38 Trace Metals in the Environment (Posters)
Tuesday, 22 March 2016
8:00 AM - 12:00 PM
Convention Hall
ROLE OF EUXINIC CONDITIONS IN ADSORBING ARSENIC IN ORGANIC MATTER AND PYRITE PRESERVED IN THE LOCKATONG FORMATION OF NEWARK: IMPLICATION TO THE QUALITY OF GROUNDWATER
Paper number: 38-5
Program: Theme Sessions
Time: 8:00 AM – 12:00 PM
Authors
Abstract
The Lockatong formation of Newark basin is rich in organic matter. It hosts pyrite which occurs as dissemination, small patches, or parallel veins. The isotope sulfur isotope values of pyrite samples range from -7.5 to 0.5 ‰CDT (average = -3.5‰CDT). The negative δ34S values are indicative of Bacterial Sulfate Reduction (BSR) under low temperature and euxinic conditions. It is under these conditions that Arsenic was incorporated into both organic matter and pyrites (pending Total Organic Carbon and Arsenic data). These euxinic conditions enhanced the preservation of organic matter, the formation of pyrite, and also the complexation/adsorption of Aresnic.The organic matter-rich anoxic levels of this formation and pyrites are potential sources of Arsenic in groundwater in Newark basin, with Arsenic values reaching up to 215 μg/L.
Geological Society of America Abstracts with Programs. Vol. 48, No. 1
doi: 10.1130/abs/2016NE-272262
© Copyright 2016 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.