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是由一个相对较新的“初期裂谷”界定的，这是一个缓慢扩张的新裂谷，方向与活跃的东太平洋隆起（EPR）垂直（沿着一条流动线）。pi建议用多波束绘制这个早期裂谷的完整地图，通过蜡取心和疏浚进行玄武岩取样，并在裂谷内运行一些拖曳式摄像机。根据一项初步研究的样本，初期裂谷提供了在跨轴维度上对EPR熔化状态的行为进行采样的机会，并检查随着人们远离活跃的EPR轴而发生的熔化量的变化。测绘和摄像工作将有助于找到好的采样点，也将有助于确定800米的早期裂谷陡坡是否暴露出更深的岩石，这可能是对赫斯深和EPR形成的年轻地壳性质研究的有益补充。拟议的研究将在联卢观察团一艘大型船只上进行（要求在梅尔维尔港停留23天），随后对样品进行实验室研究，并对相机和多波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.