Primitive Mafic Magmas of the Central Andes

9508023 Kay了解安第斯山脉中部岩浆源区的最大障碍之一是缺乏来自原始地幔玄武岩的化学限制。 对这类玄武岩的分析被吹捧为取得进展的必要成分。 在此框架内，最近发现的两个更新世原始玄武质熔岩是非常有意义的。 该项目的主要目标是收集和“完全”分析一套出露在南部中央火山带的基性熔岩。 智利和阿根廷机构与南美同事Mpodozis和Coira合作，正在支持绘图和取样。 “全面”分析是指通过INAA、ICP-MS、XRF和微探针技术以及Pb、Nd和Sr同位素测定各种主要和微量元素。 这些分析将填补弧中原始镁铁质熔岩汇编中的一个重要空白，并为开始解开加厚的安第斯地壳下发生的复杂地幔过程提供基础。

9508023 Kay One of the big stumbling blocks in understanding Central Andean magmatic source regions has been the lack of chemical constraints from primitive, mantle-derived basalt. Analyses from basalts of this type have been touted as the required ingredient in making progress. Within this framework, the recent discovery of two Pleistocene primitive basaltic lavas is extremely significant. The major objective of this project is to collect and "completely" analyses a suite of the mafic lavas outcropping in the southern Central Volcanic Zone. Mapping and sampling is being supported by Chilean and Argentine agencies in collaboration with South American colleagues Mpodozis and Coira. A "complete" analyses means determining a full range of major and trace element by INAA, ICP-MS, XRF and microprobe techniques, as well as Pb, Nd and Sr isotopes. These analyses will fill an important gap in compilations of primitive mafic lavas in arcs and provide a basis for beginning to unravel the complex mantle processes occurring beneath the thickened Andean Crust.