Blue Ridge province - The Geology of Virginia
 
    
H O R N B L E N D E   G A B B R O

Hornblende gabbro exposed near the Rapidan River, Madison County

Hornblende gabbro exposed near the Rapidan River, Madison County. Hornblende gabbros occur as dikes and sills that intrude Proterozoic basement rock and Neoproterozoic metasedimentary rocks in the eastern Blue Ridge province. Recent geochronologic studies suggest these hornblende gabbros may be 700 million years old.

 
 

APPALACHIAN PLATEAU | VALLEY & RIDGE | BLUE RIDGE | PIEDMONT | COASTAL PLAIN
 

(2/20/2000)