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Alkalic and mafic rocks in small plutons, and diabase and gabbro dikes

Alkalic and mafic rocks in small plutons, and diabase and gabbro dikes
StateColorado
NameAlkalic and mafic rocks in small plutons, and diabase and gabbro dikes
Geologic ageProterozoic | Mesoproterozoic
Original map labelYam
Primary rock typegranitoid
Secondary rock typediabase
Other rock typesgabbro
Lithologic constituents
Major
Igneous > Hypabyssal > Mafic-hypabyssal > Hypabyssal-mafic-alkaline
Igneous > Hypabyssal > Mafic-hypabyssaldiabase
Incidental
Igneous > Plutonic > Dioritic (Dike or sill)diabase
Igneous > Plutonic > Gabbroic > Gabbro (Dike or sill)
Map references
Tweto, Ogden 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000.
Unit references
Tweto, Ogden 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000.
Geographic coverageGunnison - Hinsdale - La Plata

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URL: http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=COYam;0
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