Eve of biomineralization: Controls on skeletal mineralogyстатья

Статья опубликована в высокорейтинговом журнале

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Дата последнего поиска статьи во внешних источниках: 31 октября 2014 г.

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1. Zhuravlev_Wood_2008_eve_of_biomineralization.pdf Zhuravlev_Wood_2008_eve_of_biomineralization.pdf 167,6 КБ 24 октября 2014 [AYZhuravlev]

[1] Zhuravlev A. Y., Wood R. A. Eve of biomineralization: Controls on skeletal mineralogy // Geology. — 2008. — Vol. 36, no. 12. — P. 923–926. Carbonate mineralogies have oscillated between aragonite and calcite seas through geological time, proposed to be due mainly to secular variation in the magnesium/calcium ratio driven by changing rates of ocean crust production. A quantitative compilation of inorganic and biominerals from the onset of biomineralization (late Ediacaran–Middle Ordovician) reveals a correspondence between seawater chemistry and the first adopted mineralogy of skeletal clades. Ediacaran–Tommotian skeletons and inorganic precipitates were composed exclusively of aragonite or high-Mg calcite, but these were replaced by low-Mg calcite min- eralogies during the early Atdabanian, implying the onset of a calcite sea. This transition is empirically constrained by fluid inclusion data. Late Atbadanian–Botoman inorganic pre- cipitates returned to aragonite, with high-Mg calcite echinoderms and solitary tabulaconids and massive aragonitic tabulaconids originating during this interval. Middle Cambrian– Ordovician inorganic precipitates were low-Mg calcite, and the Ordovician radiation in skel- etal expression was due mostly to groups with low-Mg calcite mineralogies. These short-lived transitions can be most parsimoniously explained by minor oscillations of mMg:Ca around ∼2 during this period, possibly combined with the progressive onset of greenhouse conditions during the mid-Late Cambrian. [ DOI ]

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