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.
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.
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;
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.
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;
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.
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.
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.
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
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.
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.
oxidation environment
氧化环境
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