Matches in SemOpenAlex for { <https://semopenalex.org/work/W4313406430> ?p ?o ?g. }
- W4313406430 endingPage "1627" @default.
- W4313406430 startingPage "1627" @default.
- W4313406430 abstract "Calcium carbonate hexahydrate (ikaite) is a rare mineral that forms as metastable species in the organic-carbon-rich sediments of the King George Basin, Bransfield Strait, Antarctica, as a consequence of early diagenetic decomposition of organic matter under cold water (−1.4 °C) and high pressure (200 bar) conditions. Large crystals grow in the sediment immediately below the diagenetic transition between microbial sulfate reduction and methanogenesis at ~320 cm below sea floor (bsf). This process is reflected in the dissolved sulfate, total carbon dioxide, and methane concentrations, as well as in the carbon, hydrogen, and oxygen isotope chemistries of the interstitial fluids and dissolved gases of the host sediment. The ikaite crystal faithfully records in its zonal structure the changing carbon isotope ratio of the total dissolved carbon dioxide pool as it gradually diminishes during methanogenesis (δ13Cikaite = −17.5 to −21.4‰). These changes in the crystal’s host environment follow general Rayleigh carbon isotope fractionation. The oxygen isotopes of the ikaite carbonate (δ18Oikaite = 1.46 to 4.45‰) also show a strong zonal distribution, unrelated to temperature of formation, but perhaps controlled by the degree of recrystallization of ikaite to calcite. The crystal water of the ikaite is depleted 11‰ in 2H/1H (VSMOW) relative to the coexisting interstitial water, which is in excellent agreement with the isotope fractionation of other hydrated minerals. In addition to the in situ temperature and pressure, nucleation of the ikaite crystals in the Bransfield Basin sediments may be induced by the high alkalinity, high phosphate concentrations, and dissolved organic compounds. Intense microbial metabolism generates such compounds; of these, aspartic acid and glutamic acid may play an important role, as they do in biological and extracellular carbonate mineral precipitation. All indications are that low temperatures (such as of polar environments), high calcium carbonate supersaturation caused by interstitial methanogenesis, and a sufficiently large supply of dissolved phosphate and amino acids favor metastable ikaite formation. These conditions, modified by recrystallization, may be preserved in calcite glendonites, thinolites, and other calcitic pseudomorphs derived from ikaite and found throughout the ancient sedimentary record." @default.
- W4313406430 created "2023-01-06" @default.
- W4313406430 creator A5029435954 @default.
- W4313406430 creator A5031820796 @default.
- W4313406430 creator A5033907060 @default.
- W4313406430 creator A5079376903 @default.
- W4313406430 date "2022-12-17" @default.
- W4313406430 modified "2023-10-03" @default.
- W4313406430 title "Calcium Carbonate Hexahydrate (Ikaite): History of Mineral Formation as Recorded by Stable Isotopes" @default.
- W4313406430 cites W1495921156 @default.
- W4313406430 cites W1501935855 @default.
- W4313406430 cites W1520240703 @default.
- W4313406430 cites W1550911434 @default.
- W4313406430 cites W1636324519 @default.
- W4313406430 cites W1917665359 @default.
- W4313406430 cites W1963905994 @default.
- W4313406430 cites W1965115120 @default.
- W4313406430 cites W1967542722 @default.
- W4313406430 cites W1969840431 @default.
- W4313406430 cites W1970658925 @default.
- W4313406430 cites W1972712141 @default.
- W4313406430 cites W1975392369 @default.
- W4313406430 cites W1976172506 @default.
- W4313406430 cites W1976185699 @default.
- W4313406430 cites W1976610216 @default.
- W4313406430 cites W1977581774 @default.
- W4313406430 cites W1979541447 @default.
- W4313406430 cites W1984093956 @default.
- W4313406430 cites W1984495452 @default.
- W4313406430 cites W1986601587 @default.
- W4313406430 cites W1987510283 @default.
- W4313406430 cites W1988857314 @default.
- W4313406430 cites W1990633912 @default.
- W4313406430 cites W1995230689 @default.
- W4313406430 cites W1996787486 @default.
- W4313406430 cites W1998677954 @default.
- W4313406430 cites W1999336701 @default.
- W4313406430 cites W2001266808 @default.
- W4313406430 cites W2008281306 @default.
- W4313406430 cites W2008903705 @default.
- W4313406430 cites W2009470097 @default.
- W4313406430 cites W2009866586 @default.
- W4313406430 cites W2009953299 @default.
- W4313406430 cites W2010156552 @default.
- W4313406430 cites W2014796857 @default.
- W4313406430 cites W2017913935 @default.
- W4313406430 cites W2019764231 @default.
- W4313406430 cites W2021856491 @default.
- W4313406430 cites W2022576274 @default.
- W4313406430 cites W2027657826 @default.
- W4313406430 cites W2027955042 @default.
- W4313406430 cites W2028485449 @default.
- W4313406430 cites W2029084631 @default.
- W4313406430 cites W2032854853 @default.
- W4313406430 cites W2033139996 @default.
- W4313406430 cites W2033443500 @default.
- W4313406430 cites W2035801874 @default.
- W4313406430 cites W2036807578 @default.
- W4313406430 cites W2042048458 @default.
- W4313406430 cites W2042073467 @default.
- W4313406430 cites W2043668123 @default.
- W4313406430 cites W2044460144 @default.
- W4313406430 cites W2047922774 @default.
- W4313406430 cites W2047954492 @default.
- W4313406430 cites W2048630319 @default.
- W4313406430 cites W2051295811 @default.
- W4313406430 cites W2063031611 @default.
- W4313406430 cites W2063700168 @default.
- W4313406430 cites W2064083382 @default.
- W4313406430 cites W2067251856 @default.
- W4313406430 cites W2068297501 @default.
- W4313406430 cites W2070683815 @default.
- W4313406430 cites W2071441336 @default.
- W4313406430 cites W2071475281 @default.
- W4313406430 cites W2075917363 @default.
- W4313406430 cites W2076196919 @default.
- W4313406430 cites W2077609525 @default.
- W4313406430 cites W2077849516 @default.
- W4313406430 cites W2079757306 @default.
- W4313406430 cites W2079915343 @default.
- W4313406430 cites W2082046004 @default.
- W4313406430 cites W2082422470 @default.
- W4313406430 cites W2086458539 @default.
- W4313406430 cites W2088478150 @default.
- W4313406430 cites W2091340198 @default.
- W4313406430 cites W2094082807 @default.
- W4313406430 cites W2094097453 @default.
- W4313406430 cites W2100634462 @default.
- W4313406430 cites W2105564343 @default.
- W4313406430 cites W2113427692 @default.
- W4313406430 cites W2115837766 @default.
- W4313406430 cites W2124482982 @default.
- W4313406430 cites W2124899716 @default.
- W4313406430 cites W2128138935 @default.
- W4313406430 cites W2142067912 @default.
- W4313406430 cites W2149362995 @default.
- W4313406430 cites W2155324135 @default.
- W4313406430 cites W2159407616 @default.