Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5781330 | Sedimentary Geology | 2017 | 17 Pages |
Abstract
Aragonite-bearing samples show higher concentrations in Sr, Ba and U while calcitic solids are enriched in Mg. These differences could be attributed to mineralogy, temperature or different precipitation rates. The geochemical evaluation of the chemistry of both the solids and their parental waters suggests that differences in the rate of CO2-degassing and, in some cases, evaporation are the primary environmental controls on isotopic compositions. In addition, the results show that, if strong evaporation and CO2-degassing are involved, calcite precipitation occurs under conditions of isotopic disequilibrium with its parental water. The results of our study are useful to interpret old depositional environments and palaeotemperatures.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Earth-Surface Processes
Authors
Maria P. Asta, Luis F. Auqué, Francisco J. Sanz, Maria J. Gimeno, Patricia Acero, Mónica Blasco, Antonio GarcÃa-Alix, Javier Gómez, Antonio Delgado-Huertas, Juan Mandado,