Collaborative Research: Structure and Composition of Fast-Spread EPR (East Pacific Rise) Oceanic Crust Exposed at Pito Deep

摘要：在本次合作调查中，将对位于EPR上复活节微板块东北边缘的皮托深的主要裂谷断裂带进行巢状尺度的调查和采样。沿着复活节微板块的东北边缘，主要的断层陡坡包围着一个正在扩展的裂谷，以直角切割了深海山丘的轮廓和磁异常，形成了海洋地壳的自然横截面。露头区域将使用DSL-120侧扫声纳定位，并使用ALVIN和Jason II进行观测。这项研究的基本原理是扩大对上洋地壳内部结构和组成的认识，并由此推断出超快速扩张脊的过程。

AbstractIn this collaborative investigation, a nested-scale survey of major rift escarpments that expose the upper oceanic crust at Pito Deep, located on the northeast edge of the Easter microplate on the EPR will be surveyed and sampled. Major fault scarps bounding a propagating rift along the NE edge of the Easter Microplate cut abyssal hill lineaments and magnetic anomalies at right angles creating a natural cross section of the oceanic crust. Outcrop areas would be located using DSL-120 sidescan sonar, and observed using ALVIN and Jason II. The rationale for this investigation is to extend knowledge of the internal structure and composition of the upper oceanic crust, and by inference, processes at superfast spreading ridges.