Abstract Generally all orogenic ultrapotassic rocks are formed after melting of metasomatized sub-continental lithospheric mantle via subducted crustal mica-bearing lithologies. Here we present another possible model, based on the study small Stomanovo monzonite porphyry intrusion in Central Rhodope Massif, Bulgaria. The dated at 30.50 ± 0.46 Ma is intruded into voluminous Oligocene (31.63 0.40...

We provide the results of studying internal structure and composition rocks Semeitau Delbegetei massifs located in Eastern Kazakhstan. It was previously believed that these have different ages were formed geodynamic settings. The U-Pb zircon age from monzonites quartz determined to be 249 ± 2 Ma, which showed same Early Triassic massifs. Both are composed monzonite–granite series with a signifi...

The Matangkaka manganese deposit is an unusual Quaternary epithermal stratabound oxide from Ambitle Island in the Feni Group, New Ireland Province, Papua Guinea. a small volcanic island that has undergone explosive and effusive activity. Oldest rocks on consist of mafic–intermediate lavas epiclastic Pleistocene Volcano (Waramung Volcanics). These rest unconformably Oligocene calcilutites Basin....