10.57647/j.ijes.2024.1604.19

In situ Rb-Sr dating of K-bearing minerals in the Gonen granitoid from the western Sakarya Zone, NW Anatolia

  1. Department of Mining and Mineral Extraction, Can Vocational College, Canakkale Onsekiz Mart University, Can- Canakkale, Turkey
  2. 2. Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden
In situ Rb-Sr dating of K-bearing minerals in the G¨onen granitoid from the western Sakarya Zone, NW Anatolia

Received: 2023-09-23

Revised: 2023-11-08

Accepted: 2023-12-27

Published in Issue 2024-11-04

How to Cite

Sengun, F. (2024). In situ Rb-Sr dating of K-bearing minerals in the Gonen granitoid from the western Sakarya Zone, NW Anatolia. Iranian Journal of Earth Sciences, 16(4), 1-9. https://doi.org/10.57647/j.ijes.2024.1604.19

PDF views: 241

Abstract

Granitoids with ages ranging from Paleozoic to Tertiary are widely distributed in the western
Sakarya Zone. The Gonen granitoid is one of these Paleozoic (Early Carboniferous) granitoids
and exposed on the western part of the Sakarya Zone in NW Anatolia. The Gonen granitoid is
unconformably overlain by the Jurassic Bayırkoy Formation consisting of conglomerate, sandstone,
siltstone, and claystone intercalation. Medium to coarse-grained, yellowish brown-colored Gonen
granitoid chiefly made up of K-feldspar, plagioclase, muscovite, quartz, and biotite. In this
paper, it is presented in situ Rb-Sr isochron ages for the Gonen granitoid in the western Sakarya
Zone. The isochron derived from muscovite and plagiocalse minerals occurring in the granitoid
yielded 299.3 ± 3.4 Ma (Late Carboniferous), which is interpreted as the emplacement age of
the Gonen granitoid. This study also testifies that radiometric in situ Rb-Sr dating can be applied
to resolve absolute dating of magmatic complexes. According to the initial 87Sr/86Sr ratio, the
magma producing the Gonen granitoid was derived from the enriched subcontinental lithospheric
mantle forming the ancient crust. The Carboniferous magmatic event can be attributed to the
northward subduction of the Palae-Tethys oceanic crust along the southern margin of Laurasia in
the Early-Late Carboniferous.

Keywords

  • K-bearing minerals,
  • In situ Rb-Sr,
  • Granitoid,
  • Sakarya Zone,
  • Nw Anatolia

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