Mineralogy and Chemistry of the Patapsco Formation, Maryland, Related to the Ground-Water Geochemistry and Flow System: A Contribution to the Origin of Red Beds

Abstract

Research Article| February 01, 1975 Mineralogy and Chemistry of the Patapsco Formation, Maryland, Related to the Ground-Water Geochemistry and Flow System: A Contribution to the Origin of Red Beds PAUL R. SCHLUGER; PAUL R. SCHLUGER 1Amerada Minerals Corporation of Canada, Ltd., 540 5th Ave. S.W., Calgary, Alberta, T2P OM3, Canada Search for other works by this author on: GSW Google Scholar HERMAN E. ROBERSON HERMAN E. ROBERSON 2Department of Geological Sciences, State University of New York at Binghamton, Binghamton, New York 13901 Search for other works by this author on: GSW Google Scholar Author and Article Information PAUL R. SCHLUGER 1Amerada Minerals Corporation of Canada, Ltd., 540 5th Ave. S.W., Calgary, Alberta, T2P OM3, Canada HERMAN E. ROBERSON 2Department of Geological Sciences, State University of New York at Binghamton, Binghamton, New York 13901 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1975) 86 (2): 153–158. https://doi.org/10.1130/0016-7606(1975)86<153:MACOTP>2.0.CO;2 Article history First Online: 01 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 PAUL R. SCHLUGER, HERMAN E. ROBERSON; Mineralogy and Chemistry of the Patapsco Formation, Maryland, Related to the Ground-Water Geochemistry and Flow System: A Contribution to the Origin of Red Beds. GSA Bulletin 1975;; 86 (2): 153–158. doi: https://doi.org/10.1130/0016-7606(1975)86<153:MACOTP>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 Red and drab-colored sediments of the Patapsco Formation were studied to determine if color changes, clay mineralogy, and iron content of the sediments are related to the present ground-water geochemistry (Back and Barnes, 1965) and the present ground-water flow system (Mack, 1962). The red color of the sediments becomes darker in the direction of the ground-water flow, particularly in local discharge areas. This color change is related to the amount and kind of iron oxides in the sediments. Hematite and goethite coexist in most of the red and mottled samples; hematite is more abundant than goethite in red sediments but is rarely found in drab sediments. Large amounts of amorphous or poorly ordered iron oxyhydroxides in these sediments indicate that much of the iron has been introduced by diagenetic processes. Lower iron oxide values prevail toward the center of the outcrop belt, and higher values prevail in the recharge area. Detrital kaolinite and illite are the most abundant clay minerals. Vermiculite and mixed-layer illite-smectite are almost always found in red colored sediments and are probably products of post-depositional diagenesis.The mineralogic and chemical variations correlate regionally with the observed ground-water flow pattern and with observed changes in Eh and dissolved iron content of the ground water. These results suggest that fluctuations in the ground-water flow system in conjunction with Eh and pH conditions caused precipitation of iron hydroxides that, on aging, have crystallized as goethite and (or) hematite. 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.