Temperature Impact on Magnesium Isotope Fractionation in Cultured Foraminifera
نویسندگان
چکیده
Element incorporation in shell calcite precipitated by foraminifera reflects the chemical and physical properties of seawater lived can therefore be used to reconstruct paleo environmental conditions. One most prominent proxies for past temperature is Mg/Ca foraminiferal calcite. Still, addition temperature, also biomineralization processes impact values. As plays a major role not necessarily constant, it imperative identify mechanism which Mg incorporated thereby understand how influences incorporation. Biomineralization discriminating against different degrees hence investigating fractionation isotopes at temperatures species with contrasting calcification pathways better pathway during biomineralization. Overall, we observe that higher content have δ 26 values closer those seawater. Moreover, controlled culture experiments show parallel an increase Mg/Ca, tests large benthic foraminifer Amphistegina lessonii decreases when sea water increase. This negative correlation between suggests two-step control on Using simple model, explain both trends as result stable pool, only little fractionated respect dependent pool shows The stable, much relatively high foraminifera, whereas low transport over cell membrane probably results observed inverse correlation. Here present model using isotope established A. general high- low-Mg/Ca foraminifera. A process-based understanding remains crucial robust interpretation Mg-isotopes.
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ژورنال
عنوان ژورنال: Frontiers in Earth Science
سال: 2021
ISSN: ['2296-6463']
DOI: https://doi.org/10.3389/feart.2021.642256