Evaluation of the Potential for Dissolved Oxygen Ingress into Deep Sedimentary Basins during a Glaciation Event
Joint Authors
Bea, Sergio A.
Su, Danyang
Mayer, K. Ulrich
MacQuarrie, Kerry T. B.
Source
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-20, 20 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-04-24
Country of Publication
Egypt
No. of Pages
20
Main Subjects
Abstract EN
Geochemical conditions in intracratonic sedimentary basins are currently reducing, even at relatively shallow depths.
However, during glaciation-deglaciation events, glacial meltwater production may result in enhanced recharge (Bea et al., 2011; and Bea et al., 2016) potentially having high concentrations of dissolved oxygen (O2).
In this study, the reactive transport code Par-MIN3P-THCm was used to perform an informed, illustrative set of simulations assessing the depth of penetration of low salinity, O2-rich, subglacial recharge.
Simulation results indicate that the large-scale basin hydrostratigraphy, in combination with the presence of dense brines at depth, results in low groundwater velocities during glacial meltwater infiltration, restricting the vertical ingress of dilute recharge waters.
Furthermore, several geochemical attenuation mechanisms exist for O2, which is consumed by reactions with reduced mineral phases and solid organic matter (SOM).
The modeling showed that effective oxidative mineral dissolution rates and SOM oxidation rates between 5 × 10−15 and 6 × 10−13 mol dm−3 bulk s−1 were sufficient to restrict the depth of O2 ingress to less than 200 m.
These effective rates are low and thus conservative, in comparison to rates reported in the literature.
Additional simulations with more realistic, yet still conservative, parameters reaffirm the limited ability for O2 to penetrate into sedimentary basin rocks during a glaciation-deglaciation event.
American Psychological Association (APA)
Bea, Sergio A.& Su, Danyang& Mayer, K. Ulrich& MacQuarrie, Kerry T. B.. 2018. Evaluation of the Potential for Dissolved Oxygen Ingress into Deep Sedimentary Basins during a Glaciation Event. Geofluids،Vol. 2018, no. 2018, pp.1-20.
https://search.emarefa.net/detail/BIM-1158946
Modern Language Association (MLA)
Bea, Sergio A.…[et al.]. Evaluation of the Potential for Dissolved Oxygen Ingress into Deep Sedimentary Basins during a Glaciation Event. Geofluids No. 2018 (2018), pp.1-20.
https://search.emarefa.net/detail/BIM-1158946
American Medical Association (AMA)
Bea, Sergio A.& Su, Danyang& Mayer, K. Ulrich& MacQuarrie, Kerry T. B.. Evaluation of the Potential for Dissolved Oxygen Ingress into Deep Sedimentary Basins during a Glaciation Event. Geofluids. 2018. Vol. 2018, no. 2018, pp.1-20.
https://search.emarefa.net/detail/BIM-1158946
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1158946