CN116359254A - Ore finding method based on magnesium high-iron angle amphibole pointer mineral - Google Patents

Ore finding method based on magnesium high-iron angle amphibole pointer mineral Download PDF

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CN116359254A
CN116359254A CN202310163595.1A CN202310163595A CN116359254A CN 116359254 A CN116359254 A CN 116359254A CN 202310163595 A CN202310163595 A CN 202310163595A CN 116359254 A CN116359254 A CN 116359254A
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amphibole
rock mass
rock
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章永梅
顾雪祥
李婷
范光
张英帅
董树义
彭义伟
王滔
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China University of Geosciences Beijing
Beijing Research Institute of Uranium Geology
Chengdu Univeristy of Technology
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    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
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    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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Abstract

The invention discloses a mineral prospecting method based on a magnesium high-iron angle amphibole pointer mineral, which comprises the following steps: (1) Collecting a representative rock sample containing amphibole minerals according to the exposure condition of the medium-acid rock mass in the to-be-explored area; (2) Grinding the rock sample into a probe sheet, and analyzing the obtained main component of the amphibole by an electronic probe; (3) According to the main component of the amphibole, determining the mineral type of the amphibole, counting the duty ratio of each type of amphibole containing magnesium Gao Tiejiao amphibole, calculating the oxygen loss degree and the Mg/(Mg+Fe) atomic ratio Mg# value of the amphibole, drawing a series of diagrams of the type duty ratio, the oxygen loss degree and the Mg# value of the amphibole on an acid rock mass distribution diagram in a to-be-explored area, and circling a favorable ore-forming remote scenic spot. The invention not only improves the prospecting efficiency and success rate, but also greatly reduces the prospecting cost, and has important significance for searching the hot liquid type Fe-Cu-Mo-Au ore deposit of the porphyry-silkaite and magma.

Description

Ore finding method based on magnesium high-iron angle amphibole pointer mineral
Technical Field
The invention belongs to the field of mineral exploration and evaluation, and particularly relates to a mineral prospecting method based on magnesium high-iron angle flash pointer minerals, which relates to a method for distinguishing the minerality of acidic rock in a porphyry-silkaite and magma hydrothermal system by utilizing the chemical components of angle flash, in particular the duty ratio, oxygen loss and Mg# index of new mineral magnesium high-iron angle flash, so as to distinguish mineral and non-mineral rock.
Background
The mineral geochemistry method is a more direct means of understanding the properties of the rock magma and is therefore commonly used to evaluate the mineralisation of medium acid rock masses. The minerals for evaluating the mineralization of the medium-acid rock mainly comprise zircon, apatite, sphene and the like. The Ce positive abnormality and Eu negative abnormality in zircon microelements are used as effective parameters for judging the oxidability and minedability of the magma, REE, sr, S, mn, th, U and other elements in apatite have an indication effect on the mineralogy of the magma, and Sn, W and Mo in sphene can reflect the mineralogy of the magma. However, these minerals are accessory minerals in the rock or ore body at very low levels (sometimes, levels of less than 2%). The particles of the minerals are tiny, and the identification is difficult, and the minerals can be identified by means of a polarizing microscope, a scanning electron microscope, cathodoluminescence and other instruments. The mineral separation and test cost is high, the mineral is required to be sent to a related mechanism to obtain a sample by using a reselection method and the like, and the trace element components are required to be measured by using large-scale instruments such as a laser ablation plasma mass spectrometer after the sample is obtained. The diagram for discriminating the mineral content based on the trace components obtained from these minerals is complicated and difficult to use. These factors limit the use of mineral pointers such as zircon, apatite, sphene, etc.
Disclosure of Invention
The invention provides a method for finding ores based on magnesium high-iron angle amphibole pointer minerals, which is used for determining angle amphibole components of different medium-acid rock masses in an area to be explored and determining angle amphibole types, duty ratios, oxygen loss and Mg# values so as to evaluate the minerality of the rock masses.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a mineral prospecting method based on magnesium high-iron angle amphibole pointer minerals comprises the following steps:
(1) Collecting a representative rock sample containing amphibole minerals according to the exposure condition of the medium-acid rock mass in the to-be-explored area;
(2) Grinding the rock sample into a probe sheet, and analyzing the obtained main component of the amphibole by an electronic probe;
(3) According to the main component of the amphibole, determining the mineral type of the amphibole, counting the sample number proportion of each type of amphibole containing magnesium Gao Tiejiao amphibole, calculating the oxygen loss degree and the Mg/(Mg+Fe) atomic ratio Mg# value of all the amphiboles, and drawing a series of diagrams of the type proportion, the oxygen loss degree and the Mg# value of the amphibole on an acid rock mass distribution diagram in a to-be-explored area to define a favorable ore-forming remote scenic spot.
Further, the method for evaluating the minerality of the acidic rock mass in the step (3) comprises the following steps:
condition one: judging the rock mass as suspected ore-forming rock mass when the ratio of the magnesium high-iron angle amphibole is more than or equal to 2/3; when the ratio of the magnesium high-iron amphibole to the rock is less than 1/3 and the amphibole and/or the glauconite type appears, judging that the rock mass is suspected not to be formed;
condition II: when the oxygen loss degree average value is more than or equal to delta NNO+1, judging that the rock mass is suspected to be the ore-forming rock mass; when the oxygen loss degree average value is smaller than delta NNO+1, judging that the rock mass is suspected not to be formed;
and (3) a third condition: when the average Mg# value is more than or equal to 0.5, judging that the rock mass is suspected to be the ore-forming rock mass; when the average value of the Mg# is less than 0.5, judging that the rock mass is suspected to be non-mineargenic;
judging the rock mass to be formed when the suspected rock mass to be formed in the first to third conditions are satisfied; and judging the rock mass not to be formed when any one or more conditions of the suspected rock mass not to be formed in the conditions one to three are met.
Furthermore, in the step (1), 3-5 representative samples are collected for each rock mass, and the rock mass can be increased to 6-10 rock mass when the lithology is complex; the rock sample is greater than 5cm.
Further, the main component of the amphibole in the step (2) comprises SiO 2 、TiO 2 、Al 2 O 3 、FeO、MnO、MgO、CaO、Na 2 O、K 2 O, F and Cl.
Further, the main component of the amphibole in the step (3) calculates the type of amphibole according to Hawthorne et al (2012) division scheme.
Further, the formula for the calculation of the amphibole oxygen loss is described by Ridolfi et al (2010):
ΔNNO＝1.644Mg*-4.01，
wherein,,
Mg*＝Mg+Si/47-[6]Al/9-1.3 [6] Ti+Fe 3+ /3.7+Fe 2+ /5.2 -B Ca/20- A Na/2.8+ A []/9.5。
further, the mineral types of the amphiboles relate to magnesium high iron amphiboles, magnesium green calcium amphiboles, ti-containing magnesium green calcium amphiboles, actinolite, leek amphiboles, magnesium amphiboles, iron amphiboles, green calcium amphiboles, potassium green calcium amphiboles.
Furthermore, the ore in the ore-forming remote scenic spot is a porphyry-skarn or magma hydrothermal type Fe-Cu-Mo-Au ore deposit.
The beneficial effects of the invention are as follows:
the invention provides a mineral prospecting method based on a magnesium high-iron angle amphibole pointer mineral, belongs to the technical field of mineral resource exploration, and solves the problems of low content of auxiliary minerals, high sorting and testing costs and complex discrimination and graphic use in the existing mineral prospecting method. The sample dosage is small and the sample is not damaged, so that the further development of other researches is facilitated. According to the invention, a magnesium high-iron angle amphibole related chart is compiled according to a plurality of index parameters including angle amphibole components, the duty ratio, oxygen loss (delta NNO) and Mg# value in acid rock mass in different positions in a region to be explored, and rock mass with good minerality is rapidly defined. The amphibole sample is easy to obtain in the field, can be roughly distinguished by naked eyes, the cost and difficulty for manufacturing the probe sheet and analyzing the electronic probe are far lower than those of single mineral sorting and laser plasma mass spectrometry, and the amphibole mineral cannot be lost due to single mineral sorting and laser ablation. The invention not only improves the prospecting efficiency and success rate, but also greatly reduces the prospecting cost, and has important significance for searching the hot liquid type Fe-Cu-Mo-Au ore deposit of the porphyry-silkaite and magma.
Drawings
FIG. 1 is a diagram of acid rock sampling locations in the Borocaceae region of SiTianshan mountain of Xinjiang;
FIG. 2 is a statistical plot of the different amphibole types in the ore-forming rock mass (a) and the non-ore-forming rock mass (b);
FIG. 3 is a graph showing differences in different angular amphibole crystallization conditions in a mineral-forming rock mass (red) and a non-mineral-forming rock mass (blue);
FIG. 4 is a plot of different gonite Mg# values and oxygen fugacity in a mineralised (red) and non-mineralised (blue) body.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
A method for searching for new minerals based on magnesium high-iron angle amphibole comprises the following steps: taking a typical rock mass of a region of Borocaceae, tianshan, sichuan, as an example, the method specifically comprises the following steps:
(1) Identifying that the Hurster heterorock body comprises two long granite, granite amphibole, amphibole and dark-colored particle inclusion through field geological investigation and borehole cataloging; the lithology of the large-tile Brookfield rock is granite of granite amphibole and two-long granite; the lithology of the Lai Li Sigao is inclined long granite porphyry; the rock lithology of the Nepegleg is two-length granite and granite amphibole.
(2) In the above rock mass surface and borehole, representative rock samples (3-7) containing amphibole minerals were collected for each rock mass, the sample size was 6-10cm, and the information of the samples was recorded in detail as shown in table 1:
Figure BDA0004095071310000041
Figure BDA0004095071310000051
(3) Sample preparation: grinding rock samples collected in the field into probe sheets (length multiplied by width is 25mm multiplied by 50mm, thickness is 0.03-0.1 mm), selecting fresh amphibole particles under a polarizing microscope, and circling;
(4) Sample testing: after the probe sheet was carbon-sprayed, the major component (SiO) of the boulder particles circled was measured using an electron probe analyzer 2 、TiO 2 、Al 2 O 3 、FeO、MnO、MgO、CaO、Na 2 O、K 2 O、F、Cl)；
(5) And (3) data processing: the measured data were imported into a Li et al (2020) Excel calculation table, and the type of amphibole was determined according to Hawthorne et al (2012) classification scheme (table 2, table 3).
(6) Mineral formation evaluation of medium acid rock mass: different types of amphibole duty cycle, oxygen loss and Mg value parameters (table 2, table 3) including Mg high iron amphibole were counted and the mineralisation of the sour rock mass in the evaluation. According to the three judging steps, the magnesium high-iron angle amphibole in the Hurster rock mass is 82 percent, the magnesium green calcium amphibole is 18 percent, and the new mineral magnesium high-iron angle amphibole accounts for more than 2/3; Δnno average = 1.13, greater than Δnno+1; mg# average 0.61, greater than 0.5; thus, the rock mass is comprehensively judged to be the actual rock mass of the Ai Musi Lei-Ke-Sara iron copper deposit, which accords with the actual geological condition. The magnesium high-iron angle amphiblestone in the large-tile rock mass has the average value of delta NNO=1.1 and the average value of Mg# of 0.58, and is the actual ore-forming rock mass of the kohler iron-carrying copper ore; the rock mass of the Lai Li Sigao L is the actual ore-forming rock mass of the Lai Li Sigao L molybdenum ore, wherein 89 percent of the magnesium high-iron angle amphibole, 11 percent of the magnesium angle amphibole, the average value of delta NNO=1.25 and the average value of Mg# of 0.6. The Napegleg rock mass is determined to be a non-mineral rock mass, and is consistent with the actual geological conditions, wherein the Napegleg rock mass is 25% of magnesium high-iron angle amphibleb, the iron angle amphibleb is 75%, the average value of delta NNO is=0.11, and the average value of Mg# is 0.44. The effectiveness of the method for searching the mineral based on the magnesium high-iron angle amphibole pointer is further proved by a plurality of rock mass discrimination examples in the area of Borocaceae in the western Tianshan of Xinjiang.
TABLE 2 electronic probe part data and related parameters for rock mass angle amphibole in the area of bernoulli in Sichuan mountain, xinjiang
Figure BDA0004095071310000061
Figure BDA0004095071310000071
Example 2
A method for searching for new minerals based on magnesium high-iron angle amphibole comprises the following steps: taking a Shandong exquisite rock body as an example, the method specifically comprises the following steps:
(1) Collecting a representative rock sample containing amphibole minerals according to the exposure condition of the medium-acid rock mass in the to-be-explored area;
(2) Grinding the rock sample into a probe sheet, and analyzing the obtained main component of the amphibole by an electronic probe;
(3) The amphibole major component was introduced into a Li et al (2020) Excel calculation table, and the amphibole type was determined according to Hawthorne et al (2012) classification scheme (table 4).
(4) Mineral formation evaluation of medium acid rock mass: different types of amphibole duty cycle, oxygen loss and Mg value parameters including Mg high iron amphibole (table 4) were counted and the mineralisation of the sour rock mass in the evaluation. 92.3% of Shandong exquisite rock mass green calcium amphibole and 1.7% of potassium green calcium amphibole, and does not contain magnesium high-iron angle amphibole; the calciferous and potash calciferous species are not amenable to Ridolfi et al (2010) oxygen loss calculation formulas; and the average value of Mg# is 0.33 and less than 0.5, and the aggregate judgment is that the rock mass is not formed, so that the aggregate judgment accords with the actual geological condition.
Figure BDA0004095071310000091
FIG. 2 is a statistical plot of the different amphibole types in the ore-forming rock mass (a) and the non-ore-forming rock mass (b); the ore-forming rock body (a) mainly comprises a magnesium high iron ore amphibole and a magnesium green calcium amphibole, wherein the proportion of the magnesium high iron ore amphibole is more than 2/3; the non-mineralised rock mass (b) is characterised by a glauconite and an iron Gao Tiejiao amphibole, the majorite being less than 1/3.
FIG. 3 is a graph showing differences in different angular amphibole crystallization conditions in a mineral-forming rock mass (red) and a non-mineral-forming rock mass (blue); the magnesium high iron angle amphiboles (red) in the ore-forming rock mass formed in the high oxygen fugacity condition (average greater than Δnno+1) and the magnesium high iron angle amphiboles (blue) in the non-forming rock mass formed in the low oxygen fugacity condition (average less than Δnno+1).
FIG. 4 is a plot of different gonite Mg# values and oxygen fugacity in a mineralised (red) and non-mineralised (blue) mass; the mineralisation of rock mass can be assessed using the mg# value-oxygen loss (Δnno) plot in the figure, with the mineralised rock mass amphibole falling to the upper right and the non-mineralised rock mass falling to the lower left.
The ore-forming rock mass in fig. 2-4 is obtained according to 251 corner flash data statistics of the ore-forming rock mass of the Xinjiang, yunnan, shandong and Tibet 16 zebra-sikaka and magma hot liquid type gold ore beds in China (three-fork zebra type Cu ore, hikudo zebra type Cu-Mo ore, red lake-Fuxing zebra type Cu ore, dam Sibra zebra type Cu ore, maackia type Cu-Mo ore, kershal Sikava type Fe-Cu ore, harle, sikava type Fe-Cu ore, lei Li Sigao mole type Mo ore, watershed zebra type Cu-Mo, laba zebra type Cu-Mo, colloidal east magma hot liquid type Au ore, three-Buddha magma hot liquid type Au ore, cinnological zebra type Cu ore, multiple-magma hot liquid type Cu-Au ore and Pr type Cu-Au ore); the non-mineralised rock mass is obtained according to the statistics of 70 corner amphiboles of 8 non-mineralised rock masses in Xinjiang, yunnan and Shandong of China (Su Yunhe, white lotus village, gulf, south large plateau, yao An, liuhe, nepegleg and exquisite rock mass).
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. The method for searching the ore based on the magnesium high-iron angle amphibole pointer mineral is characterized by comprising the following steps of:
(1) Collecting a representative rock sample containing amphibole minerals according to the exposure condition of the medium-acid rock mass in the to-be-explored area;
(2) Grinding the rock sample into a probe sheet, and analyzing the obtained main component of the amphibole by an electronic probe;
(3) According to the main component of the amphibole, determining the mineral type of the amphibole, counting the sample number proportion of each type of amphibole containing magnesium Gao Tiejiao amphibole, calculating the oxygen loss degree and the Mg/(Mg+Fe) atomic ratio Mg# value of all the amphiboles, and drawing a series of diagrams of the type proportion, the oxygen loss degree and the Mg# value of the amphibole on an acid rock mass distribution diagram in a to-be-explored area to define a favorable ore-forming remote scenic spot.
2. The method for prospecting based on the magnesium high-iron angle amphibole pointer mineral according to claim 1, wherein the method for evaluating the minerality of the acidic rock mass in the step (3) is as follows:
condition one: judging the rock mass as suspected ore-forming rock mass when the ratio of the magnesium high-iron angle amphibole is more than or equal to 2/3; when the ratio of the magnesium high-iron amphibole to the rock is less than 1/3 and the amphibole and/or the glauconite type appears, judging that the rock mass is suspected not to be formed;
condition II: when the oxygen loss degree average value is more than or equal to delta NNO+1, judging that the rock mass is suspected to be the ore-forming rock mass; when the oxygen loss degree average value is smaller than delta NNO+1, judging that the rock mass is suspected not to be formed;
and (3) a third condition: when the average Mg# value is more than or equal to 0.5, judging that the rock mass is suspected to be the ore-forming rock mass; when the average value of the Mg# is less than 0.5, judging that the rock mass is suspected to be non-mineargenic;
judging the rock mass to be formed when the suspected rock mass to be formed in the first to third conditions are satisfied; and judging the rock mass not to be formed when any one or more conditions of the suspected rock mass not to be formed in the conditions one to three are met.
3. The method for searching for ores based on magnesium high-iron angle amphibole pointer minerals as claimed in claim 1, wherein 3-5 representative samples are collected for each rock mass in the step (1), and the rock property can be increased to 6-10 rock masses when the rock property is complex; the rock sample is greater than 5cm.
4. The method for prospecting a magnesium high-iron angle amphibole pointer mineral according to claim 1, wherein the main component of the angle amphibole in the step (2) comprises SiO 2 、TiO 2 、Al 2 O 3 、FeO、MnO、MgO、CaO、Na 2 O、K 2 O, F and Cl.
5. The method of claim 1, wherein the main component of the amphibole in step (3) calculates the type of amphibole according to hawthorone et al (2012) classification scheme.
6. A method of prospecting for a magnesium high-iron-angle amphibole pointer mineral according to claim 1, wherein the mineral type of amphibole relates to magnesium high-iron amphibole, magnesium glauconite, ti-containing magnesium glauconite, actinolite, leek amphibole, magnesium amphibole, glauconite, iron amphibole.
7. The method for finding ores based on magnesium high-iron angle amphibole pointer minerals as claimed in claim 1, wherein the ores in the ore-forming remote-view areas are porphyry-skarn or magma hot-liquid type Fe-Cu-Mo-Au ore deposits.
CN202310163595.1A 2023-02-24 2023-02-24 Ore finding method based on magnesium high-iron angle amphibole pointer mineral Pending CN116359254A (en)

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