BIP! Finder - Growing spherulitic calcite grains in saline, hyperalkaline lakes: experimental evaluation of the effects of Mg-clays and organic acids

2016 • Growing spherulitic calcite grains in saline, hyperalkaline lakes: experimental evaluation of the effects of Mg-clays and organic acids

Authors: Mercedes-Martín, R., Rogerson, M.R., Brasier, A.T., Vonhof, H.B., Prior, T., Fellows, S.M., Reijmer, J.J.G., Billing, I., Pedley, H.M.

Venue: Sedimentary Geology

Type: Publication

Abstract: The origin of spherical-radial calcite bodies - spherulites - in sublacustrine, hyperalkaline and saline systems is unclear, and therefore their palaeoenvironmental significance as allochems is disputed. Here, we experimentally investigate two hypotheses concerning the origin of spherulites. The first is that spherulites precipitate from solutions super-saturated with respect to magnesium-silicate clays, such as stevensite. The second is that spherulite precipitation happens in the presence of dissolved, organic acid molecules. In both cases, e... (read more)

Topics: Mineralogy

DOI: 10.1016/j.sedgeo.2016.02.008

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