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Inclusions in calcite phantom crystals suggest role of clay minerals in dolomite formation

Stefan Farsang, Peter Pekker, Giulio I. Lampronti, Zsombor Molnar, Rastislav Milovsky, Mihaly Posfai, Daniel Ozdin, Timothy D. Raub and Simon A. T. Redfern
Inclusions in calcite phantom crystals suggest role of clay minerals in dolomite formation
American Mineralogist (July 2022) 107 (7): 1369-1377


Micro- and nano-inclusions embedded in calcite phantom crystals from Gemerska Ves, Slovak Republic, have been characterized by a combination of Raman spectroscopy, scanning and transmission electron microscopy, X-ray powder diffraction, and C and O isotope analysis. Whereas the outer, colorless part of the phantom crystal is relatively homogeneous and cavity and inclusion-free, the inner terracotta-colored part contains abundant cavities, dolomite, hematite, goethite, titanite, phyllosilicates (mainly kaolinite and illite), and apatite inclusions and nanostructures that have formed on the walls of cavities. The nanostructures comprise hematite and goethite particles sandwiched between either two phyllosilicate crystals or a phyllosilicate and a carbonate (calcite or dolomite) crystal. Our observations suggest that all inclusions in the terracotta calcite originate from the terra rossa (a common soil type in karstic areas) and limestone outcropping adjacent to the calcite crystals. While the micrometer-sized phyllosilicate and hematite particles were likely transported from the terra rossa and attached to the surface of growing calcite, the presence of phyllosilicates that are only a few atomic layers thick and of euhedral hematite, goethite, and dolomite crystals suggests that these particles precipitated along with the phantom calcite in situ, from an aqueous solution carrying terra rossa-derived and limestone-derived solutes. The compositional differences between the terra rossa (e.g., smectite as the only major Mg-rich phase) and terracotta calcite inclusions (e.g., dolomite as the only major Mg-rich phase and the presence of only Mg-free clays) hint that a smectite-illite conversion provides the Mg necessary for the precipitation of dolomite and possibly the Fe associated with the iron oxyhydroxide nanostructures. Phyllosilicate nucleation on calcite and dolomite nucleation on phyllosilicates, as inferred from nanoscale mineralogical associations, suggest that carbonates and phyllosilicates may mutually enhance nucleation and growth. This enhancement may result in the formation of large-scale clay-carbonate successions in aqueous settings, including the enigmatic, pink-colored cap dolostones succeeding late Neoproterozoic "Snowball Earth" deposits. The distribution of inclusions in the terracotta calcite and the preferred nucleation of hematite and goethite on phyllosilicate, rather than on carbonate surfaces, indicates that phyllosilicates have a potential to not only disrupt crystal growth and trigger the formation of cavities in the structure of the calcite host, but also to provide surfaces for the precipitation of different phases in the cavities and to uniformly distribute otherwise incompatible materials in a calcite host crystal. This calls for further exploration of the potential application of phyllosilicates in composite structure development.

ISSN: 0003-004X
EISSN: 1945-3027
Serial Title: American Mineralogist
Serial Volume: 107
Serial Issue: 7
Title: Inclusions in calcite phantom crystals suggest role of clay minerals in dolomite formation
Affiliation: University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom
Pages: 1369-1377
Published: 202207
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 52
Accession Number: 2022-055904
Categories: Mineralogy of non-silicatesIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N48°27'00" - N48°27'00", E20°19'00" - E20°19'00"
Secondary Affiliation: University of Pannonia, HUN, HungarySlovak Academy of Sciences, SVK, SlovakiaComenius University, SVK, SlovakiaNanyang Technological University, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2022
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