Metal sources for hydrothermal deposits : assessing the magmatic contribution

热液矿床的金属来源：评估岩浆贡献

• 批准号: 288197-2008
• 负责人: Conly, Andrew
• 金额: $ 1.46万
• 依托单位: Lakehead University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2009
• 资助国家: 加拿大
• 起止时间: 2009-01-01 至 2010-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=427242
• 关键词: Metal; sources; hydrothermal; deposits; assessing

The proposed study is to investigate the origin of metals in hydrothermal deposits. Knowing where metals in these types of deposit orginate from impacts both our scientific understanding of ore formation processes and the discovery of innovative methods for the identification and evaluation of new exploration targets. The source of metals for these deposits is a matter of great debate, with two prevailing theories: 1) hydrothermal sources, where metals originate from the passage of hot waters (up to 350 degC) through cracks and pores within the rocks beneath Earth's surface, with interaction between the hot water and the rock resulting in the transfer of metals to the fluid; or, 2) magmatic sources, where metals are sequestered by gases and fluids trapped within the molten magma. This study will determine the extent to which metals are removed from the magma and transferred to the gas-water component at great depths beneath the Earth's surface. The fundamental information to be obtained in the study is the chemical compositions of melt inclusions, small remnants of volcanic glass, gas and water trapped in minerals that formed in the magma prior to eruption. Melt inclusion analyses will be complemented by investigating the chemical nature of metals in magmas and hydrothermal fluids through several experimental studies, where the high-temperature and pressure conditions that characterize the deeper levels of the Earth's crust will be simulated in the laboratory. Several analytical techniques using state-of-the-art, high precision geochemical instrumentation will be required to obtain accurate compositions of natural melt inclusions and experimental products. This study will form the basis of several undergraduate and graduate research projects at Lakehead University, which will benefit Canada by training highly qualified geoscientists. The applied nature of the research will benefit the mining and exploration sector by improving our understanding of processes involved in the formation of metallic mineral deposits, which can be used to develop new strategies for their discovery and sustainable development.

拟议的研究是研究水热沉积物中金属的起源。 了解这些类型的金属在哪里产生了我们对矿石形成过程的科学理解，以及发现创新方法以识别和评估新探索目标。 这些沉积物的金属来源是一个很大的争论，具有两个流行的理论：1）水热来源，其中金属源于热水（最高350摄氏度）通过地面以下岩石中的裂缝和孔，在热水和岩石之间的相互作用中，在热水和岩石之间的相互作用，导致了金属向液体转移到液体中；或2）岩浆来源，其中金属被熔融岩浆中的气体和流体隔离。 这项研究将确定从岩浆中除去金属的程度，并在地面以下大深处转移到气水分。 研究中要获得的基本信息是熔体夹杂物的化学成分，火山玻璃的小残余物，被困在喷发前在岩浆中形成的矿物质中的矿物质和水。 通过几项实验研究，将在实验室中模拟融化的纳入分析，通过研究岩浆和水热流体中金属和水热流体的化学性质，在实验室中模拟了地壳更深层次的高度和压力条件。 使用最先进的高精度地球化学仪器的几种分析技术将需要获得天然熔体夹杂物和实验产物的准确组成。 这项研究将构成莱克黑德大学的几个本科和研究生研究项目的基础，该项目将通过培训高素质的地球科学家而受益。 该研究的应用性质将通过提高我们对形成金属矿藏涉及的过程的理解来使采矿和勘探部门受益，这些过程可用于制定新的策略，以发现其发现和可持续发展。