CN-122016901-A - Method for positioning hot liquid center of porphyry type deposit

Abstract

The invention relates to the technical field of mineral exploration, in particular to a method for positioning a hot liquid center of a porphyry type mineral deposit, which comprises the steps of firstly collecting a rock sample containing green-curtain stones in an exploration area system; secondly, analyzing Fe, al, as, sb, B, mn, pb, sr element contents of the green-curtain stone in the sample, matching and matching the data with a preset green-curtain stone geochemical fingerprint model, characterizing the law of the change of the eight element contents along with the distance from the center of the hydrothermal solution, establishing inversion based on sampling data of known ore beds, and finally determining the center position of the hydrothermal solution according to the comparison result. The multi-element quantitative model overcomes the defects of single index dependence and large error of the traditional method, and can obviously improve the positioning precision to the range of 50-120 meters, thereby accurately guiding the exploration engineering, improving the ore-finding rate and reducing the cost.

Inventors

• LANG XINGHAI
• WU WENJU
• WU WEIZHE
• WANG XUHUI
• DENG YULIN
• WU CHANGYI

Assignees

• 成都理工大学

Dates

Publication Date

20260512

Application Date

20260212

Claims (8)

1. 1. A method of locating the hydrothermal center of a porphyry deposit comprising the steps of: S1, collecting rock samples containing green-curtain stones in a target investigation region system, and recording sampling position information of each sample; S2, carrying out component analysis on the green-curtain stone in the rock sample to obtain content data of major elements Fe, al and microelements As, sb, B, mn, pb, sr; s3, matching and matching the content data of each element obtained in the step S2 with a preset green-curtain-stone geochemical fingerprint model, wherein the green-curtain-stone geochemical fingerprint model characterizes the law that the content of Fe, al, as, sb, B, mn, pb, sr elements changes along with the distance from a hydrothermal center, and the model is established based on sampling and inversion analysis of a reference deposit of a known hydrothermal center; s4, determining the position of the hot liquid center in the target exploration area according to the matching comparison result in the step S3.
2. 2. The method for locating the hot liquid center of a porphyry deposit according to claim 1, wherein the green-curtain stone geochemical fingerprint model specifically comprises an element content range of 0.7-1 apfu, 2.1-2.3 apfu, 10-40 ppm as, 1-20 ppm sb, 6-35 ppm b, 1100-3100 ppm mn, 50-90 ppm pb and 2300-2900 ppm sr in a range of 50-120 meters from the hot liquid center.
3. 3. A method of locating a hot fluid center of a porphyry deposit according to claim 1 or 2, wherein in step S2, the component analysis includes analyzing a principal element using an electron probe and analyzing a trace element using a laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS).
4. 4. The method for locating the hot liquid center of a porphyry deposit according to claim 1, wherein the step S3 is preceded by a data screening step of removing sample data with As element and Sb element content data below the detection limit of the sample.
5. 5. The method for locating the hot fluid center of a porphyry deposit according to claim 2, wherein in the step S3, the matching comparison is to determine whether the Fe and Al contents of a sample are within the range, and the contents of at least four elements in As, sb, B, mn, pb, sr are within the range.
6. 6. A method of locating a hot fluid center of a porphyry deposit according to claim 2, wherein the green-curtain geochemical fingerprint model is expressed in a box pattern with element content as a function of distance.
7. 7. The method for locating a hot fluid center of a porphyry deposit according to claim 6, wherein the element content distribution box graph comprises collecting a plurality of groups of green-curtain stone samples with different distances from the hot fluid center at the same interval distribution among the rock-type deposit centers around the known hot fluid center, analyzing content data of each element in the collected green-curtain stone samples at different distances from the hot fluid center, and then processing the content data to draw the box graph.
8. 8. The method of claim 7, wherein the data processing includes calculating an upper quartile Qmax, a lower quartile Qmin, a quartile range IQR, and an outlier for each element content.

Description

Method for positioning hot liquid center of porphyry type deposit Technical Field The invention relates to the technical field of mineral exploration, and particularly provides a method for positioning a hot liquid center of a porphyry type mineral deposit. Background Hydrothermal deposits refer to useful mineral deposits formed by packing, substitution, etc. of aqueous mineral solutions under certain physicochemical conditions in various advantageous structures and rocks. The hydrothermal deposit is the most complex and most diverse deposit type in various deposits, can be formed by different compositions and different sources of hydrothermal activities under different geological background conditions, and has important significance in the exploration of the hydrothermal deposit by defining the mineralization center of the hydrothermal deposit. The traditional method for delineating the hydrothermal center generally determines the hydrothermal center through comprehensive researches such as early large-scale alteration filling and system sampling analysis. The green curtain stone is one of characteristic minerals in a green pan lithology alteration zone in a zebra rock system due to wide distribution. In the prior art for judging the center of the hot fluid by using the elements in the green-curtain stone, common indication elements are elements such as Zn, sr, B, V, la, Y, the range defined by the elements is wide, the error is usually more than 200m, and the accurate position of the center of the hot fluid cannot be accurately judged. Although a new ore body can be found, due to low precision, the main ore body or a high-grade area is easily missed in engineering arrangement such as drilling, sampling and the like, so that resource quantity evaluation is easily affected, and the investigation cost is increased. Disclosure of Invention Aiming at the defects in the prior art, the invention provides a method for positioning the hot liquid center of a porphyry type mineral deposit based on the change of green-curtain-stone indicating elements, which organically combines mineral geochemistry and prospecting prediction, and solves the technical problems of low mineral exploration precision and long period, and the specific technical scheme is as follows: A method for locating the hot liquid center of a porphyry ore deposit includes such steps as S1, collecting the rock sample containing green-curtain stone in target investigation region, recording the information of sampling position, S2, analyzing the contents of Fe, al and trace elements As, sb, B, mn, pb, sr, S3, matching the content data of elements obtained in S2 with a predefined green-curtain stone geochemical fingerprint model, which features the variation rule of Fe, al, as, sb, B, mn, pb, sr elements content with the distance from hot liquid center, and determining the position of hot liquid center in target investigation region. In the method, the method which traditionally relies on single or few indexes to conduct rough inference is innovated into a precise positioning method based on the modeling of the known deposit 'big data'. By establishing and applying a set of specific geochemical fingerprint models aiming at Fe, al, as, sb, B, mn, pb, sr elements in the green-curtain stone, the scheme realizes quantitative and modeling identification of the hot liquid center of the porphyry type mineral deposit. The method not only fundamentally overcomes the defects of large positioning error (often more than 200 meters) and fuzzy indication range of the existing method, and obviously improves the prediction precision to a specific distance scale (such as 50-120 meters) represented by a model, so that the method can directly and accurately guide the exploration engineering arrangement, greatly improves the mineral seeing rate, reduces the exploration cost and provides revolutionary accurate guidance for the engineering arrangement. Preferably, the green-curtain-stone geochemical fingerprint model specifically comprises an element content range of 0.7-1 apfu, 2.1-2.3 apfu, 10-40 ppm of As, 1-20 ppm of Sb, 6-35 ppm of B, 1100-3100 ppm of Mn, 50-90 ppm of Pb and 2300-2900 ppm of Sr in a range of 50-120 m away from a hot liquid center. In the scheme, the found and repeatedly verified element content threshold value which is most sensitive and stable within the range of 50-120 meters from the hot liquid center is provided, the element content Fe, al, as, sb, B, mn, pb and the Sr element content in the sample green-curtain stone are collected and analyzed, the predicted position of the hot liquid center can be converged to a more accurate distance range represented by the green-curtain stone geochemical fingerprint model from an error circle of 200 meters in the traditional method by applying the green-curtain stone geochemical fingerprint model, the sampling position distribution of 50-120 m from the hot liquid center is obtained, the hot liquid center can be