Mafic Layered Intrusions Through Time

随着时间的推移，镁铁质层状侵入

• 批准号: 249474-2013
• 负责人: Scoates, James
• 金额: $ 2.91万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=594264
• 关键词: Mafic; Layered; Intrusions; Through; Time

Mafic layered intrusions crystallize from basaltic magma to form large bodies of igneous rocks that exhibit prominent layering, preserving stunning rock records of the processes by which magma evolves within the Earth's crust. These intrusions contain world-class deposits of chromium (Cr), platinum group elements (PGE), and vanadium (V), metals that are vital to industry and society in general. Despite their scientific and practical importance, precise age constraints are lacking and many aspects of their origin and formation are still poorly known. The proposed research aims to fill these critical knowledge gaps and will take advantage of recent analytical developments and state-of-the-art instrumentation to constrain the age, duration, and cooling of mafic layered intrusions. This will be achieved by detailed fieldwork and geochemical analysis of rocks and minerals from some of the world's largest and most influential layered intrusions that collectively represent a significant span of Earth history (over 2.5 billion years): (1) the Stillwater Complex, the exposed fragment of a large layered intrusion in the Beartooth Range of the Wyoming Archean Province, including the PGE-rich J-M Reef, (2) the Bushveld Complex, the world's largest layered intrusion, located in the northern Kaapvaal craton of South Africa, and host to some of the richest Cr-PGE-V ore deposits on Earth, (3) the Great Dyke, a 550 km-long layered intrusion in the Zimbabwe craton of southern Africa, containing the world's second largest reserve of PGE, (4) the Kiglapait Intrusion, a bowl-shaped intrusion exposed in the Nain Plutonic Suite of coastal Labrador, and (5) the Skaergaard Intrusion of eastern Greenland, one of the most remarkable layered igneous bodies on Earth that is related to thick sequences of continental flood basalts and opening of the North Atlantic Ocean. The proposed research will yield new scientific insights on timescales of magmatic processes and cooling for these striking rocks, challenging presently known basic concepts of magma crystallization and evolution. The results of this work will have direct implications for the origin of magmatic ore deposits and can be applied to the investigation of less well-studied intrusions in Canada and worldwide.

梅菲（Mafic）分层的入侵从玄武岩岩浆结晶，形成了巨大的火成岩体，这些岩石表现出突出的分层，并保存了令人惊叹的岩石记录，岩浆在地壳中演变而来的过程。这些入侵包括铬（CR），铂群元素（PGE）和钒（V）的世界一流沉积物，这些金属对工业和社会至关重要。尽管缺乏精确的年龄限制，但它们的起源和形成的许多方面仍然鲜为人知。拟议的研究旨在填补这些关键的知识差距，并将利用最近的分析发展和最先进的仪器来限制镁铁质分层侵入的年龄，持续时间和冷却。 This will be achieved by detailed fieldwork and geochemical analysis of rocks and minerals from some of the world's largest and most influential layered intrusions that collectively represent a significant span of Earth history (over 2.5 billion years): (1) the Stillwater Complex, the exposed fragment of a large layered intrusion in the Beartooth Range of the Wyoming Archean Province, including the PGE-rich J-M Reef, (2) the Bushveld Complex,世界上最大的分层入侵位于南非北部的北非克拉顿北部，并在地球上拥有一些最富有的Cr-pge-v矿床，（（3）大堤坝，是550公里长550公里的分层侵入，在南部非洲的Zimbabwe craton中，包括世界上第二大的PGE（4）Intrumation（4）Ist Intrapt of the Kig（4），这是Kig的著作（4），这是（4），这是4）interife of the Intrapt of kig of（4）沿海拉布拉多（Nain Plutonic）的Nain Plutonic套件，以及（5）东格陵兰东部的Skaergaard入侵，这是地球上最杰出的分层火成岩之一，与大陆洪水层面的厚序列和北大西洋的开口有关。拟议的研究将对这些引人注目的岩石的岩浆过程时间表和冷却，从而产生新的科学见解，从而挑战了目前已知的岩浆结晶和进化的基本概念。这项工作的结果将对岩浆矿床的起源有直接的影响，并可以应用于对加拿大和全球范围内较少的侵入率的调查。