In areas where hydrologic complexities are found, salt dissolution
may be irregular and complex. Focused dissolution may remove salt
from one small area and leave it intact in an adjacent area. In cross
section focused dissolution and collapse results in steeper-than-regional
dips and irregular unit thickness. Focused dissolution and irregular
subsidence favors creation of abundant and potentially well-connected
fracture systems (Goldstein and Collins, 1984; Collins and Luneau,
1986). Thicker intervals of permeable residue strata and more fracturing
will focus flow and propagate further irregular dissolution patterns.
the Palo Duro Basin, cored collapse breccia (a) from the floor of
a small cavern, DOE Stone and Webster Sawyer core, 446 ft below datum.
Strata overlying a large cavern collapse breccia have been fractured
(b). These fabrics are interpreted as a result of formation and subsequent
collapse of natural caverns in the salt in an area of complex salt
dissolution over a structural positive in the Rolling Plains, an area
of recognized salt-dissolution collapse (Baumgardner and others, 1982).