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- Calcite_sea abstract "A calcite sea is one in which low-magnesium calcite is the primary inorganic marine calcium carbonate precipitate. An aragonite sea is the alternate seawater chemistry in which aragonite and high-magnesium calcite are the primary inorganic carbonate precipitates. The Early Paleozoic and the Middle to Late Mesozoic oceans were predominantly calcite seas, whereas the Middle Paleozoic through the Early Mesozoic and the Cenozoic (including today) are characterized by aragonite seas (Wilkinson et al., 1985; Wilkinson and Given, 1986; Morse and Mackenzie, 1990; Lowenstein et al., 2001; Palmer and Wilson, 2004).The most significant geological and biological effects of calcite sea conditions include rapid and widespread formation of carbonate hardgrounds (Palmer, 1982; Palmer et al., 1988; Wilson and Palmer, 1992), calcitic ooids (Sandberg, 1983; Wilkinson et al., 1985), calcite cements (Wilkinson and Given, 1986), and the contemporaneous dissolution of aragonite shells in shallow warm seas (Cherns and Wright, 2000; Palmer and Wilson, 2004). Hardgrounds were very common, for example, in the calcite seas of the Ordovician and Jurassic, but virtually absent from the aragonite seas of the Permian (Palmer, 1982).Fossils of invertebrate organisms found in calcite sea deposits are usually dominated by either thick calcite shells and skeletons (Wilkinson, 1979; Stanley and Hardie, 1998, 1999; Porter, 2007), were infaunal and/or had thick periostraca (Pojeta, 1971), or had an inner shell of aragonite and an outer shell of calcite (Harper et al., 1997). This was apparently because aragonite dissolved quickly on the seafloor and had to be either avoided or protected as a biomineral (Palmer and Wilson, 2004).Calcite seas were coincident with times of rapid seafloor spreading and global greenhouse climate conditions (Stanley and Hardie, 1999). Seafloor spreading centers cycle seawater through hydrothermal vents, reducing the ratio of magnesium to calcium in the seawater through metamorphism of calcium-rich minerals in basalt to magnesium-rich clays (Wilkinson and Given, 1986; Lowenstein et al., 2001). This reduction in the Mg/Ca ratio favors the precipitation of calcite over aragonite. Increased seafloor spreading also means increased volcanism and elevated levels of carbon dioxide in the atmosphere and oceans. This may also have an effect on which polymorph of calcium carbonate is precipitated (Lowenstein et al., 2001). Further, high calcium concentrations of seawater favor the burial of CaCO3, thereby removing alkalinity from the ocean, lowering seawater pH and reducing its acid/base buffering.".
- Calcite_sea thumbnail CalciteAragonite.jpg?width=300.
- Calcite_sea wikiPageExternalLink PalmerWilson05.pdf.
- Calcite_sea wikiPageID "14896670".
- Calcite_sea wikiPageLength "9420".
- Calcite_sea wikiPageOutDegree "39".
- Calcite_sea wikiPageRevisionID "682887468".
- Calcite_sea wikiPageWikiLink Alkalinity.
- Calcite_sea wikiPageWikiLink Aragonite.
- Calcite_sea wikiPageWikiLink Aragonite_sea.
- Calcite_sea wikiPageWikiLink Bivalve.
- Calcite_sea wikiPageWikiLink Bivalvia.
- Calcite_sea wikiPageWikiLink Calcite.
- Calcite_sea wikiPageWikiLink Calcium_carbonate.
- Calcite_sea wikiPageWikiLink Carbon_dioxide.
- Calcite_sea wikiPageWikiLink Carbonate_hardgrounds.
- Calcite_sea wikiPageWikiLink Category:Historical_geology.
- Calcite_sea wikiPageWikiLink Category:Limestone.
- Calcite_sea wikiPageWikiLink Category:Marine_geology.
- Calcite_sea wikiPageWikiLink Cenozoic.
- Calcite_sea wikiPageWikiLink Echinosphaerites.
- Calcite_sea wikiPageWikiLink Fossil.
- Calcite_sea wikiPageWikiLink Fossils.
- Calcite_sea wikiPageWikiLink Hardground.
- Calcite_sea wikiPageWikiLink Hydrothermal_vent.
- Calcite_sea wikiPageWikiLink Invertebrate.
- Calcite_sea wikiPageWikiLink Jurassic.
- Calcite_sea wikiPageWikiLink Mesozoic.
- Calcite_sea wikiPageWikiLink Metamorphism.
- Calcite_sea wikiPageWikiLink Nautiloid.
- Calcite_sea wikiPageWikiLink Ooid.
- Calcite_sea wikiPageWikiLink Ooids.
- Calcite_sea wikiPageWikiLink Ordovician.
- Calcite_sea wikiPageWikiLink Paleozoic.
- Calcite_sea wikiPageWikiLink Permian.
- Calcite_sea wikiPageWikiLink Petroxestes.
- Calcite_sea wikiPageWikiLink Seafloor_spreading.
- Calcite_sea wikiPageWikiLink Tectonic.
- Calcite_sea wikiPageWikiLink Tectonics.
- Calcite_sea wikiPageWikiLink Volcanism.
- Calcite_sea wikiPageWikiLink File:CalciteAragonite.jpg.
- Calcite_sea wikiPageWikiLink File:CarmelHdgd.jpg.
- Calcite_sea wikiPageWikiLinkText "Calcite sea".
- Calcite_sea wikiPageWikiLinkText "calcite sea".
- Calcite_sea hasPhotoCollection Calcite_sea.
- Calcite_sea wikiPageUsesTemplate Template:Cite_journal.
- Calcite_sea wikiPageUsesTemplate Template:Reflist.
- Calcite_sea subject Category:Historical_geology.
- Calcite_sea subject Category:Limestone.
- Calcite_sea subject Category:Marine_geology.
- Calcite_sea hypernym Precipitate.
- Calcite_sea type Subfield.
- Calcite_sea comment "A calcite sea is one in which low-magnesium calcite is the primary inorganic marine calcium carbonate precipitate. An aragonite sea is the alternate seawater chemistry in which aragonite and high-magnesium calcite are the primary inorganic carbonate precipitates.".
- Calcite_sea label "Calcite sea".
- Calcite_sea sameAs m.03h0vyz.
- Calcite_sea sameAs Q5018792.
- Calcite_sea sameAs Q5018792.
- Calcite_sea wasDerivedFrom Calcite_sea?oldid=682887468.
- Calcite_sea depiction CalciteAragonite.jpg.
- Calcite_sea isPrimaryTopicOf Calcite_sea.