RIDGE2000 Postdoc: Dynamics of Coupled Tectonic/Hydrothermal Systems at Mid-Ocean Ridges; a Damage Rheology Approach

摘要（Spiegleman - 0452457）本研究将建立一个完全耦合的理论和数学基础，利用地震应变数据和热液观测来解释可变形/可渗透和反应介质中的流体流动、岩脉就位和地壳变形。所采用的方法是基于最近发展的理论演变的损坏材料产生的研究人员之一，最近在小规模的实验室实验验证。该研究涉及开发一套越来越复杂的数值和概念模型，以解决海洋中脊脆性/断裂/破裂海洋地壳的耦合变形和热液循环问题。为了约束和验证这些模型，纽约哥伦比亚大学Lamont Doherty地球观测站的研究人员之间将进行合作，这些研究人员在RIDGE 2000综合研究地点拥有裂缝海底热液系统的地理数据和第一手知识，以及这些地区相应的化学、水文和地球物理特征。这些观测数据将用于参数化最终模型，并将使用来自自然系统的数据进行模拟和验证。更广泛的影响：该项目为年轻科学家提供跨学科培训，并促进海洋地质和地球物理学界的国际和跨学科合作。它还开发了一个更通用的框架来理解可变形脆性介质中的流体行为，这是工程中的一个基本问题，具有潜在的应用于地震动力学，火山爆发，山体滑坡和其他自然灾害。

ABSTRACT (Spiegleman - 0452457)This research will develop a fully coupled theory and mathematical basis to explain fluid flow, dike emplacement, and crustal deformation in deformable/permeable and reactive media using seismic strain data and hydrothermal observations. The approach adopted is based on the recently developed theory of evolving damaged materials generated by one of the investigators that has recently been validated at small scales against laboratory experiments. The research involves development of a set of numerical and conceptual models of increasing complexity that address coupled deformation and hydrothermal circulation in brittle/fractured/fracturing ocean crust at mid-ocean ridges. To constrain and verify these models, there will be collaborations between researchers at the Lamont Doherty Earth Observatory of Columbia University in New York who have data and first-hand knowledge of the geography of fractured-seafloor hydrothermal systems at intensively studied RIDGE 2000 integrated study sites and the corresponding chemical, hydrological, and geophysical characteristics in these areas. These observational data will be used to parameterize the final models and simulations will be carried out and ground truthed using data from natural systems. Broader Impacts: This project provides cross-disciplinary training for a young scientist and fosters international and interdisciplinary collaboration in the marine geology and geophysics community. It also develops a more general framework for understanding the behavior of fluids in deformable brittle media, which is a fundamental problem in engineering with potential applications to earthquake dynamics, volcanic eruptions, landslides and other natural hazards.