Petrological Investigation of Manus Back-Arc Basin Lavas

这是一个项目，继续分析岩石疏浚， 马努斯盆地，已知扩张最快的弧后盆地。 的 最初的建议强调定义构造结构 （SeaMARC II），以及样本采集和初步 分析。 现场项目是成功的，初步的 岩石学分析表明马努斯盆地熔岩形成于 MORB型和钙碱性（CA）型两大类。支持是 用于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）， 沿着岩石学建模。各种分析都将 在相同的样品上进行。 希望能解决一些 关于分馏控制、来源范围 过渡熔岩的起源，喷发熔岩与 构造环境等。许多个别分析将是 由其他人在没有成本的项目。 PI将作为 总协调员。 这个项目很重要，因为它将 提供了关于化学变异性起源的新信息， 一个小的地理区域的岩石。

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.