Accomplishment Based Renewal to OCE-0526905: The Geology and Tectonics of Ultraslow Spreading Ridges

摘要（Dick 0827825）学术价值：在超过四分之一世纪的时间里，海洋地壳一直被认为是一个简单的层状结构，由覆盖在“席状岩脉”上的熔岩组成，当地球撕裂时，岩浆的冻结残余物沿着在熔岩下面形成的裂缝运输，最后是在海底火山下面的岩浆房中结晶的一层厚厚的粗辉长岩。 这项研究的目标是整合数据，从详细的岩石描述的岩石从一个新的类的洋中脊扩展中心与现有的本地测深侧扫声纳和海底视频，以及与海表磁力和重力的三个密集采样区域的Gakkel和西南印度洋脊（SWIR）。 由此产生的综合将绘制在一起，第一次，一张图片的地质和地壳结构的代表性构造端元的超低速扩张中心脊。这项工作很重要，因为这类相对较新发现的洋中脊扩张中心，其地质目前知之甚少，约占全球洋脊系统的30%。 更广泛的影响：这项工作的更广泛影响将增加海底科学的基础设施，为来自超低速扩张洋脊的样本建立一个记录良好、随时可查阅的数据库，使更多的调查人员能够查明和获得新研究的关键材料。 它还将培训地质学本科生识别海底岩石，并将这些数据作为他们毕业论文的基础。 还将为研究生建立一个创新实验室，从事岩石识别、描述和海底样品与海洋地球物理研究的结合。 这项研究也是当地学校和伍兹霍尔海洋研究所在其展览中心举办的“科学公开”系列公开讲座的基础。

Abstract (Dick 0827825)Intellectual Merit: For over a quarter century the ocean crust has been though to be a simple layered structure comprised of lavas overlying "sheeted dikes", the frozen remains of magma transported along the cracks that form beneath the lavas as the earth tears apart, and finally a thick layer of coarse gabbro rock crystallized in magma chambers beneath the seafloor volcanoes. The goals of this research are to integrate data from detailed rock descriptions of rocks from a new class of mid-ocean ridge spreading center with available local bathymetry from side scan sonar and seafloor video as well as with sea surface magnetics and gravity for three densely sampled regions of the Gakkel and Southwest Indian Ridges (SWIR). The resulting synthesis will draw together, for the first time, a picture of the geology and crustal architecture of representative tectonic end-members for ultraslow spreading centers ridges. The work is important because this relatively recently discovered class of mid-ocean ridge spreading centers, whose geology is presently poorly known, comprise about 30% of the global ridge system. Broader Impacts: The broader impacts of this work will increase the infrastructure for seafloor science by generating a well-documented readily accessible database for samples from ultraslow spreading ridges that will enable additional investigators to identify and obtain key material for new research. It will also train undergraduate geology majors in the identification of seafloor rocks and data from these will form the basis of their senior theses. An innovative laboratory for graduate students in rock identification, description, and integration of seafloor samples into marine geophysical studies will also be developed. The research also forms the basis for public talks on the ocean crust at local schools and at the Woods Hole Oceanographic Institution's public lecture series "Science Made Public" at its exhibit center.