Petrographic and geochemical evidence for the formation of primary, bacterially induced lacustrine dolomite: La Roda ‘white earth’ (Pliocene, central Spain)
Open accessAbstract
Upper Pliocene dolomites (‘white earth’) from La Roda, Spain, offer a good opportunity to evaluate the process of dolomite formation in lakes. The relatively young nature of the deposits could allow a link between dolomites precipitated in modern lake systems and those present in older lacustrine formations. The La Roda Mg‐carbonates (dolomite unit) occur as a 3·5‐ to 4‐m‐thick package of poorly indurated, white, massive dolomite beds with interbedded thin deposits of porous carbonate displaying root and desiccation traces as well as local lenticular gypsum moulds. The massive dolomite beds consist mainly of loosely packed 1‐ to 2‐μm‐sized aggregates of dolomite crystals exhibiting poorly developed faces, which usually results in a subrounded morphology of the crystals. Minute rhombs of dolomite are sparse within the aggregates. Both knobbly textures and clumps of spherical bodies covering the crystal surfaces indicate that bacteria were involved in the formation of the dolomites. In addition, aggregates of euhedral dolomite crystals are usually present in some more clayey (sepiolite) interbeds. The thin porous carbonate (mostly dolomite) beds exhibit both euhedral and subrounded, bacterially induced dolomite crystals. The carbonate is mainly Ca‐dolomite (51–54 mol% CaCO 3), showing a low degree of ordering (degree of ordering ranges from 0·27 to 0·48). Calcite is present as a subordinate mineral in some samples. Sr, Mn and Fe contents show very low correlation coefficients with Mg/Ca ratios, whereas SiO 2 and K contents are highly correlated. δ 18 O‐ and δ 13 C‐values in dolomites range from −3·07‰ to 5·40‰ PDB (mean=0·06, σ=1·75) and from −6·34‰ to −0·39‰ PDB (mean=−3·55, σ=1·33) respectively. Samples containing significant amounts of both dolomite and calcite do not in general show significant enrichment or depletion in 18 O and 13 C between the two minerals. The correlation coefficient between δ 18 O and δ 13 C for dolomite is extremely low and negative (r=−0·05), whereas it is higher and positive (r=0·47) for calcite. The lacustrine dolomite deposit from La Roda is interpreted mainly as a result of primary precipitation of dolomite in a shallow, hydrologically closed perennial lake. The lake was supplied by highly saturated HCO 3−/CO 32− groundwater that leached dolomitic Mesozoic formations. Precipitation of dolomite from alkaline lake waters took place under a semi‐arid to arid climate. However, according to our isotopic data, strong evaporative conditions were not required for the formation of the La Roda dolomite. A significant contribution by bacteria to the formation of the dolomites is assumed in view of both petrographic and geochemical evidence.
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“Additionally, IAEA-C1, IAEA-C2, Merck, and Rodolo (La Roda dolomite; see García del Cura et al., 2001 and Müller et al., 2017) were each measured once per run; NIST SRM-88b (a dolomite standard) was analyzed twice per run as a dolomite-specific check of the accuracy of the data set and for…”
Method
- Authors
- García Del Cura, M. A., Calvo, J. P., Ordóñez, S., Jones, B. F., & Cañaveras, J. C.
- Affiliations
- Universidad Complutense de Madrid (ES)
- Corresponding author
- Calvo, Jose P.
- Jones, Blair F.
- Cañaveras, Juan C.
- Venue
- Sedimentology
- Publisher
- Wiley
- Published
- 2001-08-16
- Volume
- 48
- Issue
- 4
- Pages
- 897-915
- ISSN
- 0037-0746 (ISSN-L)
- 1365-3091
- OpenAlex
- W2096025514
- Cited by
- 81
- References
- 67
- Citations by year
- 2025: 4 · 2024: 3 · 2023: 7 · 2022: 5 · 2021: 1 · 2020: 4 · 2019: 4 · 2018: 3 · 2017: 2 · 2016: 5 · 2015: 4 · 2014: 8 · 2013: 7 · 2012: 1
- FWCI
- 1.36
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Sedimentology (publishedVersion)
- Docta Complutense (Universidad Complutense de Madrid) (submittedVersion, cc-by-nc-nd)
- Funders
- Universidad de Alicante
- U.S. Geological Survey
- Topics
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
- Physical Sciences › Earth and Planetary Sciences › Earth-Surface Processes › Geological formations and processes
- Keywords
- dolomite formation, Pliocene, lake sediments, dolomite aggregate, degree of ordering, stable isotopes, carbon and oxygen isotopes, Mg/Ca ratio, sepiolite, carbonate geochemistry, microbial carbonate precipitation, calcite
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