Collaborative Research: Chemical Geodynamics of the Galapagos Mantle Plume-Spreading Center System

这是与 GEOMAR 的德国科学家合作进行的一项研究，是 2001 年在 R/V Sonne 上进行的 MEGAPRINT 探险的一部分。该实地计划对加拉帕戈斯传播中心 (GSC) 东部关键的、未绘制地图的部分以及群岛和传播中心之间的年轻海底部分进行了采样。该计划的内容包括多波束海底测绘、船上重力和磁力勘测，以及通过沿 GSC 东部以约 15 公里的间距以及在许多离轴海山和火山脊处疏浚熔岩取样。在已完成的约 100 个主要元素玻璃分析的指导下，PI 提出了一项分析计划，该计划将确定这些海底玻璃和岩石的代表性套件的微量元素含量、He、Pb、Nd、Sr 和 Hf 同位素组成、挥发物（CO2、H2O、Cl、F 和 S）含量以及 40Ar-39Ar 辐射年龄。来自德国同事的地球物理数据将为地壳和岩石圈的年龄、结构、厚度和构造提供额外的限制。

This is a collaborative study with German scientists from GEOMAR, as part of the MEGAPRINT expedition that took place aboard the R/V Sonne during 2001. The field program sampled critical, unmapped sections of the eastern Galapagos Spreading Center (GSC) and portions of young seafloor between the archipelago and the spreading center. Elements of the program included multi-beam seafloor mapping, shipboard gravity and magnetic surveys, and sampling of lavas by dredging at ~15 km spacing along the eastern GSC, and at numerous off-axis seamounts and volcanic ridges. Guided by ~100 major element glass analyses already completed, the PIs propose an analytical program that will determine trace element contents, He, Pb, Nd, Sr and Hf isotope compositions, volatile (CO2 ,H2O, Cl, F and S) contents and 40Ar-39Ar radiometric ages of a representative suite of these submarine glasses and rocks. Geophysical data from German colleagues will provide additional constraints on age, structure, thickness and tectonics of the crust and lithosphere.