Blueschist (pronounced /ˈbluːʃɪst/) is a rock that forms by the metamorphism of basalt and rocks with similar composition at high pressures and low...
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en.wikipedia.org/wiki/Blueschist
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Since the dominant mineral is usually calcite, this rock fizzes in acid. Marble often has little wavy cracks in it called stylolites. Intermediate to high grade Metabasalt is metamorphosed basalt!
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www.windows.ucar.edu/tour/link=/earth/geology/meta_nonf...
www.windows.ucar.edu/tour/link=/earth/geology/meta_nonfoliated.html&edu=high
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Metagraywacke - metamorphosed graywacke or "dirty sandstone". Finer grained than basalt, which it may superficially resemble. This rock forms through contact metamorphism. The parent rock is commonly siltstone or basalt, but may be other types of rock.
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facstaff.gpc.edu/~pgore/geology/geo101/meta.htm
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Geology question: What is metamorphosed basalt? Metamorphism is when a rock of any particular composition get heated and put under pressure such that it...
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wiki.answers.com/Q/What_is_metamorphosed_basalt
wiki.answers.com/Q/What_is_metamorphosed_basalt
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These are dikes of metamorphosed basalt that intruded the granite during the breakup of the supercontinent Rodinia in the Neoproterozoic era of geologic time.
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nvcc.edu/home/cbentley/geoblog/labels/basalt.html
nvcc.edu/home/cbentley/geoblog/labels/basalt.html
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A selection of articles related to Basalt - Metamorphism of basalts Basalts are important rocks within metamorphic belts, as their can provide vital...
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www.experiencefestival.com/basalt_-_metamorphism_of_bas...
www.experiencefestival.com/basalt_-_metamorphism_of_basalts
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Vanadiferous zincian-chromian hercynite in a metamorphosed basalt-hosted alteration zone, Atik Lake, Manitoba. Louis R. Bernier. McGill Univ., Dep. Geol.
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canmin.geoscienceworld.org/cgi/content/abstract/28/1/37
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Blue Ridge to the west is underlain by Late Proterozoic Catoctin Formation which is comprised of massive 575 million year old basalt metamorphosed to greenstone in the Middle Paleozoic. Blue Ridge forms the provincial boundary with the Great Valley of the Valley and Ridge province.
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vulcan.wr.usgs.gov/LivingWith/VolcanicPast/Places/volca...
vulcan.wr.usgs.gov/LivingWith/VolcanicPast/Places/volcanic_past_appalachians.html
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The lavas record a wide range of K-Ar ages, 85 Ma for a metabasalt with trace-element signatures of mid-ocean ridge basalt, 71 Ma for a highly metamorphosed alkalic basalt, and 39 Ma for a fresh glassy boninite. These ages imply multiple volcanic events and at least two tectonic settings for magma genesis.
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geology.geoscienceworld.org/cgi/content/abstract/19/8/8...
geology.geoscienceworld.org/cgi/content/abstract/19/8/811
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