US 12,255,058 B2
Method for determining direction and distance of metallogenic pluton of skarn deposit with garnet
Youye Zheng, Wuhan (CN); Xin Chen, Wuhan (CN); Xiaojia Jiang, Wuhan (CN); Feng Gao, Lhasa (CN); Shucun Wang, Lhasa (CN); Jiangang Wei, Lhasa (CN); Defu Shu, Lhasa (CN); Daohu Lin, Lhasa (CN); Zhuoga Suolang, Lhasa (CN); and Jingjing Li, Lhasa (CN)
Assigned to TIBET JULONG COPPER CO., LTD., Lhasa (CN); and CHINA UNIVERSITY OF GEOSCIENCES (WUHAN), Wuhan (CN)
Filed by TIBET JULONG COPPER CO., LTD., Lhasa (CN); and CHINA UNIVERSITY OF GEOSCIENCES (WUHAN), Wuhan (CN)
Filed on Jun. 20, 2023, as Appl. No. 18/338,339.
Claims priority of application No. 202310181481.X (CN), filed on Feb. 20, 2023.
Prior Publication US 2024/0282565 A1, Aug. 22, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H01J 49/10 (2006.01); G01N 1/28 (2006.01); G01N 33/00 (2006.01); H01J 49/04 (2006.01)
CPC H01J 49/105 (2013.01) [G01N 1/286 (2013.01); G01N 33/389 (2024.05); H01J 49/0463 (2013.01); G01N 2001/2866 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method for determining a direction and a distance of a metallogenic pluton of a skarn deposit with a garnet, comprising:
(1) collecting a sample:
collecting a representative garnet sample from the skarn;
(2) performing petrographic observation on the sample and designing an experimental area:
grinding a collected sample into a probe piece, and determining and marking a single mineral crystal area of the garnet;
(3) computing a parameter:
obtaining a trace element content of a marked area through laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) in-situ microanalysis, and computing a ratio (L/H) of a light rare earth content to a heavy rare earth content;
(4) building a model:
substituting the obtained ratio (L/H) of the light rare earth content to the heavy rare earth content into exponential models D=a′(L/H) b and D=a′(L/H) b+c and a logarithmic model D=a′(ln(L/H)+4) (b+0.1);
(5) setting a parameter range:
setting a parameter a′∈[−1000,1000] with a step size of 50, and setting a parameter b∈[−10,10] with a step size of 0.5 in the exponential model D=a′(L/H) b;
setting a parameter a′∈[−1000,1000] with a step size of 50, setting a parameter b∈[−10,10] with a step size of 0.5, and setting a parameter c∈[−1000,1000] with a step size of 50 in the exponential model D=a′(L/H) b+c; and
setting a parameter a′∈[−1000,1000] with a step size of 50, and setting a parameter b∈[−10,10] with a step size of 0.5 in the logarithmic model D=a′(ln(L/H)+4) (b+0.1);
(6) optimizing parameters of the model:
optimizing the parameters of the three models through a grid search method, and determining optimized parameters a′, b and c of the three models respectively through repeated circulative iteration and by taking a minimum R as a limit condition;
wherein R represents an optimized buffer radius:

OG Complex Work Unit Math
 and has a threshold ≤60 m; and
n represents the samples number, i represents a sampling point i, Di represents a linear distance in m between an optimal location of the metallogenic pluton and the sampling point i, ri represents a linear distance in m between a location of the metallogenic pluton obtained from an optimal parameter model for the sampling point i and the sampling point i, and D′ represents an absolute value in m of a difference between Di and ri; and
(7) locating and delineating the metallogenic pluton:
taking a model with a minimum R among the three models as an optimal model, substituting data of all sampling points into the optimal model, computing D of each sampling point, drawing a circle with a corresponding sampling point as a center and D as the radius, determining an intersection point of all circles as coordinates (X, Y) of the metallogenic pluton, and performing delineation with R as a buffer area of the metallogenic pluton.