Interaction Between Asthenospheric and Lithospheric Melts: Alkalic Volcanism in the Rungwe Province, African Western Rift

软流圈和岩石圈熔体之间的相互作用：非洲西部裂谷伦圭省的碱性火山活动

• 批准号: 9406109
• 负责人: Tanya Furman
• 金额: $ 4.9万
• 依托单位: University of Virginia Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-07-01 至 1996-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9406109&HistoricalAwards=false
• 关键词: Interaction; Between; Asthenospheric; Lithospheric; Melts

9406109 Furman This is part of long-term research program that integrates field, geochronologic, geochemical, isotopic, petrographic and experimental data on young lavas to determine the dynamics of continental rift volcanism. The Rungwe volcanic province in Tanzania was selected for detailed study because samples for m this area will contribute to understanding both large-scale geodynamic problems and regional tectonic questions. A fundamental objective is to investigate the geochemical consequences of mixing between asthenospheric and lithospheric source melts. A second objective is to document temporal variations in lava geochemistry at individual volcanic centers. All samples analyzed in this study are currently in hand; only fresh samples of young lavas will be used. High quality petrographic, mineralogic and geochemical (including incompatible trace and rare earth element) data will be interpreted in conjunction with available isotopic (Sr, Nd, Pb, O, He) data on the same samples. The investigation at Rungwe will enable both local and regional syntheses of data on the dynamics of asthenosphere-lithosphere interaction in the genesis of continental rift volcanism.

9406109 Furman这是长期研究计划的一部分，该计划整合了年轻熔岩的野外、地质年代学、地球化学、同位素、岩相学和实验数据，以确定大陆裂谷火山活动的动力学。 选择坦桑尼亚的Rungwe火山区进行详细研究，因为该地区的样品将有助于了解大规模的地球动力学问题和区域构造问题。 一个基本的目标是调查软流圈和岩石圈源熔体之间的混合的地球化学后果。 第二个目标是记录各个火山中心熔岩地球化学的时间变化。 本研究中分析的所有样品目前都在手中;只使用年轻熔岩的新鲜样品。 高质量的岩相学、矿物学和地球化学（包括不相容的微量元素和稀土元素）数据将结合相同样品的可用同位素（Sr、Nd、Pb、O、He）数据进行解释。 在Rungwe的调查将使当地和区域的综合数据的动力学软流圈岩石圈相互作用的大陆裂谷火山作用的成因。