{"thcode":4,"term":{"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"},"uf":[],"bt":[{"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%."},{"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":[],"rt":[]}