CN107655915B - Method of discrimination based on the BIFhosted gold deposit oxidation-reduction quality of scheelite cathodoluminescence feature in Porphyry-type Deposit - Google Patents
Method of discrimination based on the BIFhosted gold deposit oxidation-reduction quality of scheelite cathodoluminescence feature in Porphyry-type Deposit Download PDFInfo
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Abstract
The present invention provides a kind of method of discrimination based on the BIFhosted gold deposit oxidation-reduction quality of scheelite cathodoluminescence feature in Porphyry-type Deposit, and steps are as follows: obtaining several scheelite samples；Mineralogy, morphology and occurrence characteristics based on scheelite particle in scheelite sample select scheelite particle, obtain high-quality white tungsten ore particle；Obtain the scanning electron microscope-cathodoluminescence image and backscatter images of high-quality white tungsten ore particle；Based on scanning electron microscope-cathodoluminescence image and backscatter images, high-quality white tungsten ore particle is divided according to the topography of scheelite particle and inner structural features, if obtaining the high-quality white tungsten ore particle of dry type；If the rare earth element in the high-quality white tungsten ore particle of pair dry type carries out in-situ study, europium content and molybdenum content data are obtained；Eu anomaly is calculated according to europium content data, establishes distribution diagram of element, the oxidation-reduction quality of BIFhosted gold deposit of the distribution diagram of element to indicate to be formed scheelite according to Eu anomaly and molybdenum content data.
Description
Technical field
The present invention relates to scheelite fluid inclusion's charcters research fields in Porphyry-type Deposit, and in particular to is based on Porphyry Type mine
The method of discrimination of the BIFhosted gold deposit oxidation-reduction quality of scheelite cathodoluminescence feature in bed.
Background technique
Porphyry Type tungsten deposit has that reserves are big, bury that shallow, grade is low, easily exploits, can the high feature of comprehensive utilization ratio.Although
From the reserves of tungsten ore and yield, Porphyry Type tungsten deposit is but continuous with geological work far away from quartz-vein type tungsten deposit
Deeply, the continuous delineation increasing the storage of old mine, such as Lianhuashan Porphyry Type tungsten deposit, and day is exerted in newfound Tibet in recent years
Skarns-Porphyry Type large size tungsten copper mine and Hunan pawpaw garden mineral deposit, so that Porphyry Type tungsten deposit has been used as the main source of tungsten ore
One of.
One of the main contents that BIFhosted gold deposit is studied as mineral deposit are the important indicators for instructing the range of reconnaissance, form mine stream
The oxidation-reduction quality of body is more important to the meaning of Porphyry-type Deposit.Therefore, the fluid inclusion natures of Porphyry Type tungsten deposit are found out,
The especially oxidation-reduction quality of fluid is the key that determining genetic type of ore deposit, finds out the regularity of ore formation.
Scheelite is generally developed in many deposit types, such as Skarn Deposit, Porphyry-type Deposit, Quartz Vein Type mineral deposit
And in some metamorphic deposits.Although at the end of the 20th century, it has been found that scheelite is also a kind of with Cathodoluminescence
Mineral, but not someone in Porphyry-type Deposit scheelite carry out cathodoluminescence correlative study.
Summary of the invention
In view of this, the present invention provides a kind of BIFhosted gold deposits based on scheelite cathodoluminescence feature in Porphyry-type Deposit
The method of discrimination of oxidation-reduction quality, the method for discrimination can utilize the oxidation of the cathodoluminescence feature decision BIFhosted gold deposit of scheelite
Reduction characteristic.
The present invention provides a kind of BIFhosted gold deposit oxidation-reduction quality based on scheelite cathodoluminescence feature in Porphyry-type Deposit
Method of discrimination, comprising the following steps:
S101 samples Porphyry-type Deposit according to field geologic characteristic of mineral deposit, obtains several scheelite samples；
S102 confirms scheelite particle in the scheelite sample using petrographic microscope by production electron probe piece
Mineralogy, morphology and occurrence characteristics, mineralogy, morphology and occurrence characteristics based on the scheelite particle are to scheelite
Particle is selected, and high-quality white tungsten ore particle is obtained；
S103 carries out cathodoluminescence photograph to the high-quality white tungsten ore particle using scanning electron microscope-cathode-luminescence spectrometer
And backscattered electron imaging, obtain scanning electron microscope-cathodoluminescence image and backscatter images；
S104 is based on the scanning electron microscope-cathodoluminescence image and backscatter images, according to the topography of scheelite particle
High-quality white tungsten ore particle is divided with inner structural features, if obtaining the high-quality white tungsten ore particle of dry type；
S105, if degrading inductivity coupled plasma mass spectrometry technology to the high-quality white of the dry type using local laser
Rare earth element in tungsten ore particle carries out in-situ study, obtains the europium content of the high-quality white tungsten ore particle, molybdenum content, samarium and contains
Amount and gadolinium concentrations data；
S106 calculates Eu anomaly according to europium content, samarium content and gadolinium concentrations data, is built according to Eu anomaly and molybdenum content data
Vertical distribution diagram of element, the oxidation-reduction quality of BIFhosted gold deposit of the distribution diagram of element to indicate to be formed scheelite.
Further, in step S101, WO in the scheelite sample that samples3Content be not less than 0.06%.
Further, in step S102, by using scheelite sample described in indoor fluorescent light irradiation to determine scheelite
The output position of scheelite particle in sample, so that it is determined that electron probe piece grinds position, the high-quality white tungsten ore particle
It is greater than 100 μm and the clean scheelite particle in surface for partial size.
Further, in step S105, if degrading inductivity coupled plasma mass spectrometry technology to described using local laser
When rare earth element in the high-quality white tungsten ore particle of dry type carries out in-situ study, external standard substance is used as using NIST 612,
Using Ca element as internal standard element.
Further, in step S106, the ordinate of the distribution diagram of element is Eu anomaly data, the distribution diagram of element
Abscissa be molybdenum content data, the format of the Eu anomaly and molybdenum content data is logarithmic format, the meter of the Eu anomaly
Calculate formula are as follows:
In formula, Eu is europium content standard value, and Sm is samarium content standard value, and Gd is gadolinium concentrations standardized value, and δ Eu is greater than
It is positive Eu anomaly when 1, is europium negative anomaly when δ Eu is less than 1.
Technical solution provided by the invention has the benefit that the oxidation-reduction quality of BIFhosted gold deposit provided by the invention
Method of discrimination is completed based on scheelite cathodoluminescence feature, to form the fluid Evolution of scheelite particle with instruction to finding out
Meaning, while can differentiate BIFhosted gold deposit oxidation-reduction quality；Method of discrimination provided by the invention, which does not direct only effectively, looks for mine side
To, and research foundation is provided to the forming process of Porphyry-type Deposit；Method of discrimination provided by the invention has straight strongly
The property seen and practical advice meaning.
Detailed description of the invention
Fig. 1 is a kind of BIFhosted gold deposit oxidation-reduction quality based on scheelite cathodoluminescence feature in Porphyry-type Deposit of the present invention
Method of discrimination flow diagram.
Fig. 2 is the distribution diagram of element obtained in one embodiment of the invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is further described.
Referring to FIG. 1, the embodiment provides one kind based on scheelite cathodoluminescence feature in Porphyry-type Deposit
BIFhosted gold deposit oxidation-reduction quality method of discrimination, comprising the following steps:
Step S101 samples Porphyry-type Deposit according to field geologic characteristic of mineral deposit, selects in Porphyry-type Deposit
WO3Content be not less than 0.06% several scheelite samples.
Step S102 is made electron probe piece, is irradiated scheelite sample repeatedly using fluorescent lamp and determine scheelite particle
Output position, and then determine that electron probe piece grinds position, then sample to obtain using petrographic microscope verification step S101
Scheelite sample in scheelite particle mineralogy, morphology and occurrence characteristics, be then based on the mineral of scheelite particle
, morphology and occurrence characteristics select scheelite particle, select partial size and are greater than 100 μm and the clean high-quality white in surface
Tungsten ore particle.
Step S103 carries out spray carbon processing to the high-quality white tungsten ore particle that step S102 is obtained, then utilizes scanning electricity
Mirror-cathode-luminescence spectrometer to spray carbon treated high-quality white tungsten ore particle carry out cathodoluminescence photograph and backscattered electron at
Picture, by adjusting, acceleration voltage, beam sizes, focal length and vacuum condition obtain scanning electron microscope-cathodoluminescence image and back dissipates
Penetrate image；In one embodiment of the invention, scanning electron microscope-cathode-luminescence spectrometer light splitting wave-length coverage is 165nm~930nm,
Probe Extensible is 160mm, and the Z value of cathodoluminescence photographic experiment condition is 13.8~14.5mm, and cathodoluminescence voltage is
800~1000V, the spot size of field emission scanning electron microscope are 5.0, voltage 10KV.
Step S104 is based on scanning electron microscope-cathodoluminescence image, utilizes backscatter images zonary structure core-side light and shade
Degree, oscillatory zones feature, embedding cloth feature, according to the topography of scheelite particle and inner structural features to high-quality white tungsten ore
Grain is divided, if obtaining the high-quality white tungsten ore particle of dry type.
Step S105, if degrading the high-quality white of inductivity coupled plasma mass spectrometry technology pair dry type using local laser
Rare earth element in tungsten ore particle carries out in-situ study, using NIST (National Institute of Standards and
Technology, national standard and technical research institute) 612 conduct external standard substances, using Ca element as internal standard element, acquisition is high
Europium content, molybdenum content, samarium content and the gadolinium concentrations data of quality scheelite particle.
Step S106 calculates Eu anomaly, the calculation formula of Eu anomaly according to europium content, samarium content and gadolinium concentrations data are as follows:
In formula, Eu is europium content standard value, and Sm is samarium content standard value, and Gd is gadolinium concentrations standardized value, and δ Eu is greater than
It is positive Eu anomaly when 1, is europium negative anomaly when δ Eu is less than 1；
Using Eu anomaly data as ordinate, using molybdenum content data as abscissa, distribution diagram of element is established, distribution diagram of element is used
To indicate to be formed the oxidation-reduction quality of the BIFhosted gold deposit of scheelite；Eu anomaly and the format of molybdenum content data are logarithmic format.
It is the distribution diagram of element in the embodiment obtained using method of discrimination provided by the invention, Fig. 2 with reference to Fig. 2
In, triangle, diamond shape and circular pattern respectively indicate the scheelite particle collected from the first drilling, from triangle to circle
Shape pattern, first drilling from shallow to deep, illustrate first drill hydrothermal fluid from shallow to deep, reproducibility gradually increases；Ten in Fig. 2
Herringbone pattern indicates the scheelite particle collected from the second drilling, and the position of the second drilling is located at the southeast of the first drilling
Side, the inclined reproducibility of hydrothermal fluid of the second drilling；Fork-shaped pattern indicates the scheelite collected from third drilling in Fig. 2
Grain, the position of third drilling are located at the northwest side of the first drilling, the hydrothermal fluid partial neutral of third drilling, from Fig. 2 comprehensive analysis
Judgement forms the minor ore body fluid of scheelite from shallow to deep, and the reproducibility of fluid gradually increases；By the southeast to northwest, fluid
Oxidisability gradually increases.
The oxidation-reduction quality method of discrimination of BIFhosted gold deposit provided by the invention is completed based on scheelite cathodoluminescence feature
, the fluid Evolution of scheelite particle is formed with indicative significance to finding out, while can differentiate BIFhosted gold deposit oxidation-reduction quality；This
The method of discrimination that invention provides does not direct the range of reconnaissance only effectively, and provides and grind to the forming process of Porphyry-type Deposit
Study carefully foundation；Method of discrimination provided by the invention has intuitive and practical advice meaning strongly.
In the absence of conflict, the feature in embodiment and embodiment herein-above set forth can be combined with each other.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of method of discrimination based on the BIFhosted gold deposit oxidation-reduction quality of scheelite cathodoluminescence feature in Porphyry-type Deposit,
It is characterized in that, comprising the following steps:
S101 samples Porphyry-type Deposit according to field geologic characteristic of mineral deposit, selects WO in Porphyry-type Deposit3Content
Several scheelite samples not less than 0.06%；
S102 confirms the mineral of scheelite particle in the scheelite sample by production electron probe piece using petrographic microscope
, morphology and occurrence characteristics, mineralogy, morphology and occurrence characteristics based on the scheelite particle are to scheelite particle
It is selected, selects partial size and be greater than 100 μm and the clean high-quality white tungsten ore particle in surface；
S103 is carried out spray carbon processing to the high-quality white tungsten ore particle that step S102 is obtained, is composed using scanning electron microscope-cathode-luminescence
Instrument carries out cathodoluminescence photograph to the high-quality white tungsten ore particle and backscattered electron is imaged, and obtains scanning electron microscope-cathode
Luminescent image and backscatter images；
S104 is based on the scanning electron microscope-cathodoluminescence image, utilizes backscatter images zonary structure core-side shading value, vibration
Swing annulus feature, embedding cloth feature, according to the topography of scheelite particle and inner structural features to high-quality white tungsten ore particle into
Row divides, if obtaining the high-quality white tungsten ore particle of dry type；
S105, if degrading inductivity coupled plasma mass spectrometry technology to the high-quality white tungsten ore of the dry type using local laser
Rare earth element in particle carries out in-situ study, obtain the europium content of the high-quality white tungsten ore particle, molybdenum content, samarium content and
Gadolinium concentrations data；
S106, calculates Eu anomaly according to europium content, samarium content and gadolinium concentrations data, establishes member according to Eu anomaly and molybdenum content data
Plain distribution map, the oxidation-reduction quality of BIFhosted gold deposit of the distribution diagram of element to indicate to be formed scheelite.
2. the BIFhosted gold deposit oxidation-reduction quality as described in claim 1 based on scheelite cathodoluminescence feature in Porphyry-type Deposit
Method of discrimination, which is characterized in that it is white with determination by using scheelite sample described in indoor fluorescent light irradiation in step S102
The output position of scheelite particle in tungsten ore sample, so that it is determined that electron probe piece grinds position.
3. the BIFhosted gold deposit oxidation-reduction quality as described in claim 1 based on scheelite cathodoluminescence feature in Porphyry-type Deposit
Method of discrimination, which is characterized in that in step S105, inductivity coupled plasma mass spectrometry technology is degraded to institute using local laser
If state the rare earth element progress in-situ study in the high-quality white tungsten ore particle of dry type, external standard is used as using NIST 612
Matter, using Ca element as internal standard element.
4. the BIFhosted gold deposit oxidation-reduction quality as described in claim 1 based on scheelite cathodoluminescence feature in Porphyry-type Deposit
Method of discrimination, which is characterized in that in step S106, the ordinate of the distribution diagram of element is Eu anomaly data, the element
The abscissa of distribution map is molybdenum content data, and the format of the Eu anomaly and molybdenum content data is logarithmic format, and the europium is different
Normal calculation formula are as follows:
In formula, Eu is europium content standard value, and Sm is samarium content standard value, and Gd is gadolinium concentrations standardized value, when δ Eu is greater than 1
It is europium negative anomaly when δ Eu is less than 1 for positive Eu anomaly.
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| CN111272797B (en) * | 2020-03-09 | 2021-06-25 | 中南大学 | Mineral exploration method for judging mineralization of granite body by using zircon |
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Non-Patent Citations (3)
| Title |
|---|
| Qian"echong low-F porphyry Mo deposits in the Dabie Mountains, central China;Mei Mi et.al;《Lithos》;20151231(第239期);第157-169页 |
| Rare earth elements (REE)—Minerals in the Silius fluorite vein system(Sardinia, Italy);N. Mondillo et.al;《Ore Geology Reviews》;20151212(第74期);全文 |
| Scheelite elemental and isotopic signatures: Implications for the genesis of skarn-type W-Mo deposits in the Chizhou Area, Anhui Province, Eastern China;Guoxue SonG et.al;《American Mineralogist》;20141231;第99卷;第303-317页 |
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