Mineral compositions for metamorphosed lower crustal xenoliths, central Montana, USA

These data are mineral compositions measured by electron microprobe, presented in the 2011 publication in Contributions to Mineralogy and Petrology by Blackburn et al., and in the 2012 publication in Geochemistry, Geophysics, and Geosystems by Mahan et al. The samples are from the Sweetgrass Hills and Homestead xenolith localities in central Montana, hosted by Eocene volcanics. The mineral chemistry was analyzed as part of an effort to help constrain the age, thermal evolution, metamorphic history, and physical properties (e.g., seismic velocities) of Montana deep crust. Geochronology data for some of these samples are also presented in the Contributions to Mineralogy and Petrology publication. Another related publication with similar data for additional samples is the 2012 Lithosphere article by Barnhart et al.本数据集为通过电子探针（electron microprobe）测试获得的矿物成分数据，相关成果分别发表于Blackburn等人2011年刊载于《Contributions to Mineralogy and Petrology》（矿物学与岩石学论丛）的论文，以及Mahan等人2012年刊载于《Geochemistry, Geophysics, and Geosystems》（地球化学、地球物理学与地球系统）的论文。样品采自美国蒙大拿州中部的斯威特格拉斯丘陵（Sweetgrass Hills）与霍姆斯特德（Homestead）捕虏体（xenolith）产地，赋存于始新世（Eocene）火山岩中。本次矿物化学分析作为研究工作的一部分，旨在约束蒙大拿州深部地壳的形成年龄、热演化历程、变质历史以及物理性质（如地震波速度）。部分样品的地质年代学（Geochronology）数据也刊载于上述《Contributions to Mineralogy and Petrology》论文中。另有一篇由Barnhart等人于2012年发表在《Lithosphere》（岩石圈）上的相关论文，包含了额外样品的同类矿物成分数据。