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Ulf Söderlund

Ulf Söderlund

Professor

Ulf Söderlund

980-970 Ma Sette-Daban event of the Siberian craton : new geochronological and geochemical data, relationship to LIP and potential connection with other LIPs

Author

  • Aleksandr D. Savelev
  • A. K. Khudoley
  • S. V. Malyshev
  • K. R. Chamberlain
  • R. E. Ernst
  • A. A. Pazukhina
  • A. V. Prokopiev
  • U. Söderlund
  • O. Yu Lebedeva
  • H. El Bilali
  • A. N. Moskalenko
Show all

Summary, in English

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.

Department/s

  • Lithosphere and Biosphere Science

Publishing year

2024

Language

English

Publication/Series

International Geology Review

Document type

Journal article

Publisher

Taylor & Francis

Topic

  • Geology

Keywords

  • geochemistry
  • large igneous province
  • meso-neoproterozoic
  • Sette-daban event
  • Siberian craton
  • U-Pb geochronology

Status

Epub

ISBN/ISSN/Other

  • ISSN: 0020-6814