stripes
Occurrence number:
174-00-144
Country:
United States
Region:
North Carolina
Location:
Longitude: -77.65, Latitude: 35.68
Carbonatite:
No
A metamorphosed, peralkaline granite is exposed in a quarry 0.8 km southeast of the town of Fountain. Dykes of amphibolite, metarhyolite and basalt cut the granite, which is foliated. It consists of quartz, albite, microcline, aegirine (5.4%), sodic amphibole (4.1%), magnetite, fluorite and calcite with traces of bafertisite. The amphiboles apparently vary from ferroeckermannite and ferrorichterite to arfvedsonite and riebeckite. Rock and mineral analyses are available.
Economic:
Crushed stone is produced from the quarry.
Age:
K-Ar age determinations on microcline and albite gave 257 ±5 and 292 ±6 Ma, whereas a five-point Rb-Sr 'scatterchron' gave 531 ±60 Ma (Mauger et al., 1983, Table 9 and Fig. 6).
References:
MAUGER, R.L., SPRUILL, R.K., CHRISTOPHER, M.T. and SHAFIQULLAH, M. 1983. Petrology and geochronology of peralkalic metagranite and metarhyolite dikes, Fountain Quarry, Pitt County, North Carolina. Southeastern Geology, 24: 67-89
Location: