Geochronological and isotopic data from the adakitic Dodurga Pluton (Central Pontides, N Türkiye): new insights for the geodynamic evolution of the northern Neotethys

Authors

OKAY ÇİMENFollow
MEHMET ALİ GÜCERFollow
ANTONIO SIMONETTIFollow
FATİH KARAOĞLANFollow

Abstract

The Dodurga Pluton is located within the Central Pontides (northern Türkiye) and, has a SW-NE elongation, and consists of granodiorite and dacite porphyry. Previous studies have suggested that this pluton is Triassic in age, and its whole-rock geochemical systematics are consistent with those from adakitic magmatic occurrences rather than the classic arc granitoid suite. This study reports the first time in-situ/whole-rock radiogenic isotopic (Sr, Nd and Pb) and mica/amphibole Ar-Ar age data to evaluate better its petrogenetic-geodynamic evolution and chemical nature of mantle source(s). Unlike previous data, combined new in-situ zircon U-Pb yield Late Cretaceous crystallization ages of 84.2±0.9 Ma and 86.9±0.9 Ma, and Ar-Ar age data along with apatite fission track measurements suggest magma cooling extending to 82.3±0.4 Ma and 85.4±0.4 Ma, respectively. The apatite fission track (AFT) dating results also reveal that this pluton was buried at a depth of 2.5-3 km following a fast-cooling period during Late Cretaceous and cooled/exhumed over ~2 km during the Middle-Late Miocene (15-10 Ma) in a slow cooling phase. The overall data reported here suggest that the Dodurga Pluton represents melts derived from an enriched/metasomatized mantle source that interacted with lower crustal mafic rocks in an active continental margin as a result of northward subduction of the northern branch of the Neotethys Ocean.

Author ORCID Identifier

OKAY ÇİMEN: 0000-0002-1727-9939

MEHMET ALİ GÜCER: 0000-0002-9075-3350

ANTONIO SIMONETTI: 0000-0002-4025-2283

FATİH KARAOĞLAN: 0000-0002-0038-6631

DOI

10.55730/1300-0985.1943

Keywords

Adakitic magmatism, crustal contamination and assimilation, radiogenic isotope systematics, radiometric dating, northern Neotethys Ocean

First Page

1

Last Page

22

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Recommended Citation

ÇİMEN, OKAY; GÜCER, MEHMET ALİ; SIMONETTI, ANTONIO; and KARAOĞLAN, FATİH (2025) "Geochronological and isotopic data from the adakitic Dodurga Pluton (Central Pontides, N Türkiye): new insights for the geodynamic evolution of the northern Neotethys," Turkish Journal of Earth Sciences: Vol. 34: No. 1, Article 2. https://doi.org/10.55730/1300-0985.1943
Available at: https://journals.tubitak.gov.tr/earth/vol34/iss1/2