Cited by 81Calcium Carbonate Crystallization and InhibitionGeochemistry and Elemental AnalysisCO2 Sequestration and Geologic Interactions

Calcium and magnesium-limited dolomite precipitation at Deep Springs Lake, California

MEISTER, PATRICK, REYES, CAROLINA, BEAUMONT, WILL, RINCON, MIGUEL, COLLINS, LISA, BERELSON, WILLIAM, STOTT, LOWELL, CORSETTI, FRANK +1 more·2011·Sedimentology

Abstract

Dolomite [Ca,Mg(CO 3)2] precipitation from supersaturated ionic solutions at Earth surface temperatures is considered kinetically inhibited because of the difficulties experienced in experimentally reproducing such a process. Nevertheless, recent dolomite is observed to form in hypersaline and alkaline environments. Such recent dolomite precipitation is commonly attributed to microbial mediation because dolomite has been demonstrated to form in vitro in microbial cultures. The mechanism of microbially mediated dolomite precipitation is, however, poorly understood and it remains unclear what role microbial mediation plays in natural environments. In the study presented here, simple geochemical methods were used to assess the limitations and controls of dolomite formation in Deep Springs Lake, a highly alkaline playa lake in eastern California showing ongoing dolomite authigenesis. The sediments of Deep Springs Lake consist of unlithified, clay‐fraction dolomite ooze. Based on δ 18 O equilibria and textural observations, dolomite precipitates from oxygenated and agitated surface brine. The Na‐SO 4‐dominated brine contains up to 500 m m dissolved inorganic carbon whereas Mg 2+ and Ca 2+ concentrations are ca 1 and 0·3 m m, respectively. Precipitation in the subsurface probably is not significant because of the lack of Ca 2+ (below 0·01 m m). Under such highly alkaline conditions, the effect of microbial metabolism on supersaturation by pH and alkalinity increase is negligible. A putative microbial effect could, however, support dolomite nucleation or support crystal growth by overcoming a kinetic barrier. An essential limitation on crystal growth rates imposed by the low Ca 2+ and Mg 2+ concentrations could favour the thermodynamically more stable carbonate phase (which is dolomite) to precipitate. This mode of unlithified dolomite ooze formation showing δ 13 C values near to equilibrium with atmospheric CO 2 (ca 3‰) contrasts the formation of isotopically light (organically derived), hard‐lithified dolomite layers in the subsurface of some less alkaline environments. Inferred physicochemical controls on dolomite formation under highly alkaline conditions observed in Deep Springs Lake may shed light on conditions that favoured extensive dolomite formation in alkaline Precambrian oceans, as opposed to modern oceans where dolomites only form diagenetically in organic C‐rich sediments.

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Crossref · 10.1111/j.1365-3091.2011.01240.x

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Authors
MEISTER, P., REYES, C., BEAUMONT, W., RINCON, M., COLLINS, L., BERELSON, W., STOTT, L., CORSETTI, F., & NEALSON, K. H.
Affiliations
  • University of Southern California (US)
  • University of California, Santa Cruz (US)
Corresponding author
MEISTER, PATRICK
Venue
Sedimentology
Publisher
Wiley
Published
2011-05-11
Volume
58
Issue
7
Pages
1810-1830
ISSN
  • 0037-0746 (ISSN-L)
  • 1365-3091
OpenAlex
W1491851109
Cited by
81
References
78
Citations by year
2026: 2 · 2025: 3 · 2024: 7 · 2023: 12 · 2022: 8 · 2021: 11 · 2020: 7 · 2019: 8 · 2018: 3 · 2017: 2 · 2016: 2 · 2015: 6 · 2014: 4 · 2013: 1 · 2012: 5
FWCI
1.31
Type
journal article
Language
en
Open access
closed
Locations
  • Sedimentology (publishedVersion)
  • Max Planck Digital Library (submittedVersion)
  • MPG.PuRe (Max Planck Society) (submittedVersion)
Topics
  • Physical Sciences › Materials Science › Biomaterials › Calcium Carbonate Crystallization and Inhibition
  • Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
  • Physical Sciences › Environmental Science › Environmental Engineering › CO2 Sequestration and Geologic Interactions
Keywords
dolomite precipitation, calcium limitation, magnesium limitation, authigenic dolomite, microbial mediation, supersaturation, brine chemistry, oxygen isotopes, carbon isotopes, Precambrian oceans

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