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

赫斯深渊东太平洋海隆上地壳剖面的岩石磁性和古地磁

• 批准号: 9102533
• 负责人: James Natland
• 金额: $ 6.08万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-09-01 至 1992-02-01
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9102533&HistoricalAwards=false
• 关键词: Rock; Magnetic; Properties; Paleomagnetism; Upper

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.

尽管洋脊顶部海底扩张过程产生的线性磁异常的一般概念已经很明确，但洋脊内磁化的来源仍然不确定。 ALVIN 在赫斯深渊潜水期间获得的样本包括一系列差异化的拉斑岩喷出物、岩脉和辉长岩，代表了上辉长岩地壳层的剖面、700 m 的片状岩脉和约 300 m 的地壳枕状熔岩层序。目的是获得代表上洋地壳不同层次的不同成分的粗粒和细粒岩石的全套岩石磁性测量结果，并将其与岩石的结晶和蚀变历史以及磁性矿物的成分相结合。