Accessory minerals as fertility indicators in copper porphyry systems

副矿物作为铜斑岩系统中的肥力指标

• 批准号: 2277070
• 金额: --
• 依托单位: University of Leicester
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2277070
• 关键词: Accessory; minerals; fertility; indicators; copper

Porphyry copper deposits host three quarters of the worlds copper resources. Despite generally greater agreement on the processes leading to mineralization, it is still debated what makes a magmatic system 'fertile', possessing the ability to form large resources. Due to the hydrous nature of porphyry mineralization, whole rock geochemistry is often distorted and potentially misleading. Analysing robust accessory minerals e.g. zircon grants the unique opportunity to see through alteration and investigate the previously active magmatic conditions during petrogenesis. My project aims to compare the geochemistry of several accessory minerals within 'fertile' and 'barren' magmas (no potential for mineralisation). This will involve the study of pre-, syn- and post-mineralization rocks from the world class Santo Thomas II Cu-Au deposit, Luzon, Philippines. These geochemical signatures will be compared with those found in modern analogues of 'fertile' (Pinatubo) and 'barren' (Taal) systems. This will allow the investigation of key magmatic processes leading to the, still ambiguous, generation of porphyry copper fertility.This project will also investigate the role of magmatic brine lenses believed to be forming at Tall.

斑岩铜矿蕴藏着世界四分之三的铜资源。尽管人们普遍对导致矿化的过程达成了更大的共识，但是什么使岩浆系统变得“肥沃”并具有形成大量资源的能力仍然存在争议。由于斑岩矿化的含水性质，整个岩石地球化学常常被扭曲并可能产生误导。分析强大的辅助矿物质，例如锆石提供了独特的机会来观察蚀变并研究岩石成因过程中先前活跃的岩浆条件。我的项目旨在比较“肥沃”和“贫瘠”岩浆（没有矿化潜力）中几种副矿物的地球化学。这将涉及对菲律宾吕宋岛世界级 Santo Thomas II 铜金矿床的矿化前、同化和后矿化岩石进行研究。这些地球化学特征将与现代“肥沃”（皮纳图博）和“贫瘠”（塔尔）系统类似物中发现的地球化学特征进行比较。这将有助于对导致斑岩铜肥力产生的关键岩浆过程进行调查，但这一过程仍不明确。该项目还将调查据信在塔尔形成的岩浆卤水透镜体的作用。