CN111596373A - Method for rapidly searching concealed medium-low temperature hydrothermal type copper polymetallic ore - Google Patents
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Abstract
The invention relates to a method for quickly searching hidden low-and-medium-temperature hydrothermal type copper polymetallic ores, which collects and collates geological and mineral product data of a research area and researches ore control geological element characteristics of the low-and-medium-temperature hydrothermal type copper polymetallic ores; carrying out comprehensive measurement of regional aviation transient electromagnetism and aeromagnetism in a research area; correcting and converting the aviation transient electromagnetic original data to obtain dB/dt, and calculating a time constant; processing the original data of the aeromagnetic to obtain a vertical first-order derivative of the delta T of the aeromagnetic; screening avionic anomalies and aeromagnetic anomalies, and researching aeromagnetic and aeromagnetic anomaly characteristics of the known medium-low temperature hydrothermal type copper polymetallic deposit; and compiling an abnormal comprehensive information graph and delineating the target area of the ore. The method can quickly extract the geophysical information of the hidden medium-low temperature hydrothermal type copper polymetallic deposit, quickly define and find the target area of the deposit, has the advantages of high efficiency, low cost, no influence by topographic conditions and the like, and provides an effective technical method for mineral exploration of the hidden medium-low temperature hydrothermal type copper polymetallic deposit in China.
Description
Technical Field
The invention relates to the technical field of deep polymetallic mineral exploration, in particular to a method for quickly searching a hidden medium-low temperature hydrothermal type copper polymetallic mineral.
Background
The medium-low temperature hydrothermal type copper polymetallic ore is an ore deposit formed by magma action at the temperature of 50-300 ℃, the mineral exploration of China enters a new stage, and the surface of the ore deposit is easy to find out basically. The high-speed development of the economy of China has greater and greater demand on the copper polymetallic minerals, and the investigation of the concealed deep and large copper polymetallic minerals is in urgent need of breakthrough, thereby having important significance for guaranteeing the national resource safety. The method further explores the rapid exploration technical method of the concealed copper polymetallic mineral, and has important significance for breaking through the mineral resources in China, particularly for searching concealed deep large minerals in copper polymetallic mineral concentration areas.
Disclosure of Invention
The invention aims to provide a method for quickly searching a hidden medium-low temperature hydrothermal type copper polymetallic ore, and solves the problem that the prior art cannot quickly and effectively search the hidden medium-low temperature hydrothermal type copper polymetallic ore.
The invention is realized by the following steps: a method for rapidly searching a hidden medium-low temperature hydrothermal type copper polymetallic ore comprises the following steps:
a. and establishing a favorable copper multi-metal mining area according to the existing geological data and the medium-low temperature liquid type copper multi-metal mining data, and setting the established favorable copper multi-metal mining area as a research area.
b. And collecting geological data and mineral data of a research area, and analyzing known medium-low temperature hydrothermal type copper polymetallic deposit and ore control geological element characteristics thereof, including ore body space distribution characteristics and ore control structure distribution characteristics.
c. And arranging aviation transient electromagnetic survey lines and aeromagnetic comprehensive survey lines in a research area according to the mine control structure distribution characteristics, and simultaneously carrying out area aviation transient electromagnetic survey and aeromagnetic comprehensive survey to obtain aviation transient electromagnetic raw data and aeromagnetic raw data.
d. And correcting and converting the aviation transient electromagnetic original data to obtain dB/dt, calculating a time constant, making a dB/dt plane profile by using the dB/dt data, making a time constant contour map by using the time constant, and projecting the time constant contour map onto a geological map.
e. Processing the original aeromagnetic data to obtain aeromagnetic delta T, obtaining a vertical first derivative of the aeromagnetic delta T, making an aeromagnetic delta T plane section diagram by using the aeromagnetic delta T data, making a vertical first derivative contour diagram of the aeromagnetic delta T by using the vertical first derivative of the aeromagnetic delta T, and projecting the contour diagram onto a geological map.
f. And screening avionic anomalies by using a dB/dt plane section diagram and a time constant contour map, and screening avionic anomalies by using an aeromagnetic delta T plane section diagram and an aeromagnetic delta T vertical first derivative contour map.
g. Projecting the plane position of the known medium-low temperature hydrothermal type copper multi-metal deposit onto a dB/dt plane sectional view, a time constant contour map, an aeromagnetic delta T plane sectional view and an aeromagnetic delta T vertical first derivative contour map, and further researching the aeromagnetic and aeromagnetic abnormal characteristics of the known medium-low temperature hydrothermal type copper multi-metal deposit, including amplitude and spread characteristics;
h. and projecting the known ore body plane position to a dB/dt plane sectional view, a time constant contour map, an aeromagnetic delta T plane sectional view and an aeromagnetic delta T vertical first derivative contour map, and researching the aeromagnetic anomaly characteristics, including amplitude and spread characteristics, of the known medium-low temperature hydrothermal type copper polymetallic deposit.
i. And (3) taking the geological map as a base map, compiling an abnormal comprehensive information map according to the avionic abnormality and the aeromagnetic abnormality, and delineating a hidden low-temperature hydrothermal type copper polymetallic ore prospecting target area on the abnormal comprehensive information map according to the known avionic abnormality characteristics and aeromagnetic abnormality characteristics of the ore.
In the step c, arranging a measuring line of the aviation transient electromagnetic measurement and the aviation magnetic comprehensive measurement, wherein the direction of the measuring line is basically vertical to the direction of the ore control construction line, and the line spacing of the measuring line is 200 m.
In the step d, the correction and conversion of the aviation transient electromagnetic raw data comprise background field removal, natural electric noise removal, motion noise removal and hysteresis correction of the aviation transient electromagnetic raw data.
In step e, the processing of the aeromagnetic raw data comprises the daily change and normal field correction of the aeromagnetic raw data.
In the step f, on a dB/dt plane section diagram, judging avionic abnormality according to peak type characteristics of a single peak and a double peak of a dB/dt curve, wherein in the avionic abnormality, a maximum value coordinate of the single peak of the dB/dt curve is taken as an abnormal position, and a middle minimum value coordinate of the double peaks of the dB/dt curve is taken as an abnormal position; and (4) screening avionic anomalies according to the linear high-value anomaly zone by combining a dB/dt curve on a time constant contour map.
In the step f, on an aeromagnetic delta T plane section diagram, abnormality is screened according to delta T peak type characteristics, on an aeromagnetic delta T vertical first derivative contour diagram, a linear strip-shaped high value is screened as the abnormality, and linear weak magnetic abnormality with the amplitude of 1 nT-5 nT is focused.
And (e) in the step i, using a mapgis comprehensive processing platform, taking a geological map of the research area as a base map, and converting the avionic anomaly and aeromagnetic anomaly projections obtained in the step f onto the geological map to obtain an anomaly comprehensive information map.
The method comprises the steps of carrying out aviation transient electromagnetic measurement and aeromagnetic measurement in a copper multi-metal mining area, making a drawing, extracting aeroelectrical abnormity and aeromagnetic abnormity, determining the abnormal characteristics of the medium-low temperature hydrothermal type copper multi-metal deposit by combining known medium-low temperature hydrothermal type copper multi-metal deposit data, and delineating a hidden medium-low temperature hydrothermal type copper multi-metal deposit prospecting target area in an abnormal comprehensive information diagram according to the characteristics. The method can quickly extract the geophysical information of the hidden medium-low temperature hydrothermal type copper polymetallic deposit, quickly define and find the target area of the deposit, has the advantages of high efficiency, low cost, no influence by topographic conditions and the like, and provides an effective technical method for mineral exploration of the hidden medium-low temperature hydrothermal type copper polymetallic deposit in China.
Drawings
FIG. 1 is a flow chart of the present invention.
FIG. 2 is a dB/dt plan view and an anomaly screening diagram.
FIG. 3 is a time constant contour plot and anomaly screening schematic.
Detailed Description
As shown in fig. 1, the present invention comprises the steps of:
a. and establishing a favorable copper multi-metal mining area according to the existing geological data and the medium-low temperature liquid type copper multi-metal mining data, and setting the established favorable copper multi-metal mining area as a research area.
b. And collecting geological data and mineral data of a research area, and analyzing known medium-low temperature hydrothermal type copper polymetallic deposit and ore control geological element characteristics thereof, including ore body space distribution characteristics and ore control structure distribution characteristics.
c. And arranging aviation transient electromagnetic survey lines and aeromagnetic comprehensive survey lines in a research area according to the mine control structure distribution characteristics, and simultaneously carrying out area aviation transient electromagnetic survey and aeromagnetic comprehensive survey to obtain aviation transient electromagnetic raw data and aeromagnetic raw data.
d. And correcting and converting the aviation transient electromagnetic original data to obtain dB/dt, calculating a time constant, making a dB/dt plane profile by using the dB/dt data, making a time constant contour map by using the time constant, and projecting the time constant contour map onto a geological map.
e. Processing the original aeromagnetic data to obtain aeromagnetic delta T, obtaining a vertical first derivative of the aeromagnetic delta T, making an aeromagnetic delta T plane section diagram by using the aeromagnetic delta T data, making a vertical first derivative contour diagram of the aeromagnetic delta T by using the vertical first derivative of the aeromagnetic delta T, and projecting the contour diagram onto a geological map.
f. And screening avionic anomalies by using a dB/dt plane section diagram and a time constant contour map, and screening avionic anomalies by using an aeromagnetic delta T plane section diagram and an aeromagnetic delta T vertical first derivative contour map.
g. Projecting the plane position of the known medium-low temperature hydrothermal type copper multi-metal deposit onto a dB/dt plane sectional view, a time constant contour map, an aeromagnetic delta T plane sectional view and an aeromagnetic delta T vertical first derivative contour map, and further researching the aeromagnetic and aeromagnetic abnormal characteristics of the known medium-low temperature hydrothermal type copper multi-metal deposit, including amplitude and spread characteristics;
h. and projecting the known ore body plane position to a dB/dt plane sectional view, a time constant contour map, an aeromagnetic delta T plane sectional view and an aeromagnetic delta T vertical first derivative contour map, and researching the aeromagnetic anomaly characteristics, including amplitude and spread characteristics, of the known medium-low temperature hydrothermal type copper polymetallic deposit.
i. And (3) taking the geological map as a base map, compiling an abnormal comprehensive information map according to the avionic abnormality and the aeromagnetic abnormality, and delineating a hidden low-temperature hydrothermal type copper polymetallic ore prospecting target area on the abnormal comprehensive information map according to the known avionic abnormality characteristics and aeromagnetic abnormality characteristics of the ore.
And after the research area is determined, collecting geological and mineral information of the research area, projecting and vectorizing a geological map, projecting the coordinates of the known mineral deposit onto the geological map, and analyzing the known medium-low temperature hydrothermal type copper polymetallic mineral deposit and the mineral control geological element characteristics thereof, including the spatial distribution characteristics of mineral bodies and the structural distribution characteristics of mineral control.
And arranging survey lines for aviation transient electromagnetic measurement and aeromagnetic comprehensive measurement in a research area, wherein the survey lines are basically vertical to the direction of a mine control construction line, the distance between the survey lines is 200 m, and meanwhile, carrying out regional aviation transient electromagnetic and aeromagnetic comprehensive measurement to obtain original measurement data.
According to the original data obtained by measurement, background field removal, sky electric noise removal, motion noise removal and hysteresis correction are carried out on the aviation transient electromagnetic original data, dB/dt is calculated, and a time constant is calculated. A planar profile is created using dB/dt data, a contour plot is created using time constants, and projected onto a geological map.
And carrying out daily change and normal field correction on the original aeromagnetic data to obtain the aeromagnetic delta T and obtain the vertical first derivative of the aeromagnetic delta T. And (3) making a plane section by using the aeromagnetic delta T data, making a contour map by using the vertical first derivative of the aeromagnetic delta T, and projecting the contour map onto a geological map.
Focusing attention on a peak type of a dB/dt curve on a dB/dt plane sectional view, judging avionic abnormality according to peak type characteristics of a single peak and a double peak, taking a maximum value coordinate of the single peak of the dB/dt curve as an abnormal position in the avionic abnormality, taking a middle minimum value coordinate of the double peaks of the dB/dt curve as an abnormal position (shown in figure 2), and delineating the abnormality of continuous measuring lines as the same abnormality and numbering the abnormality; avionics anomalies (as shown in FIG. 3) were screened according to a linear high-value anomaly band on a time constant plot in conjunction with a dB/dt curve. On a aeromagnetic delta T plane section diagram, abnormality is screened according to delta T peak type characteristics, and on a aeromagnetic delta T vertical first derivative diagram, a linear strip-shaped height value is screened as abnormality; the method focuses on linear weak magnetic anomalies with the amplitude of 1 nT-5 nT, the anomalies are generally related to tectonic magma activities, a small amount of pyrrhotite substances can be formed when medium-low temperature hydrothermal type copper polymetallic ores are mined, the weak magnetic properties are achieved, and the weak magnetic anomalies are expressed as weak magnetic anomalies distributed linearly along the structure.
And projecting the known ore body plane position to a dB/dt plane sectional view, a time constant diagram contour map, an aeromagnetic delta T plane sectional view and an aeromagnetic delta T vertical first derivative contour map, and researching the aeromagnetic anomaly and aeromagnetic anomaly characteristics, including amplitude and spread characteristics, of the known medium-low temperature hydrothermal type copper polymetallic deposit to obtain an ore finding mark.
On a mapgis comprehensive processing platform, taking a geological map as a base map, converting avionics and aeromagnetic abnormal projection, and compiling an abnormal comprehensive information map; and selecting a section with strip-shaped avionic abnormality in the spreading direction of the ore control structure and superposed with 1 nT-5 nT weak magnetic abnormality according to the known characteristics of avionic and aeromagnetic abnormality of the ore by adopting a man-machine interaction mode, and delineating a copper multi-metal ore finding target area.
The method comprises the steps of carrying out aviation transient electromagnetic measurement and aeromagnetic measurement in a copper multi-metal mining area, making a drawing, extracting aeroelectrical abnormity and aeromagnetic abnormity, determining the abnormal characteristics of the medium-low temperature hydrothermal type copper multi-metal deposit by combining known medium-low temperature hydrothermal type copper multi-metal deposit data, and delineating a hidden medium-low temperature hydrothermal type copper multi-metal deposit prospecting target area in an abnormal comprehensive information diagram according to the characteristics. The method can quickly extract the geophysical information of the hidden medium-low temperature hydrothermal type copper polymetallic deposit, quickly define and find the target area of the deposit, has the advantages of high efficiency, low cost, no influence by topographic conditions and the like, and provides an effective technical method for mineral exploration of the hidden medium-low temperature hydrothermal type copper polymetallic deposit in China.
Claims (7)
1. A method for rapidly searching a hidden medium-low temperature hydrothermal type copper polymetallic ore is characterized by comprising the following steps:
a. establishing a favorable copper multi-metal mining area according to the existing geological data and medium and low temperature hydrothermal type copper multi-metal mining data, and setting the established favorable copper multi-metal mining area as a research area;
b. collecting geological data and mineral data of a research area, and analyzing known medium-low temperature hydrothermal type copper polymetallic deposit and ore control geological element characteristics thereof, including ore body space distribution characteristics and ore control structure distribution characteristics;
c. arranging aviation transient electromagnetic survey lines and aeromagnetic comprehensive measurement survey lines in a research area according to mine control structure distribution characteristics, and simultaneously carrying out area aviation transient electromagnetic measurement and aeromagnetic comprehensive measurement to obtain aviation transient electromagnetic original data and aeromagnetic original data;
d. correcting and converting the aviation transient electromagnetic original data to obtain dB/dt, calculating a time constant, making a dB/dt plane profile by using the dB/dt data, making a time constant contour map by using the time constant, and projecting the time constant contour map onto a geological map;
e. processing the original aeromagnetic data to obtain aeromagnetic delta T, and obtaining a vertical first-order derivative of the aeromagnetic delta T, making an aeromagnetic delta T plane section diagram by using the aeromagnetic delta T data, making a vertical first-order derivative contour map of the aeromagnetic delta T by using the vertical first-order derivative of the aeromagnetic delta T, and projecting the contour map onto a geological map;
f. screening avionic anomalies by using a dB/dt plane section diagram and a time constant contour map, and screening avionic anomalies by using an aeromagnetic delta T plane section diagram and an aeromagnetic delta T vertical first-order derivative contour map;
g. projecting the plane position of the known medium-low temperature hydrothermal type copper multi-metal deposit onto a dB/dt plane sectional view, a time constant contour map, an aeromagnetic delta T plane sectional view and an aeromagnetic delta T vertical first derivative contour map, and further researching the aeromagnetic and aeromagnetic abnormal characteristics of the known medium-low temperature hydrothermal type copper multi-metal deposit, including amplitude and spread characteristics;
h. projecting the known ore body plane position to a dB/dt plane sectional view, a time constant contour map, an aeromagnetic delta T plane sectional view and an aeromagnetic delta T vertical first derivative contour map, and researching the aeromagnetic anomaly characteristics, including amplitude and spread characteristics, of the known medium-low temperature hydrothermal type copper polymetallic deposit;
i. and (3) taking the geological map as a base map, compiling an abnormal comprehensive information map according to the avionic abnormality and the aeromagnetic abnormality, and delineating a hidden low-temperature hydrothermal type copper polymetallic ore prospecting target area on the abnormal comprehensive information map according to the known avionic abnormality characteristics and aeromagnetic abnormality characteristics of the ore.
2. The method as claimed in claim 1, wherein in step c, the aeronautical transient electromagnetic measurement and aeromagnetic comprehensive measurement arrangement survey line is substantially perpendicular to the direction of the ore control construction line, and the distance between survey lines is 200 m.
3. The method as claimed in claim 1, wherein the step d of performing calibration conversion on the aviation transient electromagnetic raw data comprises performing background field removal, natural electrical noise removal, motion noise removal and hysteresis correction on the aviation transient electromagnetic raw data.
4. The method as claimed in claim 1, wherein in step e, the processing of the raw aeromagnetic data includes a daily-change and normal-field correction of the raw aeromagnetic data.
5. The method for rapidly searching for the latent medium-low temperature hydrothermal type copper polymetallic ore according to claim 1, wherein in step f, on a dB/dt planar section, avionic abnormality is judged according to peak type characteristics of a single peak and a double peak of a dB/dt curve, the maximum value coordinate of the single peak of the dB/dt curve is taken as an abnormal position in the avionic abnormality, and the middle minimum value coordinate of the double peaks of the dB/dt curve is taken as an abnormal position; and (4) screening avionic anomalies according to the linear high-value anomaly zone by combining a dB/dt curve on a time constant contour map.
6. The method for rapidly searching the hidden medium-low temperature hydrothermal type copper polymetallic ore according to claim 1, characterized in that in step f, on an aeromagnetic delta T plane section diagram, abnormality is screened according to delta T peak type characteristics, on an aeromagnetic delta T vertical first derivative contour diagram, a linear strip-shaped high value is screened as abnormality, and linear weak magnetic abnormality with amplitude of 1 nT-5 nT is focused.
7. The method for rapidly searching the concealed medium-low temperature hydrothermal type copper polymetallic ore according to claim 1, wherein in the step i, a mapgis comprehensive processing platform is used, a geological map of a research area is taken as a base map, and the avionic anomaly and aeromagnetic anomaly projections obtained in the step f are converted to the geological map to obtain an anomaly comprehensive information map.
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| Publication number | Priority date | Publication date | Assignee | Title |
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