Evolution of the Kerguelen Plume: Constraints from Geochemical Studies of Lava Sequences in the Kerguelen Archipelago

凯尔盖朗羽流的演化：凯尔盖朗群岛熔岩序列地球化学研究的制约

• 批准号: 9614532
• 负责人: Frederick Frey
• 金额: $ 19.25万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-01-15 至 1998-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9614532&HistoricalAwards=false
• 关键词: Evolution; Kerguelen; Plume; Constraints; Geochemical

9614532 Frey The long-term goal of this research is to understand the origin and evolution of the ~115 Ma record of volcanism related to the Kerguelen mantle plume. The Kerguelen plume is particularly important because:1) it is long-lived; 2) all aspects of plume-related volcanism are accessible for study; 3) lavas have a distinctive geochemical signature that may reflect recycling of crust into the deep mantle; and d) formation of the large igneous province (Kerguelen Plateau) in the newly formed Indian Ocean may have enabled dispersal of these plume geochemical characteristics into the Indian Ocean asthenosphere. This proposal seeks to extend the current project to include the recent (40 Ma) volcanic history of this plume that is recorded in a thick sequence of flood basalts which are the major volumetric unit of the Kerguelen archipelago. The chemical composition (major and trace element abundances) and isotopic (He, Sr, Nd, Pb, and Os) characteristics of these lavas will be determined to show how the lava compositions have changed with time (both on a relative and absolute basis with control by 40Ar-39Ar dating) and location in the archipelago.

9614532这项研究的长期目标是了解与Kerguelen地幔羽相关的115 MA火山作用的起源和演变。 kerguelen羽特别重要，因为：1）它是长寿的； 2）易羽相关火山的所有方面都可以进行研究； 3）熔岩具有独特的地球化学特征，可能反映了地壳的回收，将其循环到深壁板中。 d）新形成的印度洋大火成岩省（Kerguelen高原）的形成可能使这些羽状地球化学特征散布到印度洋运动圈中。 该提案旨在扩展当前的项目，以包括该羽流的最近（40 MA）火山历史，该羽流的记录在厚实的洪水盆地中，这是Kerguelen Archipelago的主要体积单元。 这些熔岩的化学成分（主要和痕量元素丰度）和同位素（HE，SR，ND，PB和OS）的特征将确定，以表明熔岩组成如何随时间变化（无论是在40AR-39AR日期由40AR-39AR日期控制的相对和绝对基础上）和群众的位置。