Tectonic & Petrologic Evolution of the Atlantis Bank Oceanic Core Complex

在大洋板块形成的区域，裂谷作用、岩浆作用和地壳内海水循环之间的相互作用是复杂的。这项研究的目的是绘制印度洋一个有利地点--亚特兰蒂斯浅滩--系统的每一个组成部分的分布情况。长期的断裂和隆起暴露了板块的横截面，过去几次研究巡航的数据都是可用的，但以前没有进行过系统的分析和汇编。将数据整理和摄取到地球综合数据应用程序数据库将使结果公开，一名本科生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计划于2016年开始的新的深水国际海洋发现计划科学钻探的场地特征，并纳入先前钻探的结果。将绘制新的亚特兰蒂斯浅滩地质图，并用于解决有关亚特兰蒂斯浅滩海洋核心综合体的三维结构和开发问题。对现有潜水和疏浚样品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可能在其演化中发挥作用的方式的基础上。将利用亚特兰蒂斯浅滩海底暴露的少数可利用的MyR时间窗口，系统地探索岩脉和辉长岩注入之间的关系。除了基于现有样品和海底视频的新制图外，该项目还将结合以前的成果，进行更全面的三维地质解释。岩脉/辉长岩分析被认为是对大洋地壳形成的岩石圈‘翻滚’模型的一种测试。

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.