{"title":"月球锆石的电子微探针测年","authors":"Changkun Park, Hwayoung Kim","doi":"10.1186/s40543-024-00431-7","DOIUrl":null,"url":null,"abstract":"Zirconolite is an accessary mineral occurred in the lunar basaltic and granitic rocks and contains relatively high contents of U, Th, and Pb, which is attractive for age dating. However, very few studies have reported the crystallization ages of lunar zirconolites because of the challenge of dating lunar zirconolites due to their fine-grained size and irregular shape. In this study, we analyzed zirconolites in a granitic clast of the lunar meteorite DEW 12007 using an electron microprobe. MAN (mean atomic number) background, peak interference, and blank corrections were applied to 31 elements including U, Th, and Pb, and REEs, to obtain high-precision and high-accuracy chemical data of the zirconolites. The electron microprobe age of the zirconolites is determined to be 4332 ± 14 Ma (2σ, n = 20), which is consistent with the U–Pb age (4340.9 ± 7.5 Ma; 2σ) of zircon grains from the same clast measured by an ion microprobe. The precision and accuracy achieved in this study represents a notable advance compared to previously reported electron microprobe ages of lunar zirconolites. This suggests that electron microprobe dating may be applicable to extraterrestrial materials, especially for microscopic U-Th-Pb-containing minerals in the samples returned from the Moon and Mars.","PeriodicalId":14967,"journal":{"name":"Journal of Analytical Science and Technology","volume":"35 1","pages":""},"PeriodicalIF":2.5000,"publicationDate":"2024-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Electron microprobe dating of lunar zirconolite\",\"authors\":\"Changkun Park, Hwayoung Kim\",\"doi\":\"10.1186/s40543-024-00431-7\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Zirconolite is an accessary mineral occurred in the lunar basaltic and granitic rocks and contains relatively high contents of U, Th, and Pb, which is attractive for age dating. However, very few studies have reported the crystallization ages of lunar zirconolites because of the challenge of dating lunar zirconolites due to their fine-grained size and irregular shape. In this study, we analyzed zirconolites in a granitic clast of the lunar meteorite DEW 12007 using an electron microprobe. MAN (mean atomic number) background, peak interference, and blank corrections were applied to 31 elements including U, Th, and Pb, and REEs, to obtain high-precision and high-accuracy chemical data of the zirconolites. The electron microprobe age of the zirconolites is determined to be 4332 ± 14 Ma (2σ, n = 20), which is consistent with the U–Pb age (4340.9 ± 7.5 Ma; 2σ) of zircon grains from the same clast measured by an ion microprobe. The precision and accuracy achieved in this study represents a notable advance compared to previously reported electron microprobe ages of lunar zirconolites. This suggests that electron microprobe dating may be applicable to extraterrestrial materials, especially for microscopic U-Th-Pb-containing minerals in the samples returned from the Moon and Mars.\",\"PeriodicalId\":14967,\"journal\":{\"name\":\"Journal of Analytical Science and Technology\",\"volume\":\"35 1\",\"pages\":\"\"},\"PeriodicalIF\":2.5000,\"publicationDate\":\"2024-03-29\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Analytical Science and Technology\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://doi.org/10.1186/s40543-024-00431-7\",\"RegionNum\":4,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"CHEMISTRY, ANALYTICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Analytical Science and Technology","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1186/s40543-024-00431-7","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, ANALYTICAL","Score":null,"Total":0}
Zirconolite is an accessary mineral occurred in the lunar basaltic and granitic rocks and contains relatively high contents of U, Th, and Pb, which is attractive for age dating. However, very few studies have reported the crystallization ages of lunar zirconolites because of the challenge of dating lunar zirconolites due to their fine-grained size and irregular shape. In this study, we analyzed zirconolites in a granitic clast of the lunar meteorite DEW 12007 using an electron microprobe. MAN (mean atomic number) background, peak interference, and blank corrections were applied to 31 elements including U, Th, and Pb, and REEs, to obtain high-precision and high-accuracy chemical data of the zirconolites. The electron microprobe age of the zirconolites is determined to be 4332 ± 14 Ma (2σ, n = 20), which is consistent with the U–Pb age (4340.9 ± 7.5 Ma; 2σ) of zircon grains from the same clast measured by an ion microprobe. The precision and accuracy achieved in this study represents a notable advance compared to previously reported electron microprobe ages of lunar zirconolites. This suggests that electron microprobe dating may be applicable to extraterrestrial materials, especially for microscopic U-Th-Pb-containing minerals in the samples returned from the Moon and Mars.
期刊介绍:
The Journal of Analytical Science and Technology (JAST) is a fully open access peer-reviewed scientific journal published under the brand SpringerOpen. JAST was launched by Korea Basic Science Institute in 2010. JAST publishes original research and review articles on all aspects of analytical principles, techniques, methods, procedures, and equipment. JAST’s vision is to be an internationally influential and widely read analytical science journal. Our mission is to inform and stimulate researchers to make significant professional achievements in science. We aim to provide scientists, researchers, and students worldwide with unlimited access to the latest advances of the analytical sciences.