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Sediment–sea-water interaction at 200 and 300 °C, 500 bars pressure: The role of sediment composition in diagenesis and low-grade metamorphism of marine clay
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1985
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Sedimentary RecordGsa Bulletin 1985EngineeringSedimentary GeologyBars PressureEarth ScienceOrganic CarbonSediment AnalysisMarine ClayMarine GeologySediment-water InteractionGeologySedimentary PetrologySediment–sea-water InteractionSedimentologySediment TransportCoastal Sediment TransportEarly DiagenesisMarine MaterialsSediment ProcessGeochemistryPetrologySedimentation
Research Article| October 01, 1985 Sediment–sea-water interaction at 200 and 300 °C, 500 bars pressure: The role of sediment composition in diagenesis and low-grade metamorphism of marine clay EDWARD C. THORNTON; EDWARD C. THORNTON 1Department of Geology and Geophysics, University of Minnesota, Minneapolis, Minnesota 55455 Search for other works by this author on: GSW Google Scholar WILLIAM E. SEYFRIED, JR. WILLIAM E. SEYFRIED, JR. 1Department of Geology and Geophysics, University of Minnesota, Minneapolis, Minnesota 55455 Search for other works by this author on: GSW Google Scholar GSA Bulletin (1985) 96 (10): 1287–1295. https://doi.org/10.1130/0016-7606(1985)96<1287:SIAACB>2.0.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation EDWARD C. THORNTON, WILLIAM E. SEYFRIED; Sediment–sea-water interaction at 200 and 300 °C, 500 bars pressure: The role of sediment composition in diagenesis and low-grade metamorphism of marine clay. GSA Bulletin 1985;; 96 (10): 1287–1295. doi: https://doi.org/10.1130/0016-7606(1985)96<1287:SIAACB>2.0.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 SocietyGSA Bulletin Search Advanced Search Abstract Experimental interaction of clay-rich marine sediments with sea water at 200 and 300 °C, 500 bars, and a water/rock mass ratio of 5 resulted in the generation of relatively acid, oxidizing conditions. The development of acidity is attributed to the formation of smectite, whereas the oxidation state of the fluids was dependent on the relative proportions of ferromanganese oxide phase, ferrous-rich silicate phases, and organic carbon. An experiment conducted with an oxidized sediment at 300 °C thus produced higher aqueous concentrations of Mn and associated base metals at a relatively high fO2 (∼10−15), but an organic carbon-rich sediment yielded fluids characterized by a lower fO2 (∼10−20), lower concentrations of Mn, higher Fe, and exhibited substantial thermal alteration and dissolution of organic components. Silica concentrations in the experimental fluids ranged from cristobalite to amorphous silica saturation levels in response to the dissolution of amorphous silica.Comparison of fluid data and mineralogical assemblages from the Gulf Coast and Salton Sea regions with experimental results suggests that alteration processes in sedimentary basins can, in large part, be attributed to water-rock interaction. Observed differences are apparently due to the higher degree of reaction in the geologic environment and to the increased stability of the illite-chlorite assemblage at the lower silica activity characteristic of geologic fluids. 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.