Tectonothermal Evolution of the Southern Iberian Massif: 40 AR/39 AR Age Controls on Terrane Accretion

伊比利亚地块是美洲板块最西南、最大的一块，在古生代早期与北美、波罗的海和冈瓦纳大陆分离，但在古生代后期参与了相当大的造山运动。人们提出了各种各样的板块构造模型和大陆重建，然而，对关键的美洲板块的了解阻碍了对这些板块构造历史的解决。西班牙地质调查局（IGME）最近进行的详细测绘为这项研究提供了基础，该研究包括系统地确定构成伊比利亚地块南部的五个主要岩石构造元素的代表性区域内的40 Ar/39 Ar矿物和全岩千层岩年龄。这些关于该地区构造热演化的数据将允许对对比的板块构造模型进行更严格的分析，并有助于确定伊比利亚南部的奇异地体。

The Iberian Massif constitutes the southwestern most and largest fragment of the Amorican Plate, which appears to have been separated from North America, Baltica and Gondwana during the early Paleozoic, but was involved in considerable orogenesis during later Paleozoic time. A variety of plate tectonic models and continental reconstructions have been proposed, however knowledge of the critical Amorican plate has prevented resolution of the tectonic history of these plates. Recent detailed mapping carried out by the Spanish Geologic Survey (IGME) provides the basis for this research which involves systematic determination of 40 Ar/39 Ar mineral and whole-rock phyllite ages within representative areas of the five major lithotectonic elements which comprise southern portions of the Iberian Massif. These data on the tectonothermal evolution of this area would permit a more critical analysis of the contrasting plate tectonic models and aid in definition of exotic terranes within southern Iberia.