The Timing, Duration and Correlation of North Atlantic Igneous Province Magmatism

北大西洋火成岩省岩浆活动的时间、持续时间和相关性

• 批准号: 9903056
• 负责人: Robert Duncan
• 金额: $ 8.25万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-07-01 至 2001-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9903056&HistoricalAwards=false
• 关键词: Timing; Duration; Correlation; North; Atlantic

9903056DuncanWe will participate in an international collaborative investigation of the timing, genesis and evolution of the North Atlantic Igneous Province (NAIP), a classic volcanic rifted margin. It has been proposed that this large igneous province was constructed at the initiation of Iceland mantle plume activity, remnants of which include the West and East Greenland margin basalts, the Faeroe Islands, the British Tertiary Province, and extensive sequences of lava flows and sills that form most of the continental margins of the North Atlantic (seaward-dipping reflectors). We will contribute radiometric age determinations by the 40Ar-39Ar incremental heating method, for whole rock and mineral separates to define the timing and duration of volcanism, and in support of correlating volcanic stratigraphy across the province. Precise age determinations are required to establish the timeframe of widely separated volcanic and intrusive remnants, determine magma production rates through the volcanic history, describe the sequence and duration of magmatic phases in different tectonic settings, and correlate peak volcanic phases with the sedimentary record of environmental response to this large igneous province. The first order goal of the program is to use the record of magmatism and tectonism throughout the province to assess "active" (plume head) vs "passive" (plume incubation) models of continental rifting in the presence of a mantle plume.

[903056]邓肯我们将参加北大西洋火成岩省（NAIP）的时间、成因和演化的国际合作调查，这是一个经典的火山裂谷边缘。有人提出，这个大的火成岩省是在冰岛地幔柱活动开始时建造的，其残余包括西格陵兰和东格陵兰边缘玄武岩，法罗群岛，英国第三纪省，以及形成北大西洋大部分大陆边缘的熔岩流和岩脊的广泛序列（向海倾斜反射体）。我们将通过40Ar-39Ar增量加热法提供辐射年龄测定，用于整个岩石和矿物分离，以确定火山作用的时间和持续时间，并支持全省火山地层的关联。为了建立广泛分离的火山和侵入遗迹的时间框架，通过火山历史确定岩浆生产速度，描述不同构造背景下岩浆相的序列和持续时间，并将火山峰相与该大火成岩省环境响应的沉积记录相关联，需要精确的年龄测定。该项目的首要目标是利用全省的岩浆活动和构造活动记录来评估地幔柱存在时大陆裂谷的“主动”（地幔柱头）和“被动”（地幔柱孵化）模式。