Loss of calcareous microfossils from sediments through gypsum formation
作者： D Schnitker , L.M Mayer , S Norton
DOI: 10.1016/0025-3227(80)90085-7
关键词: Dissolution 、 Elphidium 、 Environmental chemistry 、 Authigenic 、 Mineralogy 、 Geology 、 Gypsum 、 Iron sulfide 、 Oxygen 、 Calcareous 、 Partial loss 、 Geochemistry and Petrology 、 Oceanography
摘要: Abstract Laboratory experiments with fresh marine sediments demonstrate the dissolution of calcareous microfossils (foraminifers) and production “authigenic” gypsum. Slow oxidation iron sulfide in presence oxygen drives following reactions: 1. (1) 4FeS + 9O2 6H2O = 4FeO(OH) 4SO2−4 8H+ or 2 FeS 7 1 O 5 H FeO ( OH ) 4 SO 2− 8 2. (2) H+ CaCO3 Ca2+ HCO−3 3. (3) SO2−4 2H2O CaSO4·2H2O Three-month resulted minor to total different species from estuarine open ocean sediments. Elphidium ustilatum was most resistant whereas subarcticum first disappear completely. Agglutinated foraminifers are nearly completely destroyed largely because bacterial decay test binding agent. Loss partial loss may occur either conditions storage after collection changing environmental (primarily levels) at sediment—water interface.
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