Calcium isotopes in planktonic foraminifera - core tops and sediment trap samples ...

• Main Authors: Griffith, Elizabeth M, Paytan, Adina, Kozdon, Reinhard, Eisenhauer, Anton, Ravelo, Ana Christina
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2016
• Subjects: Ocean Drilling Program ODP; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.858628; https://doi.pangaea.de/10.1594/PANGAEA.858628

For paleoceanographic studies, it is important to understand the processes that influence the calcium (Ca) isotopic composition of foraminiferal calcite tests preserved in the sediment record. Seven species of planktonic foraminifera from coretop sediments collectively exhibited a Ca temperature dependent fractionation of 0.013 per mil per °C. This is in agreement with previously published estimates for most species of planktonic foraminifera as well as biogenic and inorganic calcite and aragonite. Four species of planktonic foraminifera collected from a sediment trap showed a considerable amount of scatter and no consistent temperature dependent fractionation. Analyzed size fractions of coretop samples show no significant relationship with d44/40Ca. However, preliminary results suggest that the symbiotic and spinose foraminifera G. sacculifer might exhibit a relationship between test size and d44/40Ca. A one-box model in which Ca isotopes are allowed to fractionate by Rayleigh distillation from a ... : Supplement to: Griffith, Elizabeth M; Paytan, Adina; Kozdon, Reinhard; Eisenhauer, Anton; Ravelo, Ana Christina (2008): Influences on the fractionation of calcium isotopes in planktonic foraminifera. Earth and Planetary Science Letters, 268(1-2), 124-136 ...