CN110376350A - The method for measuring high common lead Zircon age and source region initial lead isotopics - Google Patents
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Abstract
The invention belongs to Zircon age measurement and source region setting technical fields, specifically disclose a kind of method for measuring high common lead Zircon age and source region initial lead isotopics, as follows: step 1, Zircon age data decimation；Step 2, it chooses238U/204Pb‑206Pb/204Pb data and corresponding error；Step 3, using in Zircon age data in above-mentioned steps 1, step 2238U/204Pb and206Pb/204Pb data and corresponding error, obtain206Pb‑238U isochrone age, MSWD value and206Pb/204Pb initial lead isotopics information；Step 4, it chooses235U/204Pb‑207Pb/204Pb data and corresponding error；Step 5, using in age data in above-mentioned steps 1, step 4235U/204Pb and207Pb/204Pb data and corresponding error, obtain207Pb‑235U isochrone age, MSWD value and207Pb/204Pb initial lead isotopics information；Step 6, more above-mentioned206Pb‑238U isochrone age with207Pb‑235U isochrone age calculates harmonious degree Concordant%, completes the measurement of Zircon age and source region initial lead isotopics.Method of the invention helps to vitalize high common lead age data, and that improves specific lithology determines Nian Xiaoguo.
Description
Technical field
The invention belongs to Zircon age measurement and source region setting technical fields, and in particular to a kind of high common lead zircon of measurement
The method of age and source region initial lead isotopics.
Background technique
Zircon uranium lead age determination techniques method is the current method for obtaining geologic body age mature and reliable the most, with ten
Divide extensively, plays the part of very crucial role in solving great earth problem in science.But high common lead Zircon age is accurate
Measurement is undecided, is primarily due to common lead and is difficult to accurately estimate and deduct.
High common lead zircon is widely present in pegmatite, basic-ultrabasic rock, and the zircon of hydrothermal origin is under normal conditions
Containing higher common lead, the Zircon age for accurately defining this kind of lithology or the origin cause of formation is caused to become more difficult.Solution at present
The certainly method of this problem is to explore to choose other alternative accessory minerals as the object for determining year, for example choose baddeleyite and make
The object that year is determined for basic-ultrabasic rock chooses the object that the monazite of symbiosis is limited as the pegmatite age.Although above-mentioned side
Method solves the problems, such as to a certain extent, but standard substance wretched insufficiency, uranium lead system do not close and data processing method not at
The problems such as ripe, constrains the extensive utilization of the above method.At the same time, trace information entrained by high common lead zircon is also lost
, for hydrothermal solution zircon, existing research show its formed with mineralising have it is close contact, if common lead cannot be reasonable
Estimation, that ore -forming age, ore-forming material etc. key geological information can not just obtain.
The method for lacking the high common lead age data of reasonable computation at present causes a large amount of high common lead age datas can not benefit
With.
Summary of the invention
The purpose of the present invention is to provide one kind quantitatively to calculate high common lead Zircon age and source region initial lead isotope groups
At method, this method helps to vitalize high common lead age data, and that improves specific lithology determines Nian Xiaoguo.
Realize the technical solution of the object of the invention: a kind of to measure high common lead Zircon age and source region initial lead isotope groups
At method, method includes the following steps:
Step 1, high common lead Zircon age data decimation；
Step 2, it chooses238U/204Pb-206Pb/204Pb high common lead Zircon age data and corresponding error；
Step 3, using the high common lead Zircon age data chosen in above-mentioned steps 1, choose in step 2 and obtain
's238U/204Pb and206Pb/204Pb high common lead Zircon age data and corresponding error obtain206Pb-238U isochrone age,
Average weighted deviations MSWD value and206Pb/204Pb initial lead isotopics information；
Step 4, it chooses235U/204Pb-207Pb/204Pb high common lead Zircon age data and corresponding error；
Step 5, using the high common lead Zircon age data chosen in above-mentioned steps 1, choose in step 4 and obtain
's235U/204Pb and207Pb/204Pb high common lead Zircon age data and corresponding error obtain207Pb-235U isochrone age,
Average weighted deviations MSWD value and207Pb/204Pb initial lead isotopics information；
Step 6, compare obtained in above-mentioned steps 3206Pb-238Obtained in U isochrone age and above-mentioned steps 5207Pb
-235U isochrone age calculates harmonious degree Concordant%, completes high common lead Zircon age and the same position of source region initial lead
The measurement of element composition.
It is chosen in the step 1 in high common lead Zircon age data206Pb/204The data of Pb < 2000.
The step 2 specifically refers to: choosing238U/204Pb high common lead Zircon age data and corresponding error information,
It chooses206Pb/204Pb high common lead Zircon age data and corresponding error information.
If not having in the step 2238U/204Pb high common lead Zircon age data, then high common lead Zircon age number
It is according to form206Pb/238U passes through formula238U/204Pb=(206Pb/204Pb)/(206Pb/238U), calculate and obtain238U/204Pb high
Common lead Zircon age data.
It is obtained in the step 3 using Isoplot software206Pb-238U isochrone age, average weighted deviations
MSWD value and206Pb/204Pb initial lead isotopics information.
The step 4 specifically refers to: choosing235U/204Pb high common lead Zircon age data and corresponding error information, choosing
It takes207Pb/204Pb high common lead Zircon age data and corresponding error information.
If not having in the step 4235U/204Pb high common lead Zircon age data, then high common lead Zircon age number
It is according to form207Pb/235U passes through formula235U/204Pb=(207Pb/204Pb)/(207Pb/235U), calculate and obtain235U/204Pb high
Common lead Zircon age data.
It is obtained in the step 5 using Isoplot software207Pb-235U isochrone age, average weighted deviations
MSWD value and207Pb/204Pb initial lead isotopics information.
The calculation formula of harmonious degree is Concordant%=in the step 5206Pb-238U isochrone age/207Pb
-235U isochrone age * 100.
The beneficial technical effect of the present invention lies in: the accurate deduction of common lead is the high common lead age data of reasonable computation
Premise, the present invention are directed to this critical issue, using innovative measuring method, obtain reasonable age estimation, and basic herein
On, inverse source region initial lead isotopics, to provide richer geological information.Method of the invention has applied to high common
Lead Data processing, and with concordant age, weighting the age,207The Pb correction age compares, and obtains one in error range
The age data of cause.In addition, obtain source region initial lead isotopics, inverting source characteristic.Using method of the invention
More abundant source region information can be obtained, provides reliable scientific basis for tracer.
Detailed description of the invention
Fig. 1 is provided by the present invention206Pb-238U isochrone age, MSWD value and initial lead isotopics schematic diagram；
Fig. 2 is provided by the present invention207Pb-235U isochrone age, MSWD value and initial lead isotopics schematic diagram.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and examples.
Select in sub-alkalinerock zircon Secondary Ion Mass Spectrometry age data as research object.Secondary Ion Mass Spectrometry has height
Mass resolution, thus for low content204The detection of Pb has uniqueness.In addition secondary mass spectrum has high-space resolution
Rate helps to obtain multi-group data.Secondary Ion Mass Spectrometry data can obtain concordant age, isochrone age and207Pb corrects year
Age, three can mutually compare to judge the reasonability of isochrone age.
The method for measuring high common lead Zircon age and source region initial lead isotopics, method includes the following steps:
Step 1, high common lead Zircon age data decimation.
It chooses in high common lead Zircon age data206Pb/204The data of Pb < 2000 as next step processing object be
The following table 1, reference standard are the 4th column data in the following table 1.The 4th column data of table 1 is respectively less than 2000,204Pb has enough countings, because
And it can be used as process object.
The high common lead Zircon age data of table 1
Step 2, it chooses238U/204Pb-206Pb/204Pb high common lead Zircon age data and corresponding error.
It chooses238U/204Pb-206Pb/204Pb high common lead Zircon age data and corresponding error, i.e., the 2nd in table 1,3,
4,5 column data.It specifically refers to: choosing the 2nd column in table 1238U/204The 3rd column correspond in Pb high common lead Zircon age data and table 1
Error information；Choose the 4th column in table 1206Pb/204The corresponding error of 5th column in Pb high common lead Zircon age data and table 1
Data.
If not having above-mentioned data in tables of data, (data mode that provides is when high common lead Zircon age measures206Pb
/238U, rather than238U/204Pb), can pass through under normal circumstances206Pb/238U high common lead Zircon age data and206Pb/204Pb
High common lead Zircon age data, which calculate, to be obtained238U/204Pb high common lead Zircon age data, calculation formula are238U/204Pb=
(206Pb/204Pb)/(206Pb/238U)。
Step 3, using the high common lead Zircon age data chosen in above-mentioned steps 1, choose in step 2 and obtain
's238U/204Pb and206Pb/204Pb high common lead Zircon age data and corresponding error obtain206Pb-238U isochrone age,
Average weighted deviations MSWD value and206Pb/204Pb initial lead isotopics information.
It is obtained using Isoplot software206Pb-238U isochrone age, average weighted deviations MSWD value and206Pb
/204Pb initial lead isotopics information, as shown in Figure 1.Isoplot software is the professional software for handling age data, choosing
It selects206Pb-238U isochrone age makes module, and Isoplot software will automatically calculate out206Pb-238U isochrone age, average mark
Quasi- weighted deviations MSWD value,206Pb/204Pb initial lead isotopics value, by taking attached drawing 1 as an example206Pb-238U isochrone age is
620 ± 16,000,000 years, average weighted deviations MSWD value was 2.7,206Pb/204Pb initial lead isotope groups become 16.2 ±
1.3。
Step 4, it chooses235U/204Pb-207Pb/204Pb high common lead Zircon age data and corresponding error.
It chooses235U/204Pb-207Pb/204Pb high common lead Zircon age data and corresponding error, i.e., the 6th, 7 in table 1,
8,9 column datas.It specifically refers to: choosing the 6th column in table 1235U/204The 7th column correspond in Pb high common lead Zircon age data and table 1
Error information；Choose the 8th column in table 1207Pb/204The corresponding error of 9th column in Pb high common lead Zircon age data and table 1
Data.
If not having above-mentioned data in tables of data, (data mode that provides is when high common lead Zircon age measures207Pb
/235U, rather than235U/204Pb), can pass through under normal circumstances207Pb/235U high common lead Zircon age data and207Pb/204Pb
High common lead Zircon age data, which calculate, to be obtained235U/204Pb high common lead Zircon age data, calculation formula are235U/204Pb=
(207Pb/204Pb)/(207Pb/235U)。
Step 5, using the high common lead Zircon age data chosen in above-mentioned steps 1, choose in step 4 and obtain
's235U/204Pb and207Pb/204Pb high common lead Zircon age data and corresponding error obtain207Pb-235U isochrone age,
Average weighted deviations MSWD value and207Pb/204Pb initial lead isotopics information.
It is obtained using Isoplot software207Pb-235U isochrone age, average weighted deviations MSWD value and207Pb
/204Pb initial lead isotopics information, as shown in Figure 2.Isoplot software is the professional software for handling age data, choosing
It selects207Pb-235U isochrone age makes module, and Isoplot software will automatically calculate out207Pb-235U isochrone age, average mark
Quasi- weighted deviations MSWD value,207Pb/204Pb initial lead isotopics value, by taking attached drawing 2 as an example207Pb-235U isochrone age is
610 ± 13,000,000 years, average weighted deviations MSWD value was 1.11,207Pb/204Pb initial lead isotope groups become 15.21 ±
0.17。
Step 6, compare obtained in above-mentioned steps 3206Pb-238Obtained in U isochrone age and above-mentioned steps 5207Pb
-235U isochrone age calculates harmonious degree Concordant%, completes high common lead Zircon age and the same position of source region initial lead
The measurement of element composition.
The calculation formula of harmonious degree is Concordant%=206Pb-238U isochrone age/207Pb-235U isochrone year
Age * 100.
Obtained in above-mentioned steps 3206Pb-238U isochrone age is 620 ± 16,000,000 years, average weighted deviations
MSWD=2.7,206Pb/204Pb initial lead isotope groups become 16.2 ± 1.3；Obtained in above-mentioned steps 5207Pb-235Whens U etc.
The line age is 610 ± 13,000,000 years, average weighted deviations MSWD=1.11,207Pb/204Pb initial lead isotope groups become
15.21 ± 0.17, harmonious degree Concordant% are 98%, close to 100%, and206Pb-238U isochrone age and207Pb-235U
The error range of isochrone age is respectively 16,000,000 years and 13,000,000 years, the range of age be respectively 604~636,000,000 years and
597~623,000,000 years, there are intersection, the age was consistent in error range.
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, can be generally applicable to the processing and explanation of high common lead age data.Know what those of ordinary skill in the art had
Know in range, it can be with various changes can be made without departing from the purpose of the present invention.It is not described in detail in the present invention
Content can use the prior art.
Claims (9)
1. a kind of method for measuring high common lead Zircon age and source region initial lead isotopics, it is characterised in that: this method
The following steps are included:
Step 1, high common lead Zircon age data decimation；
Step 2, it chooses238U/204Pb-206Pb/204Pb high common lead Zircon age data and corresponding error；
Step 3, using the high common lead Zircon age data chosen in above-mentioned steps 1, choose in step 2 and to obtain238U
/204Pb and206Pb/204Pb high common lead Zircon age data and corresponding error obtain206Pb-238U isochrone age is averaged
Criteria weights deviation MSWD value and206Pb/204Pb initial lead isotopics information；
Step 4, it chooses235U/204Pb-207Pb/204Pb high common lead Zircon age data and corresponding error；
Step 5, using the high common lead Zircon age data chosen in above-mentioned steps 1, choose in step 4 and to obtain235U
/204Pb and207Pb/204Pb high common lead Zircon age data and corresponding error obtain207Pb-235U isochrone age is averaged
Criteria weights deviation MSWD value and207Pb/204Pb initial lead isotopics information；
Step 6, compare obtained in above-mentioned steps 3206Pb-238Obtained in U isochrone age and above-mentioned steps 5207Pb-235U
Isochrone age calculates harmonious degree Concordant%, completes high common lead Zircon age and source region initial lead isotope groups
At measurement.
2. a kind of side for measuring high common lead Zircon age and source region initial lead isotopics according to claim 1
Method, it is characterised in that: chosen in the step 1 in high common lead Zircon age data206Pb/204The data of Pb < 2000.
3. a kind of side for measuring high common lead Zircon age and source region initial lead isotopics according to claim 1
Method, it is characterised in that: the step 2 specifically refers to: it chooses238U/204Pb high common lead Zircon age data and corresponding mistake
Difference data is chosen206Pb/204Pb high common lead Zircon age data and corresponding error information.
4. a kind of side for measuring high common lead Zircon age and source region initial lead isotopics according to claim 3
Method, it is characterised in that: if not having in the step 2238U/204Pb high common lead Zircon age data, then high common lead zircon
Age data form is206Pb/238U passes through formula238U/204Pb=(206Pb/204Pb)/(206Pb/238U), calculate and obtain238U
/204Pb high common lead Zircon age data.
5. a kind of side for measuring high common lead Zircon age and source region initial lead isotopics according to claim 4
Method, it is characterised in that: obtained in the step 3 using Isoplot software206Pb-238U isochrone age, average weight
Deviation MSWD value and206Pb/204Pb initial lead isotopics information.
6. a kind of side for measuring high common lead Zircon age and source region initial lead isotopics according to claim 5
Method, it is characterised in that: the step 4 specifically refers to: choosing235U/204Pb high common lead Zircon age data and corresponding error
Data are chosen207Pb/204Pb high common lead Zircon age data and corresponding error information.
7. a kind of side for measuring high common lead Zircon age and source region initial lead isotopics according to claim 6
Method, it is characterised in that: if not having in the step 4235U/204Pb high common lead Zircon age data, then high common lead zircon
Age data form is207Pb/235U passes through formula235U/204Pb=(207Pb/204Pb)/(207Pb/235U), calculate and obtain235U
/204Pb high common lead Zircon age data.
8. a kind of side for measuring high common lead Zircon age and source region initial lead isotopics according to claim 7
Method, it is characterised in that: obtained in the step 5 using Isoplot software207Pb-235U isochrone age, average weight
Deviation MSWD value and207Pb/204Pb initial lead isotopics information.
9. a kind of side for measuring high common lead Zircon age and source region initial lead isotopics according to claim 8
Method, it is characterised in that: the calculation formula of harmonious degree is Concordant%=in the step 5206Pb-238U isochrone year
Age/207Pb-235U isochrone age * 100.
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