Igneous and High Temperature Hydrothermal Alteration Mineralogies in Drill-Recovered Peridotite from the Galicia Margin, Iberian Peninsula

这是一项研究上地幔橄榄岩的原生矿物学和成分及其后续蚀变的建议。橄榄岩样本是从加利西亚边缘的ODP103航次期间获得的39.5米的钻芯剖面中获得的。这项研究将对取自岩心不同部分的约50个薄片进行岩石学和显微探针分析，重点放在中央和蚀变最少的橄榄岩上，以表征蚀变矿物学和结构，并确定残留的火成岩矿物。将进行锶同位素分析，试图确定核爆的年龄，并进一步确定岩芯的蚀变历史。将尝试通过估算蚀变组合的P-T来将这些数据合并到一个连贯的构造图景中。这样的研究对于了解大洋地壳和上地幔的构造和热演化，以及循环流体对其的渗透和改造具有重要意义。

This is a proposal to study the primary mineralogy and composition of an upper mantle peridotite and its subsequent alteration. The peridotite samples are obtained from a 39.5 meter section of drill core obtained during ODP Leg 103 at the Galicia Margin. The study will involve petrographic and microprobe analyses of approximately 50 thin sections cut from various parts of the core, focusing on the central and least altered peridotite, in order to characterize the alteration mineralogies and textures, and to determine relict igneous minerals. Sr isotopic analyses will be performed in an attempt to determine the age of implacement and to further characterize the alteration history of the core. Some attempt will be made to incorporate these data into a coherent tectonic picture by estimating the P- T of the alteration assemblages. Studies such as this are of fundamental importance to understanding the tectonic and thermal evolution of the oceanic crust and upper mantle, and its penetration and alteration by circulating fluids.