The Cold Carbonate Connection Between Mono Lake, Californiaand the Bransfield Strait, Antarctica
  • 【DOI】

    10.1023/A:1009696617671

  • 【摘要】

    Ikaite is a rare form of carbonate – calciumcarbonate hexahydrate (CaCO3·6H2O) and isthe precursor to thinolites. Metastable ''ikaite''crystals, discovered in unconsolidated marinesediments in the Kin... 展开>>Ikaite is a rare form of carbonate – calciumcarbonate hexahydrate (CaCO3·6H2O) and isthe precursor to thinolites. Metastable ''ikaite''crystals, discovered in unconsolidated marinesediments in the King George Basin in the BransfieldStrait, Antarctica, are related to diageneticremineralization reactions of organic matter. StableC, O, and H-isotopes track the response of ikaitecrystals, during growth, to changing interstitialfluid conditions as a result of bacterial sulphatereduction and methanogenesis. Ikaites form inpreference over calcite or aragonite at the prevailingsurface sediment conditions of -6 °C and 200bar in the King George Basin.The calcareous tufa towers of the terrestrial,hypersaline Mono Lake of northern California areCaCO3-precipitates formed by the influx ofsubmerged springs of calcium-rich freshwaters enteringthe alkaline lake (SgrCO2 = 0.5 m, pH =9.8). Under current climatic cond 收起<<

  • 【作者】

  • 【刊期】

    Aquatic Geochemistry 1998年3-4期

  • 【语种】

    eng