U-Pb zircon geochronology and phase equilibria modelling of HP-LT rocks in the Ossa-Morena Zone, Portugal.

ABSTRACT: The Ossa-Morena Zone (OMZ) has a complex geological history including both Cadomian and Variscan orogenic events. Therefore, the OMZ plays an important role in understanding the geodynamic evolution of Iberia. However, the P-T-t evolution of the OMZ is poorly documented. Here, we combine structural and metamorphic analyses with new geochronological data and geochemical analyses of mafic bodies in Ediacaran metasediments (in Iberia known as Série Negra) to constrain the geodynamic evolution of the OMZ. In the studied mafic rocks, two metamorphic stages were obtained by phase equilibria modelling: (1) a high-pressure/low-temperature event of 1.0 ± 0.1 GPa and 470-510 °C, and (2) a medium-pressure/higher-temperature event of 0.6 ± 0.2 GPa and 550-600 °C. The increase in metamorphic tem

SUBMITTER: Akker IV 

PROVIDER: S-EPMC7581627 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature