| Abstract |
The paper presents new geological, geochronological, geochemical and Nd-Sr isotopic data on the Meso- Neoproterozoic dolerites of the Siberian Craton. New U-Pb baddeleyite and apatite ages of a E-W-trending dyke and two sills from southeastern Siberia are 982 ± 11, 977 ± 7, 970 ± 31 and 972 ± 60 Ma, respectively, extending the area of distribution of the event by more than 100 km to the north. The Sette-Daban intrusions are subalkalic mostly low-Ti dolerites, although high-Ti dolerites have been locally documented as well. Trace element abundances in dolerites vary from typical to E-MORB to OIB with arc-like signatures represented by high Th/Yb and low TiO2/Yb ratios. All dolerite samples display moderately positive εNd(t) values varying from +3.3 to +7.7 and indicating the magmas were derived from a depleted mantle source. E-MORB and OIB intrusions are attributed to the different degree of interaction of magma between the depleted asthenospheric mantle and regions within the sub-continental lithospheric mantle (SCLM) that were metasomatically enriched during earlier subduction events. Available data on Sette-Daban event distribution, composition and duration satisfy the characteristics of a typical Large Igneous Province (LIP). Similar age 1000–950 Ma mafic magmatism is also recognized in the Baltic and Amazonian cratons and can be potentially correlated with the Sette-Daban event. |
| Authors |
Aleksandr D. Savelev  , A. K. Khudoley , Sergey V. Malyshev , Kevin R. Chamberlain  , Richard E. Ernst , A. V. Prokopiev , A. V. Prokopiev , Ulf Söderlund , Ольга Юрьевна Лебедева , H. El Bilali , Artem N. Moskalenko
|
| Journal Info |
Taylor & Francis | International Geology Review , pages: 1 - 24
|
| Publication Date |
5/12/2024 |
| ISSN |
0020-6814 |
Type |
article |
| Open Access |
closed
|
| DOI |
https://doi.org/10.1080/00206814.2024.2349899 |
| Keywords |
Lithological Mapping (Score: 0.491339)
|
