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方边界是由一个相对较新的“初始裂谷”定义的，该裂谷是一个缓慢扩展的新裂谷，方向与活跃的东太平洋海隆（EPR）正交（沿着流线）。PI建议用多波束完全绘制这个早期的裂谷，通过蜡芯和疏浚进行玄武岩取样，并在裂谷内进行一些拖曳式相机穿越。基于从试点研究的样本，初期的裂缝提供了机会，样品的行为EPR熔融制度的横轴尺寸，并检查的熔融量的变化，发生在远离活跃的EPR轴移动。测绘和照相工作将有助于找到良好的取样地点，也将有助于确定早期裂谷的800米陡崖是否暴露出更深的岩石，这可能是对赫斯深海研究和EPR形成的年轻地壳性质的有益补充。拟议的研究将在联合国海洋和海洋法办事处的一艘大型船只上进行（梅尔维尔号要求的23天），随后对样品进行实验室研究，并对照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.