NEW DATA ON THE AGE OF MAGMATIC ROCKS OF THE ALPHA-MENDELEEV RISE (ARCTIC OCEAN): RESULTS OF ISOTOPIC U/Pb DATING OF ZIRCONS

S. G. Skolotnev; Сколотнев С. Г.; M. A. Fedonkin; Федонкин М. А.; A. V. Korniychuk; Корнийчук А. В.

doi:10.31857/S2686739723601503

NEW DATA ON THE AGE OF MAGMATIC ROCKS OF THE ALPHA-MENDELEEV RISE (ARCTIC OCEAN): RESULTS OF ISOTOPIC U/Pb DATING OF ZIRCONS

Authors: Skolotnev S.G.¹, Fedonkin M.A.¹, Korniychuk A.V.²
Affiliations:
1. Geological institute, Russian Academy of Sciences
2. International Agency for Technological Sustainability
Issue: Vol 513, No 1 (2023)
Pages: 26-32
Section: ГЕОЛОГИЯ
URL: https://journals.rcsi.science/2686-7397/article/view/232962
DOI: https://doi.org/10.31857/S2686739723601503
EDN: https://elibrary.ru/LJTCHR
ID: 232962

Cite item

Full Text

Open Access
Restricted Access

Access granted
Restricted Access

Subscription Access

Abstract
About the authors
References
Supplementary files
Statistics

Abstract

The age of magmatic rocks of the basic composition sampled at the Alpha-Mendeleev Rise in the Arctic Ocean with the help of a research submarine was studied, based on the measurement of the U/Pb age of zircons separated from them. Early Cretaceous rocks of the moderately alkaline series, formed at the turn of 112 million years, are most common on the Rise. These rocks contain a large number of ancient xenogenic zircons, the age analysis of which shows that the subalkaline melts interacted with the crust at two levels: with the horizon of Early Cretaceous sandstones and with rocks of the Late Archean crystalline basement with an age of 2675.1 ± 11.6 million years. They also contain a small number of younger zircons with an age of 83–87 million years, which probably arose during the recrystallization of Early Cretaceous zircons under the influence of Late Cretaceous magmatism.

Keywords

U/Pb age, zircons, magmatism, Alpha-Mendeleev Rise, Arctic Ocean

References

Морозов А.Ф., Петров О.В., Шокальский С.П. и др. Новые геологические данные, обосновывающие континентальную природу области Центрально-Арктических поднятий // Региональная геология и металлогения. 2013. № 53. С. 34–55.
Petrov O., Morozov A., Shokalsky S., et al. Crustal structure and tectonic model of the Arctic region // Earth-Sc. Rev. 2016. V. 154. P. 29–71.
Верниковский В.А., Морозов А.Ф., Петров О.В. и др. Новые данные о возрасте долеритов и базальтов поднятия Менделеева: к проблеме континентальной коры в Северном Ледовитом океане // ДАН. 2014. Т. 454. № 4. С. 431–435.
Jokat W., Ickrath M., O’Connor J. Seismic transect across the Lomonosov and Mendeleev Ridges: Constraints on the geological evolution of the Amerasia Basin, Arctic Ocean // Geoph. Res. Lett. 2013. V. 40. № 19. P. 5047–5051.
Williamson M., Kellett D., Miggins D., et al. Age and eruptive style of volcanic rocks dredged from the Alpha Ridge, Arctic Ocean // Geoph. Res. Abstracts. 2019. V. 21. EGU2019-6336.
Сколотнев С.Г., Федонкин М.А., Корнийчук А.В. Новые данные о геологическом строении юго-западной части поднятия Менделеева (Северный Ледовитый океан) // ДАН. 2017. Т. 476. №. 2. С. 190–196.
Skolotnev S., Aleksandrova G., Isakova T., et al. Fossils from seabed bedrocks: Implications for the nature of the acoustic basement of the Mendeleev Rise (Arctic Ocean) // Marine Geol. 2019. V. 407. P. 148–163.
Williams I.S. U–Th–Pb geochronology by ion microprobe / In: McKibben M.A., Shanks W.C., Ridely W.I. (eds) Applications of microanalytical techniques to understanding mineralizing processes // Rev. Econ. Geol. 1998. V. 7. P. 1–35.
Ireland T.R., Williams I.S. Considerations in zircon geochronology by SIMS / In: Hanchar J.M., Hoskin P.W. (eds) Zircon. Rev. Mineral. Geochem. Mineralogical Society of America Geochemical Society. Washington. DC. 2003. V. 53. P. 215–241.
Ludwig K.R. User’s Manual for Isoplot/Ex rev. 2.49: a geochronological toolkit for Microsoft Excel // Berkeley Geochronological Center Special Publication. 2001. № 1. 74 p.
Ludwig K.R. SQUID 1.02. A user’s manual // Berkeley Geochronological Center Special Publication. 2001. № 2. 47 p.
Mukasa S.B., Andronikov A., Mayer L.A., Brumley K. New geochemical and 40AR/39AR data for the first intraplate lavas recovered from the Arctic Ocean: bearing on the Amerasian Basin // Abstract. Penrose Conference. Tectonic Development of the Amerasia Basin. Banf. Canada. 2009. P. 4–9.
Brumley K. Geologic history of the Chukchi Borderland, Arctic Ocean / Stanford, California, Stanford University. Ph. D. Thesis, 2014. 242 p.
Tarduno J.A. The high Arctic large igneous province // Third International Conference on Arctic margins. Fed. Inst. Geosc. and Nat. Res. 1998. Extended Abstracts. P. 43–49.
Estrada S., Damaske D., Henjes-Kunst F., et al. Multistage Cretaceous magmatism in the northern coastal region of Ellesmere Island and its relation to the formation of Alpha Ridge – evidence from aeromagnetic, geochemical and geochronological data // Norwegian Journ. Geol. 2016. V. 96. № 2. P. 1–32.