Geochemistry and Petrology of the Lower Crust, Antarctica: Evaluation over Space and Time

南极洲下地壳的地球化学和岩石学：时空评估

• 批准号: 8816988
• 负责人: Jonathan Berg
• 金额: $ 19.6万
• 依托单位: Northern Illinois University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-08-01 至 1993-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8816988&HistoricalAwards=false
• 关键词: Geochemistry; Petrology; Lower; Crust; Antarctica

This project will study two suites of xenolith samples of the earth's unexposed crust and mantle brought to the surface in the western Ross Sea, Antarctica, as inclusions in mafic magma, but separated by a time interval of nearly 500 million years. These samples offer the opportunity to better understand the geologic and tectonic history of the enigmatic Transantarctic Mountains region, during both its current uplift phase and its much earlier history as an orogenic belt. Constraints regarding the tectonic history and reconstruction of Gondwanaland should also result as well as increasing our fundamental knowledge and understanding of upper mantle and lower crustal composition and evolution. The results of this study will provide critical information for completion of cross-sections in the Global Transect Program and for interpretations of geophysical data collected internationally in the Ross Sea.

该项目将研究两套捕虏体样品， 地球未暴露的地壳和地幔被带到地表， 南极洲罗斯海西部，镁铁质岩浆中的包裹体，但 相隔近5亿年 这些 样品提供了更好地了解地质的机会， 神秘的跨南极山脉的构造历史 在其目前的隆起阶段和更早的时期， 历史上是一个造山带。 关于构造的限制 冈瓦纳大陆的历史和重建， 以及增加我们的基本知识和理解， 上地幔和下地壳的组成和演化。 的 这项研究的结果将提供关键信息， 完成全球样带计划中的横截面， 解释国际上收集的地球物理数据 在罗斯海。