Sr isotopic chemostratigraphy of Precambrian carbonate rocks in the Amderma Rise, Pai-Khoi Ridge
- Авторы: Kuznetsov A.B.1, Starikova E.V.1, Maslov A.V.2, Konstantinova G.V.1
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Учреждения:
- Institute of Precambrian Geology and Geochronology
- Institute of Geology and Geochemistry, Ural Branch
- Выпуск: Том 469, № 2 (2016)
- Страницы: 777-781
- Раздел: Geology
- URL: https://ogarev-online.ru/1028-334X/article/view/188693
- DOI: https://doi.org/10.1134/S1028334X16080055
- ID: 188693
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Аннотация
The Sr and C isotopic compositions of Precambrian carbonate rocks are determined for Amderma Rise, in the northeastern margin of Pai-Khoi Ridge. Based on the Sr isotopic chemostratigraphy, it is established for the first time that the Amderma Formation is referred to the Early Vendian, while the Morozovsk Formation is Late Riphean in age. This conclusion along with detailed mapping proves that the Precambrian “section” of the Amderma Rise is a series of tectonic plates combined in a nonchronostratigraphic order. Volcanic and sedimentary rocks of the Morozovsk and Sokolninsk formations make up the allochthon proper, while carbonate rocks of the Amderma Formation make up the para-autochthon. The high values of δ13С (up to +9.5‰) identified in limestones of both formations suggest a considerable distance of the Pai-Khoi paleobasin from the passive margin of the Baltic Region upon facies similarity to the Laurentia active margins.
Об авторах
A. Kuznetsov
Institute of Precambrian Geology and Geochronology
Автор, ответственный за переписку.
Email: antonbor9@mail.ru
Россия, nab. Makarova 2, St. Petersburg, 199034
E. Starikova
Institute of Precambrian Geology and Geochronology
Email: antonbor9@mail.ru
Россия, nab. Makarova 2, St. Petersburg, 199034
A. Maslov
Institute of Geology and Geochemistry, Ural Branch
Email: antonbor9@mail.ru
Россия, ul. Vonsovskogo 15, Yekaterinburg, 620016
G. Konstantinova
Institute of Precambrian Geology and Geochronology
Email: antonbor9@mail.ru
Россия, nab. Makarova 2, St. Petersburg, 199034
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