CN110907477A - Method for carrying out source analysis by utilizing zircon uranium lead and fission track double dating - Google Patents
Method for carrying out source analysis by utilizing zircon uranium lead and fission track double dating Download PDFInfo
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Abstract
The invention discloses a method for carrying out source analysis by utilizing zircon uranium lead and fission tracks in double fixed years, which comprises the following steps: (1) magnetically separating the sandstone fragments to obtain nonmagnetic minerals; (2) separating zircon from components in the nonmagnetic minerals by a heavy liquid separation technology, and polishing the surface of the zircon; (3) observing growth ring band characteristics of zircon particles to check uniform components and a magma growth mode thereof; (6) etching on the zircon particle sample by adopting a multiple etching technology; (7) attaching mica as an external detector to the etched zircon particle sample, and irradiating to induce fission tracks; (8) analyzing the number of fission tracks of the zircon particles and the standard sample particles under a high-magnification microscope, and decomposing the track age distribution into main age peaks; (9) and (4) determining the age of zircon U-Pb. The method can distinguish zircon formed by different sources at different generations, distinguish zircon rising at each time of different sources, and is more accurate and credible.
Description
Technical Field
The invention relates to a method for analyzing a source, in particular to a method for analyzing the source by utilizing zircon uranium lead and fission tracks for double dating.
Background
The traditional sedimentary rock source analysis method mainly comprises the following steps: a clastic rock debris component identification method, a heavy mineral method, an element composition identification method and the like. The method for identifying the rock debris components comprises the steps of systematically collecting clastic rock sediments at a research horizon, manufacturing a rock slice, and observing the rock debris components forming the clastic rock under a mirror, so that the lithology of the rock in a component source region can be roughly inferred. For rocks of the same lithology formed at different generations, this method cannot tell from which age the deposit came specifically. The heavy mineral method is to collect the clastic rock heavy minerals of the research horizon by a system, judge the rock from which the clastic rock heavy minerals come through elutriation and identification, and can roughly distinguish the major classes of the source rock, but the method has low precision in distinguishing the source region. The element composition discrimination method is to collect the deposit of the research horizon, and to determine the approximate source area of the deposit by testing the composition of the main and trace elements therein, and the discrimination precision of the method is also low.
The traditional sedimentary rock source analysis method has limited identification precision on a target layer source area, is too subjective to objectively and accurately judge the source area when the target layer is sedimentated, and urgently needs to establish a comprehensive identification method, so that the identification precision can be effectively improved, and the source area can be objectively identified.
Disclosure of Invention
The invention aims to provide a method for carrying out source analysis by utilizing zircon uranium lead and fission tracks in double definite years, which solves the problem that the traditional method cannot objectively identify sources, can distinguish zircon formed by different sources at different times, and can distinguish rising zircon of different sources at different times, so that the source analysis is more accurate and credible.
In order to achieve the above object, the present invention provides a method for source analysis using dual dating of uranium lead zircon and fission tracks, the method comprising:
(1) magnetically separating the sandstone fragments with the diameter of 63-400 mu m to obtain nonmagnetic minerals;
(2) separating zircon from components in the nonmagnetic minerals by a heavy liquid separation technology, and polishing the surface of the zircon;
(3) carrying out cathodoluminescence imaging inspection on the zircon particles through a scanning electron microscope with a cathode probe, and observing growth ring band characteristics of the zircon particles so as to inspect uniform components and a magma growth mode of the zircon particles;
(6) etching on the zircon particle sample by adopting a multiple etching technology;
(7) attaching mica as an external detector to the etched zircon particle sample, and irradiating by using a neutron flow to induce fission tracks until the induced tracks are generated;
(8) analyzing the number of fission tracks of the zircon particles and the standard particles under a high-magnification microscope, converting the number of the tracks into track ages by using a Binomfit program, and decomposing the track age distribution into main age peaks;
(9) carrying out laser ablation on zircon particles for a fixed year in a point mode by adopting excimer laser combined with a high-resolution sector magnetic field mass spectrometer, and testing by a method of measuring 1 external standard sample per a plurality of zircon particles to be tested; wherein GJ-1 standard sample is used as a main reference standard for dating, Si element is used as an internal standard sample, Nist610 standard sample is used for calculating the composition of trace elements, the isotope ratio, the age and the element concentration of zircon are calculated, and the source analysis is carried out through a harmonic diagram and a uranium-lead age distribution diagram of zircon.
Preferably, in step (1), the magnetic minerals are separated from the non-magnetic minerals at a low current of 0.6A.
Preferably, in step (2), the heavy liquid separation technique is to fill 2/3 of a cone funnel with methyl iodide, pour the nonmagnetic mineral into the funnel, stir it well and then stand it, remove the heavy mineral component at the bottom of the funnel, dry it and pick it with zircon under a microscope.
Preferably, in step (6), the multiple etching technique is to etch on the zircon particle sample in a eutectic melt of NaOH and KOH.
Preferably, the eutectic melt temperature is 228 ℃; the etching time is 14-21 h.
Preferably, in step (7), the density of the neutron stream is 1x1015n·cm-2。
Preferably, in step (7), the conditions of the external probe inducing fission tracks are: etching in 40% hydrogen fluoride at 21 ℃ for 45 min.
Preferably, in step (8), Fish Canyon tuff is used as a standard for Zeta calibration.
Preferably, the external standard comprises: ausz7-5, Plesovice, Temora2, 91500 and Nist 610.
Preferably, the zircon isotope ratio, age, and elemental concentration are calculated by IOLITE 2.5 software; the calculated zircon isotope ratio and age were processed by ISOPLOT 4.0 software to obtain a harmony map and a zircon uranium lead age profile.
The method for carrying out source analysis by using the zircon uranium lead and the fission track in double definite years solves the problem that the traditional method cannot objectively identify the source, and has the following advantages that:
according to the method, the zircon formed at different generations of each source can be distinguished according to age comparison of the scrap zircon uranium lead dating data and the source area by integrating the scrap zircon dating and fission track dating method, and the highly raised zircon of different sources in each generation can be distinguished by comparing the fission track data with the data of the source area, so that the analysis of the sources is more accurate and reliable.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A method for source analysis using dual dating of zircon uranium lead and fission tracks, the method comprising:
(1) crushing sandstone into fragments smaller than or equal to 1mm by using a high-pressure device, and separating sandstone fragments with the diameter of 63-400 mu m by using a screen;
(2) because zircon belongs to a non-magnetic heavy mineral (>3.4g/cm3) Separating magnetic minerals from nonmagnetic minerals by a Franz magnetic separator under low current (0.6A);
(3) separating zircon from components in the non-magnetic minerals by heavy liquid separation techniques: mixing iodomethane (d is 3.32 g/cm)3) 2/3 of the conical funnel is filled, nonmagnetic minerals are poured into the funnel, the funnel is fully stirred and placed for a plurality of minutes, heavy mineral components at the bottom are removed from the funnel, and zircon selection is carried out under a microscope after washing and air drying;
(4) zircon particles are picked and affixed to the teflon pad, polishing the exposed inner surface;
(5) carrying out cathodoluminescence imaging inspection on the zircon particles through a scanning electron microscope with a cathode probe, and observing growth ring band characteristics of the zircon particles so as to inspect uniform components and a magma growth mode of the zircon particles;
(6) etching 14 or 21 hours on each sample in a 228 ℃ NaOH and KOH eutectic melt by adopting a multiple etching technology;
(7) mica flakes were attached to the sample as an external probe and then sent to radiation using neutron flow 1x1015n·cm-2Irradiation was performed by etching in 40% hydrogen fluoride at 21 ℃ for 45min until an induced track was created;
(8) analyzing the number of fission tracks of zircon particles and standard particles by using Fish Canyon tuff as a Zeta calibration standard under a high-magnification microscope, then converting the number of the tracks into track ages by using a Binomfit program, and decomposing all track age distributions into main age peaks;
(9) age determination of zircon U-Pb: an excimer laser (ARF 193nm) was used in combination with a high resolution magnetic sector spectrometer (ICP-MS, Thermo ElementXR) in spot mode with a diameter of 30 μmThe method comprises subjecting crushed zircon to laser ablation for uranium and lead years, delivering ablation material (He, flow rate of 1, 0.5L/min) with gas flow, laser pulse repetition frequency of 5Hz, and energy density/fluence of 2.0J-cm-2Background 30s, ablation duration about 40s, tested by a method of measuring 1 external standard (Ausz7-5, Plesovice, Temora2, 91500, Nist610, external standard as age reference) per 10 zircon grains tested; using GJ-1 (key external standard) as a main reference standard for dating, using Si element (15.2 wt.%) as an internal standard, using a Nist610 standard to calculate the trace element composition, and using IOLITE 2.5 software to calculate the zircon isotope ratio, age, and element concentration; the calculated zircon isotope ratio and age were processed using ISOPLOT 4.0(Ludwig 2012) to obtain a harmony map and a zircon uranium lead age profile, and a source analysis was performed from the harmony map and the zircon uranium lead age profile.
The traditional clastic zircon dating method can only identify the formation age of clastic zircon, can not distinguish zircon formed in the same time from different sources, and the traditional fission traceage dating method can only distinguish the swelling age of clastic zircon and can not identify rising zircon in the same time from different sources. According to the method, by integrating the clastic zircon dating and fission track dating methods, not only can zircon formed by different sources at different generations be distinguished, but also zircon rising at different times of different sources can be distinguished, so that the source analysis is more accurate and reliable.
In conclusion, the method effectively overcomes the limitation and artificial subjectivity of the traditional single method, thereby improving the objectivity and precision of the identification of the object source region.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. A method for bi-dating source analysis using zircon uranium lead and fission tracks, the method comprising:
(1) magnetically separating the sandstone fragments with the diameter of 63-400 mu m to obtain nonmagnetic minerals;
(2) separating zircon from components in the nonmagnetic minerals by a heavy liquid separation technology, and polishing the surface of the zircon;
(3) carrying out cathodoluminescence imaging inspection on the zircon particles through a scanning electron microscope with a cathode probe, and observing growth ring band characteristics of the zircon particles so as to inspect uniform components and a magma growth mode of the zircon particles;
(6) etching on the zircon particle sample by adopting a multiple etching technology;
(7) attaching mica as an external detector to the etched zircon particle sample, and irradiating by using a neutron flow to induce fission tracks until the induced tracks are generated;
(8) analyzing the numbers of fission tracks of the zircon particles and the standard sample under a high-magnification microscope, converting the numbers of the tracks into track ages by using a Binomfit program, and decomposing the track age distribution into main age peaks;
(9) carrying out laser ablation on zircon particles for a fixed year in a point mode by adopting excimer laser combined with a high-resolution sector magnetic field mass spectrometer, and testing by a method of measuring 1 external standard sample per a plurality of zircon particles to be tested; wherein GJ-1 standard sample is used as a main reference standard for dating, Si element is used as an internal standard sample, Nist610 standard sample is used for calculating the composition of trace elements, the isotope ratio, the age and the element concentration of zircon are calculated, and the source analysis is carried out through a harmonic diagram and a uranium-lead age distribution diagram of zircon.
2. The method for source analysis by means of double dating of uranium lead zircon and fission tracks according to claim 1, characterized in that in step (1), magnetic minerals are separated from non-magnetic minerals at low current of 0.6A.
3. The method for source analysis by means of double dating of uranium and lead zircon and fission tracks according to claim 1, wherein in the step (2), the heavy liquid separation technique comprises filling 2/3 of a cone funnel with methyl iodide, pouring nonmagnetic minerals into the funnel, fully stirring and standing, removing heavy mineral components at the bottom from the funnel, drying and then carrying out zircon picking under a microscope.
4. The method for source analysis using dual dating of uranium lead zircon and fission tracks according to claim 1, wherein in step (6), the multiple etching technique is etching on a sample of zircon particles in a eutectic melt of NaOH and KOH.
5. The method for bi-dating source analysis using uranium lead zircon and fission tracks according to claim 4, wherein the eutectic melt temperature is 228 ℃; the etching time is 14-21 h.
6. Method for source analysis using dual dating of uranium lead zircon with fission tracks according to claim 1, characterized in that in step (7) the neutron flow has a density of 1x1015n·cm-2。
7. The method for source analysis using dual dating of uranium lead zircon with fission tracks according to claim 1, wherein in step (7), the conditions for the external probe to induce fission tracks are: etching in 40% hydrogen fluoride at 21 ℃ for 45 min.
8. The method for source analysis using dual dating of uranium lead zircon and fission tracks according to claim 1, wherein in step (8) Fish Canyon tuff is used as a standard for Zeta calibration.
9. The method for dual dating of source analysis using uranium lead zircon and fission tracks according to claim 1, wherein the external standard comprises: ausz7-5, Plesovice, Temora2, 91500 and Nist 610.
10. The method for source analysis using dual dating of uranium lead zircon and fission tracks according to claim 1, wherein the zircon isotope ratio, age and element concentration are calculated by IOLITE 2.5 software; the calculated zircon isotope ratio and age were processed by ISOPLOT 4.0 software to obtain a harmony map and a zircon uranium lead age profile.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111398571A (en) * | 2020-05-19 | 2020-07-10 | 中南大学 | Mineral exploration method for rapidly judging mineral potential of skarn deposit by using zircon |
| CN111505005A (en) * | 2020-04-25 | 2020-08-07 | 中南大学 | Mineral exploration method for rapidly judging mineral potential of vein-like mineral deposit by using zircon |
| CN111749679A (en) * | 2020-07-06 | 2020-10-09 | 宋立才 | Method and device for determining shale gas reservoir enrichment time node |
| CN116297465A (en) * | 2023-05-25 | 2023-06-23 | 中国地质科学院地质力学研究所 | Standard sample analysis method based on zircon fission track legal year |
| CN116609158A (en) * | 2023-07-17 | 2023-08-18 | 中国科学院青藏高原研究所 | Normal temperature etching method and application of monazite fission track |
| CN117330734A (en) * | 2023-11-22 | 2024-01-02 | 中国地质科学院地质力学研究所 | Standard sample analysis method based on zircon fission track legal year |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111505005A (en) * | 2020-04-25 | 2020-08-07 | 中南大学 | Mineral exploration method for rapidly judging mineral potential of vein-like mineral deposit by using zircon |
| CN111398571A (en) * | 2020-05-19 | 2020-07-10 | 中南大学 | Mineral exploration method for rapidly judging mineral potential of skarn deposit by using zircon |
| CN111398571B (en) * | 2020-05-19 | 2021-04-20 | 中南大学 | Mineral exploration method for rapidly judging mineral potential of skarn deposit by using zircon |
| CN111749679A (en) * | 2020-07-06 | 2020-10-09 | 宋立才 | Method and device for determining shale gas reservoir enrichment time node |
| CN116297465A (en) * | 2023-05-25 | 2023-06-23 | 中国地质科学院地质力学研究所 | Standard sample analysis method based on zircon fission track legal year |
| CN116609158A (en) * | 2023-07-17 | 2023-08-18 | 中国科学院青藏高原研究所 | Normal temperature etching method and application of monazite fission track |
| CN116609158B (en) * | 2023-07-17 | 2023-10-20 | 中国科学院青藏高原研究所 | Normal temperature etching method and application of monazite fission track |
| CN117330734A (en) * | 2023-11-22 | 2024-01-02 | 中国地质科学院地质力学研究所 | Standard sample analysis method based on zircon fission track legal year |
| CN117330734B (en) * | 2023-11-22 | 2024-05-28 | 中国地质科学院地质力学研究所 | Standard sample analysis method based on zircon fission track legal year |
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