Condit, C., Mahan, K., Ault, A., Flowers, R. 2019. Silicate mineral compositions for metamorphic schist and amphibolite, northern Madison Range, southwestern Montana, Version 1.0. Interdisciplinary Earth Data Alliance (IEDA). https://doi.org/10.1594/IEDA/111272.
Silicate mineral compositions for metamorphic schist and amphibolite, northern Madison Range, southwestern Montana
These data are mineral compositions measured by electron microprobe, presented in the 2015 publication in Lithosphere by Condit et al. Two samples of Bear Basin schist (GP7c and GP7f) and one mafic dike sample (AA09-61) were targeted to help constrain conditions and timing of metamorphism and deformation in the Gallatin Peak terrane of the northern Madison Range, southwestern Montana. The Bear Basin schist was sampled in a pelitic horizon because the mineral assemblages are amenable to quantitative thermobarometry and monazite geochronology. The mafic dikes were targeted because they represent the youngest metamorphosed and deformed intrusive units in the study area. Pressure and temperature (P-T) equilibrium conditions calculated from all three samples constrain representative metamorphic conditions in the northwest portion of the Gallatin Peak terrane. Geochronology data for these samples is also presented in the Lithosphere publication.
Coverage Scope: Regional (Continents, Oceans)
Geographic Location: Northern Madison Range, SW Montana
Cailey B. Condit, Kevin H. Mahan, Alexis K. Ault, and Rebecca M. Flowers, (2015), "Foreland-directed propagation of high-grade tectonism in the deep roots of a Paleoproterozoic collisional orogen, SW Montana, USA." Lithosphere, 7(6): 625-645.
User Contributed Keyword(s):
garnet, hornblende, plagioclase, Montana, mafic dike
National Science Foundation: 1252295
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