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阿勒坦达坂金锑矿处于博罗科努岛弧带中[1].主要地层为中泥盆统汗吉尕组,岩性为泥质粉砂岩、石英岩屑砂岩、钙质砂岩夹火山灰凝灰岩、火山角砾岩等.构造主要为NW向,褶皱、断裂十分发育,褶皱主要为紧密线型,断裂均为中、高角度逆断层,总体上组合成叠瓦式. 1 矿区地质特征 岩石及其蚀变 矿区出露的岩石主要为灰褐、浅褐色火山灰凝灰岩夹少量火山角砾岩,火山碎屑岩中侵入有少量脉状及小岩株状花岗斑岩、花岗闪长岩.岩石受断裂构造及脉岩和小侵入体的影响,具有不同程度的硅化、绿泥石化和退色化现象,局部断裂破碎带内形成n×10-2~n m厚,… 相似文献
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通过对本区铁矿矿床的研究,主要目的是为了发现本区铁矿床的地质特征和找矿标志。本区铁矿床属火山沉积型铁矿,赋存于下石炭统老爷庙组第二亚组地层中,铁矿与含碳质凝灰岩、凝灰岩以及凝灰质砂岩等围岩共同构成含矿带。主要找矿标志为地层标志、构造标志、地貌标志。 相似文献
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贝尔凹陷苏德尔特构造带南屯组一段Ⅰ-Ⅳ油组为火山碎屑沉积岩储层,岩性为凝灰质砂砾岩、凝灰质砂岩、含凝灰泥岩和沉凝灰岩。该含油层段的储层物性与埋深没有直接关系。凝灰质颗粒大小对储层物性影响很大。I油组凝灰质砂砾岩以中-高孔、低渗-特低渗为主;Ⅱ、Ⅲ油组凝灰质砂岩以中-低孔、特低渗-超低渗为主;Ⅳ油组含凝灰泥岩以低孔隙度、特低渗-超低渗为主。凝灰质砂砾岩、凝灰质砂岩、含凝灰泥岩的主要成岩作用为压实作用、胶结作用和重结晶作用。压实作用和胶结作用是使储层孔隙变小、物性变差的因素;矿物的多形转变作用产生脱玻化孔,有助于微小喉道的发育。 相似文献
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本区位于额尔齐斯构造带的东端、西伯利亚板块阿尔泰边缘和准噶尔—北天山板块北部边缘的接合部位,区内为中低山—丘陵戈壁地带,海拔900~2000m。属温带大陆性干旱半干旱气候,Ⅰ级水系为乌伦古河,额尔齐斯河亦流经区内的部分地段。 1.扎河坝西金矿床矿区位于富蕴县境内扎河坝煤矿西南约15km处,乌伦古河海沟带之北东缘,纳尔曼得—扎河坝蛇绿混杂岩的西段南测。出露地层为上泥盆统,岩性为凝灰质砂岩、粉砂岩、安山—玄武质岩屑晶屑凝灰岩、角砾凝灰岩和安山玢岩。构造表现为一系列次级小断裂成群成带出现,呈北面—南东向排列。不仅控制着超基性岩及闪长岩的出露,而且还控制着矿化蚀变带和金矿体的展布。扎河坝西金矿体主要赋存于蛇绿混杂岩体外侧的构造破碎蚀变带中。围岩蚀变发育,与矿化关系密切的主要为黄铁矿化、硅化、绢云母化和碳酸盐化。测试表明(表1),区内氢、氧同位素组成变化范围都不大。在δD_(H_2O)-δ~(18)O_(H_2O)相关图上,数据投影点位于岩浆水、变质水的左下方与雨水热液区之间,三个点由上向下排列有序。其成矿热液应为岩浆水和大气降水的混合,并且大气降水占有较大比例。 相似文献
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大小金沟金矿位于库鲁克塔格西北部,大地构造位置属塔里木地台库鲁克塔格断隆.辛格尔深大断裂从矿区北部通过,南部发育有许多近EW向、NW向及NE向的次级断裂,元古代和华力西期岩浆岩发育,形成近EW向的构造岩浆活动带,为成矿提供了极为有利的条件.区内元古代及华力西中期岩浆岩发育,出露地层有元古界、震旦系、寒武系、泥盆系(图1),元古界为长城系兴地塔格群和青白口系帕尔岗塔格群,岩性为一套中深变质的片岩、片麻岩;震旦系为冰碛岩、砂岩夹砾岩;寒武系为硅质岩、凝灰砂岩;上泥盆统破城子组为砂岩、凝灰岩.辛格尔深大断裂走向近EW,延长数… 相似文献
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土性平稳随机场的空间统计特性分析 总被引:8,自引:6,他引:2
阐明了平稳随机场的空间统计特性,根据平稳随机场各态历经性概念,讨论了土层满足各态历经性的条件,以及计算空间平均方差和相关距离的公式。并结合工程实例,分析了空间平均方差计算的影响因素。 相似文献
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介绍了满洲里市的自然地理特征。通过大量的水文地质调查、地面物探、工程测量、水文钻探、抽水试验、室内测试分析等方法和手段,确定了满洲里市的地层、构造、地下水水文地质特征,即透水层、隔水层、单位出水量、导水系数、单井出水量、影响半径和水质类型。最后提出开采建议。 相似文献
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Liquefaction characteristics of silts 总被引:1,自引:0,他引:1
S. Singh 《Geotechnical and Geological Engineering》1996,14(1):1-19
Summary The paper presents a summary of the results of cyclical triaxial load testing of samples of silt and silty sands. The paper emphasizes differences in behaviour observed between reconstituted triaxial samples of clean sand, of sand containing 10, 20, 30 and 60% silt, pure silt, and undisturbed samples of silt and silty sand. An important observation is that the mechanisms of deformation for sit are different for reconstituted and undisturbed samples, the undisturbed sample having a specific geological structure which seems to slow down the excess pore water pressure accumulation, but which still results in cyclic deformations regularly increasing from the very beginning of the test and rapidly reaching high levels. The other important observation is that fine-grained noncohesive soils such as silts and silty sands can be as, or even more, susceptible to liquefaction as clean sands. Test results on samples of sand containing 10, 20 or 30% of silt indicate lesser resistance to liquefaction than pure sand samples. The paper shows the difficulty in identifying a representative parameter to compare the behaviour of silts and silty sands with pure sand, and it seems that more research will be needed in this area. 相似文献
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Compressibility characteristics of soils 总被引:1,自引:0,他引:1
Compressibility characteristics of soils forms one of the important soil parameters required in design considerations. Compression index, Cc, which is the slope of the linear portion of void ratio, e vs. logaritham of effective pressure p(log p) relationship, is extensively used for settlement determination. The e–log p is most often assumed to be linear at higher pressure range and hence Cc is taken as a constant. Both published experimental results as well as results obtained in this investigation reveal that the e vs. log p could be curved, concave upwards or concave downwards depending upon the soil plasticity characteristics and initial water content. Thus, assuming Cc to be constant may not be valid for many cases. In this paper, an alternate procedure is given to characterise the compressibility of a soil. Experimental results show that the deformation expressed as a percent of thickness of the soil, (strain) vs. effective pressure could be treated as a rectangular hyperbola and the behaviour could be characterised by two parameters, a and b. Characterising the compressibility behaviour with effective pressure by two parameters is better than a single parameter, Cc. 相似文献
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查干础鲁金矿矿体赋存在侵位于阿木山组的浅成超浅成次火山岩(次石英粗安岩)中,是受构造控制的蚀变岩型金矿床。通过对次石英粗安岩的岩石学特征、矿物学及地球化学特征进行分析,显示出次石英粗安岩为贫钙型铝过饱和系列,是金矿床的主要赋矿岩石,其次为细粒闪长玢岩。有用组分主要为Au,其次为Ag。金主要以自然金形式存在,主要与次石英粗安岩中的石英脉关系密切,或是存在于假象黄铁矿及褐铁矿中,虽然微粒金产出数量最多,但从面积比上看,则以粗粒金、巨粒金为主,赋存状态以晶隙金为主,包体金及裂隙金较少。自然金粒形态主要为片状、弯曲片状、不规则片状。 相似文献
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Leaching characteristics of fly ash 总被引:6,自引:0,他引:6
Aysenur Ugurlu 《Environmental Geology》2004,46(6-7):890-895
The disposal of fly ash as a byproduct of thermic power stations, results in significant environmental problems. The leaching of coal fly ash during disposal is of concern for possible contamination, especially for the aquatic environment when ash is in contact with water. The aim of this study was to investigate the leaching behaviour of fly ashes currently disposed in Kemerkoy Power Plant (Turkey) fly-ash-holding pond. The studies were conducted with fly ashes from the electrostatic precipitators (fresh fly ash) and from the fly ash pond (pre-leached fly ash). The fly ashes has alkaline in nature and pH ranges between 11.9 to 12.2. The pre-leached fly ash exhibited lower EC values (7,400 µS) than the fresh fly ash (10,300 µS). In contrast to Fe and Pb, the elements such as Cr, Cd, Cu and Co did not leach from the fly ash. The Ca and Mn concentrations decreased with increasing temperature whereas, Na and K concentrations increased. The results showed that the most important effects of fly ash leaching were pH, Na, Ca, K, Fe, Mg, Mn and Pb. 相似文献
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对产于多米尼加的海纹石样品进行了矿物学测试和分析.镜下观察显示,海纹石呈致密的纤维状结构,纤维长约0.01~0.02 mm;X射线衍射表明,海纹石样品主要由针钠钙石组成,并未检测到其它杂质成分,与能谱分析结果一致;不同色调的海纹石样品在红外光谱和紫外-可见光吸收光谱上都没有表现出本质的差别. 相似文献
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Jacques De Medina Laura M. G. Motta João D. G. Dos Santos 《Geotechnical and Geological Engineering》2006,24(4):949-971
This paper summarizes the resilient and permanent deformation characteristics of laterite gravels, determined by cyclic loading in triaxial tests of compacted specimens. A study of laterite pavements was carried out on eight paved road sections in the state of Mato Grosso. Also reported is the influence of fine sand admixture, specimen size and soaking in two laterite samples from Roraima and Rondônia in the North of Brazil. The experimental relationships of resilient moduli against applied stresses are interpreted empirically for models what may be incorporated in a structural analysis of full depth of laterite pavement. 相似文献