Magmatic assemblages and metasomatic overprints

岩浆组合和交代叠印

• 批准号: 7721-2007
• 负责人: Martin, Robert
• 金额: $ 2.68万
• 依托单位: McGill University
• 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=474270
• 关键词: Magmatic; assemblages; metasomatic; overprints

In broad terms, I focus on the mineralogy and petrology of crustal rocks, in particular those rocks formed in an extensional tectonic environment. I document what the magma produced, and how an aqueous phase exsolved from the melt or from outside interacts with the just-formed hot rocks as they cool and contract. Evolved igneous rocks like granites, nepheline syenites and carbonatites commonly involve a mixed crust + mantle provenance, which can best be evaluated using isotope geochemistry. The hydrothermal mobility of high-field-strength elements like Ta, Zr and Ti remains a contested area, and requires much more documentation in field-based studies. More basic rocks also bear the hydrothermal imprints, and mobility in those cases may well involve the platinum-group elements, of great economic importance. Field studies will focus on the Bancroft area of Ontario, the classic anorogenic Younger Granites of Nigeria, the granitic pegmatites of the Borborema Province, Brazil, and of Catalunya, Spain, the catazonal rocks of southern Madagascar, and the alkaline rocks of the Monteregian Province of Quebec. The crust also bears the imprint of localized impact-generated melting; a project on the Clearwater Lake craters in northern Quebec will shed light on the remelting of the metamorphic Archean basement and the limestone cover in the area. Many of the research projects address topics at the "cutting edge", about processes that shaped of crust of the Earth. At the same time, they touch on economic aspects, in particular those studies that address the platinum-group elements and the high field-strength elements, and thus have the potential of an impact on the optimization of mineral exploration for those commodities in Canada and elsewhere.

从广义上讲，我关注地壳岩石的矿物学和岩石学，尤其是在延伸构造环境中形成的岩石。我记录了岩浆产生的东西，以及从融化或外部旋转的水相时，它们在冷却和收缩时与刚刚形成的热岩相互作用。花岗岩，肾上腺素的岩石和碳酸盐等发射的岩石通常涉及混合地壳 +地幔出处，最好使用同位素地球化学评估。 TA，ZR和TI等高原强度元素的热液迁移率仍然是一个有争议的领域，并且需要在基于现场的研究中进行更多文档。更基本的岩石也带有水热烙印，在这些情况下，流动性很可能涉及铂金组元素，具有非常重要的经济意义。现场研究将重点关注安大略省的班克罗夫特地区，尼日利亚经典的年轻花岗岩，巴西波伯勒马省的花岗岩pegmatites，以及西班牙卡塔卢尼亚，马达加斯加省南部的卡塔索岩岩，马达加斯加南部的catazonal岩石，以及蒙特雷格尼亚山脉岩石岩石质量。外壳还带有局部撞击产生的融化的烙印。魁北克北部的Clearwater Lake Craters上的一个项目将揭示变质大帝地下室和该地区的石灰石覆盖物的重复。许多研究项目介绍了“最前沿”的主题，涉及地壳塑造的过程。同时，他们涉及经济方面，特别是那些针对铂群元素和高田格强度元素的研究，因此有可能影响加拿大和其他地方的这些商品的优化矿产勘探的优化。