Patent Application
20240290437
This application claims priority to Chinese Patent Application No. 202310184807.4 with a filing date of Feb. 23, 2023. The content of the aforementioned application, including any intervening amendments thereto, is incorporated herein by reference.
The present invention belongs to the technical field of exploration, and in particular relates to a method for evaluating a metallogenic potential of a skarn deposit.
In the fragile ecological environment area of a plateau, the conventional exploration method is relatively costly and time-consuming, making it difficult to provide a clear exploration direction quickly. How to predict and evaluate a resource potential at a scale of an ore concentration area through limited exploration and evaluation techniques, guiding deposit exploration effectively, is the focus of domestic and foreign mineral exploration scientists.
Skarn deposits are mostly developed near contact zones between intermediate acidic magmatic rocks and carbonates. The occurrence and morphology of ore bodies are relatively complex, the continuity of the ore bodies is poor, the composition of minerals is complex, and the temperature range of formation is wide. During skarn formation, there is obvious zoning, with magnetite mostly formed in a late skarn stage and an oxide stage, and the formation temperature is relatively high. Skarn is developed in skarn deposits of different sizes, and how to quickly evaluate a metallogenic potential of this deposit (point) through the characteristics of skarn is a difficult point at present.
The conventional evaluation of a metallogenic potential of the skarn deposits requires to be based on large-scale geological mapping, geophysical and geochemical exploration work, and final drilling verification, and requires to complete mineral exploration stages such as general investigation and detailed investigation to evaluate the potential of the deposits, and has the following disadvantages: a long exploration and evaluation period, and a high cost, which cannot meet the urgent needs of rapid exploration and evaluation.
An object of the present invention is to provide a new method for evaluating a metallogenic potential of a skarn deposit, which organically combines mineral geochemistry and deposit potential evaluation based on the differences in major and trace elements of magnetite in the skarn deposit, and solves the technical problem of rapid exploration and evaluation of skarn deposits in a plateau area.
To achieve the above object, the technical solutions adopted are as follows:
According to the above solution, the sample collecting process in the step 2 includes recording a drill hole number and a drill hole depth, taking a field picture, and making a detailed field record at each sample collecting position; wherein the number of the samples is not less than five.
According to the above solution, selecting the most representative magnetite samples in the step 3 includes:
According to the above solution, the chemical analysis in the step 3 includes:
According to the above solution, the step 3 further includes processing the recorded data obtained from the chemical analysis by using data processing software, including:
According to the above solution, the discriminant factors F1, F2, F3, and F4 in the step 4 are obtained by a method including the following steps of:
Compared with the prior art, the beneficial effects of the present invention are as follows:
The present invention inventively proposes the use of trace elements of Ti, Ni, V and major elements of Al, K, Si and Mg in the magnetite, and inventively proposes the optimum discrimination ranges of the elements. The elements are sensitive to changes in temperature, water-rock interactions and redox conditions, and within the optimal discrimination ranges, accurate evaluation of the metallogenic potential of the skarn deposit can be made.
The following embodiments further illustrate the technical solutions of the present invention, but are not intended to limit the scope of protection of the present invention.
A specific embodiment provides a process for obtaining discriminant factors F1, F2, F3, and F4 by using skarn deposits with a known metallogenic potential:
A specific embodiment also provides a process for discriminating skarn deposits with an unknown metallogenic potential:
Magnetite samples are collected in 5 drill holes. During the sample collecting process, the following information is recorded truthfully in detail, as shown in Table 1.
The collected samples are ground into laser in-situ targets, the characteristics of magnetite corresponding to the collected samples are observed under a microscope, the mineral associations and their magnetite morphology (including an idiomorphic morphology or a veined morphology, etc.) are recorded in detail, the most representative magnetite samples are selected according to the results under the microscope, and marked with a marking pen, and in-situ micro-area elemental analysis by laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) is performed, wherein delineated areas are areas where magnetite develops, and the magnetite samples are subjected to in-situ analysis by LA-ICPMS, and the number of each analytical point is marked, and the in-situ analysis data is shown in Table 2 in ppm (10−6).
Evaluation of the metallogenic potential of the area A:
Evaluation of the metallogenic potential of the area B:
According to the calculation results of the discriminant factors F1, F2, F3 and F4, it is discriminated that the metallogenic potential of the area A is greater than that of the area B, which is consistent with the actual field investigation results, further proving the effectiveness of the new method for evaluating the metallogenic potential based on mineral chemistry of the magnetite in the skarn deposit proposed this time.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202310184807.4 | Feb 2023 | CN | national |
