Metamorphism
just a sampling… go to Keyword Search for more!
Cordierite granulite gneiss, Greenland
Cordierite in Proterozoic granulite gneiss, south Greenland (230829-167)
Download ImageReaction rims in granulite gneiss, Greenland
Polymineralic reaction rings in Proterozoic garnet-rich granulite gneiss, southern Greenland (230829-134)
Download ImageProterozoic Castner Marble with garnets, Texas
Proterozoic Castner Marble with garnet porphyroblasts, Franklin Mountains, Texas. (100201-38))
Download Image
Archean migmatite gneiss, Wyoming (vertical)
Archean migmatite gneiss, Wind River Range, Wyoming (8Winds-33)
Download ImageDeformed metaconglomerate, Maine
Flattened cobbles in a deformed metaconglomerate, Maine (180715-76)
Download ImageFoliation in Phyllite, Tennessee
Foliation in phyllite, viewed in xz and xy planes of strain ellipsoid. Precambrian Wilhite Fm, Tennessee. (171120-72).
Download ImageSkagit Gneiss migmatite, Washington
Outcrop of Skagit Gneiss migmatite of North Cascades National Park, Washington. (150802-18)
Download ImageFeldspar porphyroclasts in Augen Gneiss
Feldspars and foliation in augen gneiss of Precambrian Blowing Rock Gneiss, North Carolina. Blue Ridge Province of Appalachian Mountains. (171118-49)
Download ImageSkagit gneiss migmatite, Washington
Migmatite of Skagit gneiss, North Cascades National Park, Washington (MG_6945)
Download ImageHand samples of metamorphic rocks
From left to right (in order of increasing grade) slate, phyllite, schist, gneiss. (Met-01)
Download ImageSerpentinite, Oregon
Serpentinite, exposed in terrane boundary fault zone near John Day, Oregon. (ID# 121229-35)
Download ImageMylonitic gneiss: top-right
Mylonitic gneiss and asymmetric porphyroclasts. In this example, shear was top-to-the-right (SrD-58).
Download ImageStretched pebble conglomerate
Ductiley deformed pebble conglomerate. Kingston Peak Formation, SE California (SrD-39).
Download Image
chlorite-rich gneiss
Retrograde metamorphism: chloritic gneiss. Note the normal faults
Download ImageTalc deposit, Death Valley, California
Talc deposit, formed by contact metamorphism at contact of mafic sill and dolomite. Proterozoic Crystal Spring Formation, Death Valley National Park, California. (Met-21)
Download ImageContact metamorphism, Montana
Contact metamorphism: calc-silicate skarn (mostly garnet) in marble. (Met-22)
Download Image
Folded gneiss.
Folded Archean gneiss, Teton Range, Wyoming. Photo is approximately 60 cm across. (5D-6313)
Download Image