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Poster Session P
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Thermal images and the search for Uranium Metallogenic Province
Yu Baoshan
(Principle Author)
Wang Dianbai, Jin Shiba and Qiao Rui, ect. May, 1992
Shenyang 240 Research Institute of North EastGeologic Exploration of Nuclear Industry
Abstract
In this paper, authors have a discussion on thermal images spot halo of the satellite images (TM and MSS) and the application of prognostic to uranium metallagenetic province. The term “thermal images spot halo “TISH” is used to mean the pixel which have anomaly thershalo value of Remote Sensing information field that taken out of the satellite Remote Sensing image computer because it is useful to search for uranium ore deposit. The appearance of them is due to various different processes – the surface thermal island effecting and the geothermal energy resources and so on reason, and which is caused by radioactive disintegration of the uranium mineral, either.
In this paper, authors take Lian Shanguan uranium ore deposit in the East Liaoning of China uranium metallogenic region as a example to discuss that casual relationship exists between TISH and the linear ring brush (or bogen) structure, and the tectonic alternation zone, and the uranium mineralize band, and the discuss that variations of in heat infrared radiation temperature, and variations of in frequency spectrum value of TISH here, too. And the TISH genesis, type and pattern are distinguished.
In this paper, authors think that TISH palsy an important role in the search for uranium metallogenic province.
In this paper, the term “thermal images spot halo” “TISH” is used to mean the pixel which has anomaly threshold value of Remote Sensing information field that taken out of the satellite Remote Sensing images by the images computer because it is useful to search for earth’s surface thermal island effecting and/or the geothermal energy resources and so on reason, and which is caused by radioactive disintegration of the uranium mineral, either.
According to math ematical statistics which is studying the Yanliko uranium metallogenic belt that is 1:50000 scale, thermal images spot haloes (TISH) usually appear at areas of uranium deposit. U-th radioactive anomaly higher belt where was known us and intercept (interconnection) areas of the linear ring brush structure. Because of this accidental find which have caused greatly interests of the authors.
By the thermal infrared radiation theory, authors think that objectives which on the earth’s surface, in especial to thermal anomaly ground object, all of them are the information of hot that is thermal infrared radiate energy. We have already processed a series of Remote Sensing images (especially thermal images) with different digital processing on the images computer and a series of a ground object spectrum test by instrument at field and the laboratory. We have obtained “thermal information” having
latency cause of formation with thermal radiation, that is to say “TISH”
As everyone knows, the thermal radiation is a complex physical process. Thermal radiant energy depends on radiant flux of matter, which depending on emittance and kinetic temperature Tkin again, that is Fr – ED Tkin4. In this function, l is Stefan.
Boltzmann’s contant : 5.67x10-12w/cm2, K4, is matter’s emittance. Different mater, there is different emittance in 812um wavelength.
In function of Fr- e l Tkin4, because of D is a constant, so when kinetic temperature Tkin keeps constant also, the value of radiant flux Fr will increase keeping pace with the e. And that can certainly appear some information in Remote Sensing images (in special thermal images), we call them “thermal images spot haloes”.
We have the knowledge of some places can produce “TISH” coming from field practice and digital image processing, such as the geothermal energy, the nudation, the stope, the stilling pond, the populated area, the uranium ore deposit and the structure knot.
In radioactive mineral decay theory, decay process follows thermal information, its value relates to the geometric form, the size and burial depth of orebody. Which kind of “TISH” does radioactive mineral exactly relate to? This is our interested problem.
In order to clarify the problem, we have studies ore-bearing lithology, rock character and country rock alteration of Liaodong Lian Shanguan uranium ore deposit. Dig. (1,2,3,4,). The ore-bearing rocks of the deposit are plagiomphinolite, genesis, leptynite, shale and carbonate and so on rocks of Archean Craton and Early proterozoic Aulacogen. The types do uranium deposits and mineralization characteristics : the iron-uranium type in Archean Si-Fe formation, the single uranium deposit in Early proterozoic terrigenous clastic rock formation, Boron-uranium type deposit in Early proterozoic boron-bearing volcanic series uranium-thorium-rare earth element deposit Indosinian alkaline rocks and so on. In studying we have knowledges of the metallogenic host rock granularity of the particles becomes smaller eh increasing content of uranium, and these is clear phenomena of the mineral crush and distortion, stronger retreated metamorphism, strong recrystallization decreasing K feldspar, increasing albite and content of ferromagnesian mineral such as biotite and material of argillaceous carbon black which were permeated into between of the chink that is mineral particles and the structures crevice. It is thus clear that the metallogenic host rock has characters of violet abeorbing and emitting far infrared wave. Near the structure and the contact zone, the alteration is intense, K-feldspar, albite and quarts of the particles which pour metasomateum into the wall rock that assumes the stringer and the lumpy forms. The biotite-quarts schist also associated that sercitizatiion, carbonation and chloritization. The quartzite, besides sericitization and chloritization, which were distinct phenomena of the silification, pyritization, zositization and the retreated metamorphism recry stallization also: wall-rock alteration of the near mineral and mineral constitute are also complex.
The study of far-infrared radiation temperature contributing factor indicating that the mean of the geologic body’s emittance is bigger, of which the composition (in especial ferromagesiam more than other composition) is complex. It causes the increase of the far infrared radiant temperature (Tkin) and radiant flux (Fr). The other reason of the above-mentioned is the texture and structure of the wall rock which is near mineral have been charged and porosity of the between mineral particle were becoming bigger.
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