High Temperature Fluid-Rock Interaction in the Oceanic Crust: A Fluid Inclusion Study, IODP Expeditions 309 & 312.

洋壳中的高温流体-岩石相互作用：流体包裹体研究，IODP 探险 309

• 批准号: NE/D006597/1
• 负责人: Andrew McCaig
• 金额: $ 0.78万
• 依托单位: University of Leeds
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2006
• 资助国家: 英国
• 起止时间: 2006 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FD006597%2F1
• 关键词: Temperature; Fluid; Rock; Interaction; Oceanic

Due to scientific programmes such as the Integrated Ocean Drilling Program (IODP) we now know a significant amount about the oceanic crust, its processes and products. However, due its inaccessibility and the limitations imposed on research by a sedimentary cover, there remain numerous questions. The question which this project aims to address is that of the evolution of fluids by interaction with rocks as they flow through the oceanic crust. Expeditions 309 and 312 aim to deepen ODP Hole 1256D, which already penetrates through the sediment cover and 502m into volcanic rocks in superfast (20cm/year) spreading crust in the East Pacific. The Hole should penetrate the entire sheeted dyke complex and into the upper gabbros. Mid-ocean ridges are magmatic systems which are the sites of oceanic crustal generation. The ocean crust is cooled by hydrothermal circulation of seawater - this is the focus of this study. These hydrothermal systems are extremely important for a number of reasons including the fact that it is the major process by which the Earth loses heat. In addition, the fact that the hydrothermal fluids react with the oceanic crust as they flow through the crust means that the fluid that is exhaled back into the oceans can be very different from that which was put in (seawater). This means that these processes form a major controlling factor on the composition of seawater. The end members of these systems in modern environments are relatively well known. However, what occurs in between remains a topic of much debate. Studies of fluid inclusions in the oceanic crust have been conducted in the past, but models produced to date do not allow for a detailed appreciation of fluid chemical evolution owing to limitations of analytical techniques. We will be conducting extremely detailed analyses of fluids within the samples from IODP Expeditions 309 & 312 using a variety of techniques including optical microscope petrography, microthermometry, cathodolumiscence and back scattered electron imaging techniques, as well LASER Ablation-Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS). LA-ICP-MS is the technique which will stand this research apart from what has gone before, allowing in situ analysis for major-, minor- and trace-element compositions in individual fluid inclusions. This will allow for the determination of the number of fluids in the system and their sources, as well as being able to accurately target where in the system the major fluid-rock interactions occur. The fact that Expeditions 309 & 312 aim to drill a complete section of oceanic crust means that a continuous hydrothermal system should be able to be studied. Hence the resulting geochemical model for hydrothermal fluid evolution in the oceanic crust should be reliable and well constrained.

由于综合海洋钻探计划(IODP)等科学计划，我们现在对洋壳、其过程和产品有了相当多的了解。然而，由于其难以接近以及沉积盖层对研究施加的限制，仍然存在许多问题。这个项目旨在解决的问题是流体在流经大洋地壳时与岩石相互作用而演变的问题。第309次和第312次探险旨在加深ODP1256D孔的深度，该孔已经穿过沉积物覆盖层，进入东太平洋超高速(20厘米/年)扩张地壳中的火山岩。洞口应穿透整个席状岩墙复合体，进入上部辉长岩。大洋中脊是一种岩浆系统，是洋壳形成的场所。洋壳是通过海水的热液循环来冷却的--这是本研究的重点。这些热液系统极其重要，原因有很多，包括这是地球失去热量的主要过程。此外，热液流体在流经地壳时与洋壳发生反应的事实意味着，喷回海洋的流体可能与注入(海水)的流体截然不同。这意味着这些过程形成了海水成分的主要控制因素。在现代环境中，这些系统的终端成员相对来说是众所周知的。然而，在这两者之间发生了什么仍然是一个有很大争议的话题。过去对洋壳中的流体包裹体进行了研究，但由于分析技术的限制，迄今制作的模型无法详细评价流体的化学演化。我们将使用各种技术对IODP第309和312次探险的样品中的流体进行极其详细的分析，这些技术包括光学显微镜岩相学、显微测温、阴极柱和背散射电子成像技术，以及激光烧蚀-电感耦合等离子体质谱(LA-ICP-MS)。LA-ICP-MS技术将使这项研究有别于以往的研究，允许对单个流体包裹体中的主要、次要和微量元素进行现场分析。这将允许确定系统中流体的数量及其来源，并能够准确地确定系统中发生主要流体-岩石相互作用的位置。第309和312次探险的目的是钻探一整段洋壳，这意味着应该能够研究连续的热液系统。因此，由此得到的洋壳中热液流体演化的地球化学模型应该是可靠的，并受到很好的约束。

项目成果

Drilling to Gabbro in Intact Ocean Crust

• DOI: 10.1126/science.1126090
• 发表时间: 2006-05
• 期刊: Science
• 影响因子: 56.9
• 作者: Douglas S. Wilson;D. Teagle;J. Alt;N. Banerjee;S. Umino;S. Miyashita;G. Acton;R. Anma;S. Barr;A. Belghoul;J. Carlut;D. Christie;R. Coggon;K. Cooper;C. Cordier;L. Crispini;S. R. Durand;F. Einaudi;L. Galli;Yongjun Gao;J. Geldmacher;L. Gilbert;N. Hayman;E. Herrero-Bervera;N. Hirano;S. Holter;S. Ingle;Shijun Jiang;U. Kalberkamp;M. Kerneklian;J. Koepke;C. Laverne;Haroldo L Lledo Vasquez;J. Maclennan;S. Morgan;N. Neo;H. Nichols;Sung-Hyun Park;M. Reichow;T. Sakuyama;T. Sano;R. Sandwell;B. Scheibner;C. Smith-Duque;S. Swift;P. Tartarotti;A. Tikku;M. Tominaga;E. Veloso;T. Yamasaki;S. Yamazaki;C. Ziegler

Seafloor hydrothermal fluid evolution: A fluid inclusion study

海底热液流体演化：流体包裹体研究

• 作者: Sally Morgan (Author)