CN106908855A - A kind of method that geochemistry element combinations are selected based on GIS spatial analysis - Google Patents
A kind of method that geochemistry element combinations are selected based on GIS spatial analysis Download PDFInfo
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Abstract
A kind of method that geochemistry element combinations are selected based on GIS spatial analysis, is comprised the following steps：Geochemical elements are pre-processed；Multi-fractal analysis of spectrum is carried out to the geochemical elements by pretreatment, and calculates Asymmetric Index；Geochemical elements to multifractal spectra left avertence carry out ROC curve analysis, calculate the value of the area AUC under the ROC curve of each geochemical elements and be used to check the value of AUC under different confidence levels with the Z of the difference of AUC=0.5AUCValue；Metallogenic geologic features are analyzed；According to metallogenic geologic features, Asymmetric Index, AUC and ZAUCGeochemical elements combination caused by comprehensive selection mineralization.The present invention can not only geochemical elements combination caused by objective selection mineralization, and the geochemistry reference frame for more having indicative significance can be provided for further mineral exploration.
Description
Technical field
GIS (Geographic Information are based on the present invention relates to earth science and technology field, more particularly to one kind
System, GIS-Geographic Information System) spatial analysis select geochemistry element combinations method.
Background technology
Mineral exploration faces new situations, looks for ore deposit environment to turn to complexity by simple, and the method for prospecting is quantified by qualitative steering, looks for ore deposit
Emphasis is by the area of coverage and deep ore deposit under superficial ore deposit steering complex geological condition.The mineral exploration especially earth under complex geological condition
Chemistry is reconnoitred and faces lot of challenges, such as due to the influence that buried depth and coating are shielded, causes ore information faint；Geological structure
Complexity, causes ore information to mix, and hardly possible is decomposed；The presence of coating often leads to that ore information is unintelligible, incomplete, difficult sentences
It is disconnected.How effectively to recognize and extract the key that weak slow geochemical anomaly under complex geological condition is current mineral exploration.Additionally,
China have accumulated a large amount of high-quality, multielement, multiple dimensioned geochemistry datas since 1978, these numbers
Also it is Global geochemical mapping according to not being only that the mineral exploration of China and environmental evaluation are made that significant contribution, the global earth
Important foundation has been established in the foundation of chemical reference net and the determination of Reference Geochemical Values etc..In this context, research and develop intricately
Exploration geochemistry data are made full use of and are redeveloped by geochemical anomaly identification and extractive technique under the conditions of matter, are entered
And extract caused by mineralization geochemical anomaly and drive exploration breakthrough, it appears it is particularly important.
Weak slow geochemical anomaly is known under the development complex geological condition from many spaces, multiple dimensioned and multielement etc. main at present
Other and extraction, such as empirical mode decomposition method, multi-fractal filtering techniques, local singularity method, local sane concentration coefficient method
With local Gap spatial statistics method.These methods generally need to be pre-processed using principal component analysis (or factorial analysis)
Dimensionality reduction is carried out, and seeks that geochemical elements combination caused by research area typical case's mineralization can be represented, recycle such as Empirical Mode
The methods such as formula decomposition method, local singularity carry out weak slow geochemical anomaly identification and extract.But select which element is carried out
Principal component or factorial analysis, and geochemical anomaly element combinations usually vary with each individual caused by how selecting mineralization,
Currently without unified understanding.
The content of the invention
In view of this, the invention provides a kind of method that geochemistry element combinations are selected based on GIS spatial analysis, should
Method can effectively extract geochemical anomaly caused by mineralization, more have indicative significance for further mineral exploration is provided
Geochemistry reference frame.
The present invention provides a kind of method that geochemistry element combinations are selected based on GIS spatial analysis, comprises the following steps：
Based on GIS, the geochemical elements to being collected into are pre-processed；
Multi-fractal analysis of spectrum is carried out to each geochemical elements by pretreatment, and it is geochemical to calculate each
The Asymmetric Index of element is learned, the numerical values recited of the Asymmetric Index reflects the asymmetry of multifractal spectra, described multiple
Dividing the asymmetry of shape spectrum includes that multifractal spectra left avertence, multifractal spectra right avertence and multifractal spectra are symmetrical, described many
Multifractal spectrum left avertence represents that geochemical elements are substantially enriched with survey region and is beneficial into ore deposit；
Geochemical elements to multifractal spectra left avertence carry out ROC (receiver operating
Characteristic, Receiver Operating Characteristics) tracing analysis, according to ROC curve analytical calculation each geochemical elements
The value of the area AUC under ROC curve and be used to check the value of AUC under different confidence levels with the Z of the difference of AUC=0.5AUC
Value, the AUC and ZAUCValue size reflection geochemical elements and known mineral deposit spatial relationship；
Metallogenic geologic features are analyzed, by reference to studying the ore_forming model and research heads in area, can be with
Tentatively judge geochemical anomaly caused by mineralization；
According to metallogenic geologic features, Asymmetric Index, AUC and ZAUCGeochemistry unit caused by comprehensive selection mineralization
Element combination.
Further, the Asymmetric Index for calculating each geochemical elements specifically includes following steps：
(2.1) survey region is divided into a series of square net that length of sides are ε, if μiIt is i-th square net
Interior amount of metal, according to multi-fractal Theory, sets up amount of metal μiWith the expression formula of ε：
In formula, αiIt is local singular exponent, local singular exponent αiCan reflect local into ore deposit singularity degree and ore deposit
Change enrichment degree, local singular exponent αiIt is limited in a finite interval [αmin,αmax], wherein-∞≤αmin≤αmax≤+
∞,αminIt is minimum local singular exponent, αmaxIt is maximum local singular exponent；
(2.2) the local singular exponent α of all local locations in survey region is asked fori, according to local singular exponent αi
Size square net is grouped, every group include limited local singular exponent αiIf, Nε(α) is each packet interior just
The number of square net, according to the multi-fractal features of geochemistry Elemental redistribution, sets up NεThe expression formula of (α) and ε：
Nε(α)∝ε-f(α)
In formula, f (α) represents the multifractal spectra of the Geochemical Distribution Models of Patterns；
(2.3) using local singular exponent αiAsymmetric Index R is solved, the computing formula of Asymmetric Index R is：
In formula：α (0) is corresponding local singular exponent when the tangent slope of f (α) is 0；R>1, represent multifractal spectra
Left avertence；R<1, represent multifractal spectra right avertence；R=1, represents that multifractal spectra is symmetrical.
Further, the ROC curve analysis specifically includes following steps：
(3.1) True Positive Rate is represented by ordinate of sensitiveness, false positive rate is represented by abscissa of specificity, drafting connects
Receptor's operating characteristic curve, if positive sample ithPredicted value be { xi, i=1,2 ... P }, negative sample jthPredicted value be { yj,j
=1,2 ... n }, the value to the area AUC under the ROC curve of each geochemical elements is solved, and the calculating of the value of AUC is public
Formula is：
In formula,
(3.2) to the variance S of AUCAUCSolved, SAUCComputing formula be：
In formula,
(3.3) to be used to check the value of AUC under different confidence levels with the Z of the difference of AUC=0.5AUCValue asked
Solution, ZAUCComputing formula be：
In formula, ZAUCObey standardized normal distribution, the value of AUC in the range of 0 to 1, AUC>0.5, represent geochemistry mould
Formula with have found mineral deposit there is significantly space correlation relation；The value of AUC is bigger, represents geochemical pattern and has found mineral deposit
Space correlation relation it is stronger.
The beneficial effect brought of technical scheme that the present invention is provided is：The present invention uses multi-fractal analysis of spectrum definitely ball
The spatial distribution and enrichment characteristics of chemical element, using ROC curve analysis multifractal spectra left avertence geochemical elements with
It was found that the Space Coupling relation in mineral deposit, and determine geochemistry element combinations with reference to metallogenic geologic features, these geochemistry unit
Element combination has recognition capability higher to geochemical anomaly caused by mineralization, and can effectively exclude noise
Interference, can provide the geochemistry reference frame for more having indicative significance for further mineral exploration.
Brief description of the drawings
Fig. 1 is a kind of schematic flow sheet of the method based on GIS spatial analysis selection geochemistry element combinations of the present invention.
Fig. 2 is the multi-fractal spectrogram of one embodiment of the invention.
Fig. 3 is the ROC curve analysis chart of one embodiment of the invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is further described.
Fig. 1 is refer to, geochemistry element combinations are selected based on GIS spatial analysis The embodiment provides one kind
Method, comprise the following steps：
S101, based on GIS, the geochemical elements to being collected into are pre-processed.
Each geochemical elements by pretreatment are carried out multi-fractal analysis of spectrum, and calculate each by S102
The numerical values recited of the Asymmetric Index R of geochemical elements, Asymmetric Index R reflects the asymmetry of multifractal spectra, multiple
Dividing the asymmetry of shape spectrum includes that multifractal spectra left avertence, multifractal spectra right avertence and multifractal spectra are symmetrical, multiple point
Shape spectrum left avertence represents that geochemical elements are substantially enriched with survey region and is beneficial into ore deposit.
The Asymmetric Index R for calculating each geochemical elements specifically includes following steps：
(2.1) survey region is divided into a series of square net that length of sides are ε, if μiIt is i-th square net
Interior amount of metal, according to multi-fractal Theory, sets up amount of metal μiWith the expression formula of ε：
In formula, αiIt is local singular exponent, local singular exponent αiCan reflect local into ore deposit singularity degree and ore deposit
Change enrichment degree, local singular exponent αiIt is limited in a finite interval [αmin,αmax], wherein-∞≤αmin≤αmax≤+
∞,αminIt is minimum local singular exponent, αmaxIt is maximum local singular exponent；
(2.2) the local singular exponent α of all local locations in survey region is asked fori, according to local singular exponent αi
Size square net is grouped, every group include limited local singular exponent αi, the local singularity in every group
Index αiIt is sufficiently close to, if Nε(α) is the number of square net in each packet, according to multiple point of geochemistry Elemental redistribution
Shape feature, sets up NεThe expression formula of (α) and ε：
Nε(α)∝ε-f(α)
In formula, f (α) represents the multifractal spectra of the Geochemical Distribution Models of Patterns, and with reference to Fig. 2, in an embodiment, f (α) is
One curve；
(2.3) using local singular exponent αiAsymmetric Index R is solved, the computing formula of Asymmetric Index R is：
In formula：α (0) is corresponding local singular exponent when the tangent slope of f (α) is 0；R>1, represent multifractal spectra
Left avertence；R<1, represent multifractal spectra right avertence；R=1, represents that multifractal spectra is symmetrical.
S103, the geochemical elements to multifractal spectra left avertence carry out ROC curve analysis, according to ROC curve analysis meter
Calculate the value of the area AUC under the ROC curve of each geochemical elements and be used to check the value of AUC under different confidence levels with
The Z of the difference of AUC=0.5AUCValue, AUC and ZAUCThe space of size reflection geochemical elements and known mineral deposit of value close
System.
ROC curve analysis specifically includes following steps：
(3.1) True Positive Rate is represented by ordinate of sensitiveness, false positive rate is represented by abscissa of specificity, drafting connects
Receptor's operating characteristic curve, Fig. 3 is the schematic diagram of ROC curve in an embodiment, if positive sample ithPredicted value be { xi, i=1,
2 ... P }, negative sample jthPredicted value be { yj, j=1,2 ... n }, to the area under a curve AUC of each geochemical elements
Value solved, the computing formula of the value of AUC is：
In formula,
(3.2) to the variance S of AUCAUCSolved, SAUCComputing formula be：
In formula,
(3.3) to be used to check the value of AUC under different confidence levels with the Z of the difference of AUC=0.5AUCValue asked
Solution, ZAUCComputing formula be：
In formula, ZAUCObey standardized normal distribution, in an embodiment, ZAUCValue in the range of -1.96 to 1.96；AUC
Value in the range of 0 to 1, AUC>0.5, represent geochemical pattern and have found mineral deposit with significantly space correlation pass
System；The value of AUC is bigger, represents that geochemical pattern is stronger with the space correlation relation for having found mineral deposit.
S104, analyzes metallogenic geologic features, by reference to studying the ore_forming model in area and the research to heads, can
Tentatively to judge geochemical anomaly caused by mineralization.
S105, according to metallogenic geologic features, Asymmetric Index, AUC and ZAUCIt is geochemical caused by comprehensive selection mineralization
Learn element combinations.
In one embodiment, typical ore deposits are analyzed, according to the metallogenic geologic features in mineral deposit, R>1、AUC>0.5 and ZAUC
>1.96, select geochemical elements combination caused by mineralization.
The present invention using multi-fractal analysis of spectrum definitely Geochemistry element spatial distribution and enrichment characteristics, using ROC
The geochemical elements of tracing analysis multifractal spectra left avertence and the Space Coupling relation for having found mineral deposit, and combine Ore-forming geology
Feature determines geochemistry element combinations, and the combination of these geochemical elements has to geochemical anomaly caused by mineralization
Recognition capability higher, and the interference of noise can be effectively excluded, can more there is finger for further mineral exploration is provided
Illustrate the geochemistry reference frame of justice.
In the case where not conflicting, the feature in embodiment herein-above set forth and embodiment can be combined with each other.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all it is of the invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (3)
1. it is a kind of based on GIS spatial analysis select geochemistry element combinations method, it is characterised in that comprise the following steps：
Based on GIS, the geochemical elements to being collected into are pre-processed；
Each geochemical elements by pretreatment are carried out with multi-fractal analysis of spectrum, and calculates each geochemistry unit
The Asymmetric Index of element, the numerical values recited of the Asymmetric Index reflects the asymmetry of multifractal spectra, the multi-fractal
The asymmetry of spectrum includes that multifractal spectra left avertence, multifractal spectra right avertence and multifractal spectra are symmetrical, described multiple point
Shape spectrum left avertence represents that geochemical elements are substantially enriched with survey region and is beneficial into ore deposit；
Geochemical elements to multifractal spectra left avertence carry out ROC curve analysis, according to each earth of ROC curve analytical calculation
The value of the area AUC under the ROC curve of chemical element and it is used to check the value of AUC under different confidence levels with AUC=0.5's
The Z of differenceAUCValue, the AUC and ZAUCValue size reflection geochemical elements and known mineral deposit spatial relationship；
Metallogenic geologic features are analyzed, by reference to studying the ore_forming model and research heads in area, can be preliminary
Judge geochemical anomaly caused by mineralization；
According to metallogenic geologic features, Asymmetric Index, AUC and ZAUCGeochemical elements group caused by comprehensive selection mineralization
Close.
It is 2. as claimed in claim 1 to be based on the method that GIS spatial analysis selects geochemistry element combinations, it is characterised in that：
The Asymmetric Index for calculating each geochemical elements specifically includes following steps：
(2.1) survey region is divided into a series of square net that length of sides are ε, if μiIt is the gold in i-th square net
Category amount, according to multi-fractal Theory, sets up amount of metal μiWith the expression formula of ε：
In formula, αiIt is local singular exponent, local singular exponent αiCan reflect local rich into ore deposit singularity degree and mineralising
Collection degree, local singular exponent αiIt is limited in a finite interval [αmin,αmax], wherein-∞≤αmin≤αmax≤+∞,
αminIt is minimum local singular exponent, αmaxIt is maximum local singular exponent；
(2.2) the local singular exponent α of all local locations in survey region is asked fori, according to local singular exponent αiIt is big
Small that square net is grouped, every group includes limited local singular exponent αiIf, Nε(α) is square in each packet
The number of grid, according to the multi-fractal features of geochemistry Elemental redistribution, sets up NεThe expression formula of (α) and ε：
Nε(α)∝ε-f(α)
In formula, f (α) represents the multifractal spectra of the Geochemical Distribution Models of Patterns；
(2.3) using local singular exponent αiAsymmetric Index R is solved, the computing formula of Asymmetric Index R is：
In formula：α (0) is corresponding local singular exponent when the tangent slope of f (α) is 0；R>1, represent that multifractal spectra is left
Partially；R<1, represent multifractal spectra right avertence；R=1, represents that multifractal spectra is symmetrical.
It is 3. as claimed in claim 1 to be based on the method that GIS spatial analysis selects geochemistry element combinations, it is characterised in that：
The ROC curve analysis specifically includes following steps：
(3.1) True Positive Rate is represented by ordinate of sensitiveness, false positive rate is represented by abscissa of specificity, draw recipient
Operating characteristic curve, if positive sample ithPredicted value be { xi, i=1,2 ... P }, negative sample jthPredicted value be { yj, j=1,
2 ... n }, the value to the area AUC under the ROC curve of each geochemical elements is solved, the computing formula of the value of AUC
For：
In formula,
(3.2) to the variance S of AUCAUCSolved, SAUCComputing formula be：
In formula,
(3.3) to be used to check the value of AUC under different confidence levels with the Z of the difference of AUC=0.5AUCValue solved,
ZAUCComputing formula be：
In formula, ZAUCObey standardized normal distribution, the value of AUC in the range of 0 to 1, AUC>0.5, represent geochemical pattern with
It has been found that mineral deposit has significantly space correlation relation；The value of AUC is bigger, represents geochemical pattern and the sky for having found mineral deposit
Between dependency relation it is stronger.
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| CN113408019A (en) * | 2021-06-23 | 2021-09-17 | 河北地质大学 | Water system sediment geochemical anomaly mapping method based on BME-GWR |
| CN116756674A (en) * | 2023-06-28 | 2023-09-15 | 中国地质科学院地质力学研究所 | Multi-scale anisotropic anomaly identification method, device, equipment and medium |
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| CN109425649A (en) * | 2018-10-09 | 2019-03-05 | 中国地质科学院矿产资源研究所 | Method for searching blind ore body based on element content of cow dung lithium |
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| CN116756674A (en) * | 2023-06-28 | 2023-09-15 | 中国地质科学院地质力学研究所 | Multi-scale anisotropic anomaly identification method, device, equipment and medium |
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