Articles | Volume 33, issue 3
https://doi.org/10.5194/ejm-33-329-2021
https://doi.org/10.5194/ejm-33-329-2021
Research article
 | 
29 Jun 2021
Research article |  | 29 Jun 2021

Sequential dehydration of the phosphate–sulfate association from Gura Dobrogei Cave, Dobrogea, Romania

Delia-Georgeta Dumitraş and Ştefan Marincea

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Latest update: 04 Nov 2024
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Short summary
The low-temperature transformations of phosphate and sulfate sequences in the fossil guano from a Romanian cave were investigated using a mineralogical and chemical approach, resulting in the finding of a quite exotic mineral association, including the rare minerals francoanellite and monetite. The dehydration process of primary guano minerals seems driven by exothermic reactions at local scale (e.g., oxidation of ammonia, organic matter, allogenic pyrite or other organic compounds).