{"thcode":4,"term":{"code":"5.3.3.1","name":"Metabasalt","parent":"5.3.3","scope":"A low-grade, mafic metavolcanic rock with preserved evidence of its original basaltic character"},"uf":[],"bt":[{"code":"5.3.3","name":"Mafic metavolcanic rock","parent":"5.3","scope":"A metavolcanic rock having abundant dark-colored minerals, typically feldspar, amphibole, and\/or pyroxene"},{"code":"5.3","name":"Metavolcanic rock","parent":"5","scope":"A volcanic rock that shows evidence of having been subjected to metamorphism."},{"code":"5","name":"Metamorphic rock","parent":"0","scope":"A rock derived from pre-existing rocks by mineralogical, chemical, and\/or structural changes, essentially in the solid state, in response to marked changes in temperature, pressure, shearing stress, and chemical environment, generally at depth in the earth's crust."},{"code":"0","name":"Earth material","parent":null,"scope":"Geologic map unit classification (Bruce R. Johnson) version 6.2: A hierarchical classification of earth materials for digital geologic maps."}],"nt":[],"rt":[]}