{"thcode":4,"term":{"code":"4.5","name":"Gabbroid","parent":"4","scope":"A plutonic rock with Q < 20% or F < 10%, P\/(A+P) > 65%, and pl\/(pl+px+ol) between 10 and 90%."},"uf":[],"bt":[{"code":"4","name":"Plutonic rock","parent":"0","scope":"A rock formed at considerable depth by crystallization of magma and\/or by chemical alteration.  It is characteristically medium- to coarse-grained, of granitoid texture."},{"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":[{"code":"4.5.5","name":"Anorthosite","parent":"4.5","scope":"A plutonic rock defined in the QAPF diagram as having Q between 0 and 5, P\/(A+P) greater than 90, and M less than 10.  A group of monomineralogic plutonic igneous rocks composed almost entirely of plagioclase feldspar..."},{"code":"4.5.4","name":"Gabbro","parent":"4.5","scope":"A plutonic rock defined in the QAPF diagram as having Q between 0 and 5% or F\/(F+A+P) < 10%, P\/(A+P) greater than 90% and plagioclase more calcic than An50"},{"code":"4.5.2","name":"Monzogabbro","parent":"4.5","scope":"A plutonic rock defined in the QAPF diagram as having Q < 5% or F\/(F+A+P) < 10%, and P\/(A+P) between 65 and 90%, and plagioclase more calcic than An50 "},{"code":"4.5.3","name":"Quartz gabbro","parent":"4.5","scope":"A plutonic rock defined in the QAPF diagram as having Q between 5 and 20%, P\/(A+P) > 90%, and plagioclase more calcic than An50"},{"code":"4.5.1","name":"Quartz monzogabbro","parent":"4.5","scope":"A plutonic rock defined in the QAPF diagram as having Q between 5 and 20% and P\/(A+P) between 65 and 90%, and plagioclase more calcic than An50 "}],"rt":[]}