Mineralogical and geochemical approaches to tectonic problems

构造问题的矿物学和地球化学方法

基本信息

批准号：
RGPIN-2016-04310
负责人：
PePiper, Georgia
金额：
$ 2.4万
依托单位：
Saint Mary's University
依托单位国家：
加拿大
项目类别：
Discovery Grants Program - Individual
财政年份：
2019
资助国家：
加拿大
起止时间：
2019-01-01 至 2020-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=684840
关键词：
Mineralogical geochemical approaches tectonic problems

项目摘要

The proposed work uses the mineral composition of rocks to better understand aspects of the Earth's tectonic history. The first part of the work is carried out in the Scotian Basin, offshore Nova Scotia, where both oil and gas have been produced from deeply buried sandstones that are 100 to 150 million years old. I analyse minerals from the sandstones, to determine the original source of the sands that were deposited in large deltas. The rivers supplying sand to the deltas were likely controlled by the effects on the landscape of progressive opening of the North Atlantic Ocean and Labrador Sea. The type of sands transported by rivers influences the quality of the sandstones as reservoir rocks for oil and gas. The migration of fluids within the basin also influences reservoir quality. I will use evidence from mineral cements and their fluid inclusions to understand how movement of buried salt affected fluid migration and reservoir quality. A second part of the work uses minerals in igneous rocks such as granites to better understand where the parent magmas were derived from, where the rocks crystallised, and how they were altered by later ore-depositing fluids. This component of the work is directed at understanding better the tectonic history of continental areas behind active subduction zones. Undergraduate and graduate students will be educated in methods of geological problem solving using minerals that contribute to broader questions of tectonics.

拟议的工作利用岩石的矿物质组成来更好地了解地球构造历史的各个方面。这项工作的第一部分是在新斯科舍省海上盆地进行的，那里的石油和天然气都是由100至1.5亿年历史的深埋的砂岩生产的。我分析了来自砂岩的矿物质，以确定沉积在大三角洲的沙子的原始来源。向三角洲提供沙子的河流很可能受到对北大西洋和拉布拉多海渐进开放的景观的影响。河流运输的沙子类型影响了砂岩的质量，作为石油和天然气的储层岩石。盆地内流体的迁移也会影响储层质量。我将使用矿物质水泥及其液体夹杂物的证据来了解埋藏盐的运动如何影响液体迁移和储层质量。工作的第二部分使用矿物质（例如花岗岩）中的矿物质，以更好地了解父母岩浆的衍生物，岩石结晶的位置以及如何通过后来的矿石沉积液来改变它们。这项工作的这一组成部分旨在更好地理解主动俯冲带背后大陆地区的构造历史。本科生和研究生将接受有关矿物质解决地质问题的方法的教育，这些矿物质解决了更广泛的构造问题。