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The role of stress release fracturing in the development of cavernous porosity in carbonate aquifers
Author(s) -
Sasowsky Ira D.,
White William B.
Publication year - 1994
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/94wr01727
Subject(s) - geology , electrical conduit , cave , carbonate , aquifer , karst , fracture (geology) , geomorphology , tectonics , carbonate rock , petrology , geochemistry , sedimentary rock , geotechnical engineering , paleontology , groundwater , archaeology , history , mechanical engineering , materials science , engineering , metallurgy
Stress relief fracturing provides the large mechanical apertures needed for the development of conduit porosity in carbonate aquifers. Examination of valleys incised into Mississippian age limestones throughout the Appalachian plateaus has demonstrated a consistent pattern taken in the development of conduits in these settings. Master conduits (caves) are found beneath the valley walls in general, not directly beneath the actual surface channel. Common features of the studied “Cumberland style” caves are valley‐parallel master conduit segments, exceptional concordance of conduit orientation with minor surface topographic variations, development on distinct “levels,” and development in a downdip position from master surface streams. The recognition that these conduits form along geologically young fracture systems of increased aperture is a departure from previous theories of cave origin. Prior theories have either explicitly or implicitly assumed that caves develop along joints and fractures of significant geologic age, related more to regional tectonic forces than to present‐day topographic influences.