The geodynamic evolution of Cuba and its role in the Caribbean puzzle

古巴的地球动力学演化及其在加勒比拼图中的作用

• 批准号: 5396570
• 负责人: Professor Dr. Martin Meschede
• 金额: --
• 依托单位: Geological Institute of the University of Pinar del Rio (aufgelöst)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2003
• 资助国家: 德国
• 起止时间: 2002-12-31 至 2007-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5396570?language=en
• 关键词: geodynamic; evolution; Cuba; its; role

Mesozoic rocks of Cuba play a key role for any attempt to reconstruct the geodynamic history of the Caribbean and the Gulf of Mexico area. Cuba has been part of the Caribbean plate during the Mesozoic and was accreted to the North American plate during Paleocene/Eocene. Sediments of the Mesozoic passive continental margin of North America are overthrust by island arc sediments and ophiolite rocks exposed in the Northern Ophiolitic Belt. The Volcanic Arc Terrane following in the Southwest represents a more evolved stage of Middle to Late Cretaceous volcanic arc formations. The role of Cuba in terms of Caribbean tectonics is controversely discussed in various models explaining the plate tectonic evolution of the Caribbean/Gulf of Mexico area. The Pacific model describes an evolution of the Caribbean in the Pacific realm and a later drift into its present position. An alternative hypothesis which has been favoured by the applicant based on many years of experience in Central America (Costa Rica, Panama, Guatemala, Mexico) explains the evolution of the Caribbean in an inter-American position. Based on investigations in structural geology, geomorphology, geochemistry and stratigraphy it is planned to develop the geodynamic history of the ophiolite complexes of Cuba and to contribute to the discussion about the origin of the Caribbean plate. The Cuban ophiolites mark the suture line between the North American continent and the accreted Caribbean tectonostratigraphic terranes. Nappe thrusts are known from all tectonic units, however, detailed kinematic and morphological studies do not exist. The stratigraphic frame particulary of the ophiolitic rocks shall be improved by new determinations of radiolarian faunal associations. Structural parameters are to be investigated in all tectonic units using modern structural geological techniques (e.g. fault slip analysis, shear sense determination in mylonitic rocks etc.). These investigations will be accompanied by geomorphologic studies of selected areas along the suture line combined with detailed structural mapping. Geochemical studies of ophiolitic rocks shall analyze specific Caribbean characteristics as they are known from other places around the Caribbean, e.g. Costa Rica of Panama.

古巴的中生代岩石对于重建加勒比海和墨西哥湾地区的地球动力学历史起着关键作用。古巴在中生代是加勒比板块的一部分，在古新世/始新世期间被吸积到北美板块。北美中生代被动大陆边缘沉积物是由北蛇绿岩带出露的岛弧沉积物和蛇绿岩逆冲形成的。西南的火山弧地体代表了中晚白垩世火山弧构造的一个更进化的阶段。古巴在加勒比海构造中的作用在解释加勒比海/墨西哥湾地区板块构造演化的各种模型中都有争议。太平洋模式描述了加勒比海在太平洋地区的演变，后来漂移到现在的位置。申请人根据在中美洲（哥斯达黎加、巴拿马、危地马拉、墨西哥）多年的经验所支持的另一种假设解释了加勒比在美洲间地位的演变。根据对构造地质学、地貌学、地球化学和地层学的调查，计划发展古巴蛇绿岩复合体的地球动力学历史，并对关于加勒比板块起源的讨论作出贡献。古巴蛇绿岩标志着北美大陆与加勒比增生构造地层地体之间的缝合线。所有的构造单元都知道推覆逆冲，但没有详细的运动学和形态学研究。对放射虫区系组合的新确定将改善蛇绿岩的地层格架，特别是蛇绿岩的地层格架。利用现代构造地质技术（如断层滑动分析、糜棱岩剪切感测定等）研究所有构造单元的构造参数。这些调查将伴随着沿缝合线选定地区的地貌学研究，并结合详细的结构测绘。蛇绿岩的地球化学研究应分析加勒比地区的具体特征，因为这些特征已从加勒比地区的其他地方，例如哥斯达黎加和巴拿马得到证实。