Diagenetic evidence for massive evaporite dissolution, fluid flow, and mass transfer in the Louisiana Gulf Coast

Abstract

Research Article| August 01, 1993 Diagenetic evidence for massive evaporite dissolution, fluid flow, and mass transfer in the Louisiana Gulf Coast Kathleen M. McManus; Kathleen M. McManus 1Department of Geology and Geophysics, Louisiana State University, Baton Rouge, Louisiana 70803 Search for other works by this author on: GSW Google Scholar Jeffrey S. Hanor Jeffrey S. Hanor 1Department of Geology and Geophysics, Louisiana State University, Baton Rouge, Louisiana 70803 Search for other works by this author on: GSW Google Scholar Geology (1993) 21 (8): 727–730. https://doi.org/10.1130/0091-7613(1993)021<0727:DEFMED>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 MailTo Tools Icon Tools Get Permissions Search Site Citation Kathleen M. McManus, Jeffrey S. Hanor; Diagenetic evidence for massive evaporite dissolution, fluid flow, and mass transfer in the Louisiana Gulf Coast. Geology 1993;; 21 (8): 727–730. doi: https://doi.org/10.1130/0091-7613(1993)021<0727:DEFMED>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 A study of sediment alteration on the west flank of the West Hackberry dome, Louisiana Gulf Coast, has documented the existence of ∼5 x 1010 kg of authigenic calcite-pyrite cement in Miocene sands at depths of 1.4 to 2.1 km in a 1.5 by 1.5 km area adjacent to the dome. The Sr, C, and S isotopic compositions of the cements support the hypothesis that Ca and S were derived from dissolution of salt-dome anhydrite and that carbonate was derived by thermochemical oxidation of methane and by sulfate reduction, possibly at temperatures as low as 70 °C. Constraints on the maximum aqueous concentrations of Ca that could be produced by dissolving diapiric salt require that >5 x 109 m3 of aqueous fluid, equivalent to a fluid volume/ pore volume ratio of >250:1, were involved in destroying salt, transporting Ca and SO4, and precipitating these cements. The presence of such cements requires a dynamic subsurface mass-transport regime involving either large volumes of fluid or fluids that are extensively recirculated. This content is PDF only. Please click on the PDF icon to access. 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.