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

南伊比利亚地块的构造热演化：40 AR/39 AR 对地体增生的年龄控制

• 批准号: 8720322
• 负责人: R. David Dallmeyer
• 金额: $ 9.85万
• 依托单位: University of Georgia Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-03-01 至 1991-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8720322&HistoricalAwards=false
• 关键词: Tectonothermal; Evolution; Southern; Iberian; Massif

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.

伊比利亚地块是美洲板块最西南和最大的部分，似乎在早古生代从北美、波罗的海和冈瓦那分离出来，但在晚古生代参与了相当大的造山作用。已经提出了各种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析。西班牙地质调查局(IGME)最近进行的详细填图为这项研究提供了基础，这项研究涉及系统地测定伊比利亚地块南部五大岩石构造元素代表性区域内的40Ar/39Ar矿物和全岩千枚岩年龄。这些关于该地区构造热演化的数据将使人们能够对对比鲜明的板块构造模式进行更关键的分析，并有助于确定伊比利亚南部地区的奇异地体。