Investigating the effects of growth rate and temperature on the B/Ca ratio and δ11B during inorganic calcite formation


Contact
Karina.Kaczmarek [ at ] awi.de

Abstract

To deconvolve the effect of growth rate and temperature on the boron partitioning into calcite and its isotope fractionation, seeded calcite precipitation experiments were performed at a constant temperature and various growth rates and at a constant growth rate and various temperatures. We show that boron partitioning increases with increasing growth rate and decreases with increasing temperature. The B isotope fractionation between calcite and B(OH)4− increases with increasing growth rate favoring the lighter B isotope for incorporation into calcite whereas no effect of temperature was observed within the temperature range investigated (12 °C to 32 °C). At the lowest temperature and growth rate δ11B of the calcite almost equals that of B(OH)4− in solution. Applying the surface entrapment model (SEMO) of Watson and Liang (1995) to our data, we demonstrate that the observed effects of temperature and growth rate on B concentration can be explained by processes in the near surface layer of the calcite crystal.



Item Type
Article
Authors
Divisions
Primary Division
Programs
Primary Topic
Peer revision
ISI/Scopus peer-reviewed
Publication Status
Published
Eprint ID
39336
DOI 10.1016/j.chemgeo.2015.12.002

Cite as
Kaczmarek, K. , Nehrke, G. , Misra, S. , Bijma, J. and Elderfield, H. (2016): Investigating the effects of growth rate and temperature on the B/Ca ratio and δ11B during inorganic calcite formation , Chemical Geology, 421 , pp. 81-92 . doi: 10.1016/j.chemgeo.2015.12.002


Download
[img]
Preview
PDF
Karina_2016.pdf

Download (836kB) | Preview
Cite this document as:

Share


Citation

Research Platforms
N/A

Campaigns


Actions
Edit Item Edit Item