Protracted metallogenic and magmatic evolution of the Kirazlı epithermal Au-Ag and porphyry Cu deposits, Biga Peninsula, NW Turkey: evidence from zircon U-Pb, muscovite 40Ar/39Ar, and molybdenite Re-Os geochronology

Article Article scientifique Article Protracted metallogenic and magmatic evolution of the Kirazlı epithermal Au-Ag and porphyry Cu deposits, Biga Peninsula, NW Turkey: evidence from zircon U-Pb, muscovite 40Ar/39Ar, and molybdenite Re-Os geochronology eng 2023-12-18 2023-12-18 author Aluc Ali 0000-0001-6766-8118 910794 author Kuşcu İlkay author Ulyanov Alexey 403348 author Selby David author Antoine Clémentine 916140 Services communs du département des sciences de la terre (DETCO) author Spikings Richard Alan 550467 Services communs du département des sciences de la terre (DETCO) author Moritz Robert 27897 Services communs du département des sciences de la terre (DETCO) 10.1007/s00126-023-01235-2 0026-4598 https://link.springer.com/10.1007/s00126-023-01235-2 The Kirazlı deposit is located at the center of the Biga Peninsula metallogenic province, in a geological setting characterized by an extensional tectonic environment. A NNW-SSE trending high-sulfidation (HS) orebody with a total reserve of 33.86 Mt @ 0.69 g/t Au and 9.42 g/t Ag lies beneath the Kirazlı Main zone. A porphyry Cu orebody hosted by Eocene intrusive and volcanic rocks has been intersected by drilling within its vicinity. The HS epithermal deposit is hosted by a partly silicified and brecciated Oligocene volcanic and volcaniclastic sequence consisting mainly of basaltic andesite lava flow and lithic/crystal tuff. Lithogeochemistry and zircon U-Pb radiometric ages allow us to distinguish three distinct high-K calc-alkaline magmatic events at ca. 41, 38, and 32 Ma, sourced by metasomatized mantle melts, which have interacted with the crust during their ascent. Porphyry Cu mineralization took place at 36.7 ± 0.4 Ma (muscovite 40 Ar/ 39 Ar age) with subsequent re-opening and base metal deposition. Crosscutting quartz-pyrite-molybdenite veins were emplaced at 33.6 ± 0.2 Ma (molybdenite Re-Os age), and followed by the HS epithermal Au-Ag event at ca. 31 Ma, based on a previous study. Our radiometric data indicate that the Kirazlı deposit has recorded a long-lasting Cenozoic magmatic and metallogenic evolution during about 10 Myr. Our study demonstrates that successive, independent, and overprinting, but genetically unrelated, HS epithermal precious metal, hydrothermal Mo, base metal, and porphyry Cu systems have been active at the same location during protracted extensional tectonics of the Biga Peninsula. High-sulfidation epithermal Porphyry Cu U-Pb – 40Ar/39Ar – Re-Os geochronology Kirazlı Biga Peninsula Dewey 550 42 Département des sciences de la Terre 154 false 692 Mineral Resources and Geofluids Mineralium deposita 9d2baaac-f2b3-41d2-a347-148641d61ba0 Article (Published version) Public Article-scientifique-from-crossref.pdf 15007100 application/pdf CC BY-4.0 27b994edc0a79bb2edf6016e3dcb155a8ca157685b8484310a22a6a105c9f5b0 openAccess Faculté des sciences / Section des sciences de la Terre et de l'Environnement / Département des sciences de la Terre

Title	Published in	Access level	OA Policy	Year	Views	Downloads

Protracted metallogenic and magmatic evolution of the Kirazlı epithermal Au-Ag and porphyry Cu deposits, Biga Peninsula, NW Turkey: evidence from zircon U-Pb, muscovite ⁴⁰Ar/³⁹Ar, and molybdenite Re-Os geochronology	Mineralium deposita			2023	90	42

Archive ouverte UNIGE

Ulyanov, Alexey