Trans-Saharan Belt Provenance: A Potential Source for the Ordovician Succession of the Balkan Terrane (Svoge Unit) - Clues from LA-ICP-MS Detrital Zircon Dating Analysis

Authors

  • Stoyan Georgiev Geological Institute, Bulgarian Academy of Sciences
  • Valeri Sachanski Geological Institute, Bulgarian Academy of Sciences
  • Polina Andreeva Geological Institute, Bulgarian Academy of Sciences
  • Hristo Kiselinov Geological Institute, Bulgarian Academy of Sciences
  • Eleonora Balkanska Sofia University “St. Kliment Ohridski”
  • Iskra Lakova Geological Institute, Bulgarian Academy of Sciences
  • Stoyan Tanatsiev University of Mining and Geology “St. Ivan Rilski”

DOI:

https://doi.org/10.7546/CRABS.2022.02.09

Keywords:

detrital zircon, Ordovician, Trans-Saharan Belt provenance, Balkan Terrane, Svoge Unit, Bulgaria

Abstract

Two sandstone samples from the upper and lower part of the Ordovician succession of Svoge Unit were analyzed in order to determine their detrital zircon U–Pb age spectra using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). One sample was collected from the Hirnantian siliciclastic glaciomarine deposits of the Sirman Formation. The other sample is a
middle Darriwilian sandstone from the lower half of the Grohoten Formation. Additionally, micropetrographic studies were performed. They are composed predominantly of detrital monocrystalline quartz grains with uniform or rarely undulose extinction and only sporadically presented feldspar grains, muscovite flakes and single rock fragments. The heavy mineral assemblages are also characterized mostly by detrital zircon. As suggested from previous studies of the Hirnantian glaciomarine deposits of Sirman Formation, the provenance of siliciclastic material was most probably associated with sedimentary recycling of mature
sands deposited across the North Gondwana Platform. Multi-dimensional scaling statistical technique allowed a reliable objective identification of the potential source areas in Northern Africa and palaeogeographic reconstructions were made. Both samples are close to the Trans-Saharan Belt provenance, which is the most probable source for the detrital component. Our data support
the idea proposed by previous researchers that the present-day position of some of these terranes implies significant dextral strike-slip displacement, probably due to the movement on the Pangea megashear during the Carboniferous and Permian.

Author Biographies

Stoyan Georgiev, Geological Institute, Bulgarian Academy of Sciences

Geological Institute,
Bulgarian Academy of Sciences
Akad. G. Bonchev St, Bl. 24
1113 Sofia, Bulgaria

kantega@abv.bg

Valeri Sachanski, Geological Institute, Bulgarian Academy of Sciences

Geological Institute, Bulgarian Academy of Sciences
Akad. G. Bonchev St, Bl. 24
1113 Sofia, Bulgaria

v_sachanski@geology.bas.bg

University of Mining and Geology “St. Ivan Rilski”
Studentski Grad
Prof. Boyan Kamenov St
1700 Sofia, Bulgaria

valeri.sachanski@mgu.bg

Polina Andreeva, Geological Institute, Bulgarian Academy of Sciences

Geological Institute, Bulgarian Academy of Sciences
Akad. G. Bonchev St, Bl. 24
1113 Sofia, Bulgaria

polina_a@geology.bas.bg

Hristo Kiselinov, Geological Institute, Bulgarian Academy of Sciences

Geological Institute, Bulgarian Academy of Sciences
Akad. G. Bonchev St, Bl. 24
1113 Sofia, Bulgaria

hristo_bk@geology.bas.bg

Eleonora Balkanska, Sofia University “St. Kliment Ohridski”

Sofia University “St. Kliment Ohridski”
15 Tsar Osvoboditel Blvd
1504 Sofia, Bulgaria

balkanska@gea.uni-sofia.bg

Iskra Lakova, Geological Institute, Bulgarian Academy of Sciences

Geological Institute, Bulgarian Academy of Sciences
Akad. G. Bonchev St, Bl. 24
1113 Sofia, Bulgaria

lakova@geology.bas.bg

Stoyan Tanatsiev, University of Mining and Geology “St. Ivan Rilski”

University of Mining and Geology “St. Ivan Rilski”
Studentski Grad
Prof. Boyan Kamenov St
1700 Sofia, Bulgaria

stanatsiev@gmail.com

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Published

02-03-2022

How to Cite

[1]
S. Georgiev, “Trans-Saharan Belt Provenance: A Potential Source for the Ordovician Succession of the Balkan Terrane (Svoge Unit) - Clues from LA-ICP-MS Detrital Zircon Dating Analysis”, C. R. Acad. Bulg. Sci. , vol. 75, no. 2, pp. 237–247, Mar. 2022.

Issue

Section

Geology