Tectonic & Petrologic Evolution of the Atlantis Bank Oceanic Core Complex

构造

• 批准号: 1434452
• 负责人: Henry Dick
• 金额: $ 37.81万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-09-01 至 2016-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1434452&HistoricalAwards=false
• 关键词: Tectonic; & Petrologic; Evolution; Atlantis

The interplay between rifting, magmatism, and circulation of seawater within the crust is complex in the zone where oceanic plates form. This study aims to map the distribution of each of these components of the system at an advantageous site in the Indian Ocean- the Atlantis Bank. Long-lived faulting and uplift has exposed a cross section of the plate and data from several past research cruises are available but had not previously been systematically analyzed and compiled. Curation and ingest of the data into the Integrated Earth Data Applications database will make the results openly available, and an undergraduate intern will receive training in this work. The completed geologic map and interpretations will serve as Site characterization for new, deep International Ocean Discovery Program scientific drilling that is scheduled to begin in 2016, as well as incorporating results of prior drilling.A new geologic map of Atlantis Bank will be made and used to address questions about the 3-D structure and development of the Atlantis Bank oceanic core complex. Analysis of existing dive and dredge samples will build on recent recognition of the importance of strain localization and ways that magma and hydrothermal fluids may play a role in its evolution. Relations between dike and gabbro injection will be systematically explored, taking advantage of the few Myr window of time accessible in the Atlantis Bank seafloor exposures. In addition to new mapping based on existing sample and seafloor video, the project will combine prior results in a more comprehensive 3-D geologic interpretation. The dike/gabbro analysis is envisioned as a test of the lithospheric 'rollover' model of ocean crust formation.

在海洋板块形成的区域，地壳内裂谷作用、岩浆作用和海水循环之间的相互作用是复杂的。这项研究的目的是映射在印度洋的一个有利的网站-亚特兰蒂斯银行的系统的这些组件的分布。长期的断层和隆起暴露了板块的横截面，过去几次研究航行的数据是可用的，但以前没有系统地分析和汇编。数据的管理和摄取到综合地球数据应用数据库中将使结果公开，一名本科实习生将接受这项工作的培训。完成的地质图和解释将作为新的、深的国际海洋发现计划科学钻探的场地特征描述，该钻探计划定于2016年开始，并将纳入先前钻探的结果。将绘制一幅新的亚特兰蒂斯海岸地质图，并用于解决有关亚特兰蒂斯海岸海洋核心复合体的三维结构和发展的问题。对现有潜水和挖掘样本的分析将建立在最近认识到应变局部化的重要性以及岩浆和热液流体可能在其演变中发挥作用的方式的基础上。将系统地探讨岩墙和辉长岩注入之间的关系，利用亚特兰蒂斯银行海底暴露的几个百万年的时间窗口。除了根据现有样品和海底视频进行新的绘图外，该项目还将联合收割机结合以前的成果，进行更全面的三维地质解释。岩脉/辉长岩分析被设想为海洋地壳形成的岩石圈“翻转”模型的测试。