... Cretaceous dacitic to rhyolitic lava flows intercalated with mudstone, shale, and conglomerate ( Fig. 8 ; Giles, 1973 ; Taylor and Fryer, 1980 ). These rock units are crosscut by the composite calc-alkaline Early Cretaceous Ispir batholith, dated by K-Ar geochronology at 132 ± 5 Ma ( Giles, 1973...

... leads us to propose that the Lutetian or later nonadakitic granitic intrusions exposed at the north of the Gumushane-Bayburt-Ispir line were probably responsible for the epithermal gold mineralization in this belt. In thin section, the rock consists of mainly zoned plagioclase, amphibole, quartz...

... the possible geodynamic history of the Sakarya zone. Here, we investigated three representative plutons lying between the towns of Çamlıhemşin (Rize) and İspir (Erzurum), Turkey. These are largely composed of medium-K gabbroic diorites (Marselavat Pluton), shoshonitic monzonites (Güllübağ Pluton), and high-K...

... volcanosedimentary sequence, to the west by the intruding composite Late Cretaceous to Eocene Kaçkar batholith, and to the east by the thrusted Mesozoic fore-arc volcanosedimentary sequence ( Figs. 2 , 3 ). Our field observations show that the intermediate to felsic volcanic and volcaniclastic rocks and interbedded...

... zircon ages of the Eocene plutons from the eastern Sakarya Zone. 1-Bayburt: Kaygusuz et al. ( 2018 , 2020 ); 2-İspir: Dokuz et al. ( 2019 ); 3-Sisdağı: Karslı et al. ( 2012 ); 4-Bayburt: Eyüboğlu et al. ( 2017 ); 5-Çamlıhemşin: Dokuz et al. ( 2019 ); 6-Gümüşhane: Arslan & Aslan ( 2006 ); 7...

... by a regional NW-trending fault. Mineralization in both districts is hosted mainly by Lower Cretaceous plutons of the Coastal batholith that intrude sedimentary and volcanic sequences of the inverted Cañete basin. The deposits form part of a region that includes the much larger Marcona and Pampa del Pongo IOA...

... satisfactorily explained, but they may have been derived from the multi-phase intrusions of the S-type Donkerhuk batholith, lying to the north. The mine is currently being brought back into production. Underground development on the VT8-West section, reached via an inclined shaft, exposed a high-grade manto...