Halogens and H2O in the Petrogenesis of MORB and BABB

MORB 和 BABB 岩石成因中的卤素和 H2O

• 批准号: 8917693
• 负责人: Peter Michael
• 金额: $ 8.08万
• 依托单位: University of Tulsa
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-12-15 至 1992-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8917693&HistoricalAwards=false
• 关键词: Halogens; H2O; Petrogenesis; MORB; BABB

This is a study of halogen elements and water in basalt rocks from the mid-ocean ridge system. Several questions will be addressed. Is the elevated abundance of chlorine in some basalts the result of seawater alteration of the rocks, or does the chlorine come from the earth's mantle? If alteration is the source, is the concentration related to seafloor spreading rate, tectonic associations, or crystallization depth of the basalt? Does the observed excess in chlorine relate to commonly observed excesses in some other elements? Are there regional variations in the concentration of water relative to other elements in mid-ocean ridge basalts, and if so, does this reflect mantle heterogeneity? Despite their low abundances in mid-ocean ridge basalt, these volatiles play an important role in magmatic processes with the suboceanic mantle and crust and this study of the nature and concentration of volatiles will provide crucial information about the formation and evolution of magmas at mid-ocean ridges.

这是对大洋中脊系统玄武岩中卤素元素和水的研究。 将解决几个问题。 某些玄武岩中氯含量的升高是海水侵蚀岩石的结果，还是氯来自地幔？ 如果蚀变是来源，那么浓度是否与海底扩张速率、构造关联或玄武岩的结晶深度有关？观察到的氯过量是否与常见的其他元素过量有关？ 洋中脊玄武岩中水的浓度相对于其他元素是否存在区域差异？如果有，这是否反映了地幔的异质性？ 尽管洋中脊玄武岩中的丰度较低，但这些挥发物在洋中地幔和地壳的岩浆过程中发挥着重要作用，对挥发物性质和浓度的研究将为洋中脊玄武岩的形成和演化提供重要信息。海脊。