Email this article Origin, sites and mobility of helium and argon isotopes in meliphanite
- Authors: Lyalina L.M.1, Kamensky I.L.1, Tolstikhin I.N.1
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Affiliations:
- Geological Institute, Kola Science Centre, Russian Academy of Sciences
- Issue: Vol 488, No 3 (2019)
- Pages: 303-306
- Section: Geochemistry
- URL: https://journals.eco-vector.com/0869-5652/article/view/16269
- DOI: https://doi.org/10.31857/S0869-56524883303-306
- ID: 16269
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Abstract
The similarity of U-Th-4He age of meliphanite and the age of regional metamorphism (1800 Ma) seems to indicate a good retention of radiogenic 4He in the mineral, but contradicts with the experience of U-Th-4He dating. To analyze this result 3He concentration was measured, which appeared to be very low, about 2 % of the totally produced 3He. Radiogenic 3,4He isotopes occupier radiation tracks. Intersections of these tracks with cleavage planes provide migration of He atoms from the mineral and 4He, produced due to U and Th decay, should be almost completely lost. Instead, meliphanite contains trapped He occurring in specific cavities of the crystalline structure. Extraction of He isotopes from meliphanite by its step-wise heating in vacuum confirmed this conclusion. Using U-Th-4He system for dating (as it is often done in thermochronology) can lead to incorrect results. Both isotopes, 3He and 4He, should be used to identify the origin of helium in minerals.
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About the authors
L. M. Lyalina
Geological Institute, Kola Science Centre, Russian Academy of Sciences
Author for correspondence.
Email: lialina@geoksc.apatity.ru
Russian Federation, 14, Fersmana street, Murmansk region, Apatity, 184209
I. L. Kamensky
Geological Institute, Kola Science Centre, Russian Academy of Sciences
Email: lialina@geoksc.apatity.ru
Russian Federation, 14, Fersmana street, Murmansk region, Apatity, 184209
I. N. Tolstikhin
Geological Institute, Kola Science Centre, Russian Academy of Sciences
Email: lialina@geoksc.apatity.ru
Russian Federation, 14, Fersmana street, Murmansk region, Apatity, 184209
References
- Burnard P.E. The Noble Gases as Geochemical Tracers. Heidelberg: Springer, 2013. 391 p.
- Sherlock S., Kelley S.P. Excess Argon Evolution in HP-LT Rocks: a UVLAMP Study of Phengite and K-Free Minerals, NW Turkey // Chem. Geol. 2002. V. 182. P. 619-636.
- Tolstikhin I., Waber H.N., Kamensky I., Loosli H.H., Skiba V., Gannibal M. Production, Redistribution and Loss of Helium and Argon Isotopes in a Thick Sedimentary Aquitard-Aquifer System (Molasse Basin, Switzerland) // Chem. Geol. 2011. V. 286. P. 48-58.
- Graham D.W. Noble Gas Isotope Geochemistry of Mid-Ocean Ridges and Ocean Island Basalts: Characterization of Mantle Source Reservoirs. In: Noble Gases in Geochemistry and Cosmochemistry. Wash.: Mineral. Soc. Amer., 2002. P. 247-318.
- Каменский И.Л., Скиба В.И. Определение генезиса декрепитирующих и недекрепитирующих микровключений в минералах горных пород путем изучения изотопов гелия и аргона // Геохимия. 2011. № 1. С. 50-58.
- Baxter E.F. Diffusion of Noble Gases in Minerals // Rev. Miner. Geochem. 2010. V. 72. P. 509-557.
- McDougall I., Harrison T.M. Geochronology and Thermochronology by the 40Ar/39Ar Method. 2-nd ed. Oxford: Oxford Univ. Press, 1999. 212 p.
- Trull T.W., Kurz M.D. Experimental Measurements of 3He and 4He Mobility in Olivine and Clinopyroxene at Magmatic Temperatures // Geochim. Cosmochim. Acta. 1993. V. 57. P. 1313-1324.
- Tolstikhin I., Kamensky I., Tarakanov S., Kramers J., Pekala M., Skiba V., Gannibal M., Novikov D. Noble Gas Isotope Sites and Mobility in Mafic Rocks and Olivine // Geochim. Cosmochim. Acta. 2010. V. 74. P. 1436-1447.
- Ветрин В.Р., Скублов С.Г., Балашов Ю.А., Лялина Л.М., Родионов Н.В. Время образования и генезис иттрий-циркониевого оруденения массива Сахарйок, Кольский полуостров // Записки РМО. 2014. № 2. С. 1-22.
- Горшков Г.В., Зябкин В.A., Лятковская Н.M., Цветков O.С. Естественный нейтронный фон атмосферы и земной коры. М.: Атомиздат, 1966. 410 с.
- Tolstikhin I.N., Lehmann B.E., Loosli H.H., Kamensky I.L., Nivin V.A., Orlov S.P., Ploschansky L.M., Tokarev I.V., Gannibal M.A. Radiogenic Helium Isotope Fractionation: The Role of Tritium as 3He Precursor: Geochemical Applications // Geochim. Cosmochim. Acta. 1999. V. 63. P. 1605-1611.
- Герлинг Е.К., Толстихин И.Н., Друбецкой Е.Р., Левковский Р.З., Шарков Е.В., Козаков Л.К. Изотопы гелия и аргона в породообразующих минералах // Геохимия. 1976. № 11. С. 1603-1611.
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