CN109839429A - A kind of judgement alkaline rock type mineral deposit diagenetic and metallogenic age method - Google Patents
A kind of judgement alkaline rock type mineral deposit diagenetic and metallogenic age method Download PDFInfo
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- CN109839429A CN109839429A CN201711248122.2A CN201711248122A CN109839429A CN 109839429 A CN109839429 A CN 109839429A CN 201711248122 A CN201711248122 A CN 201711248122A CN 109839429 A CN109839429 A CN 109839429A
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Abstract
The invention belongs to mineral deposit identification technology fields, and in particular to a kind of judgement alkaline rock type mineral deposit diagenetic and metallogenic age method, comprising the following steps: step 1: acquisition alkaline rock ore sample；Step 2: diagnostic mineral is crushed and selected to acquisition sample ore；Step 3: the Within Monominerals sub-elected are pre-processed and is irradiated；Step 4: heating heating stage by stage carries out Ar-Ar to Within Monominerals and determines year；Step 5: data processing obtains alkaline rock type mineral deposit Diagenetic And Mineralization Ages.Judge that alkaline rock type mineral deposit diagenetic and metallogenic age method gives full play to Ar-Ar and determines the advanced technology means in year in the effect for determining alkaline rock type mineral deposit diagenetic and metallogenic age designed by the present invention, the accurate age that the metallogenic period is decomposited from complicated geological phenomenon for research ore deposit mechanism and instructs mineral exploration to have great importance.
Description
Technical field
The invention belongs to mineral deposit identification technology fields, and in particular to a kind of judgement alkaline rock type mineral deposit diagenetic and metallogenic age side
Method.
Background technique
Alkaline rock type mineral deposit, which refers to, originates in the intracorporal Deposit of magmatic differentiation of alkalinity-peralkaline rock, and mineralization body is generally focused on
In certain a part of alkaline rock, the lithology or rock mass top arcuate richness volatile matter that go out such as alkaline magma advanced stage residual liquor crystalline substance
Section.Rock mass alkalinity index usually judges that calculation formula is б=(K with Li Teman index (б)2O+Na2O)2/(SiO2- 43), б
Value is bigger, and degree of alkalinity is stronger.Its diagnostic mineral is alkali pyroxene (sodium matter pyroxene), alkaline Zn-air battery (osannite), aegirine, nepheline
And feldspathoid.
Recent study shows that there are many sort of deposit related with alkaline rock, and distribution is quite extensive, and scale also compares
It is huge.For example uranothorite bed has Liaoning horse racing mineral deposit, the Yunnan mineral deposit Pu Xiong, Qinghai mineral deposit Xiang Ka etc.；Rare metal and rare earth ore deposit has four
River yak level ground mineral deposit, the stockaded village Mu Luo mineral deposit and Xinjiang Bo Zi fruit mineral deposit etc.；Gold deposit has the Ke Lipuke of Colorado
In can mineral deposit, the mineral deposit La Dulamu of Papua New Guinea and river Associated mineral deposit etc.；There is New Mexico in the mineral deposit Cu-Au-Mo
The plug granny rag orchid card mineral deposit in state, the La Plata mineral deposit of Colorado and the mineral deposit para Bo Luwa in South Africa etc.；U-Th-
Be-Zr-REE-Nb polymetallic deposit includes mono- mineral deposit eight 〇 of the Inner Mongol, Saudi mineral deposit Sai Yide etc., wherein above-mentioned
Uranothorite bed also contain a certain amount of rare sugars.
Currently, the diagenetic and metallogenic age in this kind of mineral deposit is usually determined using the U-Pb age of zircon in alkaline rock, but
It is since zircon exists mostly in the form of aggregate in alkaline rock, without preferable crystalline form, and zircon is substantially without annulus,
It is in black in cathodoluminescence photo, is unfavorable for determining year, therefore judge the alkaline rock type mineral deposit age with zircon U-Pb age, it is quasi-
True property is relatively poor.Moreover alkaline magma, there are advanced stage hydrothermal solution autometasomatism, hydrothermal solution zircon easy to form and original zircons are mixed
Confuse, to Zircon U-Pb Age, there is also certain interference.Therefore, it is necessary to study it is a kind of effectively judge alkaline rock type mineral deposit diagenesis at
The method in mine age.
The present invention passes through the diagnostic mineral to alkaline rock --- osannite, sodium matter pyroxene, feldspathoid, nepheline or aegirine into
Row40Ar/39Ar determines year, and then determines the Diagenetic And Mineralization Ages in alkaline rock type mineral deposit.This method has economic, practical, accurate, fast
The advantage of speed, is very necessary and has great importance to alkaline rock type mineral deposit Chronologic Study.
Summary of the invention
It is an object of the invention to overcome zircon to judge the low defect of alkaline rock type mineral deposit diagenetic and metallogenic age accuracy, mention
For a kind of judgement alkaline rock type mineral deposit diagenetic and metallogenic age method.
The technical scheme adopted by the invention is that:
A kind of judgement alkaline rock type mineral deposit diagenetic and metallogenic age method, method includes the following steps:
Step 1: acquisition alkaline rock ore sample；
Step 2: diagnostic mineral is crushed and selected to acquisition sample ore；
Step 3: the Within Monominerals sub-elected are pre-processed and is irradiated；
Step 4: heating heating stage by stage carries out Ar-Ar to Within Monominerals and determines year；
Step 5: data processing obtains alkaline rock type mineral deposit Diagenetic And Mineralization Ages.
Step 1 as described above: acquisition alkaline rock ore sample, comprising: field on-the-spot investigation, system acquisition alkaline rock
Ore sample, sample requirement is fresh, and sample is having a size of 3 × 6 × 9cm, and 5 pieces of sample size.
Step 2 as described above: diagnostic mineral is crushed and selected to acquisition sample ore, comprising: carry out first to sample equal
Even crushing, grinding particle size are 0.2~0.4mm；Then by elutriation, sodium matter pyroxene, osannite are selected under the microscope, like long
One of stone, aegirine and nepheline, the Within Monominerals weight picked out is in 1~2g, and purity is 98% or more.
Step 3 as described above: the Within Monominerals sub-elected are pre-processed and is irradiated, comprising: to the simple ore sub-elected
Object acetone, deionized water shake cleaning in ultrasonic cleaner, then dry sample；Within Monominerals are sealed into quartz after cleaning
It is sent in bottle and receives neutron exposure in nuclear reactor, irradiation uses the duct B4, and neutron-current is about 2.6 × 1013n·cm-2·s-1, irradiation total time is 2880min, and integrated neutron flux is 4.49 × 1018n·cm-2；Sample after irradiation places 1~2
Month, when radioactive dosage is down to safe operating range, carry out the extraction of argon.
Step 4 as described above: heating heating stage by stage carries out Ar-Ar to Within Monominerals and determines year, comprising: Within Monominerals are through too fast
After neutron irradiation, heating stage by stage is carried out in 400~1400 DEG C of temperature ranges to it and is heated, and to the argon of each temperature spot release
Gas carries out age dating；It carries out mass-spectrometer measurement using the rare gas mass spectrograph Helix SFT that receive more, it is same to analyze monomineralic Ar
Position element composition, according to it40Ar*/39Ar radiometer calculates age value；By gradually heating up to Within Monominerals, the discharged argon of heating is asked
The age obtained is a series of age values of the same sample；This step is to the demand of Within Monominerals sample at tens milligrams to several hundred
Milligram.
The heat up stage by stage heat source of heating of step 4 as described above is stove or continuous laser.
Step 5 as described above: data processing obtains alkaline rock type mineral deposit Diagenetic And Mineralization Ages, comprising: to Within Monominerals point
It analyses the data measured to be handled using ArArCALC program, including to sensitivity, resolution ratio, the selection of background value and Ar-Ar
Isotopic ratio, age and error calculation, and draw Within Monominerals Ar-Ar plateau age and positive and negative isochrone age figure.
The beneficial effects of the present invention are:
(1) method that the present invention designs acquires sample object, analysis test request defines, strong operability；
(2) present invention is the analysis based on U-Th-Be-Zr-REE-Nb polymetallic deposit ore sample experimental data and place
Reason, alkaline rock type mineral deposit diagenetic and metallogenic age research achievement and with Qinghai perfume (or spice) card, Yunnan Jian Shui, Liaoning horse racing and Saudi Arabia
The judgment method that alkaline rock type mineral deposit known to Arabic Sai Yide etc. (point) designs on the basis of comparing, covers face
Extensively, validity is good, strong applicability, accuracy are good.
(3) this method determines year diagnostic mineral progress Ar-Ar in alkaline rock, and measuring accuracy is high, and sample sorting is fairly simple,
It has accuracy height, interference few relative to Zircon U-Pb Age method in alkaline rock, and method is mature, while also keeping away
Exempt from uranothorite object and determines wet chemistry digestion process cumbersome, time-consuming when year.
(4) judge that alkaline rock type mineral deposit diagenetic and metallogenic age method gives full play to Ar-Ar and determines year designed by the present invention
Advanced technology means are decomposited into from complicated geological phenomenon in the effect for determining alkaline rock type mineral deposit diagenetic and metallogenic age
The accurate age of mine phase for research ore deposit mechanism and instructs mineral exploration to have great importance.
Detailed description of the invention
A kind of Fig. 1: flow chart judging alkaline rock type mineral deposit diagenetic and metallogenic age method provided by the present invention；
Fig. 2: osannite in certain mineral deposit alkali granite in the embodiment of the present invention40Ar-39Ar plateau age spectrogram
Fig. 3: osannite in certain mineral deposit alkali granite in the embodiment of the present invention40Ar/36Ar-39Ar/36The anti-isopleth of Ar
Figure
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and examples.
A kind of judgement alkaline rock type mineral deposit diagenetic and metallogenic age method, method includes the following steps:
Step 1: acquisition alkaline rock ore sample；
Field on-the-spot investigation, system acquisition alkaline rock ore sample, sample requirement is fresh, sample having a size of 3 × 6 × 9cm,
5 pieces of sample size.
Step 2: diagnostic mineral is crushed and selected to acquisition sample ore；
Diagnostic mineral is crushed and selected to acquisition sample ore, comprising: uniformly crushed to sample first, grinding particle size
For 0.2~0.4mm (40~60 mesh or 60~80 mesh)；Then by elutriation, select under the microscope sodium matter pyroxene, osannite,
Which kind of mineral one of feldspathoid, aegirine and nepheline determine to select by the number of content, usually select the mine more than content
Object, within 1~2g, purity must avoid crystal stock, impurity and alteration occurs the Within Monominerals weight picked out 98% or more
Mineral.
Step 3: the Within Monominerals sub-elected are pre-processed and is irradiated；
Cleaning is shaken in ultrasonic cleaner to the Within Monominerals acetone that sub-elects, deionized water, then dries sample；
Within Monominerals, which are sealed, after cleaning receives neutron exposure into sending in quartzy bottle in nuclear reactor, irradiation uses the duct B4, neutron-current
About 2.6 × 1013n·cm-2·s-1, irradiation total time is 2880min, and integrated neutron flux is 4.49 × 1018n·cm-2；Spoke
Sample according to after is placed 1~2 month, when radioactive dosage is down to safe operating range, carries out the extraction of argon.
Step 4: heating heating stage by stage carries out Ar-Ar to Within Monominerals and determines year；
Within Monominerals carry out heating stage by stage in 400~1400 DEG C of temperature ranges to it and heat after fast neutron irradiated, and
Age dating is carried out to the argon gas of each temperature spot release；Carry out mass spectrum survey using the rare gas mass spectrograph HelixSFT that receive more
Amount, analyzes monomineralic Ar isotopics, according to it40Ar*/39Ar radiometer calculates age value；By to Within Monominerals gradually
A series of age values that the age that discharged argon acquires is the same sample are heated in heating；Need of this step to Within Monominerals sample
The amount of asking is at tens milligrams to several hundred milligrams.The heat source of heating of heating up stage by stage can be stove or continuous laser.
Step 5: data processing obtains alkaline rock type mineral deposit Diagenetic And Mineralization Ages；
The data measured to Within Monominerals analysis are handled using ArArCALC program, including to sensitivity, resolution ratio, back
The selection of scape value and Ar-Ar isotopic ratio, age and error calculation, and draw Within Monominerals Ar-Ar plateau age and it is positive and negative equal whens
Line year age map.
Invention is further described in detail by taking certain U-Th-Be-Zr-REE-Nb polymetallic deposit as an example below.
Step 1: carrying out field study in certain mineral deposit, which is alkali granite, to the alkali granite
Ore sample is acquired, and sample requirement is fresh, generally 3 × 6 × 9cm.
Step 2: choosing alkali granite sample ore (sample number into spectrum TC15-2-17) collected and be processed.It is first
First sample is uniformly crushed, it is broken to granularity be about 0.2~0.4mm (40~60 mesh or 60~80 mesh)；Then pass through elutriation,
Fresh osannite (osannite in alkali granite is picked out under the microscope
Content is up to 5%-20%), weed out crystal stock, impurity and the osannite that alteration occurs, the osannite weight picked out
Amount is in 2g or so, and purity is up to 98% or more.
Step 3: the osannite sub-elected being pre-processed, including with acetone, deionized water in ultrasonic cleaner
Concussion cleaning, then dries sample.Osannite after cleaning, which is sealed, receives neutron exposure into sending in quartzy bottle in nuclear reactor, shine
It penetrates using the duct B4, neutron-current is about 2.6 × 1013n·cm-2·s-1, irradiation total time is 2880min, and integrated neutron is logical
Amount is 4.49 × 1018n·cm-2, irradiation parameters J=0.002905.Sample after irradiation is placed 1~2 month, and radiopharmaceutical agent is worked as
When amount is down to safe operating range, the extraction of argon is carried out.
Step 4: osannite carries out sublevel with stove in 400~1400 DEG C of temperature ranges after fast neutron irradiated, to it
Duan Shengwen heating, and age dating is carried out to the argon gas of each temperature spot release.Osannite sample size is 40mg, dilute with receiving more
There is mass spectrometer Helix SFT to carry out mass-spectrometer measurement, the Ar isotopics of osannite is analyzed, according to it40Ar*/39Ar ratio
Value can calculate age value, and a series of age values acquired are as shown in table 1.
The Ar-Ar of osannite determines year analysis result in certain the mineral deposit alkali granite of table 1
Step 5: the osannite data that measure of analysis are handled using ArArCALC program, including to sensitivity, point
Resolution, the selection of background value and Ar-Ar isotopic ratio, age and error calculation, finally calculate osannite Ar-Ar plateau age is
123.11 ± 0.70Ma, MSWD=2.59 (MSWD is average weighted deviations) (as shown in Figure 2), anti-isochrone age are
124.35 ± 0.69Ma, MSWD=0.41 (as shown in Figure 3).The two age relatively coincide, therefore, in the present embodiment mineral deposit at
Rock ore -forming age is 123.11 ± 0.7Ma.
The present invention is explained in detail above in conjunction with drawings and examples, but the present invention is not limited to above-mentioned implementations
Example, within the knowledge of a person skilled in the art, can also make without departing from the purpose of the present invention
Various change out.The content being not described in detail in the present invention can use the prior art.
Claims (7)
1. a kind of judgement alkaline rock type mineral deposit diagenetic and metallogenic age method, it is characterised in that: method includes the following steps:
Step 1: acquisition alkaline rock ore sample；
Step 2: diagnostic mineral is crushed and selected to acquisition sample ore；
Step 3: the Within Monominerals sub-elected are pre-processed and is irradiated；
Step 4: heating heating stage by stage carries out Ar-Ar to Within Monominerals and determines year；
Step 5: data processing obtains alkaline rock type mineral deposit Diagenetic And Mineralization Ages.
2. a kind of judgement alkaline rock type mineral deposit diagenetic and metallogenic age method according to claim 1, it is characterised in that: described
The step of one: acquisition alkaline rock ore sample, comprising: field on-the-spot investigation, system acquisition alkaline rock ore sample, sample requirement
Fresh, sample is having a size of 3 × 6 × 9cm, and 5 pieces of sample size.
3. a kind of judgement alkaline rock type mineral deposit diagenetic and metallogenic age method according to claim 1, it is characterised in that: described
Step 2: diagnostic mineral is crushed and selected to acquisition sample ore, comprising: uniformly crushed to sample first, grinding particle size
For 0.2~0.4mm；Then it by elutriation, is selected in sodium matter pyroxene, osannite, feldspathoid, aegirine and nepheline under the microscope
One kind, the Within Monominerals weight picked out is in 1~2g, and purity is 98% or more.
4. a kind of judgement alkaline rock type mineral deposit diagenetic and metallogenic age method according to claim 1, it is characterised in that: described
The step of three: the Within Monominerals sub-elected are pre-processed and are irradiated, comprising: to Within Monominerals acetone, the deionization sub-elected
Water shakes cleaning in ultrasonic cleaner, then dries sample；Within Monominerals are sealed into sending nuclear reactor in quartzy bottle after cleaning
In receive neutron exposure, irradiation uses the duct B4, and neutron-current is about 2.6 × 1013n·cm-2·s-1, irradiation total time be
2880min, integrated neutron flux are 4.49 × 1018n·cm-2；Sample after irradiation is placed 1~2 month, and radioactive dosage is worked as
When being down to safe operating range, the extraction of argon is carried out.
5. a kind of judgement alkaline rock type mineral deposit diagenetic and metallogenic age method according to claim 1, it is characterised in that: described
Step 4: heating heating stage by stage carries out Ar-Ar to Within Monominerals and determines year, comprising: Within Monominerals are after fast neutron irradiated, to it
Heating heating stage by stage is carried out in 400~1400 DEG C of temperature ranges, and age dating is carried out to the argon gas of each temperature spot release；
It carries out mass-spectrometer measurement using the rare gas mass spectrograph Helix SFT that receive more, analyzes monomineralic Ar isotopics, according to
Its40Ar*/39Ar radiometer calculates age value；By gradually heating up to Within Monominerals, the age that the discharged argon of heating acquires is same
A series of age values of one sample；This step is to the demand of Within Monominerals sample at tens milligrams to several hundred milligrams.
6. a kind of judgement alkaline rock type mineral deposit diagenetic and metallogenic age method according to claim 1, it is characterised in that: described
Step 4 heat up stage by stage heating heat source be stove or continuous laser.
7. a kind of judgement alkaline rock type mineral deposit diagenetic and metallogenic age method according to claim 1, it is characterised in that: described
Step 5: data processing obtains alkaline rock type mineral deposit Diagenetic And Mineralization Ages, comprising: the data measured to Within Monominerals analysis use
ArArCALC program is handled, including to sensitivity, resolution ratio, the selection of background value and Ar-Ar isotopic ratio, the age and
Error calculation, and draw Within Monominerals Ar-Ar plateau age and positive and negative isochrone age figure.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109459383A (en) * | 2018-12-07 | 2019-03-12 | 枣庄市交运混凝土有限公司 | A method of determining building stones and asphalt adhesion |
| CN111044545A (en) * | 2019-12-30 | 2020-04-21 | 核工业北京地质研究院 | Method for effectively obtaining thorium-lead isotope age of thorium deposit |
| CN113092569A (en) * | 2021-04-08 | 2021-07-09 | 成都理工大学 | Method for determining mineral forming age of rare metal pegmatite |
-
2017
- 2017-11-29 CN CN201711248122.2A patent/CN109839429A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 国土资源部中国地质调查局: "《中国地质调查百项技术》", 30 November 2016, 地质出版社 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109459383A (en) * | 2018-12-07 | 2019-03-12 | 枣庄市交运混凝土有限公司 | A method of determining building stones and asphalt adhesion |
| CN109459383B (en) * | 2018-12-07 | 2021-08-10 | 枣庄市交运混凝土有限公司 | Method for judging adhesiveness of stone and asphalt |
| CN111044545A (en) * | 2019-12-30 | 2020-04-21 | 核工业北京地质研究院 | Method for effectively obtaining thorium-lead isotope age of thorium deposit |
| CN113092569A (en) * | 2021-04-08 | 2021-07-09 | 成都理工大学 | Method for determining mineral forming age of rare metal pegmatite |
| CN113092569B (en) * | 2021-04-08 | 2023-07-18 | 成都理工大学 | Method for determining mineral age of rare metal pegmatite |
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Application publication date: 20190604 |