Tourmaline in Metamorphic Rocks: Polar Asymmetry, Episodic Growth and Petrogenesis

[405747 .亨利]拟议的研究将探讨电气石作为其所在岩石变质史监测物的作用。该研究有三个岩石学和地球化学目标：(1)评估电气石极性性质的后果和意义——这可能有助于深入了解受表面能效应影响的元素分配；(2)研究变质环境中B的零星释放及其对电气石生长的意义——这将对理解火成岩和变质岩中的B循环至关重要；(3)确立了变质流体对高品位变质岩中电气石发育或丢失的意义，这有助于阐明流体化学与矿物化学和结构的关系。将研究缅因州西北部的变质岩样品。这项研究将需要对电气石进行电子和离子探针分析。

9405747 Henry The proposed research will address the role of tourmaline as a monitor of the metamorphic history of the rocks in which it occurs. The study has three petrologic and geochemical objectives: (1) evaluation of consequences and significance of the polar nature of tourmaline - which may give insights into element partitioning as influenced by surface energy effects, (2) investigation of the sporadic release of B in metamorphic environments and its significance to tourmaline growth - which will be critical in understanding the B cycle in igneous and metamorphic rocks, and (3) establishment of the significance of development or loss of tourmaline in high grade metamorphic rocks due to metamorphic fluids - which may elucidate the chemistry of fluids as it related to mineral chemistry and texture. Metamorphic samples from NW Maine will be studied. The research will require electron and ion probe analyses of tourmaline.