Bu çalışmada, Keban-Elazığ bölgesindeki Geç Kretase-Orta Eosen yaşlı Keban Magmatik kayaçlarının petrografik ve jeokimyasal özellikleri incelenmiştir. Çalışılan bölgede Keban Magmatik Kayaçları dışında Geç Devoniyen-Geç Triyas yaşlı Keban Metamorfitleri, Paleosen-Neojen sedimanter birimleri ve Plio-Kuvaterner yaşlı alüvyonlar yüzeylemektedir. Çalışmanın konusunu oluşturan kayaçlar Keban metamorfik kayaçlarını kesen Keban Magmatik kayaçlarına ait siyenit ve kuvars-monzonitlerle temsil edilmektedir. İncelenen kayaçlar genel olarak porfirik, porfirik holokristalen, poiklitik doku özelliği gösteren K-feldispat (mega-fenokristal), plajiyoklas, amfibol, biyotit ve kuvars mineralleri ana mineral içeriğini oluşturur. İncelenen tüm örnekler şoşonitik karakterli olup A-tipi granitoid alanlarına düşmektedir. İncelenen kayaçların tektonik ortamı olarak çarpışma sonrası granitleri bölgesi önerilmektedir.

The Guleman ophiolite, one of the most important ophiolitic massifs of the Southeast Anatolian Ophiolitic Belt, consists of a core of serpentinized mantle rocks overlain by an ultramafic sequence, layered and isotropic gabbro, and sheeted dykes. The ophiolite structurally overlies the Lower Miocene Lice Formation and is overlain by young sandstones and shales of the Upper Maashtrichtian‐Lower Eocene Hazar Complex and Middle Eocene Maden Complex. The Guleman ophiolite tectonically overlain by Precambrian to Upper Triassic Bitlis metamorphic massif. The mantle peridotites compose mainly of fresh and in place serpentinized harzburgite tectonite with local bands and lenses of dunites with large‐sized chromitite pods. The Guleman peridotites commonly show porphyroclastic texture, high‐temperature fabrics such as kink‐bands in olivines. According to microprobe analyses, the harzburgite and dunite have low CaO and Al₂O₃ abundance similar to Mariana forearc, and their average Cr‐ (=Cr/(Cr+Al) atomic) ratio of Cr‐spinelsis surprisingly high (>0.63) besides Fo content of olivine is between 90.9 to 92.3 in peridotites. According to Mg^# (Mg/(Mg+Fe²⁺)) versus Cr^# in spinel diagram, the degree of partial melting is higher than 35% and spinel values plot in the forearc peridotites field. The Gulemanharzburgites have low CaO, Al₂O₃ and TiO₂ contents in orthopyroxene and clinopyroxene lammelles, resembling those of depleted harzburgites from modern forearcs and different from moderately depleted abyssal peridotites. Consequently, we propose that the Guleman peridotites form in a forearc setting during the subduction initiation that developed as a result of northward subduction of the southern branch of the Neo‐Tethys in response to the convergence between Arabian and Anatolian plates.

Late Cretaceous plutonic rocks are commonly observed along the Southeastern Anatolian Orogenic Belt (SAOB), which constitutes a significant part of the Alpine–Himalayan Orogenic Belt. Here, we present new whole-rock geochemical analyses, zircon U–Pb ages, and zircon trace element data of plutonic rocks located in the SAOB (eastern Türkiye). This study aims to determine the petrogenesis of the studied plutonic rocks in light of new data and to contribute to the tectonic evolution of the SAOB. Geochemical data demonstrate that the studied granodiorites, diorites, and gabbros are tholeiitic–calc–alkaline in composition, metaluminous, and I-type granite. Zircon U-Pb ages yielded crystallisation ages of 73.52 ± 0.24 Ma for the studied granodiorites and 78.86 ± 0.39 Ma for the diorites. These age data indicate that the studied plutonic rocks represent the youngest granodiorite and diorite formations observed around the study area. High Th/U ratios (granodiorite: 0.15–0.29; diorite: 0.31–0.96) and positive Ce/Ce* (granodiorite: 8.11 to 609.86; diorite: 58.07 to 564.31) and negative Eu/Eu* (granodiorite: 0.49 to 0.62; diorite: 0.59–0.97) values obtained in zircon grains suggest that they are of magmatic origin. Geochemical data indicate that the studied diorites and gabbros originate from a spinel-bearing source representing shallow depths. In light of all the data, the studied plutonic rocks are products of arc magmatism resulting from the subduction of the NeoTethys Oceanic lithosphere along the SAOB.

Pegmatitic gabbros belonging to the Koçali ophiolite, located within the southern belt ophiolites, are situated in the Southeastern Anatolia region. In this study, whole-rock geochemistry analyses were performed on pegmatitic gabbros of the Koçali ophiolite. This study aims to contribute to the petrogenesis of pegmatitic gabbros and the tectonic evolution of the Southeastern Anatolian Orogenic Belt by evaluating new data alongside previous studies. Geochemical data demonstrate that the studied rocks are tholeiitic and mostly boninitic. Pegmatitic gabbros exhibit spoon-shaped REE patterns with high MgO content and low TiO2 values. However, low Ti/V values support a boninitic magma origin. The high Ba/La and Ba/Th ratios of the pegmatitic gabbros show a high-pressure, low-temperature, and fluid-rich environment consistent with a forearc setting. KG-1 sample indicates a boninitic magma origin with positive ƐNd(t) (+2.9) and high 87Sr86Sr values (0.706666). KG-8 sample, in contrast, shows relatively enriched characteristics and an E-MORB-like affinity. When all data are evaluated together, it has been determined that the pegmatitic gabbros formed mainly from a boninitic magma source in the forearc environment of the supra-subduction zone.