Tourmaline as a Petrogenetic Indicator Mineral in Metamorphic Rocks

系统地研究旅游业， 这种矿物作为岩石成因指示剂的效用在广泛的 变质岩石的范围。 实地研究将 对来自西北缅因州的样本进行了研究，其中PI已经 以变质作用为特征的条件。 具体目标包括： (1)旅游景点之间的成分关系评估 与岩石、矿物组合、T的关系; 变质历史与旅游分带模式; 利用碎屑电气石组合物指示 沉积物源;（4）沉积物组分关系 自生电气石和成岩流体。 这些研究将 也有助于更好地理解 电气石、B地球化学旋回和变质作用。

Systematic studies of tourmaline are proposed to extend the utility of this mineral as a petrogenetic indicator in a wide range of metamorphic rocks. Field-related studies will be conducted on samples from NW Maine where the PIs have already characterized conditions of metamorphism. Specific goals include: (1) assessment of compositional relations between tourmaline rims and bulk rocks, mineral assemblage, and T, (2) relations between metamorphic history and tourmaline zoning patterns, (3) utilization of compositions of detrital tourmalines to indicate sedimentary provenance, and (4) relations of compositions of authigenic tourmalines and diagenetic fluids. These studies will also lead to a better understanding of the crystal chemistry of tourmalines, geochemical cycles of B, and metamorphic processes.