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Natalia А. Rumyantseva
Natalia А. Rumyantseva
Engineer of the 1st Category
Academician I.S.Gramberg All-Russia Scientific Research Institute for Geology and Mineral Resources of the Ocean
Engineer of the 1st Category
Academician I.S.Gramberg All-Russia Scientific Research Institute for Geology and Mineral Resources of the Ocean
Saint Petersburg
Russia
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Articles

Geology
  • Date submitted
    2020-11-20
  • Date accepted
    2021-03-30
  • Date published
    2021-05-25

Petrochemical features of tholeiites from the Shaka ridge (South Atlantic)

The article presents original data of chemical composition of tholeiitic basaltoids and andesites, dredged from the Shaka Ridge (South Atlantic) in the course of field research in spring 2016 on the scientific expedition vessel “Akademik Fedorov”. The analytical part of the work on estimating the contents of petrogenic, trace and rare-earth elements was carried out using the classical method (“wet chemistry”), X-ray fluorescence analysis (XRF) and inductively coupled plasma mass spectrometry (ICP-MS). The studied samples demonstrate elevated concentrations of large-ion lithophile elements, or LILE, (Ba, Rb, Pb) and light rare earth elements, or LREE, (La, Ce, Nd, Sm) relative to high field strength elements, or HFSE, (Nb, Ta) and heavy rare earth elements, or HREE, (Dy, Yb, Lu). The specifics of trace element geochemistry suggest a significant contribution of crustal or subduction components to the magmas of the Shaka Ridge. Discrimination diagrams of basaltoids and allied rocks with fields of different geodynamic settings indicate that they were formed in the setting of the mid-ocean ridge basalt (MORB). The reason behind the appearance of subduction and crustal marks in the rocks is possibly associated with assimilation of crustal matter by magmas or lies in their inheritance from the mantle source.

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Natalia А. Rumyantseva, Boris G. Vanshteyn, Sergey G. Skublov (2021) Petrochemical features of tholeiites from the Shaka ridge (South Atlantic). Journal of Mining Institute. Vol 248. p. 223-231. DOI: 10.31897/PMI.2021.2.6