CN-122016671-A - Method for indicating hydrothermal center based on chlorite short-wave spectrum and Raman parameters

CN122016671ACN 122016671 ACN122016671 ACN 122016671ACN-122016671-A

Abstract

The invention discloses a method for indicating a thermal liquid center based on a chlorite short-wave spectrum and Raman parameters, which belongs to the technical field of mineral exploration and comprises the steps of carrying out geological exploration on a target mining area, determining a chlorite sample sampling point based on an exploration result, acquiring chlorite SWIR spectrum data based on a chlorite sample, analyzing and interpreting the SWIR spectrum data, establishing a mining area changed mineral spectrum matching library, analyzing spectral parameters of the chlorite sample, carrying out laser Raman spectrum scanning on the chlorite samples with different depths to obtain a change curve of Si-O br -Si telescopic vibration of the chlorite sample along with the depth, extracting SWIR and Raman parameter prospecting indexes, and establishing a comprehensive prospecting index to determine the thermal liquid center. The invention has the characteristics of high recognition degree, convenient operation, reliable result, short interpretation time, high test speed, strong short wave infrared parameter and Raman spectrum characteristic signal and high signal-to-noise ratio.

Inventors

ZHANG JIANFANG
XIAO CHANGGUI
WANG ZHEN
HU YANHUA
XIA JIASHUN
ZHANG GANGYANG

Assignees

浙江省地质院

Dates

Publication Date: 20260512
Application Date: 20260225

Claims (10)

1. A method for indicating a hydrothermal center based on chlorite short wave spectrum and raman parameters, comprising: geological survey is carried out on the target mining area, and exploration results are obtained; determining chlorite sample sampling points based on the exploration results; Acquiring chlorite SWIR spectral data based on the chlorite sample; Analyzing and interpreting the SWIR spectrum data, establishing a mining area alteration mineral spectrum matching library, and analyzing spectral parameters of a chlorite sample; Carrying out laser Raman spectrum scanning on chlorite samples with different depths, and obtaining a change curve of Si-O br -Si telescopic vibration of the chlorite samples along with the depth; extracting SWIR parameters and Raman parameters to find ore indexes, establishing SWIR parameters and Raman parameters to comprehensively find ore indexes, and further determining a hot liquid center.
2. The method for indicating a hydrothermal center based on chlorite short wave spectrum and raman parameters of claim 1, wherein performing a geological survey of a target mine to obtain survey results comprises: collecting historical exploration reports and geological graphic donation data of a target mining area; And selecting characteristic earth's outcrop for carrying out investigation observation, and recording geological occurrence, alteration and mineralization characteristics of the earth's outcrop.
3. The method of indicating a hydrothermal center based on a chlorite short wave spectrum and raman parameters of claim 2, wherein determining a chlorite sample sampling point based on the exploration results comprises: According to known ore body shapes and exploration engineering arrangements within the target mining area; selecting exploration line sections of transversal and longitudinal ore bodies; and selecting and obtaining the ground surface outcrop and the drilling hole in the section, and taking the ground surface outcrop and the drilling hole as sampling points.
4. A method of indicating a hydrothermal center based on a chlorite short wave spectrum and raman parameters of claim 3, wherein acquiring chlorite SWIR spectral data based on the chlorite sample comprises: Determining a sampling interval for the ground surface outcrop and the borehole in the selected exploration line section, and starting sampling; numbering and recording the position of the sample during sampling; connecting an infrared spectrometer, a computer and a probe, and opening data collection software to set dark current, spectrum average and reference white parameters of the infrared spectrometer according to the properties of a sample after the heat engine is started for 30 minutes; Samples were washed and air dried, each sample measured 2-3 times at different locations, and the infrared spectrometer was calibrated once after 20-30 minutes of each test.
5. The method of indicating a hydrothermal center based on chlorite short wave spectrum and raman parameters of claim 4, wherein analyzing interprets the SWIR spectral data, creates a library of mining area altered mineral spectrum matches, and analyzing spectral parameters of a chlorite sample, comprising: classifying and profiling the selected samples according to the exploration lines and the drilling holes, and establishing engineering files of each sample injection by adopting spectrum interpretation software; After the re-sampling is finished, selecting and setting a standard library built in interpretation software, selecting minerals with high probability, and shielding minerals which cannot appear under specific deposit conditions, wherein the minerals with high probability comprise mica group minerals, illite, kaolinite and chlorite, and the minerals which cannot appear comprise garnet, pyroxene and potassium feldspar; screening SWIR spectrum data to obtain target spectrum parameters; Characteristic parameters of the SWIR spectrum data are extracted, including absorption depth, absorption depth and crystallinity of a specific position.
6. The method for indicating a hydrothermal center based on chlorite short-wave spectrum and raman parameters as recited in claim 5, wherein creating the engineering file for each sample injection using spectral interpretation software comprises: unified standardization and reinjecting of spectrum parameters are carried out, sampling intervals are set in sequence, and homogenization treatment is carried out; and establishing an engineering file.
7. The method of indicating a hydrothermal center based on chlorite short wave spectrum and raman parameters of claim 6, wherein screening SWIR spectral data for target spectral parameters comprises: Interpreting SWIR spectrum data by using interpretation software, checking the interpreted SWIR spectrum data, and selecting spectral lines with low reliability, inconsistent repeated samples and low signal-to-noise ratio; And processing the spectral line by adopting a manual input or deletion method, and acquiring an error reason of the spectral line corresponding to the sample position.
8. The method for indicating a hydrothermal center based on chlorite short-wave spectrum and raman parameters of claim 7, wherein extracting characteristic parameters of SWIR spectrum data, including specific location absorption depth, and crystallinity, comprises: importing a TXT format data file of the whole drill hole or tunnel; Importing depth data of the sample; Extracting SWIR wavelength characteristic parameters of the sample based on the depth data; extracting an absorption depth characteristic parameter of a wavelength corresponding to SWIR; Constructing a crystallinity algorithm: The mica group mineral crystallinity is calculated, wherein IC is the mica group mineral crystallinity, dep2200 is the absorption depth data at 2200nm of the mica group mineral, and Dep1900 is the absorption depth data at 1900nm of the mica group mineral.
9. The method for indicating a hydrothermal center based on a chlorite short-wave spectrum and raman parameters according to claim 8, wherein performing laser raman spectrum scanning on chlorite samples of different depths and obtaining a change curve of Si-O br -Si stretching vibration of the chlorite sample with depth comprises: Scanning chlorite samples with different depths by adopting Ar + incident light sources with the wavelength of 532nm to obtain spectrograms of the characteristic raman peaks of the chlorite samples; Selecting 786cm -1 -displaced chlorite interlayer Si-O br -Si stretching vibration as a related Raman parameter; Adopting a Raman parameter related to the telescopic vibration of the chlorite Si-O br -Si, and making a Cartesian coordinate system curve of the Raman displacement of the chlorite sample with respect to the depth for the chlorite sample with each depth; The change of pressure formed by the deformation zone where the chlorite is positioned is analyzed by adopting a curve of the Raman displacement of the Si-O br -Si stretching vibration of the chlorite sample relative to the depth.
10. The method for indicating a hydrothermal center based on a chlorite short-wave spectrum and a raman parameter according to claim 1, wherein extracting SWIR parameters and raman parameter prospecting indexes, establishing SWIR parameters and raman parameter comprehensive prospecting indexes, and further determining the hydrothermal center comprises: Establishing a modification zonal standard of a magma hot-liquid deposit based on zonal characteristics of the water-containing modified minerals established by SWIR technology and green mud petrochemical zone marks established by Raman parameters; Dividing the alteration zone on the plane geological map and the exploration line section geological map according to the established alteration zoning standard to finish alteration mineral mapping; and comparing the extracted SWIR characteristic parameters, the Raman parameter values and the element content data with the positions of ore bodies on the geological map one by one to obtain the corresponding relation between the positions of the ore bodies and the chlorite parameters, determining the positions of the alteration zones where the chlorite is positioned, and extracting comprehensive mining indexes based on the SWIR technology and the Raman parameters, wherein the comprehensive mining indexes comprise the offset of the Fe-OH absorption peak position of the chlorite, the offset of the Mg-OH absorption peak position and the Si-O br -Si telescopic vibration quantity.

Description

Method for indicating hydrothermal center based on chlorite short-wave spectrum and Raman parameters Technical Field The invention relates to the technical field of mineral exploration, in particular to a method for indicating a hydrothermal center based on chlorite short-wave spectrum and Raman parameters. Background Traditional methods of prospecting are based on experience of professional geologist, or rely on petro-geochemical analysis, geophysical equipment detection, time and effort consuming. For a long time, the application of short-wave infrared Spectroscopy (SWIR) technology in mineral exploration mainly focuses on light-colored hydroxyl-containing minerals such as muscovite and sericite, wherein the short-wave infrared spectroscopy has obvious Al-OH absorption peaks near 2200 nanometers, and the crystallinity index (peak position shift and peak depth ratio, SWIR-IC) is applied to indicate the hydrothermal center. Another class of dark minerals that develop extensively but are ignored for a long time, chlorites, are difficult to resolve in SWIR signals due to their low reflectivity, complex composition and often symbiotic with other minerals. Therefore, a new technical way is needed that can accurately identify mineralization cues and has reliable results. Chlorite is a representative altered mineral that develops in the porphyry deposit, and is widely distributed in the magma hydrothermal deposit and the porphyry deposit, with development at various stages of the deposit formation process. The mineral structure and chemical components of the chlorite can sensitively reflect the temperature and pressure conditions of the ore-forming hot liquid fluid, and are shown by the characteristic parameters of short-wave infrared spectrum and laser Raman spectrum, so that the chlorite can be used as an important mineral for indicating the migration direction of the magma hot liquid (heat source), and is an important research content for identifying the center of the hot liquid in the magma hot liquid deposit prospecting process. The identification of the hydrothermal alteration zona of the deposit can be made using the short wave infrared Spectrum (SWIR) parameters and raman parameters of the chlorite group mineral. The short-wave infrared spectrum technology is a novel mineral exploration technology which is rapidly developed in the western mining industry in recent years. The common hydrothermal alteration mineral is in the short-wave infrared spectrum interval (1300-2500 nm), and the type and content of the target mineral are determined mainly according to the obvious difference of absorption characteristics of different molecular groups or the same molecular group (-OH, H 2O、NH4+、CO32-、SO42-, fe-OH and Mg-OH) of the mineral formed under different physicochemical conditions on the short-wave infrared light. Although the laser Raman technology is rapidly popularized in the mining industry in recent years, the technology is mostly applied to the Raman imaging research of fluid inclusion components, but the identification research of a magma hot-liquid ore deposit ore hot-liquid center by utilizing mineral Raman parameters is less. On the other hand, the existing identification method mainly analyzes the hot liquid center of the porphyry copper ore and magma hot liquid ore deposit according to the alteration combination of the field observation hot liquid minerals, and has the defects of complex preparation work, insufficient accuracy and low efficiency. Disclosure of Invention The invention aims to provide a method for indicating a hot liquid center based on a chlorite short-wave spectrum and Raman parameters, which is used for rapidly identifying the hot liquid center of a magma hot liquid type gold mine through the short-wave infrared spectrum and Raman parameters of the chlorite, so that the reliability of the hot liquid center of a defined mine can be effectively improved, and meanwhile, the reliability and the investigation efficiency of an investigation result can be improved through the intersection verification of the characteristics of the chlorite short-wave infrared spectrum. In order to achieve the above purpose, the present invention provides the following technical solutions: a method for indicating a hydrothermal center based on chlorite short wave spectrum and raman parameters, comprising: geological survey is carried out on the target mining area, and exploration results are obtained; determining chlorite sample sampling points based on the exploration results; Acquiring chlorite SWIR spectral data based on the chlorite sample; Analyzing and interpreting the SWIR spectrum data, establishing a mining area alteration mineral spectrum matching library, and analyzing spectral parameters of a chlorite sample; Carrying out laser Raman spectrum scanning on chlorite samples with different depths, and obtaining a change curve of Si-O br -Si telescopic vibration of the chlorite samples along with the