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Multielement geochemistry anomaly recognition method in complex background area of large area
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An anomaly identification and geochemical technology, applied in the fields of mineral exploration, geochemistry, and geology, can solve problems such as not considering the contribution weight of each element, and achieve the effect of improving work efficiency, positioning accuracy, and accurate focusing
Active Publication Date: 2017-12-15
INST OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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For a single geological process, element combination superposition increases the amount of information compared with single element anomalies, but because the supergene geochemical element content has the characteristics of multi-source superposition, this method only considers the total contribution of each element, and does not consider the contribution of each element. Weights
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example 1
[0090] The technical scheme of the present invention will be explained below by taking the multi-element geochemical anomaly identification using the 1:200,000 water systemsediment geochemical measurement data in the mantle plume distribution area of Mount Emei as an example.
[0091] The geochemical measurement scale of the river sediments used in this example is 1:200000, and a 2km×2km grid is used for sampling, and a total of 167178 sample points are involved in the calculation.
[0092] First, data preprocessing was performed on the geochemical measurement data of 1:200,000 water system sediments obtained from the area measurement of the study area, and the spatial coordinates of each sample point were associated with the test results. The coordinates in this example are planar Cartesian coordinates in kilometers. But the present invention is not limited thereto, and those skilled in the art can select the coordinate format according to needs.
[0093] In order to sear...
example 2
[0109] Different from Example 1, this example takes the local anomaly of elements at the sample point as the local anomaly, calculates the multi-element geochemically weighted anomaly and draws it.
[0110] As in Example 1, the median of the element content of each sample point within the neighborhood of each sample point is used as the local background value of the sample point element.
[0111] Subsequently, the element local residual anomaly LocalA of each sample point is calculated point by point n .
[0112] Local remaining exception: LocalA n =V En -LocalBK n ; n=Cu, Au, Mo, Pb, Zn, Ag; where V En is the content of element n in this sample point.
[0113] The local residual anomalies are normalized for the computed local residual anomaly calculation elements respectively. In this example, for the local residual exception LocalA n The normalization method is used for standardization, that is,
[0114] SLocalA n =(LocalA n -min n ) / (max n -min n ),
[0115] A...
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Abstract
The invention provides a geochemistry anomaly recognition method. The method comprises the steps that a main element to be analyzed of an analysis area and an element combination which comprises the main element are determined; based on space coordinates of all known sample points and contents of all elements in the element combination, multielement weighting abnormal values of all the sample points are calculated point by point; according to the space coordinates of all the sample points and the calculated multielement weighting abnormal values, a geochemistry weighting anomaly picture is drawn; the method for calculating the multielement weighting abnormal values of all the sample points comprises the steps that local background values of all the elements in first neighborhood ranges of the corresponding sample points are calculated; local abnormal values, corresponding to the local background values, of all the elements of all the sample points are calculated; local correlation coefficients, corresponding to other elements, of the main elements in the first neighborhood ranges of all the sample points are calculated. According to the geochemistry anomaly recognition method, the problem is solved that in the prior art, quick, accurate and automatic recognition of multielement geochemistry anomaly is difficultly achieved in a complex background area of a large area.
Description
technical field [0001] The invention relates to a multi-element geochemical anomaly identification method in a complex background area in a large area, and is a technology for delineating geochemical anomalies based on geochemical data. More specifically, the present invention relates to the fields of geochemistry, geology, mineral exploration, etc., and the method according to the present invention can be directly applied to the fields of mineral exploration, geological survey related to environmental geochemical evaluation, and environmental assessment. Background technique [0002] Applied geochemistry mainly studies the composition and distribution of the earth's surface materials. Mineral resources are composed of elements, and environmental problems are also determined by the distribution and behavior of chemical elements and their compounds. Therefore, applied geochemistry will solve the problems of human resources and living environment play an increasingly important...
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IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 曹殿华吕庆田
Owner INST OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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