Effects of Magmatic Underplating on the Lower Crust: A Field Study of the Ivrea-Verbano Zone, Northern Italy

岩浆底侵对下地壳的影响：意大利北部伊夫雷亚-韦尔巴诺带的实地研究

• 批准号: 9017894
• 负责人: Arthur Snoke
• 金额: $ 12万
• 依托单位: University of Wyoming
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-03-01 至 1995-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9017894&HistoricalAwards=false
• 关键词: Effects; Magmatic; Underplating; Lower; Crust

The concept of underplating of continental crust by magma is fundamental to tectonics but is difficult to evaluate because there is as yet little documented geological evidence. This project is a field-based study of an exposed zone of probable crustal under- plating in the Ivrea-Verbano zone of the northern Italian Alps. This zone provides an exceptional cross-section of lower continental crustal rocks extensively intruded by mafic igneous rocks. A new 1:25,000 geologic map will be prepared across the Ivrea-Verbano zone, and structural and kinematic studies will be undertaken at the same time. Close collaboration with Italian geologists working in the area will be maintained throughout. The field mapping will form a basis for future detailed petrological, geochemical, and geochronological studies aimed at understanding the physical and chemical evolution of the underplated region. The results of this study will allow development of a general model, for and will considerably improve our understanding of, the origin and evolution of underplated continental crust in tectonically active regions.

岩浆使大陆地壳下覆的概念是构造学的基础，但由于迄今鲜有记录在案的地质证据，因此很难加以评价。本项目是对意大利北部阿尔卑斯山脉伊夫雷-韦尔巴诺带可能的地壳下镀暴露带进行实地研究。该带提供了一个被基性火成岩广泛侵入的下陆相地壳岩石的特殊截面。将在伊夫雷-韦尔巴诺地区编制一份新的1:25 000地质图，并同时进行结构和运动学研究。将始终与在该地区工作的意大利地质学家保持密切合作。野外测绘将为今后详细的岩石学、地球化学和地质年代学研究奠定基础，这些研究旨在了解下覆区域的物理和化学演化。这项研究的结果将允许开发一个通用模型，并将大大提高我们对构造活跃地区下覆大陆地壳的起源和演化的理解。