Rock Magnetic Properties and Paleomagnetism of Upper CrustalSections of the East Pacific Rise at Hess Deep

尽管海脊海底扩张过程产生的线性磁异常的一般概念已经确立，但海脊内的磁化强度的来源仍然不确定。在赫斯深海阿尔文潜水期间获得的样品包括一系列不同的拉斑玄武岩挤出物、代表上部辉长岩地壳层的岩脉和辉长岩、700米的席状岩脉和大约300米的地壳枕状熔岩序列。其目的是获得对不同成分的粗粒和细粒岩石的全套岩石磁学测量，这些岩石代表了上层洋壳的不同水平，并将这些测量与岩石的结晶和蚀变历史以及磁性矿物的组成相结合。

Although the general concept of linear magnetic anomalies generated by seafloor spreading processes at the ridge crest is well established, the source of the magnetization within the ocean crest remains uncertain. Samples obtained during ALVIN dives in the Hess Deep comprise a range of differentiated tholeiitic extrusives, dikes and gabbros that represent a section through the upper gabbroic crustal layer, 700 m of sheeted dikes, and about 300 m of crustal pillow.lava sequence. The intention is to acquire a full suite of rock magnetic measurements on coarse and fine.grained rocks of different compositions, representing different levels of the upper ocean crust, and integrate these with the crystallization and alteration histories of the rocks, as well as the compositions of magnetic minerals.