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Scheelite mineralogy prospecting method for accurately judging tungsten polymetallic deposit type and denudation depth

A scheelite and polymetallic technology, applied in the field of ore prospecting and exploration, can solve problems such as inability to obtain deposit information, labor and capital consumption, multi-solution surface pollution interference, etc., to eliminate external interference and multi-solution, eliminate interference effect

Active Publication Date: 2022-07-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method delineates the level and scope of geochemical anomalies through the analysis of elemental content related to mineralization, and then conducts drilling verification, but this method consumes a lot of manpower and money, and cannot obtain direct deposit information, such as the type of deposit , buried depth, etc. In addition, the multi-solution nature of the chemical prospecting method itself and the interference of surface pollution make the prospecting and exploration effect of the geochemical prospecting method lower.

Method used

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  • Scheelite mineralogy prospecting method for accurately judging tungsten polymetallic deposit type and denudation depth
  • Scheelite mineralogy prospecting method for accurately judging tungsten polymetallic deposit type and denudation depth
  • Scheelite mineralogy prospecting method for accurately judging tungsten polymetallic deposit type and denudation depth

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Experimental program
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Effect test

Embodiment 1

[0027] S2: The scheelite was embedded in epoxy resin, polished, and polished using a Tescan MIRA 3 field emission scanning electron microscope (SEM) (equipped with a Delmic sparc cathodofluorescence probe. The operating voltage was 0.5-30 kV, and the filament emission current was 72 μA. Spectral analysis test conditions Accelerating voltage is generally 20-30KV, working distance 9.5-10.5mm) to take pictures to obtain CL images of scheelite (such as figure 1 ). The content of trace elements in different regions of the same particle leads to significant differences in its cathodoluminescence characteristics, and the microstructure revealed by cathodoluminescence (CL) can reveal the growth history of minerals and reflect the crystallization environment ( figure 1 ). Summarizing previous studies, CL images of scheelite in different types of tungsten deposits show different characteristics: CL images of scheelite in skarn-type deposits generally develop obvious fan-shaped partitio...

Embodiment 2

[0029]Step S2 is the same as in Example 2, and S3 is specifically described here: According to the CL image characteristics of scheelite, use Geolaspro 193nm laser ablation system for different CL partitions to measure the content of trace elements in different partitions of scheelite particles (laser beam spot and frequency 35 μm and 10 Hz respectively), the offline processing of the analytical data (including the selection of samples and blank signals, instrument sensitivity drift correction and element content calculation) was performed by the software ICPMSDataCal software to obtain the content of various trace elements in different areas of the scheelite. The rare earth distribution pattern of scheelite has important reference significance for judging the type and characteristics of scheelite. At different distances from the rock mass, the rare earth distribution pattern of scheelite has obvious differences, (such as figure 2 ), through the difference of rare earth distri...

Embodiment 3

[0031] Steps S2-S3 are the same as those of Embodiment 2, and S4 is specifically described here:

[0032] S4: O isotope analysis of scheelite using solution method oxygen isotope analysis on Thermo-FinniganDeltaPlus XP Isotope-Ratio Mass Spectrometer (IRMS) instrument, H in inclusions 2 O and BrF 5 React at a constant temperature of 300 °C for 20 min to generate O purified by freezing 2 . Oxygen reacts with graphite to form CO at 700 °C under Pb catalyst conditions 2 , and the oxygen isotope composition was analyzed by MAT253 gas isotope mass spectrometer. The measurement results are based on SMOW, recorded as δ18OV-SMOW, and the analytical accuracy is better than ±0.2‰. The oxygen isotope reference standard is GBW-04409 and GBW-04410 quartz standard, δ18OH 2 The O values ​​were 11.11±0.06‰ and -1.75±0.08‰, respectively. isolated pure O 2 , and by O 2 Reacts with carbon rods to produce CO 2 gas. CO collected 2 Gas was tested by mass spectrometry. The accuracy of a ...

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Abstract

The invention provides a scheelite mineralogy prospecting method for accurately judging tungsten polymetallic deposit types and denudation depths, which comprises the following steps: collecting scheelite samples from different types of tungsten deposits, and sorting out scheelite single particles from the samples; embedding scheelite in epoxy resin, polishing, and shooting a CL image cathode fluorescence image; carrying out LA-ICP-MS microelement analysis on different CL partitions, and carrying out solution method oxygen isotope analysis on scheelite; the method comprises the following steps: comparing a CL image and trace element characteristics of scheelite with a database, extracting information such as an ore deposit type and denudation depth, integrating mineral geochemical characteristics of the scheelite, and establishing a scheelite type-ore deposit type-denudation depth comprehensive prospecting model; the method has the advantages that mineralogy information is directly obtained, and external interference and multiplicity of solutions of elemental analysis are eliminated.

Description

technical field [0001] The invention relates to the technical field of ore deposit prospecting and exploration, in particular to a scheelite mineralogical prospecting method for accurately discriminating the type and erosion depth of a tungsten polymetallic ore deposit. Background technique [0002] At present, the first geochemical exploration method used in prospecting and exploration of ore deposits is carried out by means of rock geochemical measurement, soil (detritus, ditch, hydrochemical, deep-penetrating geogas, etc.) geochemical measurement and river sediment measurement. This method delineates the level and scope of geochemical anomalies through metallogenic-related element content analysis, and then conducts drilling verification, but this method requires a lot of manpower and funds, and cannot obtain direct deposit information, such as deposit type. , burial depth, etc. In addition, the geochemical exploration method itself also has multiple solutions and the int...

Claims

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Application Information

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IPC IPC(8): G01N33/24G01N27/626G01N21/64G01N23/2251
CPCG01N33/24G01N27/626G01N21/64G01N23/2251
Inventor 吴堑虹刘飚谭富诚
Owner CENT SOUTH UNIV
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