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Barbados Ridge hydrogeologic tests: Implications for fluid migration along an active decollement

1997; Geological Society of America; Volume: 25; Issue: 3 Linguagem: Inglês

10.1130/0091-7613(1997)025 2.3.co;2

1943-2682

Elizabeth J. Screaton, A. T. Fisher, Bobb Carson, Keir Becker,

earthquake and tectonic studies

Research Article| March 01, 1997 Barbados Ridge hydrogeologic tests: Implications for fluid migration along an active decollement Elizabeth J. Screaton; Elizabeth J. Screaton 1Department of Geological Sciences, University of Colorado, Boulder, Colorado 80309 Search for other works by this author on: GSW Google Scholar Andrew T. Fisher; Andrew T. Fisher 2Earth Sciences Department, University of California, Santa Cruz, California 95064 Search for other works by this author on: GSW Google Scholar Bobb Carson; Bobb Carson 3Department of Earth and Environmental Science, Lehigh University, Bethlehem, Pennsylvania 18015 Search for other works by this author on: GSW Google Scholar Keir Becker Keir Becker 4Division of Marine Geology and Geophysics, Rosenstiel School of Marine and Atmospheric Sciences, University of Miami, Miami, Florida 33149 Search for other works by this author on: GSW Google Scholar Author and Article Information Elizabeth J. Screaton 1Department of Geological Sciences, University of Colorado, Boulder, Colorado 80309 Andrew T. Fisher 2Earth Sciences Department, University of California, Santa Cruz, California 95064 Bobb Carson 3Department of Earth and Environmental Science, Lehigh University, Bethlehem, Pennsylvania 18015 Keir Becker 4Division of Marine Geology and Geophysics, Rosenstiel School of Marine and Atmospheric Sciences, University of Miami, Miami, Florida 33149 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1997) 25 (3): 239–242. https://doi.org/10.1130/0091-7613(1997)025 2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Elizabeth J. Screaton, Andrew T. Fisher, Bobb Carson, Keir Becker; Barbados Ridge hydrogeologic tests: Implications for fluid migration along an active decollement. Geology 1997;; 25 (3): 239–242. doi: https://doi.org/10.1130/0091-7613(1997)025 2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Hydrogeologic tests were conducted at a sealed borehole penetrating the decollement of the Barbados Ridge accretionary complex. At low excess pore pressures [λ* = (Pp–Ph)/ (Pl–Ph) = 0.0 to 0.36, where Pp = pore pressure, Ph = hydrostatic pressure, and Pl = lithostatic pressure], estimated permeabilities were comparable to those of similar, unfractured sediment. These tests complement shipboard packer tests completed at higher fluid pressures (λ* = 0.5 to 1.0) during Ocean Drilling Program (ODP) Leg 156. Together, the test results suggest a 4- to 5-order-of-magnitude permeability increase as fluid pressure varied from hydrostatic (λ* = 0) to lithostatic (λ* = 1). However, unlike the results of the shipboard packer tests, the test results presented here exhibit no evidence of a relationship between permeability and pore pressure. The combined findings from the two sets of hydrogeologic tests indicate that significant permeability increases can occur within the decollement at pore pressures below lithostatic pressure. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.