Petrological Investigation of Manus Back-Arc Basin Lavas

这是一个继续分析从马努斯盆地挖来的岩石的项目，马努斯盆地是已知扩张最快的弧后盆地。最初的建议强调构造构造的定义（SeaMARC II），以及样品收集和初步分析。野外项目取得了成功，初步岩石学分析表明，马努斯盆地熔岩分为MORB型和钙碱性（CA）两类。支持进行许多标准的地球化学分析（玻璃，矿物，全岩XRF，各种同位素，挥发物），以及岩石学建模。各种分析都将在同一样品上进行。希望能解决一些有关分馏控制、来源范围、过渡性熔岩的起源、喷发熔岩与构造环境的关系等问题。许多单独的分析将由其他人来完成，而项目不需要任何成本。PI将作为总协调员。这个项目很重要，因为它将提供关于小地理区域岩石化学变异起源的新信息。

This is a project to continue analyses of rocks dredged from the Manus Basin, the fastest spreading back-arc basin known. The original proposal emphasized defining the tectonic structure (SeaMARC II), and sample collection together with preliminary analyses. The field program was successful, and the preliminary petrological analyses indicate that the Manus Basin lavas form two groups--a MORB type and a calc-alkaline type (CA). Support is provided to do a number of standard geochemical analyses (glass, minerals, whole-rock XRF, a variety of isotopes, volatiles), along with petrologic modeling. The various analyses will all be done on the same samples. Hope is to address a number of questions concerning fractionation controls, range of sources, origin of transitional lavas, relation of erupted lavas to tectonic setting, etc. Many of the individual analyses are to be done by others at no cost to project. The PI is to act as overall coordinator. This project is important because it will provide new information on the origin of chemical variability of rocks from a small geographic area.