Presencia de yeso en Lobos, Buenos Aires. Argentina
1992; Volume: 11; Issue: 100 Linguagem: Inglês
ISSN
0325-2264
AutoresNauris Vitauts Dangavs, Adriana Mónica Blasi,
Tópico(s)Groundwater and Isotope Geochemistry
ResumoA large concentration of sand size.lens-shaped gypsum crystals has been recognized in theelastic sediments filling up Lobos Lake. The crystals. as a whole. constitute an earlhy-sandy deposit of impure gypsite. The gypsum is intersperscd, in friable mudstones. principally lhose assigned to a mixoh::line palaeoenvironment. The e1astic-chemical malerial has a volume of 8,73 hm3 and a gypsum conlenl of over 8 millon tons. Various gypsum occurences in lhe Salado River basin have lhe same characteristics. They are related lo the rise of sulfate rich groundwaters, which acted as a saline solution in lhe capillary-fTinge evaporation level of the lacustrine palaeoenvironment. Gypsum precipitation is related to arid palaeoclimatic phases during the Holocene.
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