1. A method for obtaining key altered mineral combinations of sodium-substituted rock type uranium ores is characterized by comprising the following steps: the method comprises the following steps:

step 1, preprocessing high-resolution remote sensing data;

step 2, correcting the high-resolution remote sensing data preprocessed in the step 1 in the atmosphere to obtain a surface feature reflectivity image;

step 3, establishing extraction models of hematite information, chlorite information and carbonate information;

and 4, performing band operation on the surface feature reflectivity image obtained in the step 2 by using the hematite information, chlorite information and carbonate information extraction model obtained in the step 3 to respectively obtain hematite information, chlorite information and carbonate distribution information, so as to complete the acquisition of the key altered mineral combination of the sodium interbite type uranium ore.

2. The method for obtaining the key altered mineral composition of the sodium-interbedded rock type uranium ore according to claim 1, wherein: the preprocessing of the high-resolution remote sensing data in the step 1 comprises radiation correction, geometric correction, image cutting and mosaic.

3. The method for obtaining the key altered mineral composition of the sodium interbite type uranium ore according to claim 2, wherein: and 2, the atmospheric correction of the high-resolution remote sensing data in the step 2 is obtained by adopting a quick atmospheric correction method or selecting a FLAASH atmospheric correction method.

4. The method for obtaining the key altered mineral composition of the sodium-interbedded rock type uranium ore according to claim 3, wherein: the step 3 specifically comprises the following steps: step 3.1, establishing a model for extracting hematite information according to hematite reflection spectrum characteristic wave bands corresponding to the atmospheric corrected high-resolution remote sensing data in the step 2;

step 3.2, establishing a model for extracting chlorite information according to the chlorite reflection spectrum characteristic wave band corresponding to the high-resolution remote sensing data after atmospheric correction in the step 2;

and 3.3, establishing a model for extracting chlorite information according to the carbonate reflection spectrum characteristic wave band corresponding to the atmosphere corrected high-molecular remote sensing data in the step 2.

5. The method for obtaining the key altered mineral composition of the sodium-interbedded rock type uranium ore according to claim 4, wherein: the characteristic wave bands of the hematite reflection spectrum corresponding to the remote sensing high-score data in the step 3.1 are absorption peaks at the positions of the visible-near infrared 3 rd and 7 th wave bands and strong reflection peaks at the 6 th wave band, and the reflectivity values of the visible-near infrared 3 rd, 6 th and 7 th wave bands are respectively marked as B3, B7 and B6; the model for extracting hematite information from high-grade remote sensing data is (B6 GT B7) AND (B6 GT B3) AND ((B6+ 2B3) LT 3B 4) (2B 6-B3-B7), B4 is the reflectivity value of the visible-near infrared 4 th wave band, GT is greater, AND LT is smaller.

6. The method for obtaining the key altered mineral composition of the sodium-interbedded rock type uranium ore according to claim 5, wherein: the hematite spectral signature in said step 3.1 is B6 > B3 and B6 > B7; the formula of the reflectivity spectrum curve of the hematite is (B6+2B3) < 3B 4.

7. The method for obtaining the key altered mineral composition of the sodium-interbedded rock type uranium ore according to claim 6, wherein: the chlorite reflection spectrum characteristic wave band corresponding to the high-resolution remote sensing data in the step 3.2 is three wave bands of 6 th, 7 th and 8 th of short wave infrared, and the reflectivity values of the three wave bands of 6 th, 7 th and 8 th are respectively marked as B ' 6, B ' 7 and B ' 8; the model for extracting chlorite information from the high-resolution remote sensing data is (B ' 6GT B ' 7) AND (B ' 6GT B ' 8) AND ((9B ' 6+ 14B ' 8) GT 23B ' 7).

8. The method for obtaining the key altered mineral composition of the sodium-interbedded rock type uranium ore according to claim 7, wherein: the chlorite spectrum in the step 3.2 is characterized in that B '6 > B' 7 and B '6 > B' 8; the formula of the chlorite reflectivity spectrum curve is

9. The method for obtaining the key altered mineral composition of the sodium-interbedded rock type uranium ore according to claim 8, wherein: the characteristic wave bands of the reflection spectrum of the carbonate information corresponding to the high-resolution remote sensing data in the step 3.3 are three wave bands of 6 th, 7 th and 8 th short-wave infrared, and the reflectivity values of the three wave bands are respectively marked as B ' 6, B ' 7 and B ' 8; the model for extracting carbonate information from the high-molecular remote sensing data is (B6 'gtb' 7) AND (B '7 GT B' 8) AND ((9B '6 + 14B' 8)/23B '7) GT 0.9) AND ((9B' 6+ 14B '8)/23B' 7) LT 1.1).

10. The method for obtaining the key altered mineral composition of the sodium-interbedded rock type uranium ore according to claim 9, wherein: the carbonate information spectrum in step 3.3 is characterized by B '6 > B' 7 and B '7 > B' 8; the formula of the reflectivity spectrum curve of the carbonate is

11. The method for obtaining the key altered mineral composition of the sodium-interbedded rock type uranium ore according to claim 10, wherein: the specific steps of the step 4 are as follows:

step 4.1, carrying out waveband calculation on the surface feature reflectivity image obtained in the step 2 by using visible-near infrared 3 rd, 4 th and 6 th wavebands of high-resolution remote sensing data through a hematite extraction model (B6+2B3) < 3B4 obtained in the step 3.1 to obtain hematite distribution information;

step 4.2, using the high-resolution remote sensing data short wave infrared 6 th, 7 th AND 8 th wave bands, performing wave band operation on the ground object reflectivity image obtained in the step 2 through a chlorite extraction model (B ' 6GT B ' 7) AND (B ' 6GT B ' 8) AND ((9B ' 6+ 14B ' 8) GT 23B ' 7) obtained in the step 3.2, AND obtaining chlorite distribution information;

AND 4.3, performing band calculation on the ground object reflectivity image obtained in the step 2 by using the 6 th, 7 th AND 8 th bands of the high-resolution remote sensing data AND using a carbonate extraction model formula (B6 'gtb' 7) AND (B '7 GT B' 8) AND ((9 '; 6+ 14'; B '8)/23'; 7) GT 0.9) AND ((9 '; 6+ 14'; B '8)/23'; 7) LT 1.1) obtained in the step 3.3 to obtain carbonate distribution information.

12. The method for obtaining the key altered mineral composition of the sodium interbite rock type uranium ore according to any one of claims 1 to 11, wherein: the high-resolution remote sensing data is Worldview-3 satellite high-resolution remote sensing data.

Background

In view of the increasing demand for uranium resources in the current complex international environment and nuclear power development, the importance of domestic uranium resource exploration is increasing day by day. Sodium interbite type uranium ore is an important uranium ore type, and the acquisition technology of key ore-forming elements of the sodium interbite type uranium ore needs to be more emphasized.

According to scientific research achievements of a plurality of former uranium ore geology researchers, the sodium interbedded rock type uranium ore has close relationship with altered minerals such as hematite, chlorite, carbonate and the like, and the three minerals in the sodium interbedded rock often exist at the same time and are important ore finding marks of the sodium interbedded rock type uranium ore. In addition, because red iron mineralization, chlorite petrifaction and carbonatation are very common hydrothermal alteration minerals, the red iron mineralization also tends to develop in other minerals and is an important mineral finding sign of some metal minerals.

Hematite is a good iron ore. The hematite mineralization is closely related to medium and low temperature hydrothermal uranium mineralization, and the alteration develops widely in uranium deposits produced by granite, diabase, brilliant porphyry, granite porphyry, rhyolite, volcaniclastic rock and volcanic sedimentary rock.

Hydrothermal uranium ore, porphyry copper ore and other various hydrothermal metal minerals are mostly related to chlorite, and the extraction of chlorite information is beneficial to the exploration and research work of the metal minerals.

Carbonate is a mineral which is very common on the surface, such as limestone, dolomite and corresponding metamorphic rocks, and the like, and also carbonate minerals formed by hydrothermal alteration, such as calcite, siderite, iron dolomite, magnesite, and the like. The sedimentary carbonate may form calcium-bonded-rock type uranium ore, silicalite type multi-metal ore bed formed by cross-substitution, and hydrothermal-origin uranium ore, copper ore, lead-zinc ore, iron ore, etc. Therefore, how to accurately extract carbonate information is very important to the efficiency and accuracy of the mineral exploration.

The remote sensing has the advantages of being fast and capable of covering a large area, accurately and precisely identifying the alteration information, and is a premise that the remote sensing technology is applied to geological exploration. The hyperspectral remote sensing data has very high resolution precision on the extracted altered mineral types, but the space resolution of the satellite hyperspectral remote sensing is very low, and the aviation hyperspectral data which has both high space resolution and hyperspectral resolution is difficult to obtain, so that the mineral type subdivision on the altered minerals extracted from the satellite hyperspectral data which is easy to obtain is very important.

Disclosure of Invention

The invention aims to provide a method for acquiring a sodium interbed rock type uranium ore key altered mineral combination, which can be used for quickly and accurately extracting hematite, chlorite and carbonate information so as to acquire the sodium interbed rock type uranium ore key altered mineral.

The technical scheme of the invention is as follows:

a method for obtaining key altered mineral combinations of sodium-intercrossed rock type uranium ores comprises the following steps:

step 1, preprocessing high-resolution remote sensing data;

step 2, performing atmospheric correction on the high-resolution remote sensing data preprocessed in the step 1 to obtain a surface feature reflectivity image;

step 3, establishing extraction models of hematite information, chlorite information and carbonate information;

and 4, performing band operation on the surface feature reflectivity image obtained in the step 2 by using the hematite information, chlorite information and carbonate information extraction model obtained in the step 3 to respectively obtain hematite information, chlorite information and carbonate distribution information, so as to complete the acquisition of the key altered mineral combination of the sodium interbite type uranium ore.

The preprocessing of the high-resolution remote sensing data in the step 1 comprises radiation correction, geometric correction, image cutting and mosaic.

And 2, performing atmospheric correction on the high-resolution remote sensing data in the step 2 by adopting a quick atmospheric correction method or selecting a FLAASH atmospheric correction method.

The step 3 specifically comprises the following steps: step 3.1, establishing a model for extracting hematite information according to hematite reflection spectrum characteristic wave bands corresponding to the atmospheric corrected high-resolution remote sensing data in the step 2;

step 3.2, establishing a model for extracting chlorite information according to the chlorite reflection spectrum characteristic wave band corresponding to the high-resolution remote sensing data after atmospheric correction in the step 2;

and 3.3, establishing a model for extracting chlorite information according to the carbonate reflection spectrum characteristic wave band corresponding to the atmosphere corrected high-molecular remote sensing data in the step 2.

The characteristic wave bands of the hematite reflection spectrum corresponding to the remote sensing high-score data in the step 3.1 are absorption peaks at the positions of the visible-near infrared 3 rd and 7 th wave bands and strong reflection peaks at the 6 th wave band, and the reflectivity values of the visible-near infrared 3 rd, 6 th and 7 th wave bands are respectively marked as B3, B7 and B6; the model for extracting hematite information from high-grade remote sensing data is (B6 GT B7) AND (B6 GT B3) AND ((B6+ 2B3) LT 3B 4) (2B 6-B3-B7), B4 is the reflectivity value of the visible-near infrared 4 th wave band, GT is greater, AND LT is smaller.

The hematite spectral signature in said step 3.1 is B6 > B3 and B6 > B7; the formula of the reflectivity spectrum curve of the hematite is (B6+2B3) < 3B 4.

The chlorite reflection spectrum characteristic wave band corresponding to the high-resolution remote sensing data in the step 3.2 is three wave bands of 6 th, 7 th and 8 th of short wave infrared, and the reflectivity values of the three wave bands of 6 th, 7 th and 8 th are respectively marked as B ' 6, B ' 7 and B ' 8; the model for extracting chlorite information from the high-resolution remote sensing data is (B ' 6GT B ' 7) AND (B ' 6GT B ' 8) AND ((9B ' 6+ 14B ' 8) GT 23B ' 7).

The green mud in the step 3.2The stone has spectral characteristics that B '6 is more than B' 7 and B '6 is more than B' 8; the formula of the chlorite reflectivity spectrum curve is

The characteristic wave bands of the reflection spectrum of the carbonate information corresponding to the high-resolution remote sensing data in the step 3.3 are three wave bands of 6 th, 7 th and 8 th short-wave infrared, and the reflectivity values of the three wave bands are respectively marked as B ' 6, B ' 7 and B ' 8; the model for extracting carbonate information from the high-molecular remote sensing data is (B6 'gtb' 7) AND (B '7 GT B' 8) AND ((9B '6 + 14B' 8)/23B '7) GT 0.9) AND ((9B' 6+ 14B '8)/23B' 7) LT 1.1).

The carbonate information spectrum in step 3.3 is characterized by B '6 > B' 7 and B '7 > B' 8; the formula of the reflectivity spectrum curve of the carbonate is

The specific steps of the step 4 are as follows:

step 4.1, carrying out waveband calculation on the surface feature reflectivity image obtained in the step 2 by using visible-near infrared 3 rd, 4 th and 6 th wavebands of high-resolution remote sensing data through a hematite extraction model (B6+2B3) < 3B4 obtained in the step 3.1 to obtain hematite distribution information;

step 4.2, using the high-resolution remote sensing data short wave infrared 6 th, 7 th AND 8 th wave bands, performing wave band operation on the ground object reflectivity image obtained in the step 2 through a chlorite extraction model (B ' 6GT B ' 7) AND (B ' 6GT B ' 8) AND ((9B ' 6+ 14B ' 8) GT 23B ' 7) obtained in the step 3.2, AND obtaining chlorite distribution information;

AND 4.3, performing band calculation on the ground object reflectivity image obtained in the step 2 by using the 6 th, 7 th AND 8 th bands of the high-resolution remote sensing data AND using a carbonate extraction model formula (B6 'gtb' 7) AND (B '7 GT B' 8) AND ((9 '; 6+ 14'; B '8)/23'; 7) GT 0.9) AND ((9 '; 6+ 14'; B '8)/23'; 7) LT 1.1) obtained in the step 3.3 to obtain carbonate distribution information.

The high-resolution remote sensing data is Worldview-3 satellite high-resolution remote sensing data.

The invention has the beneficial effects that: the method for acquiring the key altered mineral combination of the sodium-intercross rock type uranium mine uses the easily-acquired high spatial resolution image and expresses the spectral characteristics by the mathematical model, so that the hematite information can be quickly and accurately extracted. The method is simple and easy to operate, and the model for extracting the chlorite and the carbonate is established through the hematite reflection spectrum characteristic wave band corresponding to the satellite high-resolution remote sensing data after atmospheric correction, so that the carbonatation and chlorite petrochemical abnormal information can be accurately distinguished and extracted. Because the method uses remote sensing data, the coverage range is wide, and the abnormal alteration information extracted by the method is more objective and comprehensive than the information obtained by field route exploration.

Drawings

Fig. 1 is a flow chart of a method for obtaining a key altered mineral composition of a sodium-intercross rock type uranium ore provided by the invention;

FIG. 2 is a graph of hematite information provided by the present invention;

FIG. 3 is a graphical representation of chlorite information provided by the present invention;

FIG. 4 is a graph of carbonate information provided by the present invention.

Detailed Description

The method for obtaining the key altered mineral composition of the sodium-interbedded rock type uranium ore according to the present invention is described in detail below with reference to the accompanying drawings and examples.

The invention provides a method for acquiring a key altered mineral composition based on a sodium-intercross rock type uranium mine, which comprises the steps of preprocessing Worldview-3 high-resolution remote sensing data, including radiation correction, geometric correction, image cutting, embedding and the like; then, correcting atmosphere of Worldview-3 high-resolution remote sensing data to obtain a surface feature reflectivity image; establishing a fast extraction model of hematite information, chlorite information and carbonate information, and expressing spectral characteristics of the reflectivity of hematite, chlorite and carbonate; and finally, according to the hematite information, the chlorite information and the carbonate information extraction model, extracting hematite distribution information, chlorite distribution information and carbonate distribution information in the research area.

As shown in fig. 1, the method for obtaining the key altered mineral composition of the sodium-intercross rock type uranium ore provided by the invention specifically comprises the following steps:

in step 1, preprocessing the Worldview-3 satellite high-resolution remote sensing data

Preprocessing the Worldview-3 satellite high-resolution remote sensing data in the step 1 comprises radiation correction, geometric correction, image cutting and mosaic. The Worldview-3 satellite high-resolution remote sensing data used in the embodiment is Worldview-3 satellite high-resolution remote sensing data in the splendid attire region of the Longeh mountain of Gansu, and the splendid attire region of the Longeh mountain of Gansu is sodium-handed rock type uranium ore. The parameters of the Worldview-3 satellite high-resolution remote sensing data are shown in the following table 1:

TABLE 1 Gansu Longsho mountain east splendid achnatherum region Worldview-3 satellite high-score remote sensing data table

In step 2, atmospheric correction is carried out on the Worldview-3 satellite high-resolution remote sensing data preprocessed in step 1, and a surface feature reflectivity image is obtained

And performing atmospheric correction on Worldview-3 satellite high-resolution remote sensing data by adopting a quick atmospheric correction (QUAC) method to obtain a surface feature reflectivity image.

In the step 2, a FLAASH atmospheric correction method or other atmospheric correction methods with higher precision (such as methods based on radiation transmission models, such as Modtran, Lowtran, 6S and the like) can also be selected, and the precision of the atmospheric correction method directly influences the precision of information extraction of hematite, chlorite and carbonate.

In step 3, establishing an extraction model of hematite information, chlorite information and carbonate information, wherein the step 3 specifically comprises the following steps:

step 3.1, establishing a model for extracting hematite information according to hematite reflection spectrum characteristic wave bands corresponding to the atmosphere corrected Worldview-3 satellite high-resolution remote sensing data in the step 2

The hematite reflection spectrum characteristic wave bands corresponding to Worldview-3 satellite remote sensing high-score data are absorption peaks at positions of visible-near infrared wave bands 3 and 7 and a strong reflection peak at a 6 th wave band, and reflectivity values of the visible-near infrared wave bands 3, 6 and 7 are respectively recorded as B3, B7 and B6, so that hematite spectrum characteristics are that B6 is greater than B3 and B6 is greater than B7.

The hematite reflectance spectral curve is characterized by a convex rising curve from the visible-near infrared band 3 to the band 6, and can be represented by the following formula.

Namely, it isNamely (B6+2B3) < 3B 4.

Wherein B4 is a reflectance value of the visible-near infrared 4 th band, B3_{Center wavelength}、B4_{Center wavelength}、B6_{Center wavelength}Respectively refer to the central wavelength positions of the 3 rd, 4 th and 6 th visible-near infrared bands.

With the characteristics, a model for extracting hematite information from Worldview-3 satellite high-resolution remote sensing data is established according to the following formula:

(B6 GT B7)AND(B6 GT B3)AND((B6+2*B3)LT 3*B4)*(2*B6-B3-B7)。

b3, B4, B6 and B7 are reflectance values of four wave bands 3, 4, 6 and 7 of visible-near infrared of Worldview-3 satellite high-resolution remote sensing data respectively, GT shows that GT is greater, and LT shows that LT is less.

The objective of extracting hematite information by adjusting the depth grading of the first absorption peak was achieved according to (3 × B4)/(B6+2 × B3) > a, where a ≧ 1, a denotes a general constant.

Step 3.2, establishing a model for extracting chlorite information according to chlorite reflection spectrum characteristic wave bands corresponding to atmosphere corrected Worldview-3 satellite high-resolution remote sensing data in the step 2

The chlorite reflection spectrum characteristic wave band corresponding to the Worldview-3 satellite high-resolution remote sensing data is three wave bands of 6 th, 7 th and 8 th of short wave infrared, and the reflectivity values of the three wave bands of 6 th, 7 th and 8 th are respectively marked as B ' 6, B ' 7 and B ' 8. The chlorite has double absorption peaks, the first absorption peak corresponds to the 7 th wave band of short wave infrared, the second absorption peak corresponds to the 8 th wave band of short wave infrared, and one of the spectral characteristics of the chlorite is B '6 > B' 7 and B '6 > B' 8.

From the short wave infrared 6 th wave band to the 8 th wave band, relative to the single absorption peak, the double absorption peak makes the reflectance value of the short wave infrared 7 th wave band lower and causes the downward slip line to be concave, the chlorite reflectance spectrum curve formula is as follows.

Namely, it isWherein, B' 6_{Center wavelength}、Bˊ7_{Center wavelength}、Bˊ8_{Center wavelength}Respectively refer to the central wavelength positions of the 6 th, 7 th and 8 th wave bands of short wave infrared.

With the characteristics, a model for extracting chlorite information from Worldview-3 satellite high-resolution remote sensing data is established, and the model is as follows:

(Bˊ6GT Bˊ7)AND(Bˊ6GT Bˊ8)AND((9*Bˊ6+14*Bˊ8)GT 23*Bˊ7)。

wherein, B ' 6, B ' 7 and B ' 8 are respectively reflectance values of three wave bands of 6 th, 7 th and 8 th wave bands of Worldview-3 satellite high-resolution remote sensing data shortwave infrared, and GT represents larger than GT.

In addition, the purpose of extracting chlorite information by adjusting the depth of the first absorption peak in a grading way can be realized according to (9B ' 6+ 14B ' 8)/(23B ' 7) > a, wherein a is more than or equal to 1.

Step 3.3, establishing a model for extracting chlorite information according to the carbonate reflection spectrum characteristic wave band corresponding to the atmosphere corrected Worldview-3 satellite high-resolution remote sensing data in the step 2

The characteristic wave bands of the reflection spectrum of the carbonate information corresponding to the Worldview-3 satellite high-resolution remote sensing data are three wave bands of 6 th, 7 th and 8 th of short wave infrared, and the reflectivity values of the three wave bands are respectively marked as B ' 6, B ' 7 and B ' 8. The carbonate information is a single absorption peak which linearly decreases from the 6 th waveband to the 8 th waveband, and one of the spectral characteristics of the carbonate information is that B '6 > B' 7 and B '7 > B' 8.

From the 6 th wave band to the 8 th wave band of short wave infrared, the single absorption peak slides down linearly, and the carbonate reflectivity spectral curve formula is shown as follows.

Namely, it isBˊ6_{Center wavelength}、Bˊ7_{Center wavelength}、Bˊ8_{Center wavelength}Respectively refer to the central wavelength positions of the 6 th, 7 th and 8 th wave bands of short wave infrared.

With the characteristics, a model for extracting carbonate information from Worldview-3 satellite high-resolution remote sensing data is established as shown in the following formula:

(B6ˊGT Bˊˊ7)AND(Bˊ7GT Bˊ8)AND((9*Bˊ6+14*Bˊˊ8)/23*Bˊ7)GT 0.9)AND((9*Bˊ6+14*Bˊ8)/23*Bˊ7)LT 1.1)。

wherein, B ' 6, B ' 7 and B ' 8 are respectively reflectance values of three wave bands of 6 th, 7 th and 8 th wave bands of Worldview-3 satellite high-resolution remote sensing data shortwave infrared, GT is greater than, and LT is less than.

In step 4, performing band operation on the surface feature reflectivity image obtained in step 2 by using the hematite information, chlorite information and carbonate information extraction model obtained in step 3, and respectively obtaining hematite distribution information (figure 2), chlorite distribution information (figure 3) and carbonate distribution information (figure 4); thereby completing the acquisition of the key altered mineral combination of the sodium-intercrossed rock type uranium ore.

And 4.1, performing band operation on the ground object reflectivity image obtained in the step 2 by using visible-near infrared bands 3, 4 and 6 of high-resolution remote sensing data of a Worldview-3 satellite in the research area through a hematite information extraction model formula (B6+2B3) < 3B4 obtained in the step 3.1 to obtain hematite distribution information (figure 2) in the research area, wherein B3, B4 and B6 respectively represent the visible-near infrared bands 3, 4 and 6 of the Worldview-3.

Step 4.2, using the 6 th, 7 th AND 8 th wave bands of the shortwave infrared of the Worldview-3 satellite high-resolution remote sensing data in the research area, extracting a model formula (B '6 GT B' 7) AND (B '6 GT B' 8) AND ((9B '6 + 14B' 8) GT 23B '7) from the chlorite information obtained in step 3.2, AND performing wave band operation on the reflectivity image of the ground object obtained in step 2 to obtain the distribution information of the chlorite in the research area (fig. 3), wherein the reflectivity values of the 6 th, 7 th AND 8 th wave bands of the shortwave infrared of the Worldview-3 satellite high-resolution remote sensing data are respectively the reflectivity values of B' 6, B '7 AND B' 8, AND the reflectivity values are greater than GT.

Step 4.3, using the short wave infrared 6 th, 7 th, AND 8 th wave bands of the Worldview-3 satellite high-resolution remote sensing data in the research area, extracting model formulas (B6 ' gtb ' ″ 7) AND (B ' 7GT B '. 8) AND ((9B ' 6+ 14B ' 8)/23B ' 7) GT 0.9) AND ((9B ' 6+ 14B ' 8)/23B ' 7) LT 1.1) from the carbonate information obtained in step 3.3, AND performing a wave band operation on the ground object reflectance image obtained in step 2 to obtain carbonate distribution information in the research area (fig. 4), wherein the respective wave band values of the three wave bands of the infrared 6 th, 7 th, AND 8 th wave bands of the Worldview-3 data in B ' 6, B ' 7, AND B ' 8 are greater than AND represent that LT is smaller than GT.

Obtaining key altered mineral combinations of the sodium interbedded rock type uranium ores through the step 4.1, the step 4.2 and the step 4.3, and respectively obtaining hematite distribution information, chlorite distribution information and carbonate distribution information; thereby completing the acquisition of the key altered mineral combination of the sodium-intercrossed rock type uranium ore.

The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The prior art can be adopted in the content which is not described in detail in the invention.