Abstract
Field characteristics indicate that the Badajoz-Cordóba shear zone has had a long, polyphase tectonothermal evolution. 40Ar/ 39Ar cooling ages recorded within central, ductile sectors of the Badajoz-Cordóba shear zone range from ca. 370 to 360 Ma (amphibole) and 340 to 330 Ma (muscovite). These are interpreted to date post-metamorphic cooling through contrasting temperatures required for intracrystalline retention of argon following a regionally significant Variscan tectonothermal overprint. These results combined with field relationships indicate that the Badajoz-Cordóba shear zone experienced at least 15 km of uplift relative to adjacent areas during late Paleozoic sinistral transpression. The data also indicate that individual structural units within the shear zone experienced contrasting uplift histories (both in total amount and rate). The 40Ar/ 39Ar cooling ages indicate complete Variscan rejuvenation of all older intracrystalline argon systems within central sectors of the Badajoz-Cordóba shear zone.
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