Association of Sandstone-Type Uranium Mineralization in the Northern China with Tectonic Movements and Hydrocarbons
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Uranium ore
Uraninite
In order to understand the distribution of Carboniferous-Permian in Ejina Banner and its vicinities,and provide evidence for oil and gas resources investigation and evaluation,through fine processing and interpretation of previous data and newly finished integrated geophysical survey sections,by using joint inversion of gravity,magnetic and electronic data under restriction of seismic and well data,this paper preliminarily presented the distribution and burial situation of Carboniferous-Permian residues in the region.Thus it is concluded that the Carboniferous-Permian strata show the characteristics of thicker residual and suitable depth.The method has solved the technical problem of Carboniferous-Permian distribution interpretation and provides evidence for Carboniferous-Permian research within the internal part of the basin.
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Inner mongolia
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The term formation is the basic lithostratic unit which is divided based on the lithological characters. The Carboniferous Permian strata developed well in the Deriangma Xiala section and the Angjie section in Shenzha, Tibet. All the lithostratic units of the Carboniferous and Permian strata in this area were named after them. However, some of them were not defined based on the lithological characters but on the fossil assemblages in the sections, and do not accord with the principle of the multiple stratigraphical classification. And the lithostratic system of the Carboniferous Permian has been a controversial subject for a long time. The lithostratic systems of the Carboniferous Permian in the area are manily remarked by the author in the present paper, and the Carboniferous Permian boundary is discussed briefly.
Section (typography)
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Based on field observations,microscope,X-ray diffraction,QEMSCAN and electron microprobe techniques,this paper studies in detail the mineral composition,texture and structure of uranium ore of the alaskitetype uranium deposit in the Gaudeanmus area,Namibia.Uranium minerals of this area are mainly uranium oxides,U-Ti-oxides and uranium silicates,in which,uranium oxides include uraninite,pitchblende and thor-uraninite;UTi-oxides include brannerite,betafite,uranpyrochlore and euxenite;uranium silicates include uranophane,coffinite and uranothorite.Uraninite,thor-uraninite and U-Ti-oxides are mostly panidiomorphic or hypidiomorphic granular texture,disseminated structure,and most of pitchblende and uranium silicates are aphanocrystalline texture,metasomatic relict texture and veined structure.Thus,the alaskite-type uranium deposit of this area was formed together by the original magma crystallization differentiation,later hydrothermal reformation and supergenesis.
Uraninite
Uranium ore
Texture (cosmology)
Metasomatism
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T he recurrence of Carboniferous species in Permian strata is not new to palæontologists; for recurrent species from the Carboniferous fauna, and such as were supposed to be recurrent, have been noticed by several observers. Messrs. Lonsdale, Jones, Howse, King, and Davidson, as well as others, have identified Permian with Carboniferous species, or vice versâ , though it may be remarked that in some cases their determinations have been undoubtedly erroneous. The discovery of another species which had long been thought characteristic of the Permian period, in Carboniferous strata, is therefore not so novel a fact as might appear at first sight. At the same time, I deem it well to record its occurrence, which is not without importance. It is of interest merely as the discovery of another species which is common to the faunæ of the two later palæozoic eras; and it is of consequence as a fact which assists in illustrating some of the physical conditions which prevailed during the deposition of the Upper Coal-measures of the North of England. In the Permian formation, Lingula Credneri is confined to the lower strata. In England it is restricted to the “Marl-slate,” and the lower beds of the “Compact Limestone.” It is not common in these members, having been found only at Ferry Hill, Thrislington, and Thickley. As a Carboniferous shell it only occurred to me during the summer of last year (1858), at the Ryhope Winning, near Sunderland. I first observed it in a thin bed of dark shale, at
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This paper reviews the sedimentary systems, oil-gas bearing systems of the Carboniferous and Permian and typical oil and gas fields in northwestern China. It suggests that the Carboniferous and Permian are important sequences for petroleum exploration due to their bright potentials and prospects. Also, this paper gives some favorable areas for further exploration.
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