Biogeochemical reappraisal of the freshwater–seawater mixing‐zone diagenetic model

  title={Biogeochemical reappraisal of the freshwater–seawater mixing‐zone diagenetic model},
  author={Daniel A. Petrash and Or M. Bialik and Philip T. Staudigel and Kurt O. Konhauser and David A. Budd},
First proposed nearly half a century ago, the mixing‐zone model of dolomitization enjoyed a brief stay in the limelight before falling out of favour. Despite extended past criticism, arguments that build on its current validity are presented and discussed. The coastal mixing zone can be seen as an aquifer system exhibiting marked physicochemical gradients, reflective of the admixture of low salinity freshwater and seawater sources with variable redox potentials. This perspective requires a more… 
Systematic laboratory approach to produce Mg-rich carbonates at low temperature
Dolomite is a common Mg-rich carbonate in the geological record, but the mechanism of its formation remains unclear. At low temperature, the incorporation of magnesium ions into the carbonate
Supplementary material to "Aqueous system-level processes and prokaryote assemblages in the ferruginous and sulfate-rich bottom waters of a post-mining lake"
Abstract. In the aqueous oligotrophic ecosystem of a post-mining lake (Lake Medard, Czechia), reductive Fe(II) dissolution outpaces sulfide generation from microbial sulfate reduction (MSR), and
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1 S. T. Murray, J. A. Higgins, C. Holmden, C. Lu and P. K. Swart Geochemical fi ngerprints of dolomitization in Bahamian carbonates: Evidence from sulphur, calcium, magnesium and clumped isotopes 30
Highest resolution chemical imaging based on secondary ion mass spectrometry performed on the helium ion microscope
This paper is a review on the combination between Helium Ion Microscopy (HIM) and Secondary Ion Mass Spectrometry (SIMS), which is a recently developed technique that is of particular relevance in


Nitrogen biogeochemistry of submarine groundwater discharge
To investigate the role of the seepage zone in transport, chemical speciation, and attenuation of nitrogen loads carried by submarine groundwater discharge, we collected nearshore groundwater samples
Stable isotope systematics of two cenotes from the northern Yucatan Peninsula, Mexico
Deep water‐filled sinkholes, cenotes, are common in the northern Yucatan Peninsula. At least five of these cenotes are deep enough to extend through a freshwater lens of meteoric origin in which δ18O
Nutrient biogeochemistry in a Gulf of Mexico subterranean estuary and groundwater‐derived fluxes to the coastal ocean
We hypothesize that biogeochemical processes in a subterranean estuary in the northeastern Gulf of Mexico significantly alter nutrient concentrations that are discharged into the ocean via submarine
Water-rock interactions in a modern coastal mixing zone
The chemical evolution of ground water and the diagenetic history of the rocks in a modern saline–fresh-water mixing zone were investigated to test the hypothesis that this zone is a chemically
Dynamic hydrologic and biogeochemical processes drive microbially enhanced iron and sulfur cycling within the intertidal mixing zone of a beach aquifer
Intertidal aquifers host a reactive zone comprised of Fe mineral‐coated sands where fresh and saline groundwaters mix. This zone may significantly influence the export of C, N, P, Fe, and other
Mixing-Zone Diagenesis in the Subsurface of Florida and the Bahamas
Abstract Three cores from Great Bahama Bank and southern Florida contain examples of mixing-zone diagenesis where typical shallow-water, aragonite-rich sediments were altered to low-Mg calcite. The
Microbially catalyzed dolomite formation: From near-surface to burial
Microbial Function and Hydrochemistry within a Stratified Anchialine Sinkhole: A Window into Coastal Aquifer Interactions
Anchialine sinkholes provide insight into coastal aquifer systems and coastal mixing processes. Aquifer microbial community function is usually inferred from hydrochemical information, but there are