金川含矿超镁铁岩侵入体侵位序列   总被引：1，自引：0，他引：1       下载免费PDF全文

苏尚国  汤中立  周岱 《地学前缘》2010,17(2):118

金川铜镍硫化物矿床是世界第三大镍矿床,但其成岩成矿过程及侵位机制一直存在较大争论。根据金川含矿超镁铁岩岩石学特征、穿插关系、矿物成分及地球化学特征,提出了金川含矿岩体5阶段的成岩、成矿侵位序列,它们分别是:(1)超镁铁质岩浆侵位;(2)浸染状硫化物矿浆侵位;(3)网状硫化物矿浆侵位;(4)块状硫化物矿浆侵位;(5)铂钯富集体侵位。金川铜镍(铂)矿床中Ni,Cu,Pt,Pd,Rh,Ir,Ru,及Co与S呈正相关关系;当ω(S)=5%～15%时,铂族元素发生明显的分离作用,铂族金属主要富集在铂钯富集体中。铂钯富集体是硫化物矿浆经单硫化物固溶体结晶后的残余熔浆;块状矿石是单硫化物固溶体堆积而成的产物。金川铜镍硫化物矿床的侵位机制为岩墙型岩浆通道。  相似文献   

造山带挤出构造与高压-超高压岩石剥露机制:以大别山为例   总被引：3，自引：1，他引：2       下载免费PDF全文

刘鑫  李三忠  索艳慧  周均太  焦倩  徐磊  赵峰梅  吴奇  庞洁红  戴黎明 《地学前缘》2010,17(4):185

造山带挤出构造阐述了被边界断裂所围限的造山带深变质块体,在造山带内部垂向和(或)侧向应力的作用下折返变形的过程。研究主要集中在挤出块体的几何形态及其内部变形样式、边界断裂特征、挤出路径以及挤出动力来源等4个方面,其研究目的主要是为了解决造山带深变质岩石折返剥露的机制问题。依据挤出块体的挤出方向与造山带主体走向之间的关系,在三维球形坐标系Lx-Ly-Lz中,将造山带挤出构造大致分为7个端员类型(Ⅰ型～Ⅶ型)。其中Lx为造山带或俯冲带的主体走向;Ly呈水平方向并与Lx相垂直;Lz垂直于Lx和Ly所构成的平面。这些基本端员类型的组合及其之间的过渡类型可以详尽地诠释大别山印支期高压-超高压岩石的挤出过程。其中榴辉岩相挤出阶段介于Ⅳ型与Ⅶ型挤出构造之间,角闪岩相挤出阶段介于Ⅱ型与Ⅵ型挤出构造之间并可能具有渠道流挤出模式,而绿片岩相挤出阶段类似于Ⅴ型挤出构造。  相似文献   

雪峰山西侧贵州地区中生代构造特征及其演化     

刘丽萍  李三忠  戴黎明  王岳军刘博  金宠  张国伟 《地质科学》2010,45(1):228-242

贵州中生代变形主要发生在燕山期,发育三幕褶皱变形、两幕逆冲和三幕走滑。根据区域对比、卷入褶皱的地层和褶皱间的叠加关系,判断三期褶皱的形成顺序依次为近东西向、北东向和南北向,时限在J3—K2之间。逆冲推覆构造主要由向北西或西逆冲的近南北向逆冲断层组成,大体与南北向褶皱同时形成; 自雪峰构造带西缘向西,依次划分出根部带、中部带和前锋带。但是,在根部带识别出两幕逆冲推覆,其它两带各识别出一幕。走滑断层也有3个方向：东西向、北东向和近南北向。东西向走滑断层呈现出右行压扭的运动学特征,而大多数北东向走滑断层是左行张扭性质的。依据各个方向断层间的切割和限制关系,推测东西向走滑断层最早形成,其次是南北向逆冲断层,北东向走滑断层最晚活动。这些断裂和褶皱特征,总体表现出贵州多重多种复合联合的构造特征,最后,探讨了本区的构造成因模式。  相似文献   

First orbital period analysis of the Algol-type eclipsing binary RZ Aurigae     

Y.-G. Yang  H.-F. Dai  X.-G. Yin 《New Astronomy》2010,15(4):392-395

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介质置换管道防冻方法在多分支注浆工程中的应用     

李健  马晓涛  聂新明  代晓光  胡中国 《化工矿产地质》2022,44(1):86-90

地面定向多分支孔注浆在煤田防止水领域已广泛应用,在多分支孔注浆工作中,成孔与注浆交替进行.注浆站外供水、内供水及注浆管路处在露天环境下,在冬季施工管路防冻是注浆工作必须解决的问题.在东庞煤矿西庞井地面区域治理二期工程中,用盐水置换管路中的清水,成功解决了这一问题.  相似文献   

Stepwise inversion of a groundwater flow model with multi-scale observation data   总被引：1，自引：0，他引：1  

Zhenxue Dai  Elizabeth Keating  Carl Gable  Daniel Levitt  Jeff Heikoop  Ardyth Simmons 《Hydrogeology Journal》2010,18(3):607-624

Based on the regional hydrogeology and the stratigraphy beneath the Los Alamos National Laboratory (LANL) site, New Mexico (USA), a site-scale groundwater model has been built with more than 20 stratified hydrofacies. A stepwise inverse method was developed to estimate permeabilities for these hydrofacies by coupling observation data from different sources and at various spatial scales including single-well test, multiple-well pumping test and regional aquifer monitoring data. Statistical analyses of outcrop permeability measurements and single-well test results were used to define the prior distributions of the parameters. These distributions were used to define the parameter initial values and the lower and upper bounds for inverse modeling. A number of inverse modeling steps were performed including the use of drawdown data from the pump tests at two wells (PM-2 and PM-4) separately, and a joint inversion coupling PM-2 and PM-4 pump test data and head data from regional aquifer monitoring. Parameter sensitivity coefficients for different data sets were computed to analyze if the model parameters can be estimated accurately with the data provided at different steps. The joint inversion offers a reasonable fit to all data sets. The uncertainty of estimated parameters for the hydrofacies is addressed with the parameter confidence intervals.  相似文献   

从地震信息看阿尔金断裂带构造和塔里木盆地花彩弧断裂体系   总被引：1，自引：0，他引：1  

杨建  戴福贵  吴红华  杨克绳 《海相油气地质》2010,15(2):56-63

阿尔金断裂带由多条断裂组成,主要有阿尔金断裂、且末断裂、三危山断裂。其中阿尔金断裂为主断裂,它呈左旋走滑兼具逆冲性质,中生代—古近纪为左旋走滑,新近纪由东南向西北逆冲推覆。且末断裂和三危山断裂均具左旋走滑性质。且末断裂受统一的阿尔金断裂带左旋应力场控制,但又叠加了塔里木台盆区向南挤压的应力场,从而具有双重属性。塔里木盆地的断裂总体上组成古生界塔北花彩弧断裂束和塔南花彩弧断裂束,展布成全盆地的菱形断裂系统,且末断裂构成其东南边界。在该菱形断裂系统的北弧顶和菱形内的中央轴部为背冲式的构造断裂带,显示挤压特征;在花彩弧两翼转弯处展布正花状构造样式,显示走滑特征。阿尔金断裂带及其两侧,主要在柴达木、塔里木两大盆地发现了大油气田,两者都是由断层控制油气的垂向运移与分布。柴达木盆地具有双重断—坳的特点,但油气田只分布在中—新生界构造层内;塔里木盆地,南北翘板式的构造运动是其形成复式油气区的最重要的地质构造条件。  相似文献   

Integrated water resource security evaluation of Beijing based on GRA and TOPSIS   总被引：2，自引：0，他引：2  

Jing Dai  Jing Qi  Jingjing Chi  Shaoqing Chen  Jin Yang  Liping Ju  Bin Chen 《Frontiers of Earth Science》2010,4(3):357-362

Security evaluation has become a hot topic in the research field of water resource management. In this paper, we established a novel water resource security indicator system based on the Pressure-Status-Response (PSR) framework using gray relation analysis (GRA) and technique for order preference by similarity to ideal solution (TOPSIS). A case study of Beijing from 1996 to 2007 was conducted to verify the evaluation system. Results showed that the gray relative closeness degrees of water resource security to the positive ideal solution were low, with the least one of 0.360 in 1999 and the largest one of 0.527 in 2007, implying that Beijing was facing severer challenges with water resources during the concerned time. Also, the analysis of water resource security indicated that the pressure of water resource was constantly increasing. Finally, factor analysis was employed to calculate the gray relation degrees of evaluating indices with the ideal solutions so as to reveal the relativity of water resource security of Beijing, which may contribute to a better understanding of the urban water resource management and regulation.  相似文献   

川南煤田象顶井田瓦斯赋存特征及影响因素     

戴敬儒  吴永贵 《中国煤炭地质》2010,(12):18-23

根据象顶井田大量瓦斯实测资料分析,区内瓦斯含量高分带不明显,沼气带在埋深100m以下,瓦斯含量有随埋深增加而增大的趋势,但相关性不显著,地质构造及水文条件是影响区内瓦斯分布的主要因素。井田内先期发育的压性层间滑动断层(f701)及其派生断层纵贯全区,导致构造煤发育,瓦斯含量高;中部及西南部的F39、F418、F428、F405张性正断层切割了先期的压性断层,断层破碎带及裂隙为瓦斯逸散提供了通道,同时断层使上盘煤层与下盘岩溶发育的茅口灰岩直接接触,加速了瓦斯的逸散,致使该区域内煤层瓦斯含量降低,形成了井田北东部瓦斯含量高、中部及南西部含量相对较低的格局。根据煤体结构、构造分布、煤层特征,预测区内C19煤层易发生突出区域位于井田北东部。  相似文献   

Potentials of phototrophic bacteria in treating pharmaceutical wastewater   总被引：7，自引：6，他引：1  

E. I. Madukasi  X. Dai  C. He  J. Zhou 《International Journal of Environmental Science and Technology》2010,7(1):165-174

A suspended growth photobioreactor was utilized to treat pharmaceutical wastewater by a wild strain purple non-sulfur photosynthetic bacterium isolated from the soil. The strain was named Z08 and identified as Rhodobacter-sphaeroides by 16SrDN. The photobioreactor was illuminated externally with two (40 W) fluorescent compact light sources on both sides. Its operation pH and temperature were between 6.8–7.0 and 20–30 °C, respectively. Optimum growth of the isolate was obtained after enrichment of the pharmaceutical wastewater with 0.5 % ammonium sulfate and 0.1 % yeast extract under microaerobic optimum light (6000 lx) condition at 5d retention. Using these optimum conditions, the maximum dry cell weight and chemical oxygen demand percentage removal were 880 mg/L and 80 %. Chemical analysis of the culture after treatment of the enriched and non-enriched wastewater showed the crude protein content of the biomass to be 54.6 % and 38.0 %, respectively. This study proved that photosynthetic bacteria could transform complex wastewater that contains recalcitrant organic compounds with a resultant recovery of useful products.  相似文献