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oxidation environment
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  氧化环境
     Factor F1 indicates the oxidation environment and is correlated with the terrigenous material,factor F2 indicates the weak oxidation environment,and factor F3 indicates the weak reduction environment. The wavelength ranges of principal factors F1,F2 and F3 are 405 to 445 nm and 495 to 595 nm,605 to 695 nm and 445 to 485 nm,respectively.
     主因子F1指示氧化环境,并与陆源物质相关,F2指示弱氧化环境,F3指示弱还原环境,主因子的波长范围分别是405~445 nm和495~595 nm,605~695 nm,445~485 nm。
短句来源
     The exampleanalysis suggests that  ̄(234)U/ ̄(238)U ratio is 7.1  ̄(234)U/ ̄(230)Th ratio is 560 in the groundwater atNevada test site U.S.A,and this aquifer system is in stronger oxidation environment,U,Th,Ra,Pb and Po radionuclides are highly retarded,their retardation factors are range form 10 ̄2~10 ̄5 and distribution coefficients are 4.7~2630 ml/g.
     实例分析表明,美国内华达州试验场地下水中 ̄(234)U/ ̄(238)U=7.1, ̄(234)U/ ̄(230)Th=560,显示出含水系统处于强氧化环境; U,Th,Ra,Pb和Po放射性核素强烈地受到吸附阻滞,其阻滞系数为10 ̄2-10 ̄5,分配系数为4.7~2630ml/g。
短句来源
     pH is generally less than 6.5. Thewhole groundwater system is in the oxidation environment.
     地下水中 pH 值一般小于 6.5,呈偏酸性甚至弱酸性,并且处于氧化环境中。
短句来源
     The results are as follows:(1) Groundwater in Dongwu Banner is dominated by HCO_3-Na type,and it is manly phreatic water under the oxidation environment;
     结果表明:①东乌旗地区地下水类型有HCO3-Na型,主要为氧化环境的潜水;
短句来源
     In turn, during the postglacial period, the CaCO_3 and Al_2O_3 contents became higher, and the ratios of Na to Al , Mg to Al and Na to K decreased, which reflected that the sedimentary environment became an open oxidation environment, the climate became humid and hot with a stronger condition of chemical weathering.
     冰后期褐铁矿出现高含量,钠与铝、镁与铝和钠与钾的比值均降低,Al2O3和CaCO3含量增高,反映沉积环境渐变为开放的氧化环境,气候转变为化学风化作用较强的湿热气候;
短句来源
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  高温氧化环境
     In the oxidation environment, coating could be oxidized to form dense oxide film with the self-healing function on the surface. The scale on the surface of Mo(Si0.6,Al0.4)2 coating could be divided into two layers: the free surface was Al2O3;
     在高温氧化环境下,Mo(Si0.6,Al0.4)2涂层表面生成致密氧化膜。
短句来源
     Oxide fiber/oxide ceramic matrix composites can work under the high temperature oxidation environment for a long time, which are one of the most promising high temperature structure ceramic materials.
     氧化物纤维/氧化物陶瓷基复合材料可以在高温氧化环境下长时间工作,是最有发展潜力的高温结构陶瓷材料之一。
短句来源
  “oxidation environment”译为未确定词的双语例句
     It is found that in the kaolinites formed in the acid-reduction environment Fe exists mainly in the form of Fe2+ replacing Al3+ and ferrous-oxide and in those formed in the oxidation environment, Fe exists mainly in the form of Fe3+ replacing Al3+ and ferric-oxide.
     结果表明,在酸性还原条件下形成的高岭石中,铁主要以Fe2+的形式置换结构中的Al3+,同时也有部分铁以亚铁化合物形式存在;
短句来源
     The Ce anomaly indicate a high oxidation environment and inheritance of orginal region.
     含稀土磷块岩普遍具 Ce负异常 ,显示其对源区的继承性 ,指示成磷环境处于氧化程度相对较高状态。
短句来源
     The West Taihu Lake is of algaetype with high production and high eutrophication and is characterized by oxidation environment and flourishing algae.
     目前湖泊生产力较高,富营养化程度高,表现为藻型湖泊特征;
短句来源
     REE-bearing phosphorite has Ce anomaly, showing succession of original region and high oxidation environment during phosphorite formation.
     含稀土磷块岩普遍具Ce的负异常,显示其对源区的继承性,也指示成磷环境处于氧化程度相对较高状态。
短句来源
     Auriferous M I granite was resulted from the late stage fractional melting of the lower crust source rock which pocessed high degree of partial melting and oxidation environment.
     MI 型花岗岩是在下地壳源岩分离熔融晚阶段、源岩部分熔融程度较高、环境较氧化的条件下形成的。
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  oxidation environment
Hence, it is evident that although the aluminide coating provides relatively adequate resistance towards oxidation environment, this protection was ineffective under the SO2-bearing atmosphere.
      
The hematite usually developed in an oxidation environment with warm and wet climate.
      
The crystalline V2O5 phase is not affected by the butane oxidation environment.
      
Dry oxygen environment was also used to investigate the tribological behavior in a severe oxidation environment.
      


This paper presents a double-layer structure model of uranlum-bearing horizon, i. e. uranium-bearing horizon =source rock (arkose red beds) + uranium trap (grey beds favourable to uranium precipitation) in inland basins of medium to big size, Northwest China. The mechanism of its formation is: during diagenetic-epigenetic processes resulted in arkose red bed formation, feldspar was hydromicatized, feldspar and quartz Were replaced by authigenic hematite, goethite and hydrogoethite and became red. In such oxidation...

This paper presents a double-layer structure model of uranlum-bearing horizon, i. e. uranium-bearing horizon =source rock (arkose red beds) + uranium trap (grey beds favourable to uranium precipitation) in inland basins of medium to big size, Northwest China. The mechanism of its formation is: during diagenetic-epigenetic processes resulted in arkose red bed formation, feldspar was hydromicatized, feldspar and quartz Were replaced by authigenic hematite, goethite and hydrogoethite and became red. In such oxidation process, part of uranium in detritus of silicates such as feldspar, quartz etc. was mobilized and released, but the released uranium can not be preciPitated bemuse of the oxidation environment, and it can be diffused during diagenetic dehydration and then precipitated in nearby grey beds with low Eh together with uranium-bearing "stagnant water" fixed in pores, forming economic uranium concentration. It is evident that uranium deposit could not be formed owing to uranium dispersion in the case of absence of certain pervious grey beds rich in reductants, although arkose red beds could provide Sufficient uranium source. Therefore, only the two conditions existed simultaneously,could the uraniumbearing horizons be formed. The significance of the model for uranium prospecting are as follows: 1. Uranium source range is much expanded concerning uranium prospecting in sandstone. Except the source in basement of the basin and its margins, we must also pay attention to the overlying red beds, especially the arkose red beds tn inland basin of medium to big aide. 2. For the potential assesment of basin and the selection of potential area, the model is an important prospecting ertterion. 3. If we apply the main criterion uranium-bearing horizon——arkose red beds well, the buried ore bodies can be found provided that arkose red beds were regarded as a significant criterion of uraniumbearing horizon

本文提出了西北大、中型内陆盆地内的生铀层双层结构模式,即生铀层=铀源层(长石砂岩红层)+积铀层(能使铀沉淀的灰色层)。其形成机理是:在形成长石砂岩红层的成岩后生作用中,长石被水云母化,长石、石英被自生的赤铁矿、针铁矿及水针铁矿所交代而变红。在这种氧化作用中,长石、石英等硅酸盐类矿物碎屑中的微量铀部分被活化释放出来。由于该层为氧化环境,释放出来的铀不能沉淀,只能和原来储存在孔隙间的含铀“囚水”一起,在成岩脱水过程中扩散到与其紧相邻的Eh值低的灰色还原层位中沉淀,形成铀的工业富集。由此可见,假若没有具备一定渗透性的富含还原剂的灰色层,尽管长石砂岩红层能提供足够的铀源,却形成不了铀矿床,只能分散掉。因此,只有当二者同时出现时,才能够形成铀矿床的生铀层位。该模式在找矿中的意义主要有三点;1.扩大了砂岩找矿中的铀源范围,我们除了应注意基底的铀源及盆地边缘外,现在还应注意大、中型内陆盆地中的上覆红层,特别是长石砂岩红层的铀源;2.在盆地成矿远景评价及其远景区段的选择上,这个模式是一个重要的找矿判据;3.若能较好地运用生铀层的主要标志长石砂岩红层,还有助于攻深找盲,预测深部的盲矿体。

In the previous papers, the writer discussed the general geological structure and mineralization process of Xitieshan stratiform base metal ore deposit. In this paper the writer is going to discuss the metal zone and geochemical environment of formation of the deposit. The Xitieshan Pb-Zn sulfide ore deposit occurs in the paleozoic greenstone belt, which by means of the fossil and isotopic determination blongs to ordovician volcanic-sedimentary complex. During the Qilian orogeny, the rocks were intensely folded...

In the previous papers, the writer discussed the general geological structure and mineralization process of Xitieshan stratiform base metal ore deposit. In this paper the writer is going to discuss the metal zone and geochemical environment of formation of the deposit. The Xitieshan Pb-Zn sulfide ore deposit occurs in the paleozoic greenstone belt, which by means of the fossil and isotopic determination blongs to ordovician volcanic-sedimentary complex. During the Qilian orogeny, the rocks were intensely folded and suffered a low grade metamorphism. According to the stratigraphic geology, this belt may be divided into three volcanic-sedimentary cycles, each of which contains facies from shallow water rich-organic basin sedimentary facies to deep turbiditic facies. From lower part to upper part, the mineralization shows a characteristically zonal distribution: sulfide (pyrite+galena+sphalerite) hosted by carbonaceous shale, turfs and carbonate→barite→ferruginons chert layers hosted by greywackes in the secondary volcanic-sedimentary cycle. Laterally these sulfide ores change to manganese ore, with a longth more than 4 km. The relationship between the Pb-ZnBa-Fe (Mn) zone and sedimentary facies suggests that it should be a transition from a reduction environment to an oxidation environment. The vertical ( Pb-Zn-Ba-Fe-Mn ) and lateral ( Pb-Zn-Fe-Mn ) zones may be considered to be a normal stratigraphic series, and bouderies of the sedimentary basin. The volcanic pyroclastic material is found within carbonaceous shale and strata interbedded with thin layers of turfs, both suggest that the deposit was formed by subaqueous exhalative processes and that exhalatire activety had growth of volcanics and took place in many stages.

产在南祁连地槽带内的锡铁山层状铅锌矿床,是我国西部已知的重要铅、锌矿床之一。依据研究其容矿岩石主要为一套多旋回的火山沉积岩系,岩系底部为具双峰型的钙碱质火山组合,顶部为基性(枕状)熔岩和辉长—闪长岩组成的火山—侵入岩组合。硫化物(黄铁矿+闪锌矿+方铅矿)层主要赋含在两种火山组合之间的大理岩、碳质板岩、绿泥板岩及薄层凝灰岩组成的层位内。在碳质板岩和绿泥板岩内亦见有凝灰物质。从硫化物层向上改变为浊流相硬砂岩沉积,矿化作用则相应改变为重晶石和含铁(锰)硅质岩(燧石),形成自下而上的硫化物→重晶石→含铁(锰)硅质岩的垂向金属分带。矿床中的黄铁矿保留有环带状及草莓状黄铁矿等原生组构,铅锌矿石部分显示受后期活化的伟晶硫化物集合体。依矿床地质和稳定同位素资料具有多期(原始沉积和后期活化改造)成矿作用。与世界上如欧洲的麦根矿床、腊梅尔斯伯格矿床,加拿大的苏列文矿床,澳大利亚的麦克阿瑟河矿床,以及我国秦岭南坡泥盆纪成矿期的一些矿床比较,如从腐泥相到浊流相的沉积环境,硫化物层的高碳质含量,所含火山物质和垂向(侧向)金属分带都有许多类似之处,但缺乏层状硫化物下盘的蚀变带和(网)脉状矿化以及礁相层等又可分别与之相区别。

In the previous papers, the writer discussed the general geological structure and mineralization process of Xitieshan stratiform base metal ore deposit. In this paper the writer is going to discuss the metal zone and geochemical envi- ronment of formation of the deposit. The Xitieshan Pb-Zn sulfide ore deposit occurs in the paleozoic greenstone belt, which by means of the fossil and isotopic determination blongs to ordo- vician volcanic-sedimentary complex. During the Qilian orogeny, the rocks were intensely...

In the previous papers, the writer discussed the general geological structure and mineralization process of Xitieshan stratiform base metal ore deposit. In this paper the writer is going to discuss the metal zone and geochemical envi- ronment of formation of the deposit. The Xitieshan Pb-Zn sulfide ore deposit occurs in the paleozoic greenstone belt, which by means of the fossil and isotopic determination blongs to ordo- vician volcanic-sedimentary complex. During the Qilian orogeny, the rocks were intensely folded and suffered a low grade metamorphism. According to the stratigraphic geology, this belt may be divided into three volcanic-sedimentary cycles, each of which contains facies from shallow water rich-organic basin sedimentary facies to deep turbiditic facies. From lower part to upper part, the mineralization shows a characteristically zonal distribution: sulfide (pyrite+galena+sphalerite) hosted by carbonaceous shale, tufts and car- bonate→barite→ferruginous chert layers hosted by greywackes in the secondary volcanic-sedimentary cycle. Laterally these sulfide ores change to manganese ore, with a longth more than 4 km. The relationship between the Pb-Zn- Ba-Fe(Mn)zone and sedimentary facies suggests that it should be a transi- tion from a reduction environment to an oxidation environment. The vertical(Pb-Zn-Ba-Fe-Mn) and lateral(Pb-Zn-Fe-Mn) zones may be considered to be a normal stratigraphic series, and bouderies of the sedimentary basin. The volcanic pyroclastic material is found within carbona- ceous shale and strata interbedded with thin layers of tufts, both suggest that the deposit was formed by subaqueous exhalative processes and that exhala- tire activety had growth of volcanics and took place in many stages.

产在南祁连地槽带内的锡铁山层状铅锌矿床,是我国西部已知的重要铅、锌矿床之一。依据研究其容矿岩石主要为一套多旋回的火山沉积岩系,岩系底部为具双峰型的钙碱质火山组合,顶部为基性(枕状)熔岩和辉长-闪长岩组成的火山-侵入岩组合。硫化物(黄铁矿+闪锌矿+方铅矿)层主要赋含在两种火山组合之间的大理岩、碳质板岩、绿泥板岩及薄层凝灰岩组成的层位内。在碳质板岩和绿泥板岩内亦见有凝灰物质。从硫化物层向上改变为浊流相硬砂岩沉积,矿化作用则相应改变为重晶石和含铁(锰)硅质岩(燧石),形成自下而上的硫化物→重晶石→含铁(锰)硅质岩的垂向金属分带。矿床中的黄铁矿保留有环带状及草莓状黄铁矿等原生组构,铅锌矿石部分显示受后期活化的伟晶硫化物集合体。依矿床地质和稳定同位素资料具有多期(原始沉积和后期活化改造)成矿作用。与世界上如欧洲的麦根矿床、腊梅尔斯伯格矿床,加拿大的苏列文矿床,澳大利亚的麦克阿瑟河矿床,以及我国秦岭南坡泥盆纪成矿期的一些矿床比较,如从腐泥相到浊流相的沉积环境,硫化物层的高碳质含量,所含火山物质和垂向(侧向)金属分带都有许多类似之处,但缺乏层状硫化物下盘的蚀变带和(网)脉状矿化以及礁相层等又可分别与之相区别。

 
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