Processes of Garnet Nucleation, Growth and Dissolution with Progressive Metamorphism

9508104 Spear本研究涉及对具有各种P-T历史的区域变质岩石中变质斑晶的成核和生长过程的系统分析。 主要目的是研究石榴石的成核，生长和故障的过程中，随着变质程度的增加，从第一次出现的石榴石内的石榴石区的共存的石榴石和十字石内的较低的十字石区的发生。 研究将集中在从新罕布什尔州西部、佛蒙特州东部和纽约-马萨诸塞州-康涅狄格州三州地区附近的塔科尼克山脉收集的一套样本上。 对于每个样品，将确定所选岩石体积内每个石榴石的三维空间分布、粒度分布和成分分区数据。 这项研究将是第一个系统的研究，以测试的想法，石榴石成核和生长过程可能会随着变质等级和P-T历史。

9508104 Spear This study involves a systematic analysis of nucleation and growth processes of metamorphic porphyroblasts in regionally metamorphosed rocks with a wide variety of P-T histories. The primary goal is to examine the processes of garnet nucleation, growth and breakdown with increasing metamorphic grade from the first occurrence of garnet within the garnet zone to the occurrence of coexisting garnet and staurolite within the lower staurolite zone. Research will focus on a suite of samples collected from western New Hampshire, eastern Vermont, and the Taconic Mountains near the NY- MA-CT tri-state area. For each sample, data on the 3-dimensional spatial distribution, size distribution and compositional zoning will be determined for every garnet within the chosen volume of rock. The proposed study will be among the first systematic studies to test the idea that garnet nucleation and growth processes may vary with metamorphic grade and P-T history.