Magmatic assemblages and metasomatic overprints

从广义上讲，我关注的是地壳岩石的矿物学和岩石学，特别是那些在伸展构造环境中形成的岩石。我记录了岩浆产生的过程，以及从熔融物中析出的水相或从外部析出的水相是如何与刚形成的热岩石在冷却和收缩时相互作用的。演化的火成岩如花岗岩、霞石正长岩和碳酸岩通常涉及壳幔混合物源，可以用同位素地球化学方法进行最好的评价。高场强元素（如Ta、Zr和Ti）的热液迁移性仍然是一个有争议的领域，需要更多的现场研究文件。更多的基性岩石也带有热液印记，在这些情况下，流动性很可能涉及具有重大经济意义的铂族元素。实地研究将集中于安大略省的Bancroft地区、尼日利亚的典型造山年轻花岗岩、巴西borborrema省和西班牙加泰罗尼亚的花岗质伟岩、马达加斯加南部的斜向岩和魁北克省蒙特雷吉亚省的碱性岩石。地壳还带有局部碰撞产生的熔融的印记；一个关于魁北克北部清水湖火山口的项目将揭示该地区变质太古宙基底和石灰岩覆盖层的再融化过程。许多研究项目涉及“前沿”的主题，关于地壳形成的过程。与此同时，它们涉及经济方面，特别是那些涉及铂族元素和高场强元素的研究，因此有可能对加拿大和其他地方这些商品的矿物勘探的最优化产生影响。

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.