Special Papers, Issues 128-129Society, 1969 - Geology |
Contents
Abstract | 1 |
Plot of minor elements in biotite gneisses | 5 |
Regional geology | 9 |
Copyright | |
13 other sections not shown
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Common terms and phrases
albite almandine amphibolite andalusite axes Central City Central City area Central City quadrangle Central City-Nederland area central surface chemical analyses chemical composition compositional band cordierite cordierite rocks cordierite-bearing biotite gneiss cordierite-bearing gneisses cordierite-gedrite-biotite gneiss Creek Cummingtonite curvature deformation diagram equilibrium feldspar-bearing cordierite-biotite gneiss fiducial plane fiducial surface Figure forms Front Range gabbro gedrite gedrite-bearing gneiss garnet grains hornblende ilmenite included indicate interlayered iron J. C. Hamilton K₂O lacking potassic feldspar layers line of striction mafic magnesium magnetite metamorphic rocks microcline mineral assemblages minor elements Morrison area muscovite Na₂O Nederland orientation oxides parallel pegmatite phases plagioclase poikilitic porphyroblasts potassic feldspar-bearing cordierite-biotite Precambrian quartz ratios Refractive rigid sphere rock type Rosenfeld rotated garnets rotational axis samples schistosity schists Semiquantitative spectrographic analyses sillimanite sillimanitic biotite gneisses simple shear Sims and Gable spinel staurolite symmetry synclastic Table TiO2 weight percent X X X X X X zone