Ferrar Large Igneous Province Study (FLIPS)

费拉尔大型火成岩省研究 (FLIPS)

• 批准号: 9726137
• 负责人: Philip Kyle
• 金额: $ 18.5万
• 依托单位: New Mexico Institute of Mining and Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-07-01 至 2002-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9726137&HistoricalAwards=false
• 关键词: Ferrar; Large; Igneous; Province; Study

This award, provided by the Office of Polar Programs of the National Science Foundation, supports an international collaborative research project involving New Mexico Institute of Mining and Technology, USA, and the British Antarctic Survey (BAS). The objective is to understand the origin, emplacement, and evolution of Jurassic (180 million year old) basaltic rocks in Antarctica which formed when the Gondwana supercontinent started to disintegrate. The research team will test a new unified model for this 180 million year magmatic activity in which the magmatism is caused by a single mantle superplume and is a major factor in continental rifting. Within Antarctica, the Jurassic basaltic rocks are divided into two provinces: Ferrar Large Igneous Province (FLIP) and the Dronning Maud Igneous Province (DMIP) (the official US name for Dronning Maud Land is Queen Maud Land - the foreign term will be used for purposes here because the project is collaborative with BAS). The origin of the FLIP is problematical and a plume origin has generally been discounted because of its lateral distribution over 3000 km along the Transantarctic Mountains and also in southern Australia. The FLIP is characterized by unusual geochemical compositions, which has been attributed to their origin from an enriched mantle source. In the model being investigated by this research team, the FLIP magma would have been significantly contaminated in an upper continental crustal magma chamber (probably the Dufek Intrusion) whereas the DMIP has distinctly mantle-like chemical characteristics but still shows some evidence of modification by crustal material. In this research, the team will examine and sample the rocks of the DMIP and rocks of the FLIP in the Theron and Pensacola Mountains and Dronning Maud Land. The team will conduct an integrated study of the age, geochemistry, and structural relationships of the FLIP and DMIP. Radiometric age determinations will examine the age relationship between the FLIP and DMIP. Models for upper crustal contamination of the FLIP magmas will be tested using isotopic studies and geochemical modeling. Other studies, conducted by BAS collaborators, include a regional aerogeophysical survey to determine the size and shape of the Dufek Intrusion and a detailed survey will search for a feeder dike system from the body.

该奖项由美国国家科学基金会极地项目办公室提供，支持美国新墨西哥矿业与技术研究所和英国南极调查局（BAS）参与的一项国际合作研究项目。目的是了解南极洲侏罗纪（1.8亿年前）玄武岩的起源、就位和演化，这些玄武岩形成于冈瓦纳超大陆开始解体时。研究小组将对1.8亿年岩浆活动的新统一模型进行测试，其中岩浆活动是由单一的地幔超级羽流引起的，是大陆裂谷的主要因素。在南极洲，侏罗纪玄武岩被分为两个省：费拉大火成岩省（FLIP）和Dronning Maud火成岩省（DMIP） （Dronning Maud Land的美国官方名称是Queen Maud Land——这里将使用外国术语，因为该项目是与BAS合作的）。FLIP的起源是有问题的，羽流的起源通常被认为是不可信的，因为它沿着横贯南极山脉和澳大利亚南部分布了3000多公里。FLIP具有独特的地球化学组成特征，这归因于其起源于富集地幔源。在本研究小组所研究的模型中，FLIP岩浆可能在上大陆地壳岩浆房（可能是Dufek侵入）中受到严重污染，而DMIP具有明显的地幔样化学特征，但仍显示出一些地壳物质修饰的证据。在这项研究中，研究小组将对塞隆、彭萨科拉山脉和德鲁宁莫德地的DMIP和FLIP的岩石进行检查和取样。该小组将对FLIP和DMIP的年龄、地球化学和结构关系进行综合研究。放射性年龄测定将检验FLIP和dip之间的年龄关系。FLIP岩浆的上地壳污染模型将使用同位素研究和地球化学模型进行测试。BAS的合作者进行的其他研究包括一项区域航空地球物理调查，以确定Dufek入侵的大小和形状，以及一项详细的调查，将从尸体中寻找馈线堤防系统。