This article describes the textures, age and geochemistry of layered carbonate crusts formed by processes of regelation and melting at the rock-ice interphase of the Triglav glacier. This type of continental carbonate act as a unique archive of basal conditions and its preservation in the Triglav area possibly indicates the existence of the glacier during most part of the Holocene. Carbon and oxygen isotope compositions suggest a low contribution of biological processes in carbonate precipitation. The contribution of the project leader Andrea Martín Pérez to the article, which was not anticipated in the project application, is a petrographic analysis of this special type of terrestrial carbonates.
COBISS.SI-ID: 14473475
Formation of fibrous microcrystalline gypsum and macroscopic gypsum speleothems in lava tubes of Lanzarote was studied to unravel the precipitation mechanisms of these two fabric types of gypsum. Analysis of 87Sr/86Sr ratios supplied information about the seawater source of Ca. ?34S and the ?18O of gypsum were analysed to investigate the origin of sulphur and the possible microbial influence in gypsum formation. The article is related to the present project in the part dealing with isotopic fractionation and the potential influence of microbial processes on the formation of speleothems, morphologically very similar to cave moon milk.
COBISS.SI-ID: 44470061