In situ Rb-Sr dating of the Gönen granitoid in the western Sakarya Zone, NW Anatolia: Implications for the Late Carboniferous magmatic events and tectonic setting

Iranian Journal of Earth Sciences

مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 01 آبان 1402

نوع مقاله: Original Research Paper

شناسه دیجیتال (DOI): 10.57647/j.ijes.2024.1604.19

نویسنده

FIRAT ŞENGUN^*

Canakkale Onsekiz Mart University, Can Vocational School, Mining and Mineral Extraction Department, Can-Canakkale, Turkey

چکیده

Granitoids with ages ranging from Paleozoic to Tertiary are widely distributed in the western Sakarya Zone. The Gönen granitoid is one of these Paleozoic (Early Carboniferous) granitoids and exposed on western side of the Sakarya Zone in NW Anatolia. The Jurassic Bayırköy Formation consisting of conglomerate, sandstone, siltstone, and claystone intercalation unconformably overlies the Gönen granitoid. Yellowish brown-colored, medium to coarse-grained Gönen granitoid mainly made up of K-feldspar, plagioclase, muscovite, quartz, and biotite. In this paper, it is presented in situ Rb-Sr isochron ages for the Gönen granitoid in western Sakarya Zone. The isochron derived from muscovite and plagioclase minerals occurring in the granitoid yielded 299.3 ± 3.4 Ma (Late Carboniferous), which is interpreted as the cooling age of the Gönen 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 (0.7074 ± 0.0057), the magma producing the Gönen 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 Paleo-Tethys oceanic crust along the southern margin of Laurasia in the Early-Late Carboniferous.

کلیدواژه‌ها

Muscovite؛ in situ Rb-Sr dating؛ granitoid؛ Sakarya Zone؛ NW Anatolia