Geologic units containing intrusive carbonatite

Earth material > Plutonic rock

Intrusive carbonatite

A plutonic rock composed of at least 50% carbonate minerals.

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Arkansas

Igneous rocks (Phanerozoic | Mesozoic | Cretaceous): Includes undifferentiated altered sedimentary rocks of Paleozoic age at Granite Mountain, Pulaski County, and Mufreesboro, Pike County. Acid to intermediate - Nepheline syenite complexes at Magnet Cove and Potash Sulfur Springs, stocks at Granite Mtn., explosion breccias, and dikes and sills (principally trachyte,tinguaite, phonolite, some ranging from syenite to diabase.) Basic to ultrabasic - Lamproite pipes (Murfreesboro, Pike County) and dikes and sills (principally lamprophyres of fourchite, ouachitite, and monchiquite)

New Jersey

Ouachitite breccia (Early Silurian? and Late Ordovician): Ouachitite breccia - Medium-dark-gray, fine-grained ouachitite (olivine-free biotite lamprophyre) containing pebble- to cobble-size xenoliths of Middle Proterozoic rock, dolomite of the Kittatinny Supergroup(?), the Martinsburg Formation, and autoliths of potassic syenite, lamprophyre, and carbonatite. Found in numerous diatremes in the Beemerville area; largest of at Rutan Hill.

Vermont

Ultramafic Rocks (Ordovician): Ultramafic Rocks - Serpentinite, carbonate rock, talc-carbonate rocks and steatite.