The volcanic rocks of the Kaban dacite, which is subject study, are located in Olur (Erzurum) region eastern Sakarya zone. This zone divided into four tectonic slices as Hopa-Borçka zone, Artvin Yusufeli Tortum and Erzurum Kars Ophiolite from north to south, east Eastern pontides, investigated within Olur-Tortum These represented by dacites rhyolites study area. Petrographically, it observed fi...

Plagioclase feldspars are key components of terrestrial planets and deriving their phase diagram activity–composition relations has been the subject many studies. Three main approaches have used for thermodynamic modelling behaviour plagioclase feldspars, all three disagree in terms magnitude relative importance mixing energies ordering energies. The present study uses Monte Carlo simulations b...

Abstract Background Three stages of basalt weathering are known: early or incipient weathering, intermediate and advanced weathering. The Late Oligocene Gebel Qatrani in Fayum Depression, Egypt, shows signs particularly exhibited spheroids found at the top flow. present paper gives results detailed petrographical, mineralogical geochemical study these spheroids. Results core-stones composed phe...