PALEOMAGNETISM OF THE MIOCENE VOLCANISM OF THE OAȘ – GUTÂI MOUNTAINS REVISITED (EASTERN CARPATHIANS, ROMANIA)

In this paper, we reanalyzed the previous paleomagnetic data from the Miocene magmatic rocks from the Oaș and Gutâi Mountains. The paleomagnetic sites were assigned to the correct ages according to the latest model of evolution of the Miocene volcanism in the Oaș and Gutâi Mountains. These new ages of the paleomagnetic sites indicate a good correlation of the stages of magmatic activity in the OGVZ with the Geomagnetic Polarity Time Scale. This correlation confirms that the paroxysm of the volcanic activity is reached during stage two of volcanic activity when the volcanism migrated toward north-east and reached the maximum spatial extension in around 1.3 Ma during Chron C5n (11.0-9.7 Ma). Based on the new age intervals assigned to the paleomagnetic data, we computed a badenian-Sarmatian paleomagnetic pole for the Gutâi Mountains (13.5-12 Ma) and a Pannonian paleomagnetic pole for the Oaș and Gutâi Mountains (11.7-9 Ma). We reconfirmed the counterclockwise vertical-axis rotation with respect to stable Eurasia of the southern Gutâi Mountains, but with a lower amplitude (-18.4° ± 14.5°). This fast vertical-axis rotation (around 1 Ma) is contemporaneous with the final stage of the clockwise rotation of the Apuseni Mountains and the Transylvanian Basin and the last tectonic movements along the Bogdan Vodă – Dragoș Vodă fault system.