A Detailed Chemical and Isotopic Investigation of Mesozoic Atlantic MORB

中生代大西洋 MORB 的详细化学和同位素研究

• 批准号: 9617676
• 负责人: Paterno Castillo
• 金额: $ 14万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-03-15 至 2000-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9617676&HistoricalAwards=false
• 关键词: Detailed; Chemical; Isotopic; Investigation; Mesozoic

A DETAILED CHEMICAL AND ISOTOPIC INVESTIGATION OF MESOZOIC ATLANTIC MORB (NSF OCE96-17676) This is a proposal to conduct a detailed chemical and Sr, Nd and Pb isotopic investigation of Mesozoic MORB from the central and North Atlantic. Basalts from most of these drill sites have not been investigated in detail before, and samples from only two drill sites have any isotopic data. The objective of the project is to expand our current investigation of the effects of global mid-Cretaceous plume magmatism on the composition of the oceanic upper mantle. Data for Mesozoic Pacific MORB suggest that the Pacific upper mantle underwent rapid and widespread enrichment in highly incompatible elements and radiogenic Sr soon after the initiation of effusive plateau- and seamount-building volcanism in the mid-Cretaceous around 120 Ma. We wish to constrain the magnitude and geographic extent of this upper mantle enrichment "pulse", as it will provide critical information on the nature of the widespread Cretaceous intraplate volcanism, and will allow us to test models relating the origin of the volcanic event to interactions at the core-lower mantle or lower mantle-upper mantle boundaries.

中生代大西洋病态（NSF OCE96-17676）的详细化学和同位素研究这是对中央和北大西洋中部和北大西洋中学病态的详细化学化学和PB同位素研究的提议。大多数这些钻头位点的玄武岩之前尚未进行详细研究，只有两个钻头的样品具有任何同位素数据。该项目的目的是扩大我们目前对全球中间羽流岩浆对海洋上层地幔组成的影响的研究。 中生代太平洋病原体的数据表明，在高度不相容的元素和放射原源SR中，太平洋上地幔经历了迅速的富集，并在启动高原和海山建造火山爆发后不久，大约120 mA。我们希望限制这种上地幔富集的“脉冲”的大小和地理范围，因为它将提供有关白垩纪广泛的白垩纪性质内部性质性质的关键信息，并将允许我们测试与火山型事件与核心 - 较低壁炉上的相互作用的起源或核心地幔或下地幔 - 地幔 - 地幔 - 地幔 - 甲板室的相互作用。