Exploring variation in hydrothermal alteration of the oceanic crust

探索洋壳热液蚀变的变化

• 批准号: NE/W004887/1
• 负责人: David McNamara
• 金额: $ 3.33万
• 依托单位: University of Liverpool
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FW004887%2F1
• 关键词: Exploring; variation; hydrothermal; alteration; oceanic

The Mid-Atlantic Ridge is the line of undersea mountains that represent where two pieces of the Earth's outer layer of rock are pulling away from each other due to heat circulating in the planet's interior. This spreading region experiences a lot of volcanic activity which creates new rock that forms the ocean floor in the Atlantic. As this region of the Earth spreads, seawater can interact with newly formed rocks by moving into open spaces or cracks in the rock. Understanding how seawater moves around in ocean floor rocks, and how it changes in different areas of the spreading regions, is important. The seawater chemically interacts with the rock and depending on temperature, the chemistry of the rock, and the type of fluid spaces in the rock, changes the types of minerals found there. These chemical changes to the rock control the way rocks respond to earthquakes in these areas, how magma makes its way to the surface through these rocks, and how spreading regions contribute to the carbon cycle of the planet through chemical reaction between rock and seawater. By drilling wells in an example of these spreading areas such as the Reykjanes Ridge, we can sample and examine the type of changes happening to the ocean floor rocks when they react with seawater. We can also lower special tools into these wells to record images and data that will let us understand how the spaces and cracks that allow seawater to move around in the rocks, change in different parts of the spreading ridges. This project will use these types of scientific data to investigate a number of questions we have about spreading ocean floors:1) Do the spaces and cracks in ocean floor rocks change in different parts of the spreading region?2) If changes exist, are they controlled by changing properties of the ocean floor rocks, for example, thickness, differences in the forces that cause spreading, or the nearby presence of large faults?3) What types of microscopic interactions occur that allow chemical reactions between seawater and ocean floor rocks and are they different in different parts of the spreading regions?4) If the types of microscopic interactions change in different areas of ocean floor spreading regions, what properties of the ocean floor rocks control this, such as their thickness and the types of spaces and cracks that let seawater into the rocks?

中大西洋山脊是海底山脉的线，代表地球的两块岩石外层由于地球内部循环的热量而彼此脱离。这个扩散的地区经历了许多火山活动，从而形成了大西洋构成海底的新岩石。随着地球的这个地区蔓延，海水可以通过进入岩石中的开放空间或裂缝来与新形成的岩石相互作用。了解海水如何在海底岩石中四处移动，以及它如何在扩散区域的不同区域变化很重要。海水化学与岩石相互作用，并取决于温度，岩石的化学性质以及岩石中的流体空间类型，改变了那里发现的矿物质的类型。这些化学变化对岩石的控制控制了岩石对这些区域中的地震的反应方式，岩浆如何通过这些岩石进入表面以及扩散区域如何通过岩石和海水之间的化学反应有助于地球的碳循环。通过在这些扩散区域（例如Reykjanes Ridge）的示例中钻孔，我们可以在海水与海水反应时采样并检查海底岩石发生的变化类型。我们还可以将特殊工具降低到这些井中，以记录图像和数据，这些图像和数据将使我们了解使海水在岩石中四处移动的空间和裂缝如何变化，在散布山脊的不同部分变化。该项目将使用这些类型的科学数据来调查我们在扩散海地的许多问题：1）海底岩石中的空间和裂缝是否会在扩散区域的不同部分发生变化？2）如果存在变化？海底岩石在扩散区域的不同部分中是否有所不同？4）如果微观相互作用的类型在海底扩散区域的不同区域发生变化，海底岩石的岩石岩石的哪些特性控制于此，例如它们的厚度以及使海水允许海水进入岩石进入岩石的类型和裂缝？

项目成果

International Ocean Discovery Program Expedition 395C Preliminary Report: Reykjanes Mantle Convection and Climate: Crustal Objectives

国际海洋发现计划第 395C 次探险初步报告：雷克雅内斯地幔对流与气候：地壳目标

• 发表时间: 2022
• 作者: Parnell-Turner R