Mapping of Textural, Modal and Compositional Variations in the Shallow Mantle: Implications for the Dynamics of Melt Flow and Segregation

9418228科勒门对浅地幔橄榄岩的研究为了解熔体提取、熔体输送和变形过程提供了一个窗口。对地幔物理性质和熔体分布之间关系的野外研究提供了实验室实验、手工标本地球化学和大规模地球物理观测提供的约束之间的关键联系。这是对约瑟芬蛇绿岩和三一蛇绿岩(俄勒冈州西南部和加利福尼亚州北部)浅地幔剖面的结构、形态和成分变化的野外调查。确定橄榄岩中火成反应带的粒度、粒度分布、颗粒形状和晶体组构，结合对成分变化的详细研究，将对熔岩/岩石比、局部变形过程中的重结晶机制以及熔体通过这些反应带的性质提供限制。

9418228 Kelemen The study of shallow mantle peridotite provides a window into processes of melt extraction, melt transport, and deformation. Field studies of the relationship between physical properties of the mantle and melt distribution provide a critical link between constraints provided by laboratory experiments, hand specimen geochemistry, and large scale geophysical observations. This is a field investigation of textural, modal and compositional variation in the shallow mantle sections of the Josephine and Trinity ophiolites (SW Oregon and N California). Determination of grain size, grain size distribution, grain shape, and crystallographic fabric across igneous reaction zones in the peridotite, in combination with detailed studies of compositional variation, will provide constraints on the melt/rock ratio, mechanisms of recrystallization during localized deformation, and the nature of melt transport through these zones.