Comparison of isotope data obtained with Sm-Nd and Re-Os methods for minerals and rocks from the Ozernoe ore occurrence, Salla-Kuolajarvi belt
Sm-Nd isochrone, drawn for rock-forming and sulfide minerals from the Ozernoe ore occurrence, indicates albitite age of 1,759 ± 11 Ma. It shows synchronous formation of albitite and sulfide mineralization, and fully corresponds to the earlier defined age of rutile in albitite (1,757 ± 7 Ma U-Pb, n =...
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ftoceandocs:oai:aquadocs.org:1834/41649 2023-05-15T17:00:27+02:00 Comparison of isotope data obtained with Sm-Nd and Re-Os methods for minerals and rocks from the Ozernoe ore occurrence, Salla-Kuolajarvi belt Сравнение изотопных данных, полученных Sm-Nd и Re-Os методами для минералов и пород рудопроявления Озерное Салла-Куолаярвинской зоны Kalinin, A. A. Kaulina, T. V. Serov, P. A. Russia Norway Finland Sweden Republic of Karelia Россия Норвегия Финляндия Швеция Республика Карелия 2021 pp.5-13 http://hdl.handle.net/1834/41649 ru rus http://vestnik.mstu.edu.ru/show-eng.shtml?art=2084 http://vestnik.mstu.edu.ru/show.shtml?art=2084 http://hdl.handle.net/1834/41649 Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ Salla-Kuolajarvi belt Albitite Sm-Nd method Rb-Sr method Re-Os method Салла-Куолаярвинская зона Альбититы Sm-Nd метод Rb-Sr метод Re-Os метод ASFA_2015::G::Geology ASFA_2015::G::Geophysics ASFA_2015::R::Rhenium Journal Contribution 2021 ftoceandocs 2023-04-06T17:07:02Z Sm-Nd isochrone, drawn for rock-forming and sulfide minerals from the Ozernoe ore occurrence, indicates albitite age of 1,759 ± 11 Ma. It shows synchronous formation of albitite and sulfide mineralization, and fully corresponds to the earlier defined age of rutile in albitite (1,757 ± 7 Ma U-Pb, n = 3, MSWD = 0.2), and Rb-Sr isochrone age 1,754 ± 39 Ma for biotite, apatite, albite, and WR. Recently published Re-Os ages of molybdenite 1,872 ± 23 Ma and chalcopyrite 1,891 ± 230 Ma indicate more ancient age of sulfide mineralization. These figures are in conflict with the age of rock-forming minerals, defined with Sm-Nd and Rb-Sr methods. The possibility of use of molybdenite from the Salla-Kuolajarvi belt for rock dating has been considered, and low reliability of Re-Os method for it has been shown. The reasons are the following: 1) extremely uneven distribution of Re in molybdenite, where Re content varies 1 wt.% even within one and the same grain, and 2) openness of the Re-Os system after molybdenite crystallization, Re is mobylized and partly removed from the mineral in the zone of hypergenesis. Removal of Re from molybdenite promotes erroneous ancient age of the molybdenite. According to the equations of radioactive decay, the age would be 110–130 Ma bigger if 5–6 % of Re is taken away. The conclusion is that molybdenite must be studied in detail, proved to be homogenous and unaltered, before it is used for Re-Os dating. In the other case the results will be not reliable. Sm-Nd изохрона, построенная по породообразующим и сульфидным минералам рудопроявления Озерного, определяет возраст альбититов Салла-Куолаярвинской зоны 1 759±11 млн лет. Это говорит о синхронности образования альбититов и сульфидной минерализации в них и хорошо согласуется с полученными ранее значениями – U-Pb возрастом рутила 1 757 ± 7 млн лет (n = 3, СКВО = 0,2), и Rb-Sr изохроной 1 754 ± 39 млн лет по биотиту, апатиту, альбиту и породе в целом. В то же время опубликованные по рудопроявлению Озерному данные Re-Os датирования молибденита 1 ... Other Non-Article Part of Journal/Newspaper karelia* karelia* Republic of Karelia IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications Norway Salla ENVELOPE(28.667,28.667,66.833,66.833) |
institution |
Open Polar |
collection |
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications |
op_collection_id |
ftoceandocs |
language |
Russian |
topic |
Salla-Kuolajarvi belt Albitite Sm-Nd method Rb-Sr method Re-Os method Салла-Куолаярвинская зона Альбититы Sm-Nd метод Rb-Sr метод Re-Os метод ASFA_2015::G::Geology ASFA_2015::G::Geophysics ASFA_2015::R::Rhenium |
spellingShingle |
Salla-Kuolajarvi belt Albitite Sm-Nd method Rb-Sr method Re-Os method Салла-Куолаярвинская зона Альбититы Sm-Nd метод Rb-Sr метод Re-Os метод ASFA_2015::G::Geology ASFA_2015::G::Geophysics ASFA_2015::R::Rhenium Kalinin, A. A. Kaulina, T. V. Serov, P. A. Comparison of isotope data obtained with Sm-Nd and Re-Os methods for minerals and rocks from the Ozernoe ore occurrence, Salla-Kuolajarvi belt |
topic_facet |
Salla-Kuolajarvi belt Albitite Sm-Nd method Rb-Sr method Re-Os method Салла-Куолаярвинская зона Альбититы Sm-Nd метод Rb-Sr метод Re-Os метод ASFA_2015::G::Geology ASFA_2015::G::Geophysics ASFA_2015::R::Rhenium |
description |
Sm-Nd isochrone, drawn for rock-forming and sulfide minerals from the Ozernoe ore occurrence, indicates albitite age of 1,759 ± 11 Ma. It shows synchronous formation of albitite and sulfide mineralization, and fully corresponds to the earlier defined age of rutile in albitite (1,757 ± 7 Ma U-Pb, n = 3, MSWD = 0.2), and Rb-Sr isochrone age 1,754 ± 39 Ma for biotite, apatite, albite, and WR. Recently published Re-Os ages of molybdenite 1,872 ± 23 Ma and chalcopyrite 1,891 ± 230 Ma indicate more ancient age of sulfide mineralization. These figures are in conflict with the age of rock-forming minerals, defined with Sm-Nd and Rb-Sr methods. The possibility of use of molybdenite from the Salla-Kuolajarvi belt for rock dating has been considered, and low reliability of Re-Os method for it has been shown. The reasons are the following: 1) extremely uneven distribution of Re in molybdenite, where Re content varies 1 wt.% even within one and the same grain, and 2) openness of the Re-Os system after molybdenite crystallization, Re is mobylized and partly removed from the mineral in the zone of hypergenesis. Removal of Re from molybdenite promotes erroneous ancient age of the molybdenite. According to the equations of radioactive decay, the age would be 110–130 Ma bigger if 5–6 % of Re is taken away. The conclusion is that molybdenite must be studied in detail, proved to be homogenous and unaltered, before it is used for Re-Os dating. In the other case the results will be not reliable. Sm-Nd изохрона, построенная по породообразующим и сульфидным минералам рудопроявления Озерного, определяет возраст альбититов Салла-Куолаярвинской зоны 1 759±11 млн лет. Это говорит о синхронности образования альбититов и сульфидной минерализации в них и хорошо согласуется с полученными ранее значениями – U-Pb возрастом рутила 1 757 ± 7 млн лет (n = 3, СКВО = 0,2), и Rb-Sr изохроной 1 754 ± 39 млн лет по биотиту, апатиту, альбиту и породе в целом. В то же время опубликованные по рудопроявлению Озерному данные Re-Os датирования молибденита 1 ... |
format |
Other Non-Article Part of Journal/Newspaper |
author |
Kalinin, A. A. Kaulina, T. V. Serov, P. A. |
author_facet |
Kalinin, A. A. Kaulina, T. V. Serov, P. A. |
author_sort |
Kalinin, A. A. |
title |
Comparison of isotope data obtained with Sm-Nd and Re-Os methods for minerals and rocks from the Ozernoe ore occurrence, Salla-Kuolajarvi belt |
title_short |
Comparison of isotope data obtained with Sm-Nd and Re-Os methods for minerals and rocks from the Ozernoe ore occurrence, Salla-Kuolajarvi belt |
title_full |
Comparison of isotope data obtained with Sm-Nd and Re-Os methods for minerals and rocks from the Ozernoe ore occurrence, Salla-Kuolajarvi belt |
title_fullStr |
Comparison of isotope data obtained with Sm-Nd and Re-Os methods for minerals and rocks from the Ozernoe ore occurrence, Salla-Kuolajarvi belt |
title_full_unstemmed |
Comparison of isotope data obtained with Sm-Nd and Re-Os methods for minerals and rocks from the Ozernoe ore occurrence, Salla-Kuolajarvi belt |
title_sort |
comparison of isotope data obtained with sm-nd and re-os methods for minerals and rocks from the ozernoe ore occurrence, salla-kuolajarvi belt |
publishDate |
2021 |
url |
http://hdl.handle.net/1834/41649 |
op_coverage |
Russia Norway Finland Sweden Republic of Karelia Россия Норвегия Финляндия Швеция Республика Карелия |
long_lat |
ENVELOPE(28.667,28.667,66.833,66.833) |
geographic |
Norway Salla |
geographic_facet |
Norway Salla |
genre |
karelia* karelia* Republic of Karelia |
genre_facet |
karelia* karelia* Republic of Karelia |
op_relation |
http://vestnik.mstu.edu.ru/show-eng.shtml?art=2084 http://vestnik.mstu.edu.ru/show.shtml?art=2084 http://hdl.handle.net/1834/41649 |
op_rights |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ |
_version_ |
1766053124505600000 |