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Mantle-derived spinel peridotite and spinel plagioclase pyroxenite xenoliths hosted in Cenozoic alkali basalts (20Ma) are found in the Xikeer area, western Tarim Block, NW China. Based on petrographic and geochemical characteristics, the peridotite xenoliths are divided into three groups. Group 1 peridotite xenoliths have experienced high degree melt extraction (~17% fractional melting) and weak,...
The Fanshan ultramafic–syenitic complex is located on the northern margin of North China Craton, with zircon U–Pb ages of 220Ma. It is a concentrically zoned complex, with syenite in the core, surrounded by ultramafic rocks (clinopyroxenite, glimmerite) and garnet-clinopyroxene syenite, respectively, towards the rim. Diopside, biotite, orthoclase, melanite, magnetite and apatite are the major minerals,...
The tectonic setting of the Eastern Pontides during the late Mesozoic to early Cenozoic remains a subject of debate. Petrogenesis of adakite-like granitoid porphyries plays a critical role in determining the nature of the lower continental crust and mantle dynamics during orogenic processes in the region. Here we describe, for the first time, the late Paleocene to early Eocene adakite-like granitoid...
Whole-rock geochemical and Sr, Nd and Pb isotope data are presented for a representative suite of the Quaternary Erzincan Volcanics (QEV) from the Erzincan basin (EB) along the North Anatolian Fault Zone, aiming to understand their origin and implications for basalt–lower crust interaction. Unspiked K–Ar and 40 Ar/ 39 Ar dating of dome lavas from the QEVs yielded ages of 102±2 to 1061±88 ka...
Whole-rock geochemistry, Sr–Nd–Pb isotopes and K–Ar data are reported for alkaline samples collected from the Neogene alkaline volcanics (NAVs) in the Eastern Pontides, northeastern Turkey, in order to investigate their source and petrogenesis and geodynamic evaluation of the region. The NAVs were made of three groups that comprise of basanite–tephrite (feldspar-free; Group A), tephrite–tephriphonolite...
The major and trace elements and Sr–Nd–Pb isotopes of the host rocks and the mafic microgranular enclaves (MME) gathered from the Dölek and Sariçiçek plutons, Eastern Turkey, were studied to understand the underlying petrogenesis and geodynamic setting. The plutons were emplaced at ∼43 Ma at shallow depths (∼5 to 9 km) as estimated from Al-in hornblende geobarometry. The host rocks consist of a variety...
Post-collisional magmatism in the Dabie Orogen is characterized by the near contemporaneous intrusion of voluminous granitoids and minor mafic magmas in the late Mesozoic (135-110 Ma). The granitoids are represented by three major batholiths in Northern Dabie: Zhubuyuan, Baimajian and Tiantangzhai. The largest Zhubuyuan Batholith comprises hornblende-bearing intermediate rocks (Penghe suite) and hornblende-free...
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