Middle Proterozoic diabase (AZYd;0)

State	Arizona
Name	Middle Proterozoic diabase
Geologic age	Middle Proterozoic
Original map label	Yd
Comments	~ 1.1 Ga. Associated with Grand Canyon Supergroup, and Apache Group (unit Ys)
Primary rock type	diabase
Secondary rock type
Other rock types	anorthosite; aplite; troctolite; pegmatite; syenite
Lithologic constituents	Major Igneous > Plutonic > Gabbroic > Gabbro (Dike or sill)diabase Igneous > Hypabyssal > Mafic-hypabyssal > Hypabyssal-basalt (Dike or sill)diabase Incidental Igneous > Plutonic > Gabbroic > Gabbro > Troctolite (Dike or sill)microtroctolite Igneous > Plutonic > Syenitic > Syenite (Dike or sill) Igneous > Plutonic > Granitic > Leucocratic-granitic > Pegmatite (Dike or sill) Igneous > Plutonic > Granitic > Leucocratic-granitic > Aplite (Dike or sill) Igneous > Plutonic > Anorthosite (Dike or sill)
Map references	Richard, S. M., Reynolds, S.J., Spencer, J. E., and Pearthree, P. A., 2000, Geologic Map of Arizona: Arizona Geological Survey Map 35, 1 sheet, scale 1:1,000,000.
Unit references	Richard, S. M., Reynolds, S.J., Spencer, J. E., and Pearthree, P. A., 2000, Geologic Map of Arizona: Arizona Geological Survey Map 35, 1 sheet, scale 1:1,000,000. Elston, D.P., 1989, Grand Canyon Supergroup, northern Arizona: statigraphic summary and preliminary paleomagnetic correlations with parts of other North American Proterozoic successions, in Jenney, J.P., and Reynolds, S.J., editors, Geologi Wrucke, C.T., 1989, The Middle Proterozoic Apache Group, Troy Quartzite, and associated diabase of Arizona, in Jenney, J.P., and Reynolds, S.J., editors, Geologic evolution of Arizona: Arizona Geological Society Digest 17, p. 239-258.
Geographic coverage	Gila - Graham - Maricopa - Navajo - Pinal