因素及成因进行了综合分析,研究结果表明:哈西亚图多金属矿床已发现矿体的成因类型为矽卡岩型,矿体从垂向上看,可分为4层均产于具垂直分带的矽卡岩带中,受矽卡岩类型影响矿石类型在垂向上也具有明显分带性,在华力西期花岗闪长岩与古元古界金水口岩群的碳酸盐岩的接触带附近为主要成矿部位,通过早期区域变质作用、矽卡岩化作用及晚期的热液成矿作用3个阶段,形成了以磁铁矿体为主,铜、铅、锌、金并存的多金属矿床。     

中国矽卡岩型金矿的成矿时间、空间、地球动力学背景和成矿模式

矽卡岩型金矿床是我国最主要的金矿类型之一,目前已确定至少14个矿床为大型,24个为中型,占我国黄金总储量的15%。中国矽卡岩型金矿床的成矿时间与其所在地区最晚的碰撞造山作用时间吻合,就位于碰撞造山作用的晚期;中国矽卡岩型金矿床分布在碰撞造山带、断裂岩浆带和陆缘活动带,它们都经历了强烈的显生宙碰撞造山作用;成矿地球动力学背景为碰撞造山作用的挤压-伸展转变期。无论是中国矽卡岩型金矿床的地质地球化学特征,还是含矿岩体的地质地球化学特征,都与碰撞造山成矿模式完全吻合,证明碰撞造山成矿模式是中国绝大多数矽卡岩型金矿床的成矿模式。     

辽西虹螺山—五指山地区钼多金属矿床控矿条件分析及成矿预测

虹螺山—五指山是辽西重要的钼、铅、锌、金等多金属成矿带,已发现大、中型钼、铅、锌、金矿床多处。文中通过对区内地质背景、典型矿床特征和成矿机制的研究,确定研究区的矿床控矿条件,进行找矿靶区优选。研究认为,研究区地层控矿表现为中元古界、寒武系和奥陶系地层中的各种灰岩、白云岩对矽卡岩型、热液充填交代矿床的控制;岩浆控矿表现为燕山早期岩浆活动为成矿提供热源和部分物质来源;构造控矿表现为多组构造交汇处及多期活动复式构造带为成矿提供了通道和空间。依据研究成果,结合地球化学异常等找矿标志,将杨家杖子外围、八家子外围、旧门、乔杖子划为找矿靶区,可优先安排地质工作。     

皖南大坞尖钨(钼)矿床地质特征及成因分析

大坞尖钨(钼)矿床是皖南地区新发现的小型钨(钼)矿床.该矿床的矿体主要呈似层状,主要赋存于蓝田组下段白云质灰岩和钙质泥岩中.赋矿围岩以强烈的绢云母化、硅化和碳酸盐化为特征,矿石矿物为白钨矿和辉钼矿,脉石矿物主要有石英和绢云母.矿床的形成可划分4个成矿阶段,即无水矽卡岩阶段、含水矽卡岩阶段、石英硫化物阶段和碳酸盐阶段.通过对矿床地质特征和控矿因素的综合分析研究,认为大坞尖钨(钼)矿床属矽卡岩-云英岩复合型热液矿床,研究区具有重要的找矿潜力.     

广东大顶铁矿田多金属矿床地质特征及成矿规律

大顶铁矿田位于粤东北铁锡铅锌成矿带的北部,区内已分布众多规模大小不等的矿床。该区的矿床在20世纪70年代“大顶会战”时发现火山沉积-热液迭加磁铁矿床,另外还发现了小型高温热液充填石英脉型黑鸽矿,2005年开始又在矿田西南部角岩或弱矽卡岩化角岩层发现了层控矽卡岩型锡矿床和接触交代矽卡岩型铅锌矿化,揭示了该矿区矿床类型的多样性。通过对区内多金属矿床成矿地质特征及成矿规律的分析总结,为今后铁锡多金属找矿工作提供新的认识。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the