Three Dimensional Mantle Heterogeneity and Melting at Superfast Spreading: Off-Axis Volcanism Near the EPR: 15-19oS

三维地幔异质性和超快扩散熔融：EPR 附近的离轴火山活动：15-19oS

• 批准号: 9503426
• 负责人: John Sinton
• 金额: $ 14.38万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-12-01 至 1999-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9503426&HistoricalAwards=false
• 关键词: Three; Dimensional; Mantle; Heterogeneity; Melting

9503426 Sinton The East Pacific Rise from 15-19 S is the fastest spreading of all the ocean ridges. This is also an area of extensive volcanism on the flanks of the ocean ridge, which is evident from strings of seamounts that stretch northwest from the ridge axis. The investigators plan to analyze rocks that are already in hand to determine their major and trace element chemical compositions and to measure selected isotope ratios. The major and trace elements will be used to determine when and where melting occurs in the mantle by inferring conditions and depths of melting. The isotope ratios will be used to identify the location and longevity of chemical heterogeneities in the mantle. This project is in the same area and is related to the large seismic experiment called MELT which intends to determine the distribution of melting in the mantle, and the two projects complement each other. ***

小行星9503426辛顿 南纬15-19度的东太平洋海隆是所有洋脊中扩张最快的。 这也是大洋中脊两侧的一个广泛火山活动区，从山脊轴向西北延伸的海山串可以明显看出。 研究人员计划分析已经掌握的岩石，以确定其主要和微量元素的化学成分，并测量选定的同位素比率。 主量元素和微量元素将用于通过推断熔融条件和熔融深度来确定地幔熔融的时间和地点。 同位素比值将用于确定地幔中化学不均匀性的位置和寿命。 该项目位于同一地区，与旨在确定地幔熔融分布的大型地震实验MELT有关，两个项目相辅相成。 ***