Method for discriminating zircon protolith type by using zircon lattice damage
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A technology of zircon lattice and rock type, which is applied in the field of judging the type of zircon proto-rock by using zircon lattice damage, can solve problems such as zircon deviation, achieve high judgment accuracy, easy to learn and apply, and simple operation
Active Publication Date: 2022-04-08
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Therefore, judging the magmatic origin of zircons based
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Embodiment 1
[0043] Example 1 (No. 1 zircon)
[0044] (1) Collect sandstone, select zircon particles, and inlay and fix zircons by making epoxy resin targets;
[0045] (2) Use dating techniques (such as ICP-MS, SHRIMP, SIMS, etc.) to determine the zircon U-Pb age, U and Th content;
[0046] (3) Determination of zircon crystallization degree by laser Raman instrument;
[0047] (3.1) Place the inlaid zircons on the test bench, use a laser with a wavelength of 512nm to focus on the area of the zircons to be tested, and use a 1800 grating for testing.
[0048] (3.2) Obtain zircon at 0-1200cm -1 The spectral signal within the range, the specific peak range is ~357cm -1 、~439cm -1 、~974cm -1 、~1008cm -1 Nearby; focus collection ~ 1008cm -1 Values near the peak spectrum (such as image 3 shown).
[0049] (4) According to the decay equation and calculation formula, calculate the theoretical alpha decay of zircon through the tested U-Pb age and U and Th content;
[0050] The decay for...
Embodiment 2
[0063] Embodiment 2 (number 2 zircon), the process of embodiment 3 (number 3 zircon) and embodiment 4 (number 4 zircon) are consistent with embodiment 1, and the data and discrimination results of embodiment 1-4 are as in table 1 Shown:
[0064] Table 1
[0065]
[0066] Taking zircon No. 1 in Example 1 as an example, the age of No. 1 is 109.9 Ma, and the U and Th contents obtained from the test are 1875.15 ppm and 3326.26 ppm, respectively. Which is calculated to obtain:
[0067] u 238 Content=0.9928*1875.15=1861.65ppm;
[0068] u 235 Content = 0.0072*1875.15 = 13.5ppm;
[0069] According to the decay formula of step (4), the alpha decay amount is calculated as:
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Abstract
The invention discloses a method for judging the type of zircon protolith by using zircon lattice damage. The method comprises the following steps: S1, determining the U-Pb age, U content and Th content of the zircon by using a dating technology, and calculating the theoretical alpha decay amount of the zircon through the tested U-Pb age and U content and Th content according to a decay formula; s2, measuring the crystallinity of the zircon by using a laser Raman instrument, and calculating the full width at half maximum and the peak position of a zircon Raman vibration peak according to the crystallinity of the zircon; s3, performing projection on the alpha decay amount, the Raman spectrum peak full width at half maximum and the peak value to judge the protolith type of zircon; from the principle of lattice damage, a functional relationship is established with zircon protolith and a cause process. According to the method, a probability statistical algorithm is utilized to establish a discrimination formula, a probability value belonging to zircon protolith is given, the method is a parent user type discrimination method, the discrimination method has simple projection discrimination and is convenient for visual observation, and meanwhile, higher judgment accuracy is obtained in a probability mode.
Description
technical field [0001] The invention relates to the technical field of geological exploration, in particular to a method for judging the type of zircon protorock by using zircon lattice damage. Background technique [0002] Zircon has stable physical and chemical properties and is rich in uranium and thorium radioactive elements, so it is an ideal object for U-Pb dating technology. Zircon is mainly formed in igneous rocks and metamorphic rocks, and can also occur in sedimentary rocks through weathering and denudation. Geologists usually use zircons to carry out U-Pb dating analysis to solve some geological science problems. Especially for detrital zircon in sedimentary rocks, it is often used to analyze and judge the source of zircon and construct the source-sink system of sedimentary sand bodies. With the development of science and technology, researchers have found that there are obvious errors in judging the provenance by using zircon U-Pb chronology, and U-Pb chronolog...
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