Characteristic element combination anomaly derivative method of determining occurrence of deep concealed plate-shaped ore body of hydrothermal deposit

A method for predicting occurrence of a deep concealed plate-shaped ore body of a hydrothermal deposit, comprising:

• based on an ore field geomechanics theory and a method thereof, finely measuring and analyzing metallogenic structures in different levels and different veins or cross-sections in a deep tunnel of the hydrothermal deposit, and recognizing types of the metallogenic structures in a mine area to identify mineralized altered rocks distributed along the metallogenic structures and draw structural cross-section diagrams;
• collecting samples of metallogenic faulted rocks or the mineralized altered rocks at a point distance of 5-20 m, and labeling the collected samples on a geological map;
• classifying the collected samples into final samples and accessory samples, and analyzing contents of main metallogenic elements and trace elements related to mineralization of the final samples to determine whether a distribution of each element content conforms to a normal or lognormal distribution, and select elements satisfying the normal or lognormal distribution;
• based on the element content that conforms to the normal or lognormal distribution in a measured cross-section, using factor analysis and cluster analysis methods to obtain characteristic element combination indicating deep mineralization information and characteristic element combination anomaly, analyzing a variation law of the characteristic element combination anomaly, and constructing a single element distribution model based on a sampling geological point position x of different cross-section as an independent variable and a characteristic element content ci as a function to reflect the lognormal distribution of the content of an element i in a cross-section;
• c
• i
• =
• f
• ⁡
• (
• x
• )
• =
• a
• 1
• ×
• exp
• ⁡
• (
• -
• (
• (
• x
• -
• b
• 1
• ⁢
• x
• )
• /
• d
• 1
• )
• 2
• )
• wherein f(x) is the element content in unit of 10−6;
• x is a distance in unit of m;
• a1, b1 and d1 are constants;
• and i is the element;
• constructing a characteristic element combination anomaly model based on a sampling geological point position x of different cross-sections as an independent variable and a characteristic element combination anomaly Cj as a function to reflect characteristics of the lognormal distribution of the characteristic element combination anomaly Ci in a cross-section;
• C
• j
• =
• F
• ⁡
• (
• x
• )
• =
• A
• 1
• ×
• exp
• ⁡
• (
• -
• (
• (
• x
• -
• B
• 1
• ⁢
• x
• )
• /
• D
• 1
• )
• 2
• )
• wherein F(x) is the characteristic element combination anomaly, which is a non-dimensional unit;
• x is a distance in unit of m;
• A1, B1 and D1 are constants;
• j is a characteristic element combination indicating deep mineralization information;
• obtaining a first-order derivative function reflecting a dip direction of the deep concealed plate-shaped ore body by a first-order derivative of the characteristic element combination anomaly model:
• dC
• dx
• =
• F
• ′
• (
• x
• )
• =
• -
• 2
• ⁢
• (
• 1
• -
• B
• 1
• )
• 2
• ⁢
• x
• D
• 1
• 2
• ×
• A
• 1
• ×
• e
• ❘
• "\[LeftBracketingBar]"
• -
• [
• (
• 1
• -
• B
• 1
• )
• ⁢
• x
• /
• D
• 1
• )
• ]
• 2
• ❘
• "\[RightBracketingBar]"
• ;
• determining the occurrence of the deep concealed plate-shaped ore body based on the first-order derivative function, comprising:
• determining the dip direction and a dip angle of the deep concealed plate-shaped ore body;
• wherein, if F′(x)<0, it indicates that the dip direction of the concealed plate-shaped ore body is consistent with an abnormal divergence direction;
• if F′(x)>0, it indicates that the dip direction of the concealed plate-shaped ore body is opposite to the abnormal divergence direction;
• if F′(x)=(−0.01, 0.01) but ≠0, it indicates that the dip angle of the concealed plate-shaped blind ore body is steep;
• and if |F′(x)|>0.01, it indicates that the dip angle of the concealed plate-shaped ore body is gentle;
• determining strike of the deep concealed plate-shaped ore body;
• wherein if F′(x)=0 and is distributed linearly, the strike of the deep concealed plate-shaped ore body is consistent with a linear direction;
• determining a pitch direction of the deep concealed plate-shaped ore body;
• wherein an abnormal drift direction of different elevation planes indicates the pitch direction of the concealed plate-shaped ore body;
• if the characteristic element combination anomaly in a deep plane is located to a left of the characteristic element combination anomaly in a shallow plane, it indicates that the concealed plate-shaped ore body is in the pitch direction to a left;
• if the characteristic element combination anomaly in the deep plane is located to a right of the characteristic element combination anomaly in the shallow plane, it indicates that the concealed plate-shaped ore body is in the pitch direction to a right;
• if the characteristic element combination anomaly in the deep plane and the characteristic element combination anomaly in the shallow plane are in a same position on planes, it indicates that the concealed plate-shaped ore body is not in the pitch direction;
• and
• based on the determined occurrence of the deep concealed plate-shaped ore body, prospecting and exploring the deep concealed plate-shaped ore body of the hydrothermal deposit.