By WOODS KAREN M
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Extra info for Physical Geology Laboratory Manual (Fourth Edition)
Example text
Immediately adjacent to the intrusion, hornfels, a contact metamorphic rock, may form from shales even under dry conditions. Garnet and pyroxene, amphibole, epidote, chlorite, and serpentine (in order of increasing distance from the heat source) are mineral phases that may form in shale. Limestone will metamorphose into marble at medium-grade metamorphic conditions and melt at higher temperatures nearest the intrusion. Quartz sandstone metamorphoses into quartzite at medium-grade metamorphism and will also melt at the higher temperatures closest to the intrusion.
When the minerals of a metamorphic rock are arranged in a nearly planar (parallel) orientation, not necessarily flat, but wavy, they have a foliated texture. The following foliated textures are a result of the reaction of fine-grained material (clays and silt) to increasing heat and pressure. 1. Slaty cleavage refers to the breakage characteristics of slates parallel to the alignment of fine-grained materials in a planar and parallel fashion. Slaty cleavage is a low-grade metamorphic texture. , may metamorphose into slate.
May metamorphose into slate. 2. Phyllitic texture refers to a slightly wavy to subparallel arrangement of submicroscopic sheet silicate minerals, mostly very fine-grained chlorite and/or muscovite. Rocks with this texture commonly have a pearly or satiny luster. Phyllitic texture is the result of low- to medium-grade metamorphism. Slate may metamorphose into phyllite. 3. Schistose texture refers to parallel to subparallel orientation of macroscopic sheet silicate minerals in metamorphic rocks.