Collaborative Research: Geochemical and Geological Investigation of the "Incipient Rift" at 2o40'N, east of the East Pacific Rise

加拉帕戈斯微板块的北部边界由一个相对较新的“初始裂谷”定义，它是一个缓慢扩展的新裂谷，与活动的东太平洋隆起(EPR)垂直(沿着一条流线)。PI建议用多波束完全绘制这个初始裂谷的地图，通过蜡取芯和疏浚进行玄武岩取样，并在裂谷内进行一些拖曳相机导线。根据一项初步研究的样本，初期的裂谷提供了一个机会，可以在横轴维度上采样EPR熔融区域的行为，并检查随着一个人距离活动的EPR轴移动得更远而发生的融化量的变化。测绘和摄像工作将有助于定位良好的采样点，还将有助于确定早期裂谷的800米悬崖是否暴露出更深的岩石，这可能是对赫斯深度和在EPR形成的年轻地壳性质研究的有益补充。拟议的研究将在联合国日内瓦办事处的一艘大型船只上进行(要求梅尔维尔23天)，随后将对样品进行实验室研究，并对相机和多光束结果进行实验室研究。

The northern boundary of the Galapagos microplate is defined by a relatively recent "Incipient Rift" that is a slow-spreading new rift oriented orthogonal (along a flowline) to the active East Pacific Rise (EPR). The PIs propose to map this incipient rift completely with multibeam, to conduct basalt sampling by wax coring and dredging, and to run some towed camera traverses within the rift. Based on samples from a pilot study, the incipient rift offers the opportunity to sample the behavior of the EPR melting regime in the across-axis dimension and to examine changes in the amount of melting that takes place as one moves farther from the active EPR axis. The mapping and camera work will help to locate good sampling sites and will also help to determine whether the 800m scarps of the incipient rift expose deeper rocks, potentially a useful complement to studies of Hess Deep and the nature of young crust formed at the EPR. The proposed study would be carried out on a large UNOLS vessel ( 23 days of Melville requested), with subsequent laboratory study of samples, and laboratory study of camera and multibeam results.