Halogens and H2O in the Petrogenesis of MORB and BABB

这是对大洋中脊系玄武岩中卤素元素和水的研究。有几个问题将会得到解答。一些玄武岩中氯的丰度升高是海水改变岩石的结果，还是氯来自地幔？如果蚀变是来源，浓度是否与海底扩张速度、构造组合或玄武岩的结晶深度有关？观察到的氯过量是否与通常观察到的某些其他元素的过量有关？大洋中脊玄武岩中的水相对于其他元素的浓度是否存在区域差异，如果是的话，这是否反映了地幔的不均一性？尽管这些挥发分在大洋中脊玄武岩中的丰度很低，但它们在与洋底地幔和地壳的岩浆作用过程中发挥着重要作用，对挥发分的性质和浓度的研究将为大洋中脊岩浆的形成和演化提供重要信息。

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.