Collaborative Research: An Investigation into Relative Noble Gas Fractionation during Mantle Melting: Constraints from the Southeast Indian Ridge

该奖项是为了测量来自东南印度海脊(SEIR)的阶梯粉碎的玄武岩淬火玻璃上的He、Ne、Ar稀有气体和二氧化碳的含量，以研究稀有气体在地幔中的分馏情况，这是了解地幔熔体提取和挥发运输所必需的知识。这项工作还将研究地幔40Ar/36Ar的不均一性，可能是由于大气Ar的诱导，还将研究所谓的He悖论，即母质来自地球深处的熔体样品(以高3He/4He为特征，并与地幔热柱有关)具有低的He丰度，以及He通量似乎与来自地幔的热通量(以岩浆产生为代表)无关。选择了来自东南印度洋海脊的样品进行研究，因为它们的成分在远离阿姆斯特丹-圣彼得堡的地方表现出了平滑的变化。与海脊轴向深度变化相吻合的保罗地幔热柱。因此，这些样品代表了一套独特的样品，用于研究通过作用于扩张脊下的地幔过程的深地幔热柱对海底地幔惰性气体系统学的影响。

Award is for measuring He, Ne, and Ar noble gases and CO2 content on step-crushed basaltie quench glasses from the Southeast Indian Ridge (SEIR) to examine how noble gases fractionate in the mantle, knowledge essential to understanding mantle melt extraction and volatile transport. This work will also examine heterogeneity in mantle 40 Ar/36 Ar, possibly arising from suduction of atmospheric Ar, and will also investigte the so-called He-paradox, wherey melt samples whose parental material originated from deep within the earth (characterized by high 3He/4He and associated with mantle plumes) have low He abundances, as well as the He flux seemingly having little to do with heat flux from the mantle (as represented by magma production). Samples from the Southeast Indian Ridge have been chosen for the study as they show smooth variation in composition away from the Amsterdam-St. Paul mantle plume that coincides with changes in ridge axial depth. These samples therefore represent a unique sample set to examine the influene on sub-oceanic mantle noble gas systematics by a deep mantle plume acting on the mantle processes underneath a spreading ridge.