Stratigraphic markers in Archean Greenstones

太古代绿岩中的地层标记

• 批准号: 238659-2009
• 负责人: Thurston, Phillips
• 金额: $ 1.46万
• 依托单位: Laurentian University of Sudbury
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2011
• 资助国家: 加拿大
• 起止时间: 2011-01-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=478921
• 关键词: Stratigraphic; markers; Archean; Greenstones

The research concentrates on the Abitibi greenstone belt, a region of old volcanic rocks that span the Ontario Quebec border from Timmins to Chibugamau. This belt of volcanic rocks is the source of the gold, copper and zinc that is the economic lifeblood of the region. Research as established that the many volcanic units are separated by iron rich sediments that represent pauses in volcanism. The iron-rich sediments vary in their contained minerals and their chemistry. The chemistry of these rocks vary as a function of how close they are to copper and zinc mineralization. The research will focus on how to use the variations in chemistry to identify likely areas with new mineral deposits. A second project will build a 3-D model of this belt of volcanic rocks. The model willbe built using computer based techniques and will result in improved ability to predict where future mines lie. A third aspect to the project will be to understand the controls on the variations in volcanism and production of sedimentary rocks with time. This aspect of the project will examine greenstone belts in Canada and elsewhere to establish the controls on what types of volcanic and sedimentary rocks occur where.

这项研究集中在阿比蒂比绿岩带，这是一个古老的火山岩地区，横跨安大略魁北克边界，从蒂明斯到奇布加茂。这个火山岩带是金、铜和锌的来源，是该地区的经济命脉。研究表明，许多火山单元被富含铁的沉积物隔开，这些沉积物代表火山活动的暂停。富含铁的沉积物在其所含的矿物和化学性质上各不相同。这些岩石的化学成分随着它们与铜和锌矿化的接近程度而变化。该研究将侧重于如何利用化学变化来确定可能存在新矿藏的地区。第二个项目将建立这一火山岩带的三维模型。该模型将使用基于计算机的技术建立，并将提高预测未来地雷位置的能力。该项目的第三个方面是了解火山作用和沉积岩生产随时间变化的控制因素。该项目的这一方面将研究加拿大和其他地方的绿岩带，以确定对什么类型的火山岩和沉积岩的控制。