Cited by 6Geochemistry and Elemental AnalysisCalcium Carbonate Crystallization and InhibitionKarst Systems and Hydrogeology

Equilibrium between dolomitization and dedolomitization of a global set of surface water samples: A new theoretical insight on the dolomite inorganic formation mechanism

Wang, Xinyu·2021·Marine Chemistry

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Crossref · 10.1016/j.marchem.2021.104017

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  • According to the latest thermodynamic study, modern seawater is not conducive to dolomitization, and seawater is favorable for dolomitization in only a few regions, such as Abu Dhabi, the Mediterranean and the hypersaline lagoons in Brazil.

    “Modern seawater is located in the dedolomitization zone, and the seawater of Abu Dhabi, the Mediterranean, and the Persian Gulf is located in the dolomitization zone.”
  • The new CDGPE phase equilibrium model indicates that the increase in activity ratios of Mg2+ to Ca2+ and SO4 to HCO3, as well as more acidic condition, will promote dolomite precipitate.

    “This model indicates that the increase in activity ratios of Mg 2+ to Ca 2+ and SO 2- 4 to HCO - 3 , as well as the more acidic condition, will promote dolomite precipitate [24].”
  • The new CDGPE model has proved reliable and useful in predicting surface water reported in dolomitization and dedolomitization, including modern seawater; modern seawater is located in the dedolomitization zone, and seawater of Abu Dhabi, the Mediterranean, and the Persian Gulf is located in the dolomitization zone.

    “this model has proved reliable and useful in predicting the surface water reported in dolomitization and dedolomitization (including in modern seawater) (Figure 4); Modern seawater is located in the dedolomitization zone, and the seawater of Abu Dhabi, the Mediterranean, and the Persian Gulf is located in the dolomitization zone.”
  • SO4 may promote or catalyze dolomite precipitation.

    “It has also been noted that SO 2- 4 may even be a catalyst for dolomite precipitation [102,103]”
  • Removal of sulfate by microbial sulfate reduction at surface temperatures is not the key factor inhibiting low-temperature dolomite formation; rather, sulfate may promote dolomite formation.

    “the removal of sulfate by microbial sulfate reduction at surface temperatures is not the key factor in inhibiting the formation of low-temperature dolomite; rather, sulfate may promote the formation of dolomite [24,102,103].”

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Authors
Wang, X.
Affiliations
Chengdu University of Technology (CN)
Corresponding author
Wang, Xinyu
Venue
Marine Chemistry
Publisher
Elsevier BV
Published
2021-09
Volume
235
Pages
104017
ISSN
0304-4203 (ISSN-L)
OpenAlex
W3192849879
Cited by
6
References
4
Citations by year
2026: 1 · 2025: 2 · 2023: 3
FWCI
0.45
Type
journal article
Language
en
Open access
closed
Locations
Marine Chemistry (publishedVersion)
Funders
National Natural Science Foundation of China (41807357)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
  • Physical Sciences › Materials Science › Biomaterials › Calcium Carbonate Crystallization and Inhibition
  • Physical Sciences › Earth and Planetary Sciences › Earth-Surface Processes › Karst Systems and Hydrogeology
Keywords
dolomitization, dedolomitization, saturation index, gypsum, dolomite problem, Permian-Triassic transition

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