Igneous > Plutonic > Foidal-syenitic > Nepheline-syenite (Stock or pipe)
Igneous > Volcanic > Alkalic-volcanic (Dike or sill)
Igneous > Plutonic > Intrusive-carbonatite (Stock or pipe)The carbonatite complexes have yielded a vareity of commodities including:magnetite (iron), titanium, rare earths, molybdenum, uranium, barite and phosphate. Magnet Cove is known to mineral collectors for an unusual variety of mineral species.
Igneous > Hypabyssal > Lamprophyre (Stock or pipe)
Igneous > Plutonic > Syenitic > Syenite (Stock or pipe)
Igneous > Volcanic > Felsic-volcanic > Trachyte (Dike or sill)
|Comments||Alkalic ring dike igneous complexes: Magnet Cove (Hot Spring County)-core of carbonatite-ijolite, inner ring of alkalic extrusives and outer ring of nepheline syenite; Potash Sulfur Springs (Garland County)-mafic alkalic rocks, carbonatite, nepheline syenite and syenite. Both intruded during Mesozoic time into Paleozoic shale, sandstone and novaculite.|
Haley, B.R., Glick, E.E., Bush, W.V.; Clardy, B.F.; Stone, C.G.; Woodward, M.B., and Zachry, D.L., 1993, Geologic Map of Arkansas: U.S.Geological Survey Special Geologic Map, scale 1:500,000.
|Counties||Garland - Hot Spring - Pike - Pulaski - Saline|