Brevard Faultzone

Posted by Vidal Dias on

What is a fault?

"A fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements." 

The Brevard Fault Zone, also known as the Brevard Zone of Cataclasis, is a significant geologic feature of the Southeast United States, running southwest-northeast across Alabama, Georgia, and North Carolina.

My colleagues continue to dispute the structure and importance of the Brevard fault and the type and direction of ancient activity on the fault.

The Brevard Fault Zone is a 434.96-mile fault that runs from the North Carolina-Virginia border to the north metro Atlanta area and terminates near Montgomery, Alabama. It is a significant Paleozoic period structure in the Appalachian Mountains' uplift.

It is part of a much more comprehensive system of faults near the foot of the Appalachian thrust sheet that played a significant role in the Appalachian Mountains' elevation. 

The Brevard Fault has gone through several stages of deformation with only slight stratigraphic displacement. Mylonites, button schists, and gneisses are among the rocks in the Brevard zone that are heavily sheared and fractured. The geography of the Brevard Zone contains rhythmically-spaced parallel ridges that regulate most of the Chattahoochee River's flow.

The presence of mylonitic and phyllotactic rocks indicates that the Fault Zone is ductile.

This backpack design was inspired by this fault and the remarkable rocks that surround it. 

 

Sources: 

Szabo, M.W., Osborne, E.W., Copeland, C.W. Jr., and Neathery, T.L., 1988, Geologic Map of Alabama, Geological Survey of Alabama Special Map 220, scale 1:250,000.
lain Vauchez (1987). "Brevard fault zone, southern Appalachians: A medium-angle, dextral, Alleghanian shear zone"

GEORGIA GEOLOGICAL SURVEY BULLETIN 77